CN216279343U

CN216279343U - Water turbine self-compensating type sealing ring with dissimilar material composite structure for main shaft sealing

Info

Publication number: CN216279343U
Application number: CN202122526395.7U
Authority: CN
Inventors: 何生荣; 何遇秋
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-10-20
Filing date: 2021-10-20
Publication date: 2022-04-12
Anticipated expiration: 2031-10-20

Abstract

A sealing ring with a heterogeneous material combined structure for self-compensation type main shaft sealing of a water turbine is formed by combining a plurality of uniformly distributed arc-shaped block components, an outer ring working surface and an inner ring working surface are formed by an inwards concave active pressure water supply annular groove, and the arc-shaped block components of the sealing ring are connected and combined into a whole by an aluminum alloy material layer and an ultrahigh molecular weight polyethylene material layer. The utility model adopts the high-strength aluminum alloy material plate and the modified ultrahigh molecular weight polyethylene material (modified UHMWPE) plate containing trace carbon fiber material to combine an integrated structure by mechanical connection and bonding, and the combined joint of the sealing ring adopting the structure realizes '0' clearance seamless fit, realizes the integrity and continuity of active pressure water film operation, ensures that the sealing matching surface works in a good matching form by running-in, is particularly suitable for a water turbine in a sediment-rich river, and prevents the sealing from being rapidly damaged due to the invasion of sediment-containing water flow into the sealing.

Description

Water turbine self-compensating type sealing ring with dissimilar material composite structure for main shaft sealing

Technical Field

The utility model belongs to the sealing category in the mechanical field, and relates to a sealing ring with a dissimilar material combined structure for a self-compensation type main shaft seal of a water turbine.

Background

The self-compensating axial end face seal of the main shaft of the water turbine is a liquid medium pressure seal and a controllable pressure water film seal which can automatically keep the key sealing mating parts of a sealing device, namely a sealing ring (a static ring) and a metal rotating ring (a dynamic ring) to play a sealing function through pressure balance, and form a micro gap and an active pressure water film with the corresponding thickness controlled between 0.05mm and 0.10 mm; in operation, an active water supply ring groove in the middle of a sealing ring of the sealing device enables a plane of a matching surface of the sealing ring and a rotating ring to be divided into an outer ring and an inner ring, an outer ring active pressure water film and an inner ring active pressure water film are also formed at the matching position of the corresponding sealing ring and the rotating ring, and when external invasion water flows from a hydraulic turbine working chamber to the sealing device and is to invade and seal through the periphery of the outer ring of the sealing ring, the sealed outer ring active pressure water film prevents the invasion water from entering the seal and entering the water turbine generator set by utilizing the pressure difference with the pressure higher than the pressure of the invasion water; meanwhile, the sealed outer ring pressure water film and the inner ring pressure water film generate controllable water leakage due to pressure difference, and the controllable water leakage is discharged into a runner related flow passage of the runner working chamber and a top cover water collecting device designed in advance in the inner ring direction respectively and then discharged.

The sealing working surface is completely not contacted with the pressure water film and plays a sealing function, and the self-compensation type axial end surface sealing of the main shaft of the water turbine is different from other end surface sealing.

The self-compensating axial end-face sealing ring (stationary ring, non-rotation) of the main shaft of the water turbine in the prior art mainly adopts a block combined structure form and uses an unmodified ultra-high molecular weight polyethylene (UHMWPE) material thermoplastic high polymer material without adding a fiber reinforced material; also adopts block structure form, using fiber reinforced phenolic material thermosetting high molecular engineering plastic; several non-metal materials with low hardness and low strength such as carbon graphite materials are also adopted (compared with stainless steel materials adopted by the rotating ring);

the self-compensating axial end (flat) surface sealing device of the water turbine in the prior art as shown in fig. 1 comprises a main shaft 1, a floating ring 22, and a plurality of sealing rings 24 with an ultrahigh molecular weight polyethylene material and a combined structure; a swivel 11 made of stainless steel metal.

The sealing ring 24 is provided with a stepped bolt through hole 242 which is connected to the floating ring 22 through a bolt, and under the combined action of the water pressure of the device and a spring, the sealing ring 24 and the rotating ring 11 reach a force balance state specified by design and are matched with a working end plane to form an active pressure water film 3 with the thickness of about 0.05mm-0.10mm to play a sealing function. The rotating ring 11 is connected on the flange end face of the main shaft 1 or the protecting cover end face of the flange end of the main shaft through a bolt and synchronously rotates along with the main shaft.

