CN106574622A - Rotary machine - Google Patents

Abstract

This rotary machine is provided with: multiple impellers (3) which are arranged in a line, each of said impellers having a disk (31) which rotates with a rotary shaft (2) rotating about an axis; and a casing (4) in which a casing flow path (43) for a working fluid (F) to flow therein is formed. An impeller (3) located farthest to the other side in the axial direction is disposed in a space connecting to the upstream side of the casing flow path (43) and has a protrusion (5) protruding from the rear side (311) of the disk (31). The protrusion (5) is formed parallel to the outer surface (21) of the rotary shaft (2) and has a seal surface (51) for sealing a gap from the casing (4) and a pressure-receiving surface (52) extending from the outer surface (21) to the seal surface (51).

Description

Rotating machinery

Technical field

The present invention relates to rotating machinery.

Background technology

The rotating machineries such as centrifugal compressor are existed by making working fluid in the internal circulation of the impeller of rotation using impeller The centrifugal force produced during rotation carrys out compression work fluid.As centrifugal compressor, it is known to by possess multiple impellers and rank The multistage centrifugal compressor that section property ground is compressed to working fluid.

One of such multistage centrifugal compressor is recorded in patent document 1.It is centrifugal described in patent document 1 Compressor is the single-shaft multi-stage centrifugal compressor that multiple impellers are provided with same rotary shaft.In the single-shaft multi-stage centrifugal In compressor, multiple impellers are mounted side by side in the axial direction relative to rotary shaft in housing.

Citation

Patent document

Patent document 1：Japanese Unexamined Patent Publication 2001-107888 publications

The content of the invention

The invention problem to be solved

However, in centrifugal compressor as described above, the compression work fluid by impeller rotation, with towards work The mode that a side side on the axis direction that fluid flows relative to rotary shaft pushes produces thrust.Particularly in such as multistage centrifugal Formula compressor is configured like that in the construction of multiple impellers towards same direction, and the thrust can become big.Therefore, such centrifugal In compressor, in order to weaken the thrust towards the side side on axis direction produced by impeller, adjoin in the most rear class of impeller Be configured with dummy piston, the dummy piston produces and the flat of the thrust that acts on rotary shaft is obtained towards rightabout thrust Weighing apparatus.

However, in the rotating machinery of working fluid of high pressure is made as multistage centrifugal compressor, high pressure Working fluid can be entered in the gap of impeller and dummy piston.Therefore, using the working fluid for easily producing solid product In the case of, solid product is deposited in such gap, it is possible to hinder the operating of rotating machinery.

The present invention provides a kind of rotation of the balance that can obtain the thrust for acting on rotary shaft by preventing gap from being formed Favourable turn tool.

Solution

Rotating machinery involved by the 1st aspect of the present invention possesses：Rotary shaft, it is pivoted about with axis；Leaf Wheel, it has the disk component rotated together with the rotary shaft, and is formed with the axis direction for making to extend from the axis The working fluid of one side's side inflow is radially oriented the internal flow path that outside is discharged, and abreast configures on the axis direction Have multiple；And housing, it is formed with housing stream, and the housing stream makes the working fluid from being configured at the axis direction On a side side impeller to the impeller circulation adjoined in the opposing party side, it is in multiple impellers, be at least configured in the axle Most there is convex portion by the impeller of the opposing party side on line direction, the convex portion is configured in and the upstream side communication of the housing stream In space, and in the way of the back side of the opposing party side from the direction axis direction of the disk component projects with the disk Component is integrally formed, and the convex portion has：Sealing surface, it is formed parallel to the outer surface of the rotary shaft, and to described Gap radially between convex portion and the housing is sealed；And compression face, its described appearance from the rotary shaft Face extends to the sealing surface.

According to such rotating machinery, by the axial direction most by the opposing party side most rear class impeller disk structure Convex portion is set on part, the impeller of most rear class can be utilized, make rotary shaft produce direction with the thrust produced by other multiple impellers The thrust in contrary direction.Thereby, it is possible to corrective action in the thrust of rotary shaft.In addition, by using with the bodily form of disk component one Into convex portion adjusting the thrust produced by rotary shaft, dummy piston can be made substantially to be integrally formed with disk component, therefore nothing Other components need to be used, is prevented from forming unnecessary gap.

