CN206144603U - Helical coiled passage formula steam turbine and steam turbine device - Google Patents

Abstract

The utility model provides a helical coiled passage formula steam turbine and steam turbine device relates to steam turbine technical field, including cavity of the inside formation of steam turbine casing, the rotation axis pivot is adorned in the steam turbine casing and the rotation axis runs through the steam turbine casing, spiral rotor be located the cavity, and with the rotation axis rigid coupling, bottom plate and spiral rotor seal with the rotor protective layer cooperation and form the one end opening, and wrap up in the sleeve in the spiral rotor outside, and spiral rotor and sleeve cooperation form helical coiled passage, and along the axial lead of rotation axis, helical coiled passage includes first end and second end, and along the nearly bottom plate of the first termination of axial lead direction of rotation axis, the bottom plate is kept away from to the second end, and follow first hold the second proper to, helical coiled passage unit length's volume is crescent, be equipped with steam flow path on the rotation axis, steam exhausting pipeline sets up on the steam turbine casing. The air passage structure of this helical coiled passage formula turbine is more simple, the whole structure more simplifies, the performance is more lasting.

Description

Screw path type steam turbine and steam turbine equipment

Technical field

This utility model is related to steam turbine technology field, sets more particularly, to a kind of screw path type steam turbine and steam turbine It is standby.

Background technology

Steam turbine can be used as prime mover of generating, can also directly drive various pumps, blower fan, compressor and ship spiral shell Rotation oar etc., it may also be used for low boiling working fluid turbine system.During electric energy is produced, the steaming that steam turbine comes boiler transmission The energy of vapour is converted into the rotary power of mechanical work, is generated electricity by the electromotor being connected.

But traditional steam turbine that power plant is used, volume is heavy, complex structure involves great expense.For example, power plant is used Traditional steam turbine, including rotating part and stationary part are in two sub-sections.Stationary part also known as stator, stator by enter vapour part, The structure composition such as cylinder, dividing plate and static cascade, packing and bearing.Cylinder in stationary part is the shell of steam turbine, and it is by vapour The flow passage component of turbine separates with air, forms the steam chest of steam turbine inside closing, it is ensured that steam completes energy inside steam turbine The transformation process of amount.The parts such as nozzle box, dividing plate, diaphragm housing ring are installed in cylinder；It is connected to outside cylinder into vapour, steam discharge, takes out The pipelines such as vapour., also known as rotor, rotor is by structure compositions such as main shaft, impeller, movable vane piece and shaft couplings for rotating part.Therefrom can see Go out the complex structure of traditional steam turbine.

Additionally, the height of cylinder, intermediate pressure section are typically formed using very thick steel alloy or cast carbon steel, complex process cost , there is inequality of the being heated drawback that cylinder body can be caused to be easily deformed etc. in height；Rotor is typically formed using alloy steel forging overall processing, Rotor after processing is needed by further polish and it is necessary in all of blade of fit on, carries out rotating test at full speed Could be arranged on steam turbine with after accurate dynamic balancing；The parts such as rotor bushing, impeller, axle envelope set, shaft coupling are all difference After processing, hot jacket adopts interference fit on notch cuttype main shaft between each part and main shaft, in case uppermost leaf wheel etc. is because of centrifugation Power and action of thermal difference cause loosening, and transmit torque with key；Forging is big, and processing technique has high demands, and the process-cycle is long, and forges greatly Part difficult quality guarantee.It can be seen that the manufacturing process of traditional steam turbine and assembly technology complexity, assembly precision have high demands.

In addition, when steam turbine works, high steam and each grade blade of steam turbine of entrance, are all perpendicular contacts, Especially last stage vane of steam turbine, the linear velocity of outer blade diameter is very high.If having water droplet composition in steam, water droplet vertical direction toward impact Last stage vane of steam turbine, huge linear velocity and vertical direction toward impact, it is more likely that cause last stage vane of steam turbine fatigue even to damage. If the vertical speed of steam carries the materials such as rust, iron ore and incrustation scale, enter in steam turbine and vertical direction toward impact blade, The damage of blade will be caused, the exhaust stage blade for especially rotating at a high speed.If broken blade is high back and forth in cylinder of steam turbine body Speed is clashed into, and this very likely results in the whole machine of steam turbine and scraps, or even even more serious accident occurs.There it can be seen that traditional Steam turbine maintenance in use and maintenance procedures are complex, relatively costly and exhaust stage blade is fragile.