The sealing ring 24 is provided with an active water supply ring groove 25, and active water supply is introduced into the water supply ring groove 25 of the sealing ring from an active pressure water supply hole 242 of the sealing ring 24 through related piping and structures of the sealing device and enters a micro gap between a working ring plane of the sealing ring 24 and a swivel working ring plane to form an outer ring active pressure water film and an inner ring active pressure water film.

As shown in fig. 2, the ultra-high molecular weight polyethylene (UHMWPE) used in the sealing ring 24 in the prior art has the following main characteristics in terms of physical and mechanical properties: good toughness, impact resistance, low friction coefficient, wear resistance, low strength, low hardness, small density, light weight and large difference of physical thermal expansion coefficient compared with metal materials.

The physical thermal expansion coefficient value of the ultra-high molecular weight polyethylene material is about 18 times that of steel, 8 times that of aluminum alloy, the mechanical tensile strength is about 1/20-1/30 of steel, the mechanical tensile strength is about 1/20-1/25 of high-strength aluminum alloy, and the melting temperature is only 135-138 ℃.

The sealing ring 24 made of ultra-high molecular weight polyethylene material has the problem that the product is easy to deform under the condition that the material is sensitive to physical thermal expansion (linear expansion) due to the action of natural, physical and mechanical forces and other factors.

Therefore, the sealing ring 24 designed in the prior art generally uses a combined sealing structure with a plurality of evenly-divided blocks, and each set (group) of sealing rings determines the quantity of evenly-divided blocks of the sealing ring according to the diameter and the examination and consideration of a designer; the existing ultra-high molecular weight polyethylene with the diameter ranging from 1800mm to 4000mm is generally divided into 8 arc-shaped plate types (8/8) and 12 arc-shaped plate types (12/12), and meanwhile, all arc-shaped block combined joints of all combined type structure ultra-high molecular weight polyethylene sealing rings are designed with expansion joint structures for preventing deformation and adjusting gaps, namely, concave-convex inserted 5mm gap joints.

Thus, when the length of the sealing ring 24 and the segment arc block assembly 241 on the structure thereof increases or decreases due to temperature changes, the mechanical structure of the sealing ring assembly can not be damaged in a runaway way under the deformation stress.

The design weakens the influence of unstable structure of the sealing ring caused by the fact that the ultra-high molecular weight polyethylene material is easy to deform due to higher thermal expansion coefficient and the influence of incapability of safely operating the sealing ring.

Meanwhile, the sealing ring in the prior art has the advantages that the sealing ring structure of a plurality of equally-divided combined blocks is maintained, and meanwhile, a plurality of groups of expansion joint concave-convex joints with 5mm gap adjustment amount are generated, so that the integrity and the continuity of the working plane of the sealing ring are damaged, and further, the stable operation of a pressure water film with the thickness of 0.05mm-0.10mm set by the matching gap between the sealing ring and the rotating ring is adversely affected.

The ultra-high molecular weight polyethylene sealing ring adopted in the prior art has the material tensile strength of only about 17MPa, which is 1/2-1/3 of the strength (30MPa-50MPa) of PU polyurethane hard rubber; compared with the Shore D hardness (ShoeD) value of the rubber and plastic material standard, the hardness of the ultra-high molecular weight polyethylene is 62, the hardness of the polyurethane hard rubber is about 60, the hardness of the polyurethane hard rubber and the polyurethane hard rubber are very close to each other, and the hardness of the polyurethane hard rubber and the polyurethane hard rubber is a theorem corresponding to the hardness of a golf ball in foreign countries.

Because the high-toughness, low-hardness, low-strength and low-friction-coefficient ultrahigh molecular weight polyethylene material is used, the high-strength stainless steel rotating ring with the hardness 50-100 times that of the sealing ring material cannot form running-in to quickly correct manufacturing errors, installation errors and deformation of the metal rotating ring in the initial operation stage, and the sealing is influenced to improve the matching through self-adjustment.

Because the metal swivel is directly arranged on the spindle flange with strong rigidity, the self-compensation type axial end face seal of a part of water turbine spindles can repeatedly and accurately adjust the metal swivel by spending a large amount of time, ensure that the installation plane precision of the working plane of the metal swivel meets the design requirement and cannot deform and change after being put into operation, and therefore whether the initial running-in of the metal swivel and a sealing ring material is carried out or not does not influence the normal operation of the seal. However, for the axial-flow Kaplan turbine with a relatively large quantity ratio in the turbine, the problem that the mounting flatness and levelness of the metal swivel are difficult to adjust due to the fact that the metal swivel can only be mounted through a main shaft flange protecting cover structure with weak rigidity exists by adopting the main shaft self-compensation type axial end face seal of the turbine, and the problem that the matching condition of the sealing ring and the metal swivel is influenced due to the fact that the metal swivel is easy to deform due to water pressure and a mechanical structure and cannot be corrected by running-in after mounting and running.

