CN218094221U

CN218094221U - Three-stage dry gas sealing structure of high-pressure compressor of hydropower station

Info

Publication number: CN218094221U
Application number: CN202222578108.1U
Authority: CN
Inventors: 熊亮; 张振; 谢娟芳; 赵勇
Original assignee: Sinohydro Bureau 5 Co Ltd
Current assignee: Sinohydro Bureau 5 Co Ltd
Priority date: 2022-09-28
Filing date: 2022-09-28
Publication date: 2022-12-20
Anticipated expiration: 2032-09-28

Abstract

The utility model discloses a power station high pressure compressor's tertiary formula dry gas seal structure, seal structure sets up in rotatory pivot, seal structure includes: bearing housing, outer seal shell, one-level dry gas seal assembly, second grade dry gas seal assembly and tertiary dry gas seal assembly, the fixed suit of bearing housing is in the rotatory pivot, the both ends of outer seal shell with the both ends dynamic seal of bearing housing is connected, outer seal shell with set up to sealed chamber between the bearing housing, the one-level dry gas seal assembly the second grade dry gas seal assembly with tertiary dry gas seal assembly establishes ties in proper order and sets up sealed intracavity. The utility model discloses a through the dry gas seal assembly who sets up three series connection to even make one of them or two seal assembly break down, whole dry gas seal structure still can normal work.

Description

Three-stage dry gas sealing structure of high-pressure compressor of hydropower station

Technical Field

The utility model relates to a hydraulic and hydroelectric engineering technical field, concretely relates to power station high pressure compressor's tertiary formula dry gas seal structure.

Background

The main application of the high-pressure air compressor in the hydropower station is to supplement high-pressure air to a speed regulator oil pressing device; inflating and supplementing air in an air cushion chamber of the hydropower station air cushion type surge chamber; switching gas source of high-pressure switch, etc

At the present stage, a sealing method for an air compressor generally adopts floating ring sealing, so that the heat generated in the high-speed operation of the sealing is reduced; the sealing pressure is higher than the medium pressure, so that the process medium is prevented from leaking to the environment.

However, the floating ring seal has high precision requirement on machining parts, large leakage amount and complex sealing oil control system, a special sealing oil pump and a sealing oil pressure control system are required, the pressure control requirement on sealing oil is strict, and once process fluctuation occurs, a large amount of sealing oil is easily leaked into the cylinder body of the compressor, so that the running performance of the compressor is greatly influenced, the process is damaged, and even the compressor is stopped and overhauled.

Therefore, dry gas sealing is adopted in many cases at present, but in production operation, most of dry gas sealing devices adopt single-stage sealing, namely a static ring and a movable ring are matched, and the dry gas sealing device is frequently subjected to leakage occurrence due to failure in use.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problem that the floating ring seal structure is complicated, the easy problem of revealing of monopole dry gas seal, aim at provides a power station high pressure compressor's tertiary formula dry gas seal structure.

A three-stage dry gas seal structure of a high-pressure compressor of a hydropower station, the seal structure being arranged on a rotating shaft, the seal structure comprising: bearing housing, outer seal shell, one-level dry gas seal assembly, second grade dry gas seal assembly and tertiary dry gas seal assembly, the fixed suit of bearing housing is in the rotatory pivot, the both ends of outer seal shell with the both ends dynamic seal of bearing housing is connected, outer seal shell with set up to sealed chamber between the bearing housing, the one-level dry gas seal assembly the second grade dry gas seal assembly with tertiary dry gas seal assembly establishes ties in proper order and sets up sealed intracavity.

Preferably, the bearing sleeve is of a cylindrical structure, and the inner side surface of the bearing sleeve is fixedly connected with the outer side surface of the rotating shaft in a sealing manner;

the outer sealing shell comprises a first circular ring, a second circular ring and a straight cylinder, the first circular ring, the second circular ring and the straight cylinder are coaxially arranged, the outer annular surface of the first circular ring is fixedly and hermetically connected with the first end of the straight cylinder, the outer annular surface of the second circular ring is fixedly and hermetically connected with the second end of the straight cylinder, and the inner annular surface of the first circular ring and the inner annular surface of the second circular ring are respectively and movably and hermetically connected with the bearing sleeve.