Rotating machinery involved by the other modes of the present invention can also be that the housing is formed with makes the working fluid Externally to the suction inlet that the housing stream is flowed into, the suction inlet is connected with the space.

According to such rotating machinery, connected with suction inlet by making space, can make with relative to compression face from axis A side side on direction becomes maximum towards the power that the mode of the opposing party's side stretching is acted on.It is convex via being provided with therefore, it is possible to increase The disk component in portion and act on the thrust towards the opposing party side on axis direction of rotary shaft from impeller.Thus, even if in rotation In the case that rotating shaft produces larger thrust, it is also possible to stably obtain the balance of the thrust produced by rotary shaft.

Rotating machinery involved by the other modes of the present invention can also be that the convex portion is being leaned on radially than the sealing surface Inner side position at there is recess, the recess from the compression face towards the axis direction on a side side depression.

According to such centrifugal compressor, by forming recess, the increasing of the weight of the impeller with convex portion can be suppressed Plus.

Impeller involved by the 2nd aspect of the present invention is the impeller arranged in rotating machinery, and the rotating machinery possesses： Rotary shaft, it is pivoted about with axis；Multiple impellers, they have the disk component rotated together with the rotary shaft, And the working fluid of the side's side inflow being formed with the axis direction for making to extend from the axis is radially oriented what outside was discharged Internal flow path, and be abreast configured with the axial direction multiple；And housing, it is formed with housing stream, the housing stream Road makes the working fluid from the impeller of the side side being configured on the axis direction to the impeller stream adjoined in the opposing party side Logical, the impeller is configured on the axis direction of rotating machinery and most leans on the opposing party side, wherein, the impeller has convex Portion, the convex portion in the way of the back side of the opposing party side from the direction axis direction of the disk component projects with the disk Component is integrally formed, and is configured in the space with the upstream side communication of the housing stream, and the convex portion has：Sealing Face, it is formed parallel to the outer surface of the rotary shaft, and to the gap radially between the convex portion and the housing Sealed；And compression face, it extends to the sealing surface from the outer surface of the rotary shaft.

Invention effect

According to above-mentioned rotating machinery, using the convex portion being integrally formed with disk component, can obtain and act on pushing away for rotary shaft The balance of power.In addition, the gap for being prevented from the disk component back side is formed.

Description of the drawings

Fig. 1 is the schematic diagram for illustrating the centrifugal compressor in embodiments of the present invention.

Fig. 2 is the enlarged drawing of the impeller of the most rear class for illustrating the centrifugal compressor in embodiments of the present invention.

Specific embodiment

Hereinafter, is seen figures.1.and.2 and the embodiment in the present invention is illustrated.

The rotating machinery of present embodiment is centrifugal compressor 1, and single-shaft multi-stage centrifugal is become in the present embodiment Compressor.The centrifugal compressor 1 of present embodiment makes to be circulated as the nitric acid of working fluid F for example for nitric acid plant etc. And it is compressed.As shown in figure 1, the centrifugal compressor 1 of present embodiment possesses：Pivoted about with axes O Rotary shaft 2, multiple impellers 3 for being fixed in the way of it can rotate integrally with rotary shaft 2 and rotary shaft 2 and impeller 3 are received Hold housing 4 internally.

Rotary shaft 2 is formed along the cylindric of axes O extension, is revolved around axes O using power sources such as motor (not shown) Turn.It is embedded with outside rotary shaft 2 and is contained in the impeller 3 of housing 4, and is pivoted about with axes O together with impeller 3.The rotation Axle 2 is to rotate freely relative to housing 4 by the bearing of journals 41 and the supporting of thrust bearing 42, and is entered by motor (not shown) Row drives and rotates.