Traditional steam turbine due to the requirement to gas circulation passage, cause complicated integral structure, assembly precision to have high demands, The problem that maintenance and maintenance procedures are complex, manufacturing cost is high in use.Therefore need to provide a kind of air flue more simple The single, steam turbine that structure is more simplified, performance is more lasting.

Utility model content

The purpose of this utility model is to provide a kind of screw path type steam turbine and steam turbine equipment, to solve existing vapour Turbine complex structure, manufacturing process are complicated, assembly technology has high demands, maintenance procedures are complicated and last stage vane of steam turbine is easily damaged Bad technical problem.The spiral channel formula steam turbine is mainly used as prime mover of generating, also can directly drive various pumps, blower fan, Compressor and propeller for vessels etc., it may also be used for low boiling working fluid turbine system.

In a first aspect, this utility model provides a kind of screw path type steam turbine, including：Steam turbine shell, rotary shaft, spiral shell Gyrator, base plate, helical rotor sealing and rotor protection layer and blow-off line, wherein：

The steam turbine shell is internally formed a cavity；The rotary shaft is installed in the steam turbine shell and institute Rotary shaft is stated through the steam turbine shell；The helical rotor is located in the cavity and affixed with the rotary shaft；It is described Base plate is sealed with the helical rotor and rotor protection layer cooperatively forms one end open and is wrapped on the outside of the helical rotor Sleeve, the helical rotor cooperatively forms helical duct with the sleeve, and along the axial line of the rotary shaft, the spiral leads to Road includes first end and the second end, first end described in the direction of axis line along the rotary shaft near the base plate, described second End is away from the base plate, and along the first end to second extreme direction, the volume of the helical duct unit length is gradually Increase；The rotary shaft is provided with steam channel, the steam channel one end open on the end face of the rotary shaft, the other end It is open in the original position of the first end；

The blow-off line is arranged on the steam turbine shell, positioned at the exit position at second end, for by institute The gas for stating helical duct discharge is discharged.

Further, the ring road of the helical duct gradually increases along the first end to the size of second extreme direction Greatly.

Further, the helical rotor is multistage, and from the base plate length direction along the rotary shaft is started, latter Blade of the blade radius of the helical rotor of level more than helical rotor described in previous stage.

Further, also include for the steam inlet pipe road of the helical duct steam supply, the steam inlet pipe road and the rotation Docking is formed at the end face opening of rotating shaft.

Further, the steam turbine shell includes base and upper lid, and the base is with the upper lid with integral type knot Structure；Or,

The base is detachably connected with the upper lid.

Further, the rotary shaft is provided with bearing with the steam turbine shell junction, is provided with the base For fixing the bearing block of the bearing.

Further, the steam inlet pipe road and the rotation shaft connection place be provided with for prevent junction leakage vapour first Axle envelope, and first axle envelope has integral structure with the steam inlet pipe road；The one end of the rotary shaft away from the base plate It is provided with the second axle envelope for preventing gas from discharging with the rotation shaft connection place from the bearing.

Further, the rotary shaft is provided with thrust bearing away from the tail end of the one end in the steam inlet pipe road, described to stop Thrust bearing is used to limit the axial location of the rotary shaft.

Further, also including Temperature-controlled appliance and pressure control equipment, the Temperature-controlled appliance is used to detect institute The temperature height in cavity is stated, the pressure control equipment is used to detect the pressure size in the cavity.

Second aspect, this utility model also provides a kind of steam turbine equipment, including appointing for proposing in such as above-mentioned technical scheme A kind of screw path type steam turbine.

