阅读说明：本技术 一种叶片式变向混流透平结构 (Vane type turning mixed flow turbine structure ) 是由 钟主海 王姗 杜小琴 杨长柱 江生科 平艳 陈阳 孙奇 于 2020-04-07 设计创作，主要内容包括：本发明涉及透平结构领域,旨在解决现有的经流透平和轴流透平的过渡结构下,气动性能较差,机组效率和能源利用率较低的问题,提供一种叶片式变向混流透平结构,其包括轴流透平和径流透平,轴流透平通过过渡结构连接径流透平；过渡结构的根部包括半第一圆弧段和第一直线段；过渡结构的顶部包括第二圆弧段和第二直线段；第二圆弧段和第一圆弧段同心于圆心点O1,且过圆心O1和点D的直线和第一直线段AB相交于点C,满足(X<Sub>C</Sub>-X<Sub>A</Sub>)/(X<Sub>F</Sub>-X<Sub>A</Sub>)＝ζ×(R<Sub>E</Sub>/R<Sub>F</Sub>),其中ζ在0-0.5范围内。本发明的有益效果是能够在不增加额外机组轴向尺寸的基础上实现轴向出气的透平与径向出气排气缸的高效匹配,提高机组效率,提升能源的利用率。(The invention relates to the field of turbine structures, and aims to solve the problems of poor pneumatic performance and low unit efficiency and energy utilization rate of the conventional transitional structure of a radial flow turbine and an axial flow turbine; the root part of the transition structure comprises a semi-first arc section and a first straight line section; the top of the transition structure comprises a second circular arc section and a second straight line section; the second circular arc segment and the first circular arc segment are concentric with the center point O1, and the straight line passing through the center point O1 and the point D intersects the first straight line segment AB at the point C, so that the requirement (X) is met C ‑X A )/(X F ‑X A )＝ζ×(R E /R F ) Wherein ζ is in the range of 0-0.5. The invention has the advantages that the high-efficiency matching of the turbine for axially discharging air and the exhaust cylinder for radially discharging air can be realized on the basis of not increasing the axial size of an additional unit, the unit efficiency is improved, and the energy utilization rate is improved.)

1. The utility model provides a vane type diversion mixed flow turbine structure which characterized in that:

the system comprises a plurality of axial flow turbines and a single radial flow turbine which are sequentially connected, wherein the last axial flow turbine is connected with the radial flow turbine through a transition structure;

the root of the transition structure comprises a radius R_FA first circular arc section FB and a first straight line section BA; the upper end of the first arc section is connected with the root of the radial flow turbine, and the lower end of the first straight line section is connected with the root of the axial flow turbine; the upper end of the first straight line section and the lower end of the first circular arc section are connected to a point B, and the first straight line section and the first circular arc section are tangent to the connection between the first straight line section and the first circular arc sectionA contact B;

the top of the transition structure comprises a radius R_EA second arc section ED and a second straight section DG; the upper end of the second arc section is connected with the top of the radial flow turbine, and the lower end of the second straight section is connected with the top of the axial flow turbine; the upper end of the second straight line section is connected with the lower end of the second circular arc section; the upper end of the second straight line section and the lower end of the second circular arc section are connected to a point D;

the second circular arc segment and the first circular arc segment are concentric to a center point O1, and a straight line passing through the center point O1 and a point D intersects with the first straight line segment AB at a point C, so that the condition (X) is met_C-X_A)/(X_F-X_A)＝ζ×(R_E/R_F) Wherein ζ is in the range of 0-0.5, (X)_C-X_A) Is the difference between the coordinates of point C and point A along the axial direction, (X)_F-X_A) The coordinate difference of the point F and the point A along the axial direction is shown;

the vane type turning structure is limited in a space surrounded by the first arc section FB, the straight line BC, the straight line CD, the second arc section DE and the straight line EF.

2. The vane-type turning mixed-flow turbine structure as claimed in claim 1, wherein:

the axial flow turbines are of equal root diameter or variable root diameter.

3. The vane-type turning mixed-flow turbine structure as claimed in claim 1, wherein:

the same rotor is used for a plurality of axial flow turbines and blade type turning structures.

4. The vane-type turning mixed-flow turbine structure as claimed in claim 1, wherein:

the runoff turbine is vertically arranged, and a steam inlet of the runoff turbine is vertically downward; the axial-flow turbine is horizontally arranged below the radial-flow turbine, and the steam inlet of the axial-flow turbine is vertically spaced from the steam inlet of the radial-flow turbine along the horizontal direction.

5. The vane-type turning mixed-flow turbine structure as claimed in claim 1, wherein:

the axial flow turbine includes a plurality of vanes and/or a plurality of blades.

6. The vane-type turning mixed-flow turbine structure as claimed in claim 1, wherein:

the value of zeta is 0.10-0.30.

7. The vane-type turning mixed-flow turbine structure as claimed in claim 6, wherein:

the value of ζ is 0.16.