Specifically, one end of the sealing structure is set as the left side, and the other end of the sealing structure is set as the right side;

the primary dry gas sealing assembly comprises a primary fixed ring, a primary movable ring, a primary static ring supporting seat and a primary elastic assembly, the primary fixed ring is sleeved on the bearing sleeve, the inner ring surface of the primary fixed ring is fixedly connected with the outer side surface of the bearing sleeve, the left side surface of the primary movable ring is fixedly connected with the right side surface of the primary fixed ring, the primary static ring is arranged on the right side of the primary movable ring, the primary static ring supporting seat is arranged on the right side of the primary static ring, the right side surface of the primary static ring is connected with the left side surface of the primary static ring supporting seat through the primary elastic assembly, and the outer ring surface of the primary static ring supporting seat is fixedly connected with the inner side surface of the outer sealing shell;

the secondary dry gas sealing assembly comprises a secondary fixing ring, a secondary moving ring, a secondary static ring supporting seat and a secondary elastic assembly, the secondary fixing ring is sleeved on the bearing sleeve, the inner ring surface of the secondary fixing ring is fixedly connected with the outer side surface of the bearing sleeve, the left side surface of the secondary moving ring is fixedly connected with the right side surface of the secondary fixing ring, the secondary static ring is arranged on the right side of the secondary moving ring, the secondary static ring supporting seat is arranged on the right side of the secondary static ring, the right side surface of the secondary static ring is connected with the left side surface of the secondary static ring supporting seat through the secondary elastic assembly, and the outer ring surface of the secondary static ring supporting seat is fixedly connected with the inner side surface of the outer sealing shell;

the three-level dry gas sealing assembly comprises a three-level fixing ring, a three-level moving ring, a three-level static ring supporting seat and a three-level elastic assembly, the three-level fixing ring is sleeved on the bearing sleeve, the inner ring surface of the three-level fixing ring is fixedly connected with the outer side surface of the bearing sleeve, the left side surface of the three-level moving ring is fixedly connected with the right side surface of the three-level fixing ring, the three-level static ring is arranged on the right side of the three-level moving ring, the three-level static ring supporting seat is arranged on the right side of the three-level static ring, the right side surface of the three-level static ring is connected with the left side surface of the three-level static ring supporting seat through the three-level elastic assembly, and the outer ring surface of the three-level static ring supporting seat is fixedly connected with the inner side surface of the outer sealing shell.

Specifically, the right side surface of the primary moving ring, the right side surface of the secondary moving ring and the right side surface of the tertiary moving ring are provided with dynamic pressure grooves for dry gas sealing.

Specifically, the primary elastic assembly comprises a primary spring and a primary push ring, a primary annular groove is formed in the left side face of the primary static ring support seat, a plurality of primary springs are horizontally arranged in the primary annular groove, the right end of each primary spring is vertically and fixedly connected with the bottom face of the corresponding primary annular groove, the primary push ring is arranged between the primary static ring and the corresponding primary static ring support seat, the right side face of the primary push ring is vertically and fixedly connected with the left end of the corresponding primary spring, and the left side face of the primary push ring is attached to the right side face of the corresponding primary static ring;

the secondary elastic component comprises a secondary spring and a secondary push ring, a secondary annular groove is formed in the left side face of the secondary static ring supporting seat, a plurality of secondary springs are horizontally arranged in the secondary annular groove, the right end of each secondary spring is vertically and fixedly connected with the bottom face of the secondary annular groove, the secondary push ring is arranged between the secondary static ring and the secondary static ring supporting seat, the right side face of the secondary push ring is vertically and fixedly connected with the left end of the secondary spring, and the left side face of the secondary push ring is attached to the right side face of the secondary static ring;

tertiary elastic component includes tertiary spring and tertiary throw ring, the left surface of tertiary quiet ring supporting seat is provided with tertiary ring channel, and is a plurality of tertiary spring level sets up in the tertiary ring channel, the right-hand member of tertiary spring with the perpendicular fixed connection in bottom surface of tertiary ring channel, tertiary throw ring sets up tertiary quiet ring with between the tertiary quiet ring supporting seat, just the right flank of tertiary throw ring with the perpendicular fixed connection in left end of tertiary spring, the left surface of tertiary throw ring with the right flank laminating of tertiary quiet ring.

Further, a first-stage support ring is arranged on the left side surface of the first-stage static ring support seat, a second-stage support ring is arranged on the left side surface of the second-stage static ring support seat, a third-stage support ring is arranged on the left side surface of the third-stage static ring support seat, and the first-stage support ring, the second-stage support ring and the third-stage support ring are all coaxially arranged with the bearing sleeve;

the external diameter of one-level support ring equals the internal diameter of one-level quiet ring, the external diameter of second grade support ring equals the internal diameter of second grade quiet ring, the external diameter of tertiary support ring equals the internal diameter of tertiary quiet ring, the internal diameter of one-level support ring the internal diameter of second grade support ring with the internal diameter of tertiary support ring is all not less than the external diameter of bearing housing.

