阅读说明：本技术 一种无叶过渡混流透平结构 (Bladeless transition mixed flow turbine structure ) 是由 王姗 钟主海 平艳 孙奇 张晓东 陈阳 陶志坚 陈舫 王娟丽 杨长柱 江生科 于 2020-04-07 设计创作，主要内容包括：本发明涉及透平技术,旨在解决现有技术中的透平结构不能兼顾紧凑性和能量损失的问题,提供一种无叶过渡混流透平结构,其包括径流透平和轴流透平,所述径流透平和所述轴流透平通过无叶加速段连通；所述无叶加速段的顶部为半径R1的第一圆弧段,所述无叶加速段的根部包括相互连接的半径R2的第二圆弧段和半径R3的第三圆弧段,且R3＞R2；且第一圆弧段和第二圆弧段同心；第三圆弧段的圆心、第二圆弧段和第三圆弧段的两段圆弧的交接点以及第一圆弧段的圆心在同一直线上,且第三圆弧段和第二圆弧段的圆弧相切。本发明的有益效果是可有效的替代导叶结构,缩短整圈导叶所占轴向空间,可降低成本,并且使得气流加速。(The invention relates to the turbine technology, aims at solving the problem that the turbine structure in the prior art cannot give consideration to compactness and energy loss, and provides a bladeless transition mixed flow turbine structure which comprises a radial flow turbine and an axial flow turbine, wherein the radial flow turbine is communicated with the axial flow turbine through a bladeless acceleration section; the top of the bladeless acceleration section is a first circular arc section with a radius of R1, the root of the bladeless acceleration section comprises a second circular arc section with a radius of R2 and a third circular arc section with a radius of R3 which are connected with each other, and R3 is more than R2; the first arc section and the second arc section are concentric; the circle center of the third arc segment, the intersection point of the second arc segment and the two arcs of the third arc segment and the circle center of the first arc segment are on the same straight line, and the arcs of the third arc segment and the second arc segment are tangent. The guide vane structure can be effectively replaced, the axial space occupied by the whole circle of guide vanes is shortened, the cost is reduced, and the airflow is accelerated.)

1. A vaneless transition mixed flow turbine structure which characterized in that:

the system comprises a radial flow turbine and an axial flow turbine, wherein the radial flow turbine and the axial flow turbine are communicated through a bladeless acceleration section;

the top of the bladeless acceleration section is a first circular arc section with a radius of R1, the root of the bladeless acceleration section comprises a second circular arc section with a radius of R2 and a third circular arc section with a radius of R3 which are connected with each other, and R3 is more than R2; the first arc section and the second arc section are concentric; the circle center of the third arc segment, the intersection point of the second arc segment and the two arcs of the third arc segment and the circle center of the first arc segment are on the same straight line, and the arcs of the third arc segment and the second arc segment are tangent.

2. The vaneless transition mixed flow turbine structure of claim 1, wherein:

the runoff turbine is vertically arranged, and a steam outlet 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 outlet of the radial-flow turbine along the horizontal direction.

3. The vaneless transition mixed flow turbine structure of claim 2, wherein:

the central angle of the first circular arc section is 90 degrees, the second circular arc section is connected with the radial flow turbine, and the central angle A of the second circular arc section is 45 degrees to 65 degrees.

4. The vaneless transition mixed flow turbine structure of claim 3, wherein:

the second circular arc section is connected to the radial-flow turbine, and the central angle A of the second circular arc section is 60 degrees.

5. The vaneless transition mixed flow turbine structure of claim 2, wherein:

the width L1 of the radial flow turbine is less than the width L2 of the axial flow turbine.

6. The vaneless transition mixed flow turbine structure of claim 1, wherein:

the radial-flow turbine comprises a steam inlet volute, a radial-flow stage guide vane and a radial-flow stage movable vane which are connected in sequence;

the axial flow turbine comprises axial flow stage movable blades;

the bladeless accelerating section is connected between the radial flow stage moving blade and the axial flow stage moving blade.