In a word, the ultra-high molecular weight polyethylene material sealing ring with the self-compensating axial end face seal of the main shaft of the water turbine in the prior art has the problems that a plurality of expansion joints with the width of 5mm are generated by a combined joint, the radial length reaches about 8mm-10mm, and the size of the axial section of the penetrating sealing ring (30mm-45mm), the integrity and the continuity of a pressure water film on an outer ring working plane (the size of the width of 20 mm-25 mm) of the sealing ring can be influenced undoubtedly, the integrity and the continuity of the pressure water film on an upper ring plane in the size of an inner ring working end plane (the width of 25mm-30mm) can be influenced undoubtedly, and the discontinuous structure of reliable operation of the seal is influenced.

The existing ultra-high molecular weight polyethylene material sealing ring with the self-compensating axial end face seal for the main shaft of the water turbine has the problems that the flat working surface of a running-in metal swivel cannot be corrected due to no running-in capability, and the long-term standard safe operation of the seal in a benign matching state is influenced due to the deviation caused by the deformation of manufacturing, installation and operation. Meanwhile, for the water turbine running in a silt-laden river, the problem of the main shaft self-compensation type axial end face seal easily causes the leakage water of the runner working chamber containing a large amount of silt and hard sand particles to invade into the seal to cause quick damage of the seal, and threatens the safety of the seal and power generation equipment.

Disclosure of Invention

The utility model aims to: aiming at the defects of the prior art, the sealing ring with the dissimilar material composite structure for the self-compensation type main shaft sealing of the water turbine is simple in structure, high in stability, good in sealing performance and controllable in deformation of the sealing ring.

The technical purpose of the utility model is realized by the following technical scheme:

the utility model provides a hydraulic turbine is sealing with xenogenesis material integrated configuration sealing ring for self-compensating type main shaft, the sealing ring is formed by the combination of a plurality of arc block group spares, the sealing ring is become to have outer loop working face and inner ring working face by the initiative pressurized water supply ring groove shape of indent, the arc block group spare of sealing ring is as an organic whole by aluminum alloy material layer and ultra high molecular weight polyethylene material layer connection combination.

The aluminum alloy material layer is a high-strength aluminum alloy material plate with the elastic modulus of more than 68GPa and the thickness of more than 15 mm.

And carbon graphite columns penetrating through the aluminum alloy material layer and the ultra-high molecular weight polyethylene material layer are arranged around the inner ring and the outer ring of the sealing ring.

And 0-shaped clearance seamless fit joints are arranged among the arc-shaped block components.

Compared with the prior art, the utility model has the beneficial effects that:

1. the deformation of the sealing ring with the double-layer composite structure of the dissimilar materials can be reduced by restraining the deformation of the ultrahigh molecular weight polyethylene material layer by the high-strength aluminum alloy material layer, so that the deformation of the structure and the size of the sealing ring is completely controllable, and the sealing device has the advantages of high stability, good sealing performance and capability of effectively improving the safety and the reliability of the whole sealing device.

2. The joint of the arc block components which are mutually connected and combined is a seamless joint in '0' clearance fit, so that the planes of the inner ring and the outer ring after the sealing ring is arranged on the floating ring can be ensured not to have any discontinuous structure, and the integrity of the active pressure sealing water film during operation is ensured.

3. The plane of the outer ring of each arc-shaped block is provided with a plurality of carbon graphite columns penetrating through the modified ultra-high molecular weight polyethylene material layer and the aluminum alloy material layer, the plane of the inner ring is also provided with a plurality of carbon graphite columns penetrating through the modified ultra-high molecular weight polyethylene material layer and the aluminum alloy material layer, every two carbon graphite columns are distributed on two sides of a stepped screw hole for connecting and fastening the floating ring in a group, and the carbon graphite columns are bonded, cured and tightly fixed in corresponding straight through holes by a loctite adhesive. The carbon graphite post has high strength, low hardness, self-lubricating characteristics, is favorable to supplying water in the initiative not normal with the cooling when not enough through setting up the carbon graphite post, the non-normal operating mode that contact friction appears in sealed face and the rotating ring working face of mutually supporting produces the self-lubricating solid lubrication film, and protection sealing ring safe operation just does not take place to burn out the accident to reporting to the police machine. The carbon graphite column has a solid lubrication effect when in use, can effectively reduce the friction and wear between the end face of the sealing ring and the rotating ring, improves the safety and reliability of the sealing device, and strengthens the connecting structure between the aluminum alloy material layer and the ultra-high molecular weight polyethylene material layer.