Specifically, a primary air inlet communicated with the primary dry air sealing assembly is formed in the outer sealing shell, a secondary air inlet communicated with the secondary dry air sealing assembly is formed in the outer sealing shell, and a tertiary air inlet communicated with the tertiary dry air sealing assembly is formed in the outer sealing shell;

the sealing structure further comprises an air inlet ring, the air inlet ring is sleeved on the outer sealing shell, an air inlet cavity is formed in the inner side face of the air inlet ring, the first-stage air inlet, the second-stage air inlet and the third-stage air inlet are communicated with the air inlet cavity, and a main air inlet communicated with the air inlet cavity is formed in the outer side face of the air inlet ring.

Furthermore, the sealing structure further comprises a first-stage labyrinth seal assembly and a second-stage labyrinth seal assembly, the first-stage labyrinth seal assembly is arranged between the first-stage dry gas seal assembly and the second-stage dry gas seal assembly, and the second-stage labyrinth seal assembly is arranged between the second-stage dry gas seal assembly and the third-stage dry gas seal assembly.

Specifically, the primary labyrinth seal assembly comprises a primary mounting cylinder and a primary labyrinth ring, wherein a plurality of primary annular deep grooves are formed in the inner annular surface of the primary stationary ring, the primary mounting cylinder is sleeved on the bearing sleeve, the inner side surface of the primary mounting cylinder is fixedly connected with the outer side surface of the bearing sleeve, the inner annular surfaces of the plurality of primary labyrinth rings are fixedly connected with the outer side surface of the primary mounting cylinder, and the plurality of primary labyrinth rings are respectively arranged in the plurality of primary annular deep grooves;

second grade labyrinth seal subassembly includes second grade installation section of thick bamboo and second grade labyrinth ring, the interior anchor ring of second grade quiet ring is provided with a plurality of second grade annular deep grooves, second grade installation section of thick bamboo suit is in on the bearing housing, just the medial surface of second grade installation section of thick bamboo with the lateral surface fixed connection of bearing housing, it is a plurality of the interior anchor ring of second grade labyrinth ring with the lateral surface fixed connection of second grade installation section of thick bamboo, it is a plurality of the second grade labyrinth ring sets up respectively in a plurality of the second grade annular deep groove.

Preferably, the width of the first-stage annular deep groove is greater than the thickness of the first-stage labyrinth ring, the diameter of the first-stage annular deep groove is greater than the outer diameter of the first-stage labyrinth ring, the width of the second-stage annular deep groove is greater than the thickness of the second-stage labyrinth ring, and the diameter of the second-stage annular deep groove is greater than the outer diameter of the second-stage labyrinth ring.

Compared with the prior art, the utility model discloses a set up the dry gas seal assembly of three series connection to even make one of them or two seal assembly break down, whole dry gas seal structure still can normal work.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the principles of the invention.

Fig. 1 is a schematic structural diagram of a three-stage dry gas sealing structure of a high-pressure compressor of a hydropower station according to the utility model.

Fig. 2 is a partially enlarged schematic view of the primary dry gas seal assembly according to the present invention.

Fig. 3 is a partially enlarged schematic view of a three-stage dry gas seal assembly according to the present invention.

Reference numerals: 1-rotating shaft, 2-bearing sleeve, 3-outer sealing shell, 4-air inlet ring, 5-main air inlet, 11-first fixed ring, 12-first movable ring, 13-first static ring, 14-first static ring support, 15-first elastic component, 16-first support ring, 17-first air inlet, 21-second fixed ring, 22-second movable ring, 23-second static ring, 24-second static ring support, 25-second elastic component, 26-second support ring, 27-second air inlet, 31-third fixed ring, 32-third movable ring, 33-third static ring, 34-third static ring support, 35-third elastic component, 36-third support ring, 37-third air inlet.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant disclosure and are not to be considered as limiting the invention.

It should be noted that, for the convenience of description, only the parts related to the present invention are shown in the drawings.

In the case of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail with reference to the accompanying drawings in conjunction with embodiments.

The utility model provides a power station high pressure compressor's tertiary formula dry gas seal structure, dry gas seal structure sets up on rotatory pivot 1, and dry gas seal structure includes: bearing housing 2, external seal shell 3, the dry gas seal assembly of one-level, the dry gas seal assembly of second grade and tertiary dry gas seal assembly, bearing housing 2 fixed suit is on rotatory pivot 1, and the both ends of external seal shell 3 are connected with the both ends movive seal of bearing housing 2, sets up to sealed chamber between external seal shell 3 and the bearing housing 2, and the dry gas seal assembly of one-level, the dry gas seal assembly of second grade and tertiary dry gas seal assembly set gradually the series connection and set up in sealed chamber.