The screw path type steam turbine and steam turbine equipment that this utility model is provided can produce following beneficial effect：

This utility model provides a kind of screw path type steam turbine, including：Steam turbine shell, rotary shaft, helical rotor, bottom Plate, helical rotor sealing and rotor protection layer and blow-off line, wherein：Steam turbine shell is internally formed a cavity；Rotary shaft It is installed in steam turbine shell and rotary shaft runs through steam turbine shell；Helical rotor is within the cavity and affixed with rotary shaft； Base plate is sealed with helical rotor and rotor protection layer cooperatively forms one end open and is wrapped in the sleeve on the outside of helical rotor, spiral shell Gyrator cooperatively forms helical duct with sleeve, and along the axial line of rotary shaft, helical duct includes first end and the second end, edge The close base plate of direction of axis line first end of rotary shaft, away from base plate, and along first end to the second extreme direction, spiral leads at the second end The volume of road unit length gradually increases；Rotary shaft is provided with steam channel, end face of the steam channel one end open in rotary shaft On, original position of another end opening in first end；Blow-off line is arranged on steam turbine shell, positioned at the outlet position at the second end Put, the gas for helical duct to be discharged is discharged.When using, opening of the steam from rotation axial end enters and flows through steaming Vapour passage enters the original position of the first end of helical duct；Because helical duct one end has base plate to stop, steam be merely able to from The other end is gone out, and the volume of helical duct unit length gradually increases, and flows into the steam of first end along helical duct stream It is dynamic, pressure release step by step, and promote helical rotor to rotate；The rotary shaft affixed with it is driven to rotate while helical rotor is rotated, rotation The outfan output kinetic energy of rotating shaft, drives gen-set to generate electricity and exports or drive other devices.The spiral shell that this utility model is provided Not only complete machine structure is simple for rotation channel-type steam turbine, small volume, light weight, maintenance and maintenance operation is simple, assembling and manufacture work Skill is simple, and steam flows along helical duct, and exhaust stage blade is hardly damaged, helical rotor long service life, so as to this practicality The screw path type steam turbine long service life of new offer.

Description of the drawings

In order to be illustrated more clearly that this utility model specific embodiment or technical scheme of the prior art, below will be right The accompanying drawing to be used needed for specific embodiment is briefly described, it should be apparent that, drawings in the following description are this realities With some new embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, go back Other accompanying drawings can be obtained according to these accompanying drawings.

Single step helical rotor in screw path type steam turbine that Fig. 1 is provided for this utility model embodiment and steam turbine equipment Structural representation；

Fig. 2 shows for the screw path type steam turbine structure for being provided with single step helical rotor that this utility model embodiment is provided It is intended to；

Two-stage screw rotor in screw path type steam turbine that Fig. 3 is provided for this utility model embodiment and steam turbine equipment Structural representation；

Fig. 4 shows for the screw path type steam turbine structure for being provided with two-stage screw rotor that this utility model embodiment is provided It is intended to.

Icon：Cover on 101-；102- bases；2- rotary shafts；201- steam channels；3- helical rotors；301- One end；The ends of 302- second；4- base plates；5- helical rotors are sealed and rotor protection layer；6- blow-off lines；7- steam inlet pipes road； 8- bearings；9- bearing blocks；The axle envelopes of 10- first；The axle envelopes of 11- second；12- thrust bearings.

Specific embodiment

The technical solution of the utility model is clearly and completely described below in conjunction with accompanying drawing, it is clear that described Embodiment is a part of embodiment of this utility model, rather than the embodiment of whole.Based on the embodiment in this utility model, this The every other embodiment that field those of ordinary skill is obtained under the premise of creative work is not made, belongs to this practicality Novel protected scope.

In description of the present utility model, it should be noted that term " " center ", " on ", D score, "left", "right", " perpendicular Directly ", the orientation or position relationship of the instruction such as " level ", " interior ", " outward " is, based on orientation shown in the drawings or position relationship, to be only For the ease of describe this utility model and simplify description, rather than indicate or imply indication device or element must have it is specific Orientation, with specific azimuth configuration and operation, therefore it is not intended that to restriction of the present utility model.Additionally, term " the One ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that indicating or implying relative importance.

In description of the present utility model, it should be noted that unless otherwise clearly defined and limited, term " peace Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected, or be detachably connected, or integratedly Connection；Can be mechanically connected, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, It can be the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition Concrete meaning of the language in this utility model.

Specific embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.It should be appreciated that herein Described specific embodiment is merely to illustrate and explains this utility model, is not limited to this utility model.