4. The utility model adopts the modified ultra-high molecular weight polyethylene material which contains trace carbon fiber powder or trace chopped carbon fiber (the length is about 3mm-5mm) and improves the microscopic strength of the material, so that the matching ring planes of the sealing ring and the stainless steel swivel ring can be effectively ground, thereby creating conditions for reasonable, safe, reliable and long-term operation of the sealing device according to the design state.

Drawings

Fig. 1 is a schematic view showing an assembled operation of a self-compensating (pressure self-compensating) axial end face sealing device of a water turbine in the prior art;

FIG. 2 is a schematic view of a prior art sealing ring structure 24 made of ultra-high molecular weight polyethylene material;

FIG. 3 is a structural schematic of the sector arc block assembly 241 of FIG. 2;

FIG. 4 is a bottom view of a schematic of one configuration of the present invention;

FIG. 5 is a schematic view of the arcuate block assembly 81 of FIG. 4;

FIG. 6 is a cross-sectional view C-C of FIG. 5;

FIG. 7 is a cross-sectional view D-D of FIG. 5;

FIG. 8 is a perspective view of FIG. 5;

reference numerals: 1-main shaft of water turbine: 11-swivel; 21-a sealing seat; 22-a floating ring; 23-a spring; 24-a sealing ring; 241-a sector arc block assembly; 242-active pressurized water supply hole; 243-stepped bolt through hole; 25-active pressure water supply ring groove; 3-a pressure water film layer; 4-active pressure water supply pipeline system; 5-active controllable internal drainage; 6-controllable external drainage; 7-leakage of water; 8-novel sealing ring with a double-layer composite structure made of dissimilar materials; 81-arc block assembly; 811-a layer of aluminium alloy material; 812-a layer of ultra high molecular weight polyethylene material; 82-active pressure water supply ring groove; 821-an outer ring; 822-inner ring; 83-bolt hole; 84-stepped bolt holes; 85-carbon graphite columns; 86-carbon graphite columns; 87-glue; 88-active water supply through hole; 89-plane sealant layer.

Detailed Description

Specific embodiments of the utility model are described below with reference to the accompanying drawings:

as shown in fig. 4-8, a sealing ring 8 of a heterogeneous material composite structure for a self-compensating main shaft seal of a water turbine is provided, wherein the sealing ring 8 is formed by combining 4 equally-divided arc-shaped block components 81, the sealing ring 8 is formed with an outer ring working surface and an inner ring working surface by an inwards-concave active pressure water supply ring groove 82, and the arc-shaped block components 81 of the sealing ring 82 are connected and combined into a whole by an aluminum alloy material layer 811 and an ultra-high molecular weight polyethylene material layer 812. The arc-shaped block assembly 81 is bolted to the floating ring 22 through stepped bolt holes 84, an aluminum alloy material layer 811 of the arc-shaped block assembly is used for connecting with a fixing part (floating ring 22) of the water turbine, and an ultra-high molecular weight polyethylene material layer 812 is used as a sealing layer and is matched with the rotating ring 11 on the main shaft 1 of the water turbine.

The deformation of the high-strength aluminum alloy material layer 811 restraining the ultra-high molecular weight polyethylene material layer 812 can be reduced, the deformation of the sealing ring 8 of the dissimilar material double-layer combined structure can be completely controlled, the structure and the size of the sealing ring 8 are completely controllable, and the sealing device has the advantages of high stability, good sealing performance and capability of effectively improving the safety and the reliability of the whole sealing device.

Specifically, the double-layer material structure of the arc block assembly 81 is a structural functional layer of a 7075 ultrahigh-strength aluminum alloy material layer 811 for the aviation industry and a sealing functional layer of an ultrahigh-molecular-weight polyethylene material 812 with a running-in correction capability.

The following is a comparison table of performance parameters of an aluminum alloy material 811 used by the sealing ring 8 with the dissimilar material double-layer combined structure, and an ultra-high molecular weight polyethylene material 812 used by the sealing ring, and QUADRANT ultra-high molecular weight polyethylene material of Swiss and Cross-coursers company in the prior art:

Figure 508236DEST_PATH_GDA0003508979290000081

data sources and references:

1. national standard GB/T3190-₃Replacing the material of the machine body: 7075 aluminium alloy.