With bearing housing 2 suit to rotatory pivot 1 on, wherein the connected mode of bearing housing 2 and rotatory pivot 1 can be for a wide variety, do not do specific restriction, as long as the medial surface of bearing housing 2 can with the sealed fixed connection of the lateral surface of rotatory pivot 1 can, for example: the positioning ring is clamped with the positioning groove; through the matching of the pin and the pin hole; by clasping of a clamp, etc.

Bearing housing 2 and outer seal shell 3 constitute the seal chamber, and outer seal shell 3 and bearing housing 2 take place relative rotation, and bearing housing 2 does not rotate for rotatory pivot 1 promptly, and outer seal shell 3 rotates for rotatory pivot 1, because of need the dynamic seal to be connected between 3 bodies of outer seal shell and the bearing housing 2, the common dynamic seal connected mode in present stage is that carbon brush is sealed, the broach is sealed etc..

One-level dry gas seal assembly, second grade dry gas seal assembly and tertiary dry gas seal assembly all set up at sealed intracavity, and three dry gas seal assembly is as long as there is a normal work, the condition of revealing all can not appear, consequently can effectually reduce the fault rate.

The bearing sleeve 2 is of a cylindrical structure, and the inner side surface of the bearing sleeve 2 is fixedly connected with the outer side surface of the rotating shaft 1 in a sealing way;

the outer sealing shell 3 comprises a first circular ring, a second circular ring and a straight cylinder, the first circular ring, the second circular ring and the straight cylinder are coaxially arranged, the outer circular surface of the first circular ring is fixedly and hermetically connected with the first end of the straight cylinder, the outer circular surface of the second circular ring is fixedly and hermetically connected with the second end of the straight cylinder, and the inner circular surface of the first circular ring and the inner circular surface of the second circular ring are respectively and movably and hermetically connected with the bearing sleeve 2.

The outer sealing shell 3 may be an integrally formed structure, and in this embodiment, it is divided into three parts, which is for convenience of description, and in practice, it may be directly cast; or may be welded.

The inner ring surface of the first ring and the inner ring surface of the second ring are sealed through the carbon brush seal, the comb seal and other existing-stage contact type sealing devices.

For convenience of description, the orientation is set, that is, according to the orientation in the drawing, the side where the first ring is located is set as the left side of the whole member, and the side where the second ring is located is set as the right side of the whole member.

As shown in fig. 1, fig. 2 and fig. 3, the primary dry gas sealing assembly includes a primary fixed ring 11, a primary moving ring 12, a primary stationary ring 13, a primary stationary ring support seat 14 and a primary elastic assembly 15, the primary fixed ring 11 is sleeved on the bearing sleeve 2, an inner ring surface of the primary fixed ring 11 is fixedly connected with an outer side surface of the bearing sleeve 2, a left side surface of the primary moving ring 12 is fixedly connected with a right side surface of the primary fixed ring 11, the primary stationary ring 13 is disposed on the right side of the primary moving ring 12, the primary stationary ring support seat 14 is disposed on the right side of the primary stationary ring 13, a right side surface of the primary stationary ring 13 is connected with a left side surface of the primary stationary ring support seat 14 through the primary elastic assembly 15, and an outer ring surface of the primary stationary ring support seat 14 is fixedly connected with an inner side surface of the outer sealing shell 3;

the second-stage dry gas sealing assembly comprises a second-stage fixed ring 21, a second-stage moving ring 22, a second-stage static ring 23, a second-stage static ring supporting seat 24 and a second-stage elastic assembly 25, the second-stage fixed ring 21 is sleeved on the bearing sleeve 2, the inner ring surface of the second-stage fixed ring 21 is fixedly connected with the outer side surface of the bearing sleeve 2, the left side surface of the second-stage moving ring 22 is fixedly connected with the right side surface of the second-stage fixed ring 21, the second-stage static ring 23 is arranged on the right side of the second-stage moving ring 22, the second-stage static ring supporting seat 24 is arranged on the right side of the second-stage static ring 23, the right side surface of the second-stage static ring 23 is connected with the left side surface of the second-stage static ring supporting seat 24 through the second-stage elastic assembly 25, and the outer ring surface of the second-stage static ring supporting seat 24 is fixedly connected with the inner side surface of the outer sealing shell 3;

tertiary dry gas seal assembly includes three-level solid fixed ring 31, three-level rotating ring 32, three-level quiet ring 33, three-level quiet ring supporting seat 34 and tertiary elastic component 35, three-level solid fixed ring 31 suit is on bearing housing 2, and three-level solid fixed ring 31's interior anchor ring and bearing housing 2's lateral surface fixed connection, three-level rotating ring 32's the left surface and three-level solid fixed ring 31's right flank fixed connection, three-level quiet ring 33 sets up the right side at three-level rotating ring 32, three-level quiet ring supporting seat 34 sets up the right side at three-level quiet ring 33, be connected through three-level elastic component 35 between three-level quiet ring 33's the right flank and three-level quiet ring supporting seat 34's the left surface, three-level quiet ring supporting seat 34's outer anchor ring face and outer seal shell 3's medial surface fixed connection.