Technical Field

The invention relates to the turbine technology, in particular to a bladeless transition mixed flow turbine structure.

Background

The radial flow turbine has the advantages of compact structure, high single-stage expansion ratio and the like, and is suitable for the fields with small flow and high expansion ratio, such as ORC turbines, medium and small-sized gas turbine turbines and the like. When the expansion ratio is too large, the single-stage radial-flow turbine cannot meet the requirement, and the multi-stage radial-flow turbine needs to be considered. Due to the characteristics of radial steam inlet and axial gas outlet of the radial flow turbine, the structure of the multistage radial flow turbine needs to be increased, the axial size of the turbine is obviously increased, and the characteristic of compact structure of the radial flow turbine is lost.

The axial flow turbine is suitable for occasions with high power and large expansion ratio, and the radial flow turbine and the axial flow turbine are of a mixed structure, so that a part of axial size can be effectively saved.

The conventional radial-flow turbine is provided with transversely arranged guide vanes, an impeller is a rotary structure blade in the radial and axial rotating direction, and the deflection of the airflow angle at the outlet of the impeller is large under partial load, so that the loss of the attack angle of the connected axial-flow secondary inlet is increased, and the pneumatic performance is poor.

Disclosure of Invention

The invention aims to provide a vaneless transition mixed flow turbine structure, and aims to solve the problem that the turbine structure in the prior art cannot give consideration to compactness and energy loss.

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

a bladeless transition mixed flow turbine structure comprises a radial flow turbine and an axial flow turbine, wherein the radial flow turbine and the axial flow turbine are communicated through a bladeless acceleration section;

the top of the bladeless acceleration section is a first circular arc section with a radius of R1, the root of the bladeless acceleration section comprises a second circular arc section with a radius of R2 and a third circular arc section with a radius of R3 which are connected with each other, and R3 is more than R2; the first arc section and the second arc section are concentric; the circle center of the third arc segment, the intersection point of the second arc segment and the two arcs of the third arc segment and the circle center of the first arc segment are on the same straight line, and the arcs of the third arc segment and the second arc segment are tangent.

The bladeless transition mixed flow turbine structure in the scheme is provided with the bladeless acceleration section consisting of the first arc section at the top, the second arc section with two radiuses at the root and the third arc section, so that the guide vane structure can be effectively replaced, on one hand, the axial space occupied by the whole circle of guide vanes can be shortened, and on the other hand, the cost can be reduced; the airflow is accelerated, the airflow guiding function is realized, the design is simple, and the efficiency is high; in addition, the bladeless acceleration section can reduce the energy loss of a whole circle of guide vanes, and the pneumatic efficiency is better.

In one embodiment:

the runoff turbine is vertically arranged, and a steam outlet 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 outlet of the radial-flow turbine along the horizontal direction.

In one embodiment:

the central angle of the first circular arc section is 90 degrees, the second circular arc section is connected with the radial flow turbine, and the central angle A of the second circular arc section is 45 degrees to 65 degrees.

In one embodiment:

the width L1 of the radial flow turbine is less than the width L2 of the axial flow turbine.

In one embodiment:

the radial-flow turbine comprises a steam inlet volute, a radial-flow stage guide vane and a radial-flow stage movable vane which are connected in sequence; the axial flow turbine comprises axial flow stage movable blades;

the bladeless accelerating section is connected between the radial flow stage moving blade and the axial flow stage moving blade.

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 view of a vaneless transition mixed flow turbine structure in an embodiment of the present invention.

Icon: the turbine comprises a bladeless acceleration section 10, a top 10a, a first arc section 11, a root 10b, a second arc section 12, a third arc section 13, a radial flow turbine 20, a steam inlet volute 21, radial flow stage guide vanes 22, radial flow stage movable vanes 23, an axial flow turbine 30 and axial flow stage movable vanes 31.

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.