Multiple impellers 3 are abreast to match somebody with somebody at spaced intervals on axes O direction with the direction extended in the axes O of rotary shaft 2 It is equipped with the inside that multiple modes are housed in housing 4.In the centrifugal compressor 1 of present embodiment, with along axes O direction The corresponding mode of each impeller 3 of configuration, possess from axes O direction most by the configuration of a side side (paper left side) in Fig. 1 For in the first order compressor stage (most prime compressor stage) 11 to axes O direction of most prime most by the opposing party side (in Fig. 1 Paper right side) the level V compressor stage (most rear class compressor stage) 15 for being configured to most rear class till this Pyatyi compressor stage 11、12、13、14、15。

Housing 4 is shaped generally as columned gabarit, and rotary shaft 2 is configured in the way of through the center of housing 4.In shell On body 4, the both sides on axes O direction are provided with the bearing of journals 41, and the side side on axes O direction is provided with thrust bearing 42. In other words, housing 4 is supported via the bearing of journals 41 and thrust bearing 42 to rotary shaft 2.Repetition contracting is provided with housing 4 Footpath and expanding inner space, contain multiple impellers 3 in the inner space.Housing stream 43 is formed with housing 4, should Housing stream 43 make working fluid F from the side side on axes O direction i.e. upstream side configuration impeller 3 to axes O direction On the opposing party side be that the adjacent impeller 3 in downstream circulates.In housing 4, the upstream side communication with housing stream 43 is formed with Space be low-voltage space 44.

Housing stream 43 will be communicated to outlet 434 from suction inlet 431 in housing 4 via impeller 3, and the suction inlet 431 sets Put the first side on the axes O direction of the rotary shaft 2 i.e. end of the housing 4 of a side side and make working fluid F from outside inflow, The outlet 434 is arranged on the second side i.e. end of the opposing party side towards the side contrary on axes O direction with a side side And working fluid F is made to outside discharge.

Specifically, the housing stream 43 of present embodiment has：Make working fluid F from the outside suction inlet 431 for flowing into, Import the divergent flow path 432 of working fluid F, from divergent flow path 432 import working fluid from the internal flow path 34 of impeller described later 3 F simultaneously imports the return stream 433 of working fluid F and makes working fluid F to outside discharge to the internal flow path 34 of impeller 3 Outlet 434.

The end of a side side of the suction inlet 431 on the axes O direction of housing 4 and the ft connection of housing 4.Suction inlet The entrance of the internal flow path 34 of the impeller 3 of the 431 most primes arranged with the end of the side side on axes O direction is connected.

The radially inner side of the housing 4 centered on rotary shaft 2 of divergent flow path 432 and going out for the internal flow path 34 of impeller 3 Mouth connection, makes the working fluid F after being boosted by impeller 3 be radially oriented outside circulation.

The side for returning stream 433 connects with divergent flow path 432, and another side enters with the internal flow path 34 of impeller 3 Mouth connection.The return stream 433 makes the direction of the working fluid F that outside flowing is radially oriented by divergent flow path 432 with court The mode of radially inner side is inverted.

The end of the opposing party side of the outlet 434 on the axes O direction of housing 4 and the ft connection of housing 4.Outlet The outlet of the internal flow path 34 of the impeller 3 of the 434 most rear classes arranged with the end of the opposing party side on axes O direction is connected.

Low-voltage space 44 is formed in the opposing party side on the axes O direction of the impeller 3 of the most rear class of housing 4.Low-voltage space The 44 housing streams 43 with the impeller 3 than most rear class by upstream side are connected.In other words, low-voltage space 44 and housing stream 43 it In, pressure ratio compressed by the impeller 3 of most rear class after working fluid F it is low part connection.In the present embodiment, low-voltage space 44 suction inlets 431 minimum with pressure among housing stream 43 are connected, and are become and the identical pressure of suction inlet 431.

As shown in Fig. 2 each impeller 3 has：The gradually expanding substantially discoid disk structure with outside is radially oriented Part 31 and the side side on from the surface of disk component 31 towards the axes O direction of rotary shaft 2 are radial in the way of erecting Be installed on disk component 31 and circumferentially multiple blades 32 side by side.The impeller 3 has with the side side edge from axes O direction Circumferentially cover the cover 33 that the mode of this multiple blade 32 is installed.

It should be noted that each impeller 3 can also be the open impeller without cover 33.

Impeller 3 is formed with to be made the working fluid F of the side's side inflow from axes O direction to be radially oriented what outside was discharged The space that mode circulates i.e. internal flow path 34.