The right side surface of the first-stage moving ring 12, the right side surface of the second-stage moving ring 22 and the right side surface of the third-stage moving ring 32 are provided with dynamic pressure grooves for dry air sealing, the common dynamic pressure grooves for dry air sealing have a single rotation direction and a double rotation direction, the common single rotation direction is a spiral groove, and the double rotation direction is a T-shaped groove, a fir groove and a U-shaped groove.

The working principle is explained by taking a primary dry gas sealing assembly as an example.

One-level rotating ring 12 follows rotation shaft 1 and rotates, and gas injection to dry gas seal moves the pressure inslot, and gas receives the extrusion in dry gas seal moves the pressure inslot, moves the gas pressure and exerts a right effort to one-level quiet ring 13, and one-level elastic component 15 exerts a effort left to one-level quiet ring 13, when two efforts are balanced, realizes that dry gas seals.

The working principle is based on the balance among hydrostatic pressure, elastic force and hydrodynamic pressure. When the sealing gas is injected into the first sealing cavity, the primary moving ring 12 and the primary static ring 13 are subjected to the action of hydrostatic pressure.

When the first-stage moving ring 12 rotates along with the rotating shaft 1, the gas in the dry gas sealing dynamic pressure groove is cut to flow from the outer edge to the center to generate dynamic pressure, the sealing weir has the function of inhibiting the outflow of the gas, so that the gas flow is blocked, the gas pressure is increased, the increased pressure separates the flexibly mounted first-stage static ring 13 from the matched first-stage moving ring 12, when the gas pressure and the first-stage elastic component 15 are restored to be balanced, a minimum gap is maintained to form a gas film, the film thickness is generally 3-5 mu m, the first-stage moving ring 12 and the first-stage static ring 13 are separated from contact, and therefore the end face is almost free of abrasion, and meanwhile, the process gas is sealed.

The working principle of the second-stage dry gas sealing assembly and the third-stage dry gas sealing assembly is similar to that of the first-stage dry gas sealing assembly, and the details are not repeated here.

The primary, secondary and tertiary

elastic modules

15, 25, 35 may be identical or different in construction, and two specific examples are provided below to illustrate the construction of the elastic modules.

The primary elastic assembly 15 comprises a primary spring and a primary push ring, a primary annular groove is formed in the left side face of the primary static ring supporting seat 14, a plurality of primary springs are horizontally arranged in the primary annular groove, the right end of each primary spring is vertically and fixedly connected with the bottom face of the corresponding primary annular groove, the primary push ring is arranged between the primary static ring 13 and the corresponding primary static ring supporting seat 14, the right side face of the primary push ring is vertically and fixedly connected with the left end of the corresponding primary spring, and the left side face of the primary push ring is attached to the right side face of the corresponding primary static ring 13;

the secondary elastic component 25 comprises a secondary spring and a secondary push ring, a secondary annular groove is formed in the left side face of the secondary static ring supporting seat 24, a plurality of secondary springs are horizontally arranged in the secondary annular groove, the right end of each secondary spring is vertically and fixedly connected with the bottom face of the secondary annular groove, the secondary push ring is arranged between the secondary static ring 23 and the secondary static ring supporting seat 24, the right side face of the secondary push ring is vertically and fixedly connected with the left end of the secondary spring, and the left side face of the secondary push ring is attached to the right side face of the secondary static ring 23;

tertiary elastic component 35 includes tertiary spring and tertiary throw-out collar, and the left surface of tertiary quiet ring supporting seat 34 is provided with tertiary ring channel, and a plurality of tertiary spring levels set up in tertiary ring channel, the right-hand member of tertiary spring and the perpendicular fixed connection in bottom surface of tertiary ring channel, and tertiary throw-out collar setting is between tertiary quiet ring 33 and tertiary quiet ring supporting seat 34, and the right flank of tertiary throw-out collar and the perpendicular fixed connection in left end of tertiary spring, and the left surface of tertiary throw-out collar is laminated with the right flank of tertiary quiet ring 33.