Steam turbine is requisite device in steam turbine equipment.Steam turbine can be used as prime mover of generating, Various pumps, blower fan, compressor and propeller for vessels etc. can be directly driven, it may also be used for low boiling working fluid turbine system.Generate electricity Boiler produces steam by burning fuel in system, steam is entered in the air flue of steam turbine by pipeline, and driving steam turbine turns Son is rotated, and turbine rotor drives coupled rotary shaft 2 to rotate after rotating, and the outfan of rotary shaft 2 is connected with electromotor, Electrical power generators are driven, electric power output is carried out.During electricity generation system is powered, steam turbine serves vital work With the energy of steam is converted into steam turbine the rotary power of output shaft, drives generator powered.

Additionally, steam turbine can directly drive various pumps, blower fan, compressor and ship spiral by the outfan of its rotary shaft Oar etc., it may also be used for low boiling working fluid turbine system.

This utility model provides a kind of steam turbine equipment, including any one screw path type proposed in technical scheme below Steam turbine.

As shown in Figure 1-2, this utility model provides a kind of screw path type steam turbine, including：Steam turbine shell, rotation Axle 2, helical rotor 3, the sealing of base plate 4, helical rotor and rotor protection layer 5 and blow-off line 6, wherein：

Steam turbine shell is internally formed a cavity；Rotary shaft 2 is installed in steam turbine shell and rotary shaft 2 runs through vapour Turbine housing；Helical rotor 3 is within the cavity and affixed with rotary shaft 2；Base plate 4 is sealed and rotor protection layer 5 with helical rotor Cooperatively form one end open and be wrapped in the sleeve in the outside of helical rotor 3, helical rotor 3 cooperatively forms helical duct with sleeve, And along the axial line of rotary shaft 2, helical duct includes the end 302 of first end 301 and second, along the direction of axis line the of rotary shaft 2 One end 301 near base plate 4, the second end 302 away from base plate 4, and along the direction of the end of first end 301 to the second 302, helical duct unit The volume of length gradually increases；Rotary shaft 2 is provided with steam channel 201, and the one end open of steam channel 201 is at the end of rotary shaft 2 On face, original position of another end opening in first end 301；

Blow-off line 6 is arranged on steam turbine shell, positioned at the exit position of the second end 302, for helical duct to be discharged Gas discharge.

Specifically, when using, opening of the steam from the end face of rotary shaft 2 is entered and flows through steam channel 201 and enter spiral The original position of the first end 301 of passage；Because helical duct one end has base plate 4 to stop, steam is merely able to from the other end go out, And the volume of helical duct unit length gradually increases, the steam for flowing into first end 301 flows along helical duct, lets out step by step Pressure, and promote helical rotor 3 to rotate；The rotary shaft 2 affixed with it is driven to rotate while helical rotor 3 is rotated, rotary shaft 2 Outfan output kinetic energy, drives gen-set to generate electricity and exports or drive other devices.The helical duct that this utility model is provided Not only complete machine structure is simple for formula steam turbine, small volume, light weight, maintenance and maintenance operation is simple, assembling and manufacturing process simply, And steam flows along helical duct, exhaust stage blade is hardly damaged, the long service life of helical rotor 3, so as to this utility model is carried For screw path type steam turbine long service life.

It should be noted that because helical duct is by base plate 4 and helical rotor are sealed and rotor protection layer 5 is formed one end The sleeve parcel of opening, and helical rotor 3 and sleeve cooperatively form helical duct, from steam channel 201 helical duct the is entered The high steam of one end 301, can only be flowed along helical duct from first end 301 to the direction of the second end 302.Because along first end The direction of 301 to the second end 302, the volume of helical duct unit length gradually increases, and high steam is flowing to by first end 301 Gradually pressure release forms exhaust steam during two ends 302, and in this process steam does work to helical rotor 3, promotes it to rotate； Exhaust steam after final pressure release is flowed out from the opening at the second end 302, fills the inside cavity that steam turbine shell is formed.In order to protect The safety of card steam turbine, is provided with discharge duct on steam turbine shell, and the exhaust steam after pressure release is discharged by discharge line The inside of cavity.

It should be noted that high steam is entered into after the first end 301 of helical duct, along the rotation rail of helical duct Road is flowed, pressure release step by step, even if high steam the inside is mingled with for example, the foreign body such as water droplet, rust, iron ore and incrustation scale is entered To in the helical duct of screw path type steam turbine, also can discharge along helical duct, will not cause larger to helical rotor 3 Injury.The long service life of helical rotor 3 of the screw path type steam turbine that this utility model is provided.