The internal flow path 34 is circumferentially gone up two faces of mutual adjacent pair blade 32 and is separately positioned on blade 32 Axes O direction on both sides disk component 31 and cover 33 face mark off come.Internal flow path 34 is by blade 32 and disk component 31 rotate integrally and obtain working fluid F and discharge it.Specifically, for the working fluid F for internally circulating, inside stream Entrance that road 34 flows into a side side, the i.e. radially inner side on the axes O direction in blade 32 as working fluid F and obtain stream Body.Outlet that internal flow path 34 flows out radial outside as working fluid F and discharge guided working fluid F.

The front surface towards the side side on axes O direction of disk component 31 is path, towards another on axes O direction The back side 311 of square side is big footpath.Disk component 31 is another towards being located at the front surface from the side side on axes O direction The back side 311 of square side is gradually expanding.That is, disk component 31 is in substantially discoid under the observation of axes O direction, and entirety is in substantially umbrella shape Shape.

Disk component 31 is formed with the through hole along axes O direction through disk component 31 in radially inner side.Insert to the through hole Enter rotary shaft 2 and be fitted together to by shrunk fit (not shown) or via keyway, impeller 3 is fixed relative to rotary shaft 2, can Integratedly rotated with rotary shaft 2.

In multiple impellers 3, most having and disk component by the impeller 3 of the opposing party side configuration at least axes O direction 31 integrally formed convex portions 5.In the present embodiment, as shown in figure 1, most leaning on the opposing party side i.e. most only on axes O direction The impeller 3 of the configuration of level V compressor stage 15 of rear class has convex portion 5.

The face i.e. back side 311 of disk component 31 that convex portion 5 intersects from the outer surface 21 with rotary shaft 2 is towards on axes O direction Rear side is projected.Convex portion 5 is configured at low-voltage space 44.The convex portion 5 of present embodiment is surrounding the side of the through hole of disk component 31 Formula is annularly projected from the back side 311 of disk component 31.As shown in Fig. 2 the convex portion 5 of present embodiment has：With rotary shaft 2 Sealing surface 51 that outer surface 21 is formed parallel to, the compression face 52 that sealing surface 51 is extended to from the outer surface 21 of rotary shaft 2 and From the recess 53 of the depression of compression face 52.

Sealing surface 51 is by the clearance seal of the radial direction between housing 4 and disk component 31.Sealing surface 51 is convex portion 5 towards footpath Horizontal plane laterally, and extend parallel to axes O.The sealing surface 51 of present embodiment has labyrinth 51a, and The back side 311 of the side side from axes O direction towards the opposing party side along disk component 31 extends for seal operation fluid F The width of needs.In other words, the sealing surface 51 of present embodiment is radially oriented between the horizontal plane of inner side in housing 4 Row sealing.Therefore, sealing surface 51 suppresses the working fluid F of the high pressure discharged from the internal flow path 34 of impeller 3 towards low-voltage space 44 spill.

In addition, in the present embodiment, the overhang of the convex portion 5 projected from the back side 311 of disk component 31 is by sealing surface 51 Axes O direction on width determining.

Sealing surface 51 is formed in and separates at the position of predetermined distance with the outer surface 21 of rotary shaft 2.Specifically, this enforcement The predetermined distance of outer surface 21 of the sealing surface 51 in mode away from the rotary shaft 2 for being formed is referred to, another from axes O direction The radical length of the compression face 52 counted from the outer surface 21 of rotary shaft 2 during square side observation compression face 52.The distance of regulation is According to the value set in advance of centrifugal compressor 1.In order to obtain the balance of the thrust for acting on rotary shaft 2, according to compression face 52 The size of the power being subject to determine specify distance.The distance of the regulation of present embodiment is big according to the pressure of low-voltage space 44 It is little with compressed by the impeller 3 of most rear class after working fluid F pressure size ratio determining.

Therefore, the sealing surface 51 of present embodiment is for example determined as follows：Merely with the most rear class for being provided with convex portion 5 Impeller 3, with the impeller 3 by most rear class beyond other impellers 3 result from rotary shaft 2 towards the side on axes O direction The equal size of the thrust of side, is possible to make rotary shaft 2 produce towards as the opposing party side on the axes O direction of opposition side The power of the size of power acts on compression face 52.