2. Mechanical industry Press 1982 edition "third volume material of mechanical engineering Manual"

3. Product description introduction of "Swiss engineering plastics Profile products" product description of the Swiss QUADRANT Cross Jun company.

4. The journal of engineering plastics application published in 1996 at stage 5 "properties and applications of ultra-high molecular weight polyethylene".

5. Modified ultrahigh molecular weight polyethylene material plates and detection reports were accepted by the Haohcheng optical chemical research institute in China in-2013 (Deyang Debao service department of Power Generation devices, Deyang Lixin electromechanical sealing technology, Ltd.).

As shown in fig. 4. The working surface of the ultra-high molecular weight polyethylene material layer (812) of the arc block assembly 81 can also adopt a black modified ultra-high molecular weight polyethylene material (modified UHMWPE) plate containing 3-10% (weight ratio and volume ratio) of carbon fiber powder. In practical use, the carbon fiber powder can also be micro short carbon fiber (the length is about 3mm-5 mm). Modified engineering plastics or high molecular materials are widely applied to the mechanical-physical-chemical combination mode, and various dissimilar materials with the functions of improving materials, such as self-lubricating function, bearing capacity or friction and wear, are added into a base material. The modified ultrahigh molecular weight polyethylene is added with trace proportion, and the non-metallic carbon fiber powder material with higher strength than the base material is dispersed in the base material, so that when the sealing ring with the dissimilar material double-layer combined structure is matched with a stainless steel swivel, the carbon fiber material in the modified UHMWPE working layer on the sealing ring corrects the abnormal shape of the working ring plane of the stainless steel swivel through friction running-in. Thereby realizing the good matching of the sealing ring and the plane of the rotating ring sealing ring.

As shown in fig. 4 and 8, the aluminum alloy material layer 811 is a high-strength aluminum alloy material sheet having an elastic modulus of 68GPa or more and a thickness of 15mm or more. Specifically, the arc block assembly 81 has an axial sectional dimension of 40mm in height, and the aluminum alloy material plate 811 shown in section, i.e., employed on the double-layer structure of each sector arc block 81, has a thickness of 18 mm. By adopting the aluminum alloy material with small specific gravity and high strength as the structural material of the heterogeneous material double-layer structure sealing ring, the deformation influence of the modified UHMWPE with the double-layer structure can be effectively controlled, and meanwhile, the total weight increase value of the sealing ring product can be controlled better compared with the use of a steel material with the same strength and the specific gravity which is about 2.8 times higher than that of the aluminum alloy. Is favorable for light installation when the product is used.

As shown in fig. 8, in the present embodiment, the two ends of the arc block assemblies 81 are smooth and planar structures, and a seamless matching structure equal to or tending to "0" is provided between the arc block assemblies 81. In practical use, the joints at the two ends of the arc block assembly 81 can be in various shapes matched with each other, such as a concave-convex structure and the like. In order to better ensure that the working ring plane of the sealing ring realizes real '0' gap defect-free operation, the sealing ring 8 can seal the joint of the arc block component 81 of the sealing ring 8 by using a proper sealant material during installation and operation without worrying about deformation and damage of the sealing ring 8. By adopting a straight-seam straight-surface matching joint with radial end planes directly attached to each other, the planes of the inner ring and the outer ring working rings after the sealing ring 8 is arranged on the floating ring 22 can be ensured not to have any discontinuous structure, and the integrity of the active pressure sealing water film during operation is ensured.

As shown in fig. 4-8, the working surface (sealing surface) of the ultra-high molecular weight polyethylene material layer 812 has a plurality of circumferentially arranged active pressure water supply ring grooves 82 having a concave structure, a plurality of bolt holes 83 are arranged in the active pressure water supply ring grooves 82 at intervals, and are connected by a plurality of bolts and washers which can combine the alloy material layer 811 and the ultra-high molecular weight polyethylene material layer 812, and a plurality of active water supply holes 88 which can respectively communicate with water supply channels are arranged in the active pressure water supply ring grooves 82 at intervals. Specifically, two active water supply holes 88 are provided on the arc block assembly 81, and the total number of the active water supply holes 88 of the entire sealing ring 8 and the active water supply ring groove 82 of the sealing ring 8 are filled with active pressure water. Each arc block assembly 81 has 12 bolt holes 83 for forming a double-layer material integral connection, and the bolt holes 83 are fixed by bolt and washer combination connection. The whole sealing ring 8 has 8 water supply holes 88 and 40 floating ring connecting stepped screw holes 81 and 48 bolt holes 83 for realizing a double-layer integrated combined structure of 4 groups of sector arc-shaped blocks 81. When in actual use, alloy material layer 811 and ultra-high molecular weight polyethylene material layer 812 are put together through multiunit bolt and packing ring, and its simple structure, simple to operate enable alloy material layer 811 and ultra-high molecular weight polyethylene material layer 812 firm in connection stable through bolted connection simultaneously, and bolted connection structure does not influence the sealed effect of sealing ring and rotating ring simultaneously.