Because high steam enters into the first end 301 of helical duct by steam channel 201, so first end 301 is Higher-pressure region；Because along the direction of the end of first end 301 to the second 302, the volume of helical duct unit length gradually increases, high steam The gradually pressure release during the second end 302 is flowed to by first end 301, so the second end 302 is low-pressure area.

In addition, the sleeve that base plate 4 is sealed with helical rotor and rotor protection layer 5 is formed and helical rotor 3 and the phase of rotary shaft 2 Mutually coordinate, will be closed in helical duct into the high-temperature steam of higher-pressure region so as to can only flow along helical duct and not occur The gas at other positions is revealed, and base plate 4 and helical rotor sealing and rotor protection layer 5 need to bear high steam and be applied to it Power effect.Based on this, the material for choosing base plate 4 with helical rotor sealing and rotor protection layer 5 is steel alloy, and to the two Carry out thickening process, the big I of specific thickness is set according to the maximum pressure of the high steam into steam turbine.It is preferred that Ground, it is double-decker to choose base plate 4 with helical rotor sealing and rotor protection layer 5.

In addition, helical rotor sealing and rotor protection layer 5 can be two-layer, one layer is for the adjacent of enclosing coil rotor 3 To form the sealing of helical duct, one layer to wrap the knots formed with the blade of helical rotor 3 in some sealings for the side of two blades Shell body on the outside of structure, the shell body cooperatively forms one end open and is wrapped in the sleeve in the outside of helical rotor 3 with base plate 4.

In order that entering the high steam of first end 301 along the side of the end of first end 301 to the second 302 by steam channel 201 To movement, the volume of helical duct unit length gradually increases.

The method that the volume of helical duct unit length increases is set to be that the ring road of helical duct is along first end 301 to the second The size for holding 302 directions gradually increases.

Specifically, as shown in Figure 1-2, high steam enters into helical duct by the steam channel 201 in rotary shaft 2 First end 301, all of high steam is all sealed in helical duct, and high steam acts on power on helical rotor 3. The pressure that helical rotor 3 bears is equal to the product of pressure and lifting surface area, due to first end 301 be higher-pressure region ring road area it is non- Often little, so lifting surface area is very little, therefore the pressure that helical rotor 3 bears at this is just smaller；Afterwards, high steam is along spiral shell Passage constantly allowance for expansion is revolved, pressure and energy is constantly done work and consume；Through tens grades of even more spiral channels simultaneously Along with the continuous decay of energy, finally the exhaust steam without pressure is discharged from the tail end at the second end 302 of helical duct；Steam turbine Blow-off line 6 on housing discharges the exhaust steam in cavity so as to enters into condenser and is condensed, carries out the profit of after-heat With, and reduction becomes condensed water and continues cycling through and use.

Although along the direction of the end of first end 301 to the second 302, the ring road size of helical duct gradually increases and can increase spiral The volume of passage unit length, but the method is not unlimited.If the method for selection increase ring road size simply is come The volume of the unit length of increase helical duct, the length of the rotary shaft 2 affixed with helical rotor 3 will be made thin long, the shape Not only the intensity of rotary shaft 2 need to be improved much with rigidity requirement under state, and the size of whole machine is very big.

Therefore in order to further optimize the screw path type steam turbine of this utility model offer so as to adapt to high-power state Under use demand.As shown in Figure 3-4, helical rotor 3 is set to multistage, and from base plate 4 length direction along rotary shaft 2 is started, Blade of the blade radius of the helical rotor 3 of rear stage more than previous stage helical rotor 3.

Helical rotor 3 can be chosen for two-stage, previous stage helical rotor 3 and sleeve and the composition high pressure cylinder of rotary shaft 2, rear stage Helical rotor 3 and partial sleeves and the composition low pressure (LP) cylinder of rotary shaft 2；Or, helical rotor 3 can be chosen for three-level even more stages. Specifically, the blade of rear stage helical rotor 3 has integral structure with the blade of previous stage helical rotor 3, and the two formation is whole Individual helical rotor 3.The ring road size of the helical duct that the blade of rear stage helical rotor 3 is formed is also in compliance with upper level helical rotor The ring road size variation rule of the helical duct that 3 blade is formed, i.e., the ring road of helical duct is along the end of first end 301 to the second The size in 302 directions gradually increases.But the size of the initial ring road that rear stage helical rotor 3 is formed, need to be according to previous stage spiral shell The radius of the blade of the volume and rear stage helical rotor 3 of the tail end ring road that gyrator 3 is formed determines after being calculated.