Compression face 52 is towards the formation of low-voltage space 44, towards the face of the opposing party side on the axes O direction of convex portion 5. The opposing party side of the compression face 52 on towards low-voltage space 44 to axes O direction is subject to power in the way of being attracted.Present embodiment Compression face 52 be configured to include：The master for being connected and being formed with the end of the opposing party side on the axes O direction of sealing surface 51 receives Pressure surface 521 and the first compression face 522 formed by recess described later 53 and the second compression face 523.

Main compression face 521 is that the end of the opposing party side from the axes O direction of sealing surface 51 is radially oriented inner vertical The face that ground extends.That is, main compression face 521 is the face orthogonal with the outer surface 21 of rotary shaft 2, and towards another on axes O direction One side side.

Recess 53 than sealing surface 51 by radially inner side position at from compression face 52 to axes O direction on a side side it is recessed Fall into.The recess 53 of present embodiment by being recessed from main compression face 521, be consequently formed as compression face 52 a part i.e. with rotation The first orthogonal compression face 522 of the outer surface 21 of rotating shaft 2 and at the position than the first compression face 522 by radial outside with Towards the second compression face 523 that the mode of the outer surface 21 of rotary shaft 2 is formed obliquely.

First compression face 522 is the end of the opposing party side from the axes O direction of the through hole of disk component 31 towards footpath The face for vertically extending laterally.That is, the first compression face 522 is parallel with the back side 311 of main compression face 521 and disk component 31 Formed, and towards the opposing party side on axes O direction.First compression face 522 of present embodiment is formed as, on axes O direction Position become the identical position of the back side 311 with disk component 31.

Second compression face 523 is the face that the first compression face 522 is connected with main compression face 521.Specifically, second is pressurized Face 523 is formed as, with the end of the radial outside from the first compression face 522 be radially oriented outside and towards on axes O direction The opposing party side, and be connected with the end of the radially inner side of main compression face 521.That is, the second compression face 523 is with towards axes O side The opposing party side and the mode of radially inner side upwards is formed obliquely.

Next, being that the effect of centrifugal compressor 1 is illustrated to the rotating machinery of said structure.

In centrifugal compressor as described above 1, the working fluid flowed into from suction inlet 431 is according to being configured at the first order After internal flow path 34, divergent flow path 432, the sequential flowing of return stream 433 of the impeller 3 of the first order of compressor stage 11, According to the internal flow path 34 of the impeller 3 of the second level for being configured at the second compressor stage 12, divergent flow path 432, return stream 433 this The order of sample is while compressed while flowing.Then, the impeller 3 from the most rear class for being configured at level V compressor stage 15 flow to The working fluid F of divergent flow path 432 is via outlet 434 to outside discharge.Working fluid F is according to above-mentioned sequential flowing In way, circulated by the internal flow path 34 in each impeller 3 and compressed.In other words, in the centrifugal compressor of present embodiment In machine 1, working fluid F is periodically compressed using multiple impellers 3, thus obtains larger compression ratio.

According to centrifugal compressor as described above 1, by periodically being pressed working fluid F by multiple impellers 3 Contracting, being fixed in the rotary shaft 2 of impeller 3 via disk component 31 towards the side side on axes O direction thrust is produced.So And, by axes O direction most by the opposing party side most rear class impeller 3 disk component 31 on convex portion 5 is set, using most The impeller 3 of rear class, can make rotary shaft 2 produce following thrust, the thrust towards with produced by the impeller 3 of the first order to the fourth stage The contrary direction of raw thrust is the opposing party side on axes O direction.

Specifically, convex portion 5 is located at low-voltage space 44, and is sealed by sealing surface 51, to avoid the leaf from most rear class The working fluid F of the high pressure that the internal flow path 34 of wheel 3 is discharged spills towards low-voltage space 44.Therefore, using sealing surface 51 as side Boundary, the pressure of the low-voltage space 44 of the opposing party side on axes O direction becomes the impeller 3 than the side side on axes O direction The low pressure in space around.Therefore, it is being made up of the first compression face 522, the second compression face 523 and main compression face 521 Effect on compression face 52 has the pressure lower than cover 33 and the back side 311.Thereby, it is possible to make rotary shaft 2 produce via being provided with convex portion 5 Thrust of the disk component 31 from the impeller 3 of most rear class towards the opposing party side on axes O direction.