The structure of the elastic assembly here comprises a spring and a push ring, and the primary elastic assembly 15 is used for the purpose of illustrating its working principle:

the function of the first-stage push ring can be that an auxiliary element is added between the first-stage spring and the first-stage static ring 13, and the push ring can be cancelled according to requirements, so that the first-stage spring and the first-stage static ring 13 are directly and fixedly connected.

One-level spring exerts an effort leftwards to one-level quiet ring 13 for when one-level rotating ring 12 does not rotate, one-level quiet ring 13 and one-level rotating ring 12 laminating, when one-level rotating ring 12 rotated, the fluid pressure that moves that one-level rotating ring 12 produced offset with the elasticity of one-level spring, thereby made gas pressure and one-level elastic component 15 balanced, maintained a minimum clearance, formed the gas film.

The working principle of the second-stage elastic element 25 and the third-stage elastic element 35 is the same, and is not described in detail.

Another embodiment is provided below, in which the spring can be replaced by an elastic rubber ring or a pneumatic telescopic rod.

The elastic rubber ring also has elasticity to a certain extent, can be filled in the first-stage annular groove and the second-stage annular groove, and realizes the effect of changing the elasticity by compressing the elastic rubber ring.

The air in the air pressure telescopic link can be compressed, and through changing the air quantity in the air pressure telescopic link, can be better carry out the equal proportion adaptation with the air in the dry air seal dynamic pressure groove, the distance between quiet ring and the rotating ring of control that can be better.

The left side surface of the first-stage static ring supporting seat 14 is provided with a first-stage supporting ring 16, the left side surface of the second-stage static ring supporting seat 24 is provided with a second-stage supporting ring 26, the left side surface of the third-stage static ring supporting seat 34 is provided with a third-stage supporting ring 36, and the first-stage supporting ring 16, the second-stage supporting ring 26 and the third-stage supporting ring 36 are all arranged coaxially with the bearing sleeve 2;

the outer diameter of the first-stage support ring 16 is equal to the inner diameter of the first-stage static ring 13, the outer diameter of the second-stage support ring 26 is equal to the inner diameter of the second-stage static ring 23, the outer diameter of the third-stage support ring 36 is equal to the inner diameter of the third-stage static ring 33, and the inner diameters of the first-stage support ring 16, the second-stage support ring 26 and the third-stage support ring 36 are not smaller than the outer diameter of the bearing sleeve 2.

The first-stage support ring 16, the second-stage support ring 26 and the third-stage support ring 36 can provide a guiding function for the first-stage static ring 13, the second-stage static ring 23 and the third-stage static ring 33 when moving along the axial direction, so that the static rings can move more stably, and the situation that the static rings are not coaxial with the rotating shaft 1 is avoided.

Specifically, a primary air inlet 17 communicated with a primary dry air sealing assembly is formed in the outer sealing shell 3, a secondary air inlet 27 communicated with a secondary dry air sealing assembly is formed in the outer sealing shell 3, and a tertiary air inlet 37 communicated with a tertiary dry air sealing assembly is formed in the outer sealing shell 3;

the primary air inlet 17, the secondary air inlet 27 and the tertiary air inlet 37 are used for supplying air to the dry air sealing dynamic pressure groove of the primary moving ring 12, the secondary moving ring 22 and the tertiary moving ring 32, and the common air is helium or other air.

The dry gas sealing structure further comprises a gas inlet ring 4, the gas inlet ring 4 is sleeved on the outer sealing shell 3, a gas inlet cavity is formed in the inner side face of the gas inlet ring 4, the first-stage gas inlet 17, the second-stage gas inlet 27 and the third-stage gas inlet 37 are communicated with the gas inlet cavity, and a main gas inlet 5 communicated with the gas inlet cavity is formed in the outer side face of the gas inlet ring 4.

Even if the air inlet ring 4 is not provided, the primary air inlet 17, the secondary air inlet 27 and the tertiary air inlet 37 can be respectively ventilated, but in order to reduce the number of air pipes, a uniform air port is arranged on a dry air sealing device, which is beneficial to the purpose of reducing the number of air pipes.

The trachea pours into gas into the air inlet chamber, and the air inlet chamber is connected with three air inlet, realizes the air feed to one-level dry gas seal assembly, second grade dry gas seal assembly and tertiary dry gas seal assembly.

The dry gas sealing structure further comprises a first-stage labyrinth seal assembly and a second-stage labyrinth seal assembly, the first-stage labyrinth seal assembly is arranged between the first-stage dry gas seal assembly and the second-stage dry gas seal assembly, and the second-stage labyrinth seal assembly is arranged between the second-stage dry gas seal assembly and the third-stage dry gas seal assembly.