It should be noted that the blade angle of helical rotor 3 can affect flowing velocity of the steam in helical duct.In phase In isostructural steam turbine, only change the blade angle of helical rotor 3, when the blade and the centrage of rotary shaft 2 of helical rotor 3 Vertical direction angle it is big when, gas is fast by the speed of helical duct；Blade and the center of rotary shaft 2 when helical rotor 3 The vertical direction angle hour of line, gas is slow by the speed of helical duct.

Further, since helical rotor 3 needs to contact high steam, and the core missions of whole steam turbine are performed, choose spiral shell The material of gyrator 3 is superior alloy steel.The helical rotor 3 of steam turbine is generally more than tens circles, and each of which blade is solely subjected to Pressure differential in helical duct in front and back, so need not be very thick.But when designing and manufacturing helical rotor 3 it is considered as far as possible Surplus thickness, it is ensured that steam turbine spiral channel pressure, can control completely in the range of being perfectly safe.Strive for accomplish whole Turbine rotor disposably puts into, and spiral channel need not again be opened and overhauled.

The screw path type steam turbine that this utility model is provided also includes for the steam inlet pipe road 7 of helical duct steam supply, Dock with being formed at the end face opening of rotary shaft 2 in steam inlet pipe road 7.

Specifically, steam inlet pipe road 7 is connected with the opening of steam channel 201 on the end face of rotary shaft 2, from the high pressure that boiler is discharged Steam passes sequentially through steam inlet pipe road 7 and steam channel 201, enters into the first end 301 of helical duct.

In addition, steam turbine shell includes base 102 and upper lid 101, base 102 has integral structure with upper lid 101；Or Person,

Base 102 is detachably connected with upper lid 101.

And specifically, it is preferable to the base 102 of steam turbine shell is demountable structure with upper lid 101.Base 102 and upper lid 101 Demountable structure, be easy to screw path type steam turbine manufacture, assembling and safeguard.Because rotary shaft 2 is positioned over base 102 On, and the structures such as helical rotor 3, the sealing of base plate 4, helical rotor and rotor protection layer 5, overall weight are connected with rotary shaft 2 Larger, base 102 needs to choose stability and safety of the thicker steel alloy to meet whole screw path type steam turbine.But Because the weight in rotary shaft 2 is less than the weight in traditional steam turbine rotary shaft 2, the screw path type vapour that this utility model is provided Base 102 thickness of the thickness of base 102 of turbine much smaller than traditional steam turbine.

Additionally, because upper lid 101 and the interior exhaust steam for after pressure release of cavity that base 102 is formed, upper lid 101 and base 102 do not contact with high steam, and institute's above lid 101 is from general steel or steel alloy, and the thickness of upper lid 101 can The thickness of upper lid 101 of far smaller than traditional steam turbine.In a word to sum up, compared with traditional steam turbine, this utility model is carried For screw path type steam turbine need not possess the very thick steel alloy cylinder block of traditional steam turbine, the spiral shell that this utility model is provided The weight and cost of rotation channel-type steam turbine can be reduced a lot.

Further, since the rotation of the high speed under the drive of helical rotor 3 of rotary shaft 2, rotary shaft 2 and steam turbine shell pivot dress Place is susceptible to abrasion, so installing bearing 8 in rotary shaft 2 and steam turbine shell junction, is provided for fixing on base 102 The bearing block 9 of bearing 8.Bearing block 9 and base 102 can be integral type structure.

In addition, in order to the high steam for preventing boiler from discharging is revealed in steam inlet pipe road 7 with the junction of rotary shaft 2, The position is provided with the first axle envelope 10 for preventing junction from leaking vapour, and the first axle envelope 10 has integral type with steam inlet pipe road 7 Structure, prevents the leakage of high steam；Additionally, in order to the exhaust steam in the cavity for preventing steam turbine shell formation is revealed, and it is inconvenient Carry out the discharge of exhaust steam and utilize in blow-off line 6, rotary shaft 2 away from one end of base plate 4 be provided with for prevent gas from The second axle envelope 11 that bearing 8 is discharged with the junction of rotary shaft 2.