As a result, using the impeller 3 of most rear class, impeller 3 of the rotary shaft 2 from the first order to the fourth stage can be weakened and be subject to Thrust.Thereby, it is possible to corrective action in the thrust of rotary shaft 2.Therefore, it is possible to suppress rotary shaft 2 inclined on axes O direction Move.

In addition, for example, as in the present embodiment, it is used for nitric acid plant and as working fluid F in centrifugal compressor 1 And in the case of using nitric acid, when a part for the ammonia used in operation above is flowed in housing stream 43 by mistake, nitric acid Can react with ammonia and generate the ammonium nitrate as solid product.Therefore, using as other components of the ring-type of dummy piston The back side 311 of disk component 31 of the impeller 3 of most rear class is configured at adjusting during the thrust produced by rotary shaft 2, in the work of high pressure When making fluid F inflows, solid product can be deposited in the gap being formed between the back side 311 of disk component 31 and other components In.

Even if here, making the back side 311 of disk component 31 and other components contact can to lead in the way of not forming gap In the case of the state crossed metal contact and seal, because the working fluid F to be flowed into is high pressure, therefore also it is difficult to prevent work Inflows of the fluid F to gap.

However, the thrust produced by rotary shaft 2 is adjusted using the convex portion 5 being integrally formed with disk component 31, thus, it is possible to Make dummy piston substantially integrally formed with disk component 31, it is therefore not necessary to using other components, be prevented from forming unnecessary Gap.

By these modes, the balance of the thrust to form gap and obtain rotary shaft 2 is prevented from.

In addition, being connected by the suction inlet 431 minimum with pressure among housing stream 43 of low-voltage space 44, can make with phase For a side side of the compression face 52 from axes O direction becomes maximum towards the power that the mode of the opposing party's side stretching is acted on.Therefore, Can increase via be provided with the disk component 31 of convex portion 5 from the impeller 3 of most rear class act on rotary shaft 2 towards on axes O direction The opposing party side thrust.Thus, even if the feelings of larger thrust are being produced in rotary shaft 2 by arranging multiple impellers 3 Under condition, it is also possible to which the balance for making the thrust produced by rotary shaft 2 obtains stable.Therefore, it is possible to stably suppress rotary shaft 2 in axle Line O side offsets up.

In addition, forming the position radially of sealing surface 51 according to the side of low-voltage space 44 being axis relative to compression face 52 On O directions the opposing party side effect power size and determine, therefore, in the case where convex portion 5 is merely formed with, convex portion 5 Diametrically formed larger.However, by forming the recess 53 from the depression of compression face 52, the same of compression face 52 can be being formed When prune convex portion 5 wall portion and convex portion 5 is formed less.Therefore, by forming recess 53, can suppress with convex portion 5 The increase of the weight of impeller 3.

In addition, be integrally formed with disk component 31 by convex portion 5, without the need for other components as dummy piston are fixed on into disk The back side 311 of component 31.It is therefore not necessary in order to other components heat is ordinatedly fixed on into rotary shaft 2 and in the appearance of rotary shaft 2 Guarantee space on face 21.As a result, the length on the axes O direction of rotary shaft 2 can be shortened, rotary shaft 2 can be suppressed Vibration.

In addition, by the way that sealing surface 51 is formed parallel to the outer surface 21 of rotary shaft 2, with multiple impellers 3 from In the grade rotating machinery of core type compressor 1, even if rotary shaft 2 produces the extension towards axes O direction, it is also possible to which suppression is affected. For example, sealing surface 51 be formed obliquely or in step-like formation in the case of, because rotary shaft 2 is produced towards axes O direction Extension, thus sealing surface 51 is possible to be contacted with housing 4.As a result, not only damaging sealing, it is also possible to damage rotary shaft 2.However, be formed parallel to the outer surface 21 of rotary shaft 2 by making sealing surface 51, even if in the position of sealing surface 51 along axis In the case that O directions are moved, sealing also will not be contacted and is able to ensure that with housing 4.