Set for one-level dry gas seal subassembly and second grade seal subassembly into relatively independent state through setting up one-level labyrinth seal subassembly, set for second grade dry gas seal subassembly and tertiary dry gas seal subassembly into relatively independent state through setting up second grade labyrinth subassembly, reduce interference between one-level dry gas seal subassembly, second grade dry gas seal subassembly and the tertiary dry gas seal subassembly.

The primary labyrinth seal assembly comprises a primary mounting cylinder and a primary labyrinth ring, wherein a plurality of primary annular deep grooves are formed in the inner annular surface of the primary stationary ring 13, the primary mounting cylinder is sleeved on the bearing sleeve 2, the inner side surface of the primary mounting cylinder is fixedly connected with the outer side surface of the bearing sleeve 2, the inner annular surfaces of the plurality of primary labyrinth rings are fixedly connected with the outer side surface of the primary mounting cylinder, and the plurality of primary labyrinth rings are respectively arranged in the plurality of primary annular deep grooves;

second grade labyrinth seal subassembly includes a second grade installation section of thick bamboo and second grade labyrinth ring, and the interior anchor ring of second grade quiet ring 23 is provided with a plurality of second grade annular deep grooves, and second grade installation section of thick bamboo suit is on bearing housing 2, and the medial surface of a second grade installation section of thick bamboo and bearing housing 2's lateral surface fixed connection, a plurality of second grade labyrinth ring's interior anchor ring and the lateral surface fixed connection of a second grade installation section of thick bamboo, and a plurality of second grade labyrinth rings set up respectively in a plurality of second grade annular deep grooves.

The working principle of the primary labyrinth seal assembly is explained as follows:

if the gas of the one-level dry gas sealing assembly needs to enter the two-level dry gas sealing assembly, the gas needs to enter the first one-level annular deep groove along the first one-level labyrinth ring, and the gas travels two ring-width strokes in the first one-level annular deep groove, and then enters the second one-level annular deep groove along the second one-level labyrinth ring, and meanwhile, the gas also needs to travel two ring-width strokes in the second one-level annular deep groove.

The working principle of the secondary labyrinth seal assembly is similar to that of the secondary labyrinth seal assembly, and the detailed description is omitted again.

The width of one-level annular deep groove is greater than the thickness of one-level labyrinth ring, and the diameter of one-level annular deep groove is greater than the external diameter of one-level labyrinth ring, and the width of second grade annular deep groove is greater than the thickness of second grade labyrinth ring, and the diameter of second grade annular deep groove is greater than the external diameter of second grade labyrinth ring.

By defining the dimensions of the annular deep groove and the labyrinth ring, interference between the annular deep groove and the labyrinth ring can be avoided.

In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

It will be understood by those skilled in the art that the foregoing embodiments are provided for clarity of description only, and are not intended to limit the scope of the invention. Other variations or modifications to the above described embodiments will be apparent to those skilled in the art and are within the scope of the invention.

Claims

1. A three-stage dry gas sealing structure of a high-pressure compressor of a hydropower station is arranged on a rotating shaft and is characterized by comprising a bearing sleeve, an outer sealing shell, a primary dry gas sealing assembly, a secondary dry gas sealing assembly and a three-stage dry gas sealing assembly;

the fixed suit of bearing housing is in on the rotatory pivot, the both ends of outer seal shell with the both ends movive seal of bearing housing is connected, outer seal shell with set up to sealed chamber between the bearing housing, one-level dry gas seal assembly second grade dry gas seal assembly with tertiary dry gas seal assembly establishes ties in proper order and sets up sealed intracavity.

2. The three-stage dry gas sealing structure of the high-pressure compressor of the hydropower station according to claim 1, wherein the bearing sleeve is of a cylindrical structure, and the inner side surface of the bearing sleeve is fixedly connected with the outer side surface of the rotating shaft in a sealing manner;

the outer sealing shell comprises a first circular ring, a second circular ring and a straight cylinder, the first circular ring, the second circular ring and the straight cylinder are coaxially arranged, the outer annular surface of the first circular ring is fixedly and hermetically connected with the first end of the straight cylinder, the outer annular surface of the second circular ring is fixedly and hermetically connected with the second end of the straight cylinder, and the inner annular surface of the first circular ring and the inner annular surface of the second circular ring are respectively in movable sealing connection with the bearing sleeve.

