CN201396193Y

CN201396193Y - Steam turbine

Info

Publication number: CN201396193Y
Application number: CN2009200214664U
Authority: CN
Inventors: 刘传湖
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-04-24
Filing date: 2009-04-24
Publication date: 2010-02-03
Anticipated expiration: 2019-04-24

Abstract

The utility model relates to a motive power device using steam as the motive power, in particular to a steam turbine which comprises a case, a main shaft and impellers, wherein the main shaft and theimpellers are positioned in the case; at least one group of impellers are arranged in the case; the outer side of each group of impellers is correspondingly provided with a group of spray nozzle brackets; the side surfaces of the spray nozzle brackets are provided with a plurality of tangential direction entering spray nozzles; at least one spiral steam inlet passage is arranged in the impellers;at least one blade is arranged inside the spiral steam inlet passage; a plurality of steam holes are formed on the blade; the periphery of the blade is fixedly connected with the inner wall of the steam inlet passage; the main shaft is a hollow shaft; and steam outlets corresponding to the steam inlet passages are formed on the main shaft. In the steam turbine, the capability of the blade for resisting multiple vibration frequencies is greatly improved. The problem of disengagement of the blade is avoided.

Description

A kind of steam turbine

Technical field:

The utility model relates to a kind of is the power plant of power with steam, relates in particular to a kind of steam turbine.

Background technique:

The structure of existing steam turbine generally adopts and adorn a rotor in housing, on the main shaft of rotor blade is housed, and the inject high pressure gas in housing of the nozzle on the housing blows blade, thereby drives rotor rotation.But there is following shortcoming in the steam turbine of this structure: the diameter of (1) blade is bigger, and when steam flow pressure changed and surpass the limiting value that blade bears, judder will take place blade, occurs falling the leaf phenomenon easily; (2) for preventing in the working procedure owing to reasons such as expansion, center of circle deflection, friction are stuck blade, need between the tip of blade and housing, to leave certain clearance, at this moment, just have a large amount of steam to flow away from the gap, cause the invalid loss of energy; (3) impact the condensed water that produces in the multistage blade process at steam flow, general condensed water importing next stage or the stage further that adopts the high vapour pressure level makes its vaporization, still, is accompanied by the invalid loss of a large amount of gases in this process; (4) owing to be subjected to the influence of factors such as space, rotating speed, friction and invalid heating power loss, can't realize the multistage extraction of energy; (5) diameter of steam turbine afterbody blade is greater than the diameter of intermediate blade, so must could do work to the blade of afterbody with stronger steam flow, steam flow just is discharged from after big blade is done work, and has caused the waste of energy, has reduced energy utilization ratio.It is exactly the existing in prior technology deficiency.

Summary of the invention:

The purpose of this utility model is exactly at the existing in prior technology deficiency, and the steam turbine that provides a kind of periphery that can realize blade to fixedly connected with housing, and what this steam turbine had been avoided blade falls the leaf problem, and blade is resisted the multiple ability frequently of shaking and improved.

This programme is realized by following technical measures: this steam turbine comprises housing and is positioned at the main shaft and the impeller of housing, at least be provided with one group of impeller in the described housing, the impeller outer side ring is wound with nozzle holder, at least be provided with a spiral admission passage in the described impeller, admission passage internal fixation is connected with the blade of the logical steam vent of band, described main shaft is a hollow shaft, and main shaft is provided with the steam ouput corresponding with the admission passage.

Above-mentioned spirality admission channel interior is provided with a blade at least, and the periphery of blade is fixedlyed connected with the inwall of admission passage, and this structure has greatly improved blade and resisted the multiple ability frequently of shaking, and the phenomenon of leaf can not occur falling, and the invalid loss of noenergy.

Above-mentioned every group of impeller outside correspondence has one group of nozzle holder, and the side of nozzle holder is provided with some nozzles that tangentially enter, and steam inlet can enter the admission passage to greatest extent after the high pressure gas is sprayed by nozzle blade is done work along the tangential setting of impeller.

The steam inlet end of above-mentioned admission passage and the cross-section area of steam ouput end are less than the cross-section area of admission channel middle, this structure, can make steam turbine carry out low-speed running on the one hand, on the other hand, make the pressure difference between the blade of steam ouput end in the admission passage can not be reduced to zero apace, can keep certain pressure difference between each blade, thereby improve the efficient that energy cascade utilizes.

All blades in the above-mentioned admission passage are arranged along the diametric(al) of housing, blade is provided with some logical steam vents, certain pressure difference is arranged between each blade, the gas pressure that all blades are subjected to is all on same stressed circle, promote all pressure with joint efforts the wheel rotation acting, improved energy utilization ratio.