More than, embodiments of the present invention have been described in detail referring to the drawings, but each structure in each embodiment And combinations thereof etc. is one, without departing from the scope of spirit of the present invention, adding, omit, putting for structure can be carried out Change and other changes.In addition, the present invention is not limited by embodiment, but only it is defined by technical scheme.

It should be noted that in the present embodiment, to form the first compression face 522 and the second compression face on convex portion 5 523 mode defines recess 53, but is not limited to such construction.For example, with section in semicircle from main compression face 521 The mode of depression forms recess 53, and recess 53 can be arbitrary shape.Alternatively, it is also possible to the not formation recess 53 on convex portion 5 Itself.

In addition, impeller 3 is not limited to be configured with the structure of five as the centrifugal compressor 1 of present embodiment. It is for instance possible to use the structure fewer than level Four, it would however also be possible to employ more than six grades of structure.

Industrial applicibility

According to above-mentioned rotating machinery, using the convex portion 5 being integrally formed with disk component 31, it is prevented from producing gap, and And can obtain the balance of the thrust for acting on rotary shaft 2.

Description of reference numerals：

O axis；

F working fluids；

1 centrifugal compressor；

2 rotary shafts；

21 outer surfaces；

3 impellers；

31 disk components；

311 back sides；

32 blades；

33 covers；

34 internal flow paths；

5 convex portions；

51 sealing surfaces；

51a labyrinths；

52 compression faces；

521 main compression faces；

522 first compression faces；

523 second compression faces；

53 recesses；

4 housings；

41 bearings of journals；

42 thrust bearings；

43 housing streams；

431 suction inlets；

432 divergent flow paths；

433 return stream；

434 outlets；

44 low-voltage spaces.

Claims (4)

1. a kind of rotating machinery, wherein,

The rotating machinery possesses：

Rotary shaft, it is pivoted about with axis；

Impeller, it has the disk component rotated together with the rotary shaft, and is formed with the axis side for making to extend from the axis The working fluid of side's side inflow upwards is radially oriented the internal flow path that outside is discharged, and on the axis direction side by side Be configured with multiple；And

Housing, it is formed with housing stream, and the housing stream makes the working fluid from be configured on the axis direction The impeller of square side to the impeller adjoined in the opposing party side circulates,

In the multiple impellers, impeller of the opposing party side that most leans at least being configured on the axis direction has convex portion,

The convex portion is configured in the space with the upstream side communication of the housing stream, and with from described in the direction of the disk component The mode that the back side of the opposing party side on axis direction projects is integrally formed with the disk component,

The convex portion has：

Sealing surface, it is formed parallel to the outer surface of the rotary shaft, and to the radial direction between the convex portion and the housing On gap sealed；And

Compression face, it extends to the sealing surface from the outer surface of the rotary shaft.

2. rotating machinery according to claim 1, wherein,

The housing is formed with the suction inlet for making the working fluid flow into externally to the housing stream, the suction inlet with The space connection.

3. rotating machinery according to claim 1 and 2, wherein,

The convex portion has recess at the position than the sealing surface by radially inner side, and the recess is from the compression face towards institute State the side side depression on axis direction.

4. a kind of impeller, is the impeller arranged in rotating machinery,

The rotating machinery possesses：

Rotary shaft, it is pivoted about with axis；

Multiple impellers, they have the disk component that rotates together with the rotary shaft, and are formed with and make what is extended from the axis The working fluid of the side's side inflow on axis direction is radially oriented the internal flow path that outside is discharged, and in the axis direction On be abreast configured with multiple；And

Housing, it is formed with housing stream, and the housing stream makes the working fluid from be configured on the axis direction The impeller of square side to the impeller adjoined in the opposing party side circulates,

The impeller is configured on the axis direction of rotating machinery and most leans on the opposing party side,

Wherein,

The impeller has convex portion,

The convex portion in the way of the back side of the opposing party side from the direction axis direction of the disk component projects with it is described Disk component is integrally formed, and is configured in the space with the upstream side communication of the housing stream,

The convex portion has：

Sealing surface, it is formed parallel to the outer surface of the rotary shaft, and to the radial direction between the convex portion and the housing On gap sealed；And

Compression face, it extends to the sealing surface from the outer surface of the rotary shaft.