3. The three-stage dry gas sealing structure of the high-pressure compressor of the hydropower station according to claim 1, wherein one end of the sealing structure is set to be a left side, and the other end of the sealing structure is set to be a right side;

the primary dry gas sealing assembly comprises a primary fixing ring, a primary moving ring, a primary static ring supporting seat and a primary elastic assembly, the primary fixing ring is sleeved on the bearing sleeve, the inner ring surface of the primary fixing ring is fixedly connected with the outer side surface of the bearing sleeve, the left side surface of the primary moving ring is fixedly connected with the right side surface of the primary fixing ring, the primary static ring is arranged on the right side of the primary moving ring, the primary static ring supporting seat is arranged on the right side of the primary static ring, the right side surface of the primary static ring is connected with the left side surface of the primary static ring supporting seat through the primary elastic assembly, and the outer ring surface of the primary static ring supporting seat is fixedly connected with the inner side surface of the outer sealing shell;

4. The three-stage dry gas sealing structure of the high-pressure compressor of the hydropower station according to claim 3, wherein a dynamic pressure groove for dry gas sealing is arranged on each of the right side surface of the primary moving ring, the right side surface of the secondary moving ring and the right side surface of the tertiary moving ring.

5. The three-stage dry gas sealing structure of the high-pressure compressor of the hydropower station according to claim 3, wherein the primary elastic assembly comprises a primary spring and a primary push ring, a primary annular groove is formed in the left side surface of the primary stationary ring support, a plurality of primary springs are horizontally arranged in the primary annular groove, the right end of the primary spring is vertically and fixedly connected with the bottom surface of the primary annular groove, the primary push ring is arranged between the primary stationary ring and the primary stationary ring support, the right side surface of the primary push ring is vertically and fixedly connected with the left end of the primary spring, and the left side surface of the primary push ring is attached to the right side surface of the primary stationary ring;

the secondary elastic component comprises a secondary spring and a secondary push ring, a secondary annular groove is formed in the left side face of the secondary static ring supporting seat, a plurality of secondary springs are horizontally arranged in the secondary annular groove, the right end of each secondary spring is vertically and fixedly connected with the bottom face of the corresponding secondary annular groove, the secondary push ring is arranged between the secondary static ring and the corresponding secondary static ring supporting seat, the right side face of the secondary push ring is vertically and fixedly connected with the left end of the corresponding secondary spring, and the left side face of the secondary push ring is attached to the right side face of the corresponding secondary static ring;

6. The three-stage dry gas sealing structure of the high-pressure compressor of the hydropower station according to claim 3, wherein a first-stage support ring is arranged on the left side of the first-stage static ring support seat, a second-stage support ring is arranged on the left side of the second-stage static ring support seat, a third-stage support ring is arranged on the left side of the third-stage static ring support seat, and the first-stage support ring, the second-stage support ring and the third-stage support ring are all coaxially arranged with the bearing sleeve;

7. The three-stage dry gas sealing structure of the high-pressure compressor of the hydropower station according to claim 3, wherein a primary gas inlet communicated with the primary dry gas sealing assembly is formed in the outer sealing shell, a secondary gas inlet communicated with the secondary dry gas sealing assembly is formed in the outer sealing shell, and a tertiary gas inlet communicated with the tertiary dry gas sealing assembly is formed in the outer sealing shell;

8. The three-stage dry gas sealing structure of the high-pressure compressor of the hydropower station according to claim 3, further comprising a first-stage labyrinth seal assembly and a second-stage labyrinth seal assembly, wherein the first-stage labyrinth seal assembly is arranged between the first-stage dry gas seal assembly and the second-stage dry gas seal assembly, and the second-stage labyrinth seal assembly is arranged between the second-stage dry gas seal assembly and the third-stage dry gas seal assembly.

9. The three-stage dry gas sealing structure of the high-pressure compressor of the hydropower station according to claim 8, wherein the primary labyrinth seal assembly comprises a primary mounting cylinder and a primary labyrinth ring, the inner annular surface of the primary stationary ring is provided with a plurality of primary annular deep grooves, the primary mounting cylinder is sleeved on the bearing sleeve, the inner side surface of the primary mounting cylinder is fixedly connected with the outer side surface of the bearing sleeve, the inner annular surfaces of the primary labyrinth rings are fixedly connected with the outer side surface of the primary mounting cylinder, and the primary labyrinth rings are respectively arranged in the primary annular deep grooves;

10. The three-stage dry gas sealing structure of the high-pressure compressor of the hydropower station according to claim 9, wherein the width of the primary annular deep groove is larger than the thickness of the primary labyrinth ring, the diameter of the primary annular deep groove is larger than the outer diameter of the primary labyrinth ring, the width of the secondary annular deep groove is larger than the thickness of the secondary labyrinth ring, and the diameter of the secondary annular deep groove is larger than the outer diameter of the secondary labyrinth ring.