The beneficial effect of this programme can be learnt according to the narration to such scheme, is provided with one group of impeller in the housing of this steam turbine at least, and every group of impeller outer side ring is wound with one group of nozzle holder corresponding with it, and this packet type structure is convenient to the I﹠M of steam turbine; At least be provided with a spiral admission passage in the described impeller, adopt spirality admission passage to reduce the weight and the occupation of land space of steam turbine effectively, admission passage internal fixation is connected with the blade of the logical steam vent of band, described main shaft is a hollow shaft, and main shaft is provided with the steam ouput corresponding with the admission passage.Blade in the steam turbine of this structure periphery is connected fully with the inwall of spirality admission passage, and when steam flow pressure changed, the resistance ability of blade was greatly improved, and that has avoided blade falls the leaf phenomenon.This shows that the utility model compared with prior art has substantive distinguishing features and progress, the beneficial effect of its enforcement also is conspicuous.

Description of drawings:

Fig. 1 is the partial sectional view of the utility model embodiment.

Fig. 2 be among Fig. 1 A-A to sectional view.

Fig. 3 is the structural representation of parts 9 blades among Fig. 2.

Among the figure, 1 is nozzle holder, and 2 is nozzle, and 3 is jet chamber, and 4 is steam inlet, and 5 is housing, and 6 is main shaft, and 7 is impeller, and 8 is steam ouput, and 9 is blade, and 10 are the admission passage, and 11 are logical steam vent.

Embodiment:

For clearly demonstrating the technical characterstic of this programme,, and, this programme is set forth in conjunction with its accompanying drawing below by an embodiment.

A kind of steam turbine, as depicted in figs. 1 and 2, it comprises housing 5 and is positioned at the main shaft 6 and the impeller 7 of housing 5, at least be provided with one group of impeller 7 in the described housing 5, every group of impeller 7 outsides are to there being one group of nozzle holder 1, the side of nozzle holder 1 is provided with some nozzles that tangentially enter 2, at least be provided with a spirality admission path 10 in the described impeller 7, spirality admission path 10 inside is provided with a blade 9 at least, all blades 9 are all arranged along the diametric(al) of housing 5, as shown in Figure 3, blade 9 is provided with some logical steam vents 11, the periphery of blade 9 is fixedlyed connected with the inwall of admission path 10, described main shaft 6 is a hollow shaft, main shaft 6 is provided with the steam ouput corresponding with the admission path 10 8, and the steam inlet 4 of admission path 10 is along the tangential setting of impeller 7, and steam inlet 4 ends of admission path 10 and the cross-section area of steam ouput 8 ends are less than between the two cross-section area.

High pressure gas in the jet chamber 3 sprays in the spirality admission path 10 by nozzle 2, when gas flows in the admission path 10, form certain pressure difference between each blade 9, the gas pressure that each blade 9 is subjected to the making a concerted effort of all pressure promotes impeller 7 and rotates acting all on same stressed circle; When gas flows between each blade 9, can produce some condensed waters, the steam flow that condensed water is blown into later impacts and enters next stage blade 9 and vaporization in this course, is repeated to utilize, and last remaining tail gas is discharged by main shaft 6.

Claims

1. steam turbine, comprise housing and be positioned at the main shaft and the impeller of housing, it is characterized in that: be provided with one group of impeller in the described housing at least, the impeller outer side ring is wound with nozzle holder, at least be provided with a spiral admission passage in the described impeller, admission passage internal fixation is connected with the blade of the logical steam vent of band, and described main shaft is a hollow shaft, and main shaft is provided with the steam ouput corresponding with the admission passage.

2. steam turbine according to claim 1 is characterized in that: described admission channel interior is provided with a blade at least, and the periphery of blade is fixedlyed connected with the inwall of admission passage.

3. steam turbine according to claim 1 is characterized in that: described every group of impeller outside correspondence has one group of nozzle holder, and the side of nozzle holder is provided with some nozzles that tangentially enter.

4. steam turbine according to claim 2 is characterized in that: the steam inlet end of described admission passage and the cross-section area of steam ouput end are less than the cross-section area at its middle part.

5. steam turbine according to claim 4 is characterized in that: described steam inlet is along the tangential setting of impeller.

6. steam turbine according to claim 4 is characterized in that: all blades in the described admission passage are arranged along the diametric(al) of housing.

7. steam turbine according to claim 6 is characterized in that: described blade is provided with some logical steam vents.