In actual use, 89 of a layer of loctite 510 plane sealant is coated between the layered surfaces of the combined and connected integrated structure of the aluminum alloy material layer 811 and the ultra-high molecular weight polyethylene material layer 812 of the arc-shaped block assembly 81. In actual use, in order to improve the connection strength between the aluminum alloy material layer 811 and the ultra-high molecular weight polyethylene material layer 812 and ensure the sealing performance, the aluminum alloy material layer and the ultra-high molecular weight polyethylene material layer can be connected by bolts and bonding structures; the possibility of sealing breakage is reduced, and the sealing performance is improved.

As shown in fig. 3, 10 through holes penetrating through the modified ultra-high molecular weight polyethylene material layer 812 and the aluminum alloy material layer 811 are provided on the annular plane of the outer ring 821 of each arc block 81, and carbon graphite columns 85 are provided in the through holes; also, 10 through holes penetrating through the modified ultra-high molecular weight polyethylene material layer 812 and the aluminum alloy material layer 811 are distributed on the ring plane of the inner ring 822, and carbon graphite columns 86 are arranged in the through holes, two of each of the carbon graphite columns 86 and the carbon graphite columns 85 are distributed on two sides of the stepped screw hole 84 for connecting and fastening with the floating ring 22, and are bonded, cured and tightly fixed in the corresponding straight hole through holes by using lotai 480 adhesive 87. When in actual use, a plurality of carbon graphite columns are arranged in the through holes and extend to the sealing surface; the through holes can be threaded holes, and the carbon graphite columns correspondingly adopt wear-resistant carbon bolt columns. The carbon graphite post has high strength, low hardness, self-lubricating characteristics, is favorable to supplying water in the initiative not normal with the cooling when not enough through setting up the carbon graphite post, the non-normal operating mode that contact friction appears in sealed face and the rotating ring working face of mutually supporting produces the self-lubricating solid lubrication film, and protection sealing ring safe operation just does not take place to burn out the accident to reporting to the police machine. The carbon graphite column has a solid lubrication effect when in use, can effectively reduce the friction and wear between the end face of the sealing ring and the rotating ring, improves the safety and reliability of the sealing device, and strengthens the connecting structure between the aluminum alloy material layer 811 and the ultra-high molecular weight polyethylene material layer 812.

The technical solutions of the above embodiments are only used for illustrating the present invention, and not for limiting the same. Although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical scheme can be modified, or part of technical characteristics can be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims

1. The utility model provides a hydraulic turbine is xenogenesis material integrated configuration sealing ring for self-compensating type main shaft seal, sealing ring (8) are formed by a plurality of arc block group spare (81) combinations of equalling divide, sealing ring (8) are formed with outer ring (821) working face and inner ring (822) working face by initiative pressurized water supply annular (82) of indent, its characterized in that: the arc-shaped block assemblies (81) of the sealing ring (8) are connected and combined into a whole by an aluminum alloy material layer (811) and an ultrahigh molecular weight polyethylene material layer (812).

2. The sealing ring of a dissimilar material composite structure for a self-compensating main shaft seal of a water turbine according to claim 1, wherein: the aluminum alloy material layer (811) is a high-strength aluminum alloy material plate with an elastic modulus of more than 68GPa and a thickness of more than 15 mm.

3. The sealing ring of a dissimilar material composite structure for a self-compensating main shaft seal of a water turbine according to claim 1, wherein: and carbon graphite columns penetrating through the aluminum alloy material layer (811) and the ultrahigh molecular weight polyethylene material layer (812) are arranged around the inner ring (822) and the outer ring (821) of the sealing ring (8).

4. The sealing ring of a dissimilar material composite structure for a self-compensating main shaft seal of a water turbine according to claim 1, wherein: and 0-shaped clearance seamless fit joints are arranged between the arc block assemblies (81).