In addition, in order to prevent rotary shaft 2 when rotating, there is rocking along centerline direction, rotary shaft 2 is away from steam inlet pipe The tail end of the one end in road 7 is provided with thrust bearing 12, and thrust bearing 12 is used to limit the axial location of rotary shaft 2, so as to limit There is no axially and radially displacement in helical rotor 3.

The screw path type steam turbine that this utility model is provided also includes Temperature-controlled appliance and pressure control equipment, temperature The temperature height that control device is used in test chamber, the pressure size that pressure control equipment is used in test chamber.Temperature control Control equipment and pressure control equipment can protect screw path type steam turbine equipment to carry out long-term and stable operating.

Finally it should be noted that：Various embodiments above is only illustrating the technical solution of the utility model, rather than it is limited System；Although being described in detail to this utility model with reference to foregoing embodiments, one of ordinary skill in the art should Understand：It still can modify to the technical scheme described in foregoing embodiments, either to which part or whole Technical characteristic carries out equivalent；And these are changed or are replaced, the essence for not making appropriate technical solution departs from this practicality newly The scope of each embodiment technical scheme of type.

Claims (10)

1. a kind of screw path type steam turbine, it is characterised in that include：Steam turbine shell, rotary shaft, helical rotor, base plate, spiral shell Gyrator is sealed and rotor protection layer and blow-off line, wherein：

The steam turbine shell is internally formed a cavity；The rotary shaft is installed in the steam turbine shell and the rotation Rotating shaft runs through the steam turbine shell；The helical rotor is located in the cavity and affixed with the rotary shaft；The base plate One end open and the set being wrapped on the outside of the helical rotor are cooperatively formed with helical rotor sealing and rotor protection layer Cylinder, the helical rotor cooperatively forms helical duct with the sleeve, and along the axial line of the rotary shaft, the helical duct Including first end and the second end, first end described in the direction of axis line along the rotary shaft is near the base plate, second end Away from the base plate, and along the first end to second extreme direction, the volume of the helical duct unit length gradually increases Greatly；The rotary shaft is provided with steam channel, and the steam channel one end open on the end face of the rotary shaft, open by the other end Original position of the mouth in the first end；

The blow-off line is arranged on the steam turbine shell, positioned at the exit position at second end, for by the spiral shell The gas that rotation passage is discharged is discharged.

2. screw path type steam turbine according to claim 1, it is characterised in that the ring road of the helical duct is along described First end to the size of second extreme direction gradually increases.

3. screw path type steam turbine according to claim 2, it is characterised in that the helical rotor is multistage, from institute The length direction that base plate starts along the rotary shaft is stated, the blade radius of the helical rotor of rear stage are more than described in previous stage The blade of helical rotor.

4. screw path type steam turbine according to claim 1, it is characterised in that also include for the helical duct Dock with being formed at the end face opening of the rotary shaft in the steam inlet pipe road of steam supply, the steam inlet pipe road.

5. screw path type steam turbine according to claim 4, it is characterised in that the steam turbine shell include base and Upper lid, the base has integral structure with the upper lid；Or,

The base is detachably connected with the upper lid.

6. screw path type steam turbine according to claim 5, it is characterised in that the rotary shaft and the steamer casing Body junction is provided with bearing, and the bearing block for fixing the bearing is provided with the base.

7. screw path type steam turbine according to claim 6, it is characterised in that the steam inlet pipe road and the rotary shaft Junction is provided with the first axle envelope for preventing junction from leaking vapour, and first axle envelope has one with the steam inlet pipe road Formula structure；The rotary shaft is provided with for preventing gas from connecting with the rotary shaft from the bearing away from one end of the base plate Connect the second axle envelope that place discharges.

8. screw path type steam turbine according to claim 7, it is characterised in that the rotary shaft is away from the steam inlet pipe The tail end of the one end in road is provided with thrust bearing, and the thrust bearing is used to limit the axial location of the rotary shaft.

9. the screw path type steam turbine according to any one of claim 1-8, it is characterised in that also including temperature control Control equipment and pressure control equipment, the Temperature-controlled appliance is used to detect the temperature height in the cavity, the pressure control Control equipment is used to detect the pressure size in the cavity.

10. a kind of steam turbine equipment, it is characterised in that include the screw path type vapour as described in any one of claim 1-9 Wheel.