8. The vane-type turning mixed-flow turbine structure as claimed in claim 1, wherein:

the airflow enters from the axial flow turbine and is flattened out from the radial flow turbine.

Technical Field

The invention relates to the field of turbine structures, in particular to a vane type turning mixed flow turbine structure.

Background

The conventional axial flow turbine exhausts air axially, and an exhaust cylinder connected behind the conventional axial flow turbine exhausts air axially or radially. The pneumatic loss of the axial air outlet of the exhaust cylinder is relatively low, but reasonable diffusion structural design needs to be carried out by utilizing the axial space, so that the axial size of the unit is overlarge, and inconvenience is brought to the installation and the maintenance of the unit. The radial air outlet of the exhaust cylinder fully utilizes the area expansion in the radial direction, the diffusion capacity of the exhaust cylinder is effectively improved, and the excess speed loss is reduced, but the efficient matching of the axial air outlet of the turbine and the radial air outlet exhaust cylinder is the key for ensuring the better diffusion capacity of the radial air outlet exhaust cylinder.

The radial flow turbine adopts a flow passage structure to realize the change of air flow between the axial direction and the radial direction, and has the characteristics of compact structure, simple manufacturing process, convenient installation and the like. If the radial air outlet exhaust cylinder adopts a radial flow type turbine turning structure to match the axial air outlet of the turbine with the connecting section of the radial air outlet exhaust cylinder, the axial size of the unit can be obviously reduced.

However, the conventional transition structure of the radial turbine and the axial turbine has poor aerodynamic performance, and low unit efficiency and energy utilization rate.

Disclosure of Invention

The invention aims to provide a vane type turning mixed flow turbine structure to solve the problems of poor pneumatic performance, low unit efficiency and low energy utilization rate under the transition structure of the existing turbine and axial flow turbine.

The embodiment of the invention is realized by the following steps:

a vane type turning mixed flow turbine structure comprises a plurality of axial flow turbines and a single radial flow turbine which are sequentially connected, wherein the last axial flow turbine is connected with the radial flow turbine through a transition structure;

the root of the transition structure comprises a radius R_FA first circular arc section FB and a first straight line section BA; the upper end of the first arc section is connected with the root of the radial flow turbine, and the lower end of the first straight line section is connected with the root of the axial flow turbine; the upper end of the first straight line section and the lower end of the first circular arc section are connected to a point B, and the first straight line section and the first circular arc section are tangent to the connection point B of the first straight line section and the first circular arc section;

the top of the transition structure comprises a radius R_EA second arc section ED and a second straight section DG; the upper end of the second arc section is connected with the top of the radial flow turbine, and the lower end of the second straight section is connected with the top of the axial flow turbine; the upper end of the second straight line section is connected with the lower end of the second circular arc section; the upper end of the second straight line section and the lower end of the second circular arc section are connected to a point D;

the second circular arc segment and the first circular arc segment are concentric to a center point O1, and a straight line passing through the center point O1 and a point D intersects with the first straight line segment AB at a point C, so that the condition (X) is met_C-X_A)/(X_F-X_A)＝ζ×(R_E/R_F) Wherein ζ is in the range of 0-0.5, (X)_C-X_A) Is the difference between the coordinates of point C and point A along the axial direction, (X)_F-X_A) The coordinate difference of the point F and the point A along the axial direction is shown;

the vane type turning structure is limited in a space surrounded by the first arc section FB, the straight line BC, the straight line CD, the second arc section DE and the straight line EF.

Vane type diversion mixed flow turbine structure in this scheme is through the structure setting to transition structure's top and bottom to suitably inject vane type diversion structure's scope, it can realize the turbine of axially giving vent to anger and the high-efficient matching of the exhaust cylinder of radially giving vent to anger on the basis that does not increase extra unit axial dimension, improves unit efficiency, promotes the utilization ratio of the energy.

In one embodiment:

the axial flow turbines are of equal root diameter or variable root diameter.

In one embodiment:

the same rotor is used for a plurality of axial flow turbines and blade type turning structures.

In one embodiment:

the runoff turbine is vertically arranged, and a steam inlet of the runoff turbine is vertically downward; the axial-flow turbine is horizontally arranged below the radial-flow turbine, and the steam inlet of the axial-flow turbine is vertically spaced from the steam inlet of the radial-flow turbine along the horizontal direction.

In one embodiment:

the axial flow turbine includes a plurality of vanes and/or a plurality of blades.

In one embodiment:

the value of zeta is 0.10-0.30.

In one embodiment:

the value of ζ is 0.16.

In one embodiment:

the airflow enters from the axial flow turbine and is flattened out from the radial flow turbine.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 shows a schematic structural diagram of a vane-type turning mixed-flow turbine structure according to an embodiment of the present invention.

Icon: the axial-flow turbine 20, the radial-flow turbine 30, the transition structure 10, the stationary blade 21, the movable blade 22, the transition structure 10, the root 10a, the top 10b and the blade type turning structure 40.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.