CN218844394U

CN218844394U - Turbine rotor double cooling structure

Info

Publication number: CN218844394U
Application number: CN202223003820.5U
Authority: CN
Inventors: 王姗; 平艳; 钟主海; 吴博; 江生科; 尹明艳
Original assignee: DEC Dongfang Turbine Co Ltd
Current assignee: DEC Dongfang Turbine Co Ltd
Priority date: 2022-11-11
Filing date: 2022-11-11
Publication date: 2023-04-11
Anticipated expiration: 2032-11-11

Abstract

The utility model provides a turbine rotor double cooling structure, which comprises a guide vane arranged at the outlet position of an air inlet cavity, wherein the guide vane forms a first double cooling structure to guide high-temperature steam and reduce the temperature of the high-temperature steam; a second recooling structure, the second recooling structure comprising: the steam inlet through hole is formed at the convex part of the rotor of the air inlet cavity; the mixing cavity is communicated with the steam inlet through hole; an axial chamber. The utility model adds the first heavy cooling structure, so that the high temperature steam flows through the guide vanes, and then the pressure is expanded, and the temperature is reduced; through the addition of the second recooling structure, the passing high-temperature steam only bypasses the first stage stationary blade, and the part of steam still passes through the subsequent flow stage, so that the work loss is small, and the economic impact is small; the steam is not required to be introduced from the outside, the structure is simple, and the cost is low; the double cooling structure enables the surface cooling effect of the rotor to be better and the operation to be safer.

Description

Turbine rotor double cooling structure

Technical Field

The utility model relates to a turbine technical field particularly, relates to a dual cooling structure of turbine rotor.

Background

The improvement of steam parameters of the steam turbine, particularly the steam temperature, puts higher requirements on the material performance of rotating high-temperature parts such as a rotor, and the materials generate creep deformation to influence the safe operation of the rotor when the steam turbine operates at high temperature for a long time. In order to improve the service life of the rotor and improve the creep strength of the rotor, the thermal stress of the high-temperature area of the rotor needs to be reduced, and cooling of the high-temperature area is very necessary.

At present, the conventional cooling mainly comprises three modes, namely an external steam cooling technology, a cooling steam extraction technology and a tangential vortex cooling technology. The external steam cooling needs to introduce the steam with lower external temperature, and the structure is relatively complex. The cooling steam extraction technology needs to lead steam to an outer cylinder interlayer, and large work loss exists. The tangential vortex cooling technology is that a plurality of tangential steam inlet holes are formed in a steam inlet guide ring and communicated with the first-stage stationary blade, and the temperature of steam is reduced by utilizing the vortex principle.

The utility model discloses the content need not introduce outside steam, also need not cause high temperature steam to outer jar intermediate layer. This utility model's technique is simple and easy, can dual reduction main steam temperature, and the unit operation is more stable.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least.

Therefore, the utility model provides a turbine rotor dual cooling structure.

The utility model provides a dual cooling structure of turbine rotor, include:

the guide vanes are arranged at the outlet position of the air inlet chamber, and form a first heavy cooling structure so as to guide the high-temperature steam and reduce the temperature of the high-temperature steam;

a second recooling structure, the second recooling structure comprising:

the steam inlet through hole is formed at the convex part of the rotor of the air inlet cavity;

the mixing chamber is communicated with the steam inlet through hole, and part of high-temperature steam enters the mixing chamber through the steam inlet through hole;

and one end of the axial cavity is communicated with the mixing cavity, the other end of the axial cavity is communicated with the diaphragm cavity positioned at the root part of the first-stage stationary blade, and the high-temperature steam enters the axial cavity from the mixing cavity and flows out from the diaphragm cavity so as to reduce the surface temperature of the rotor.

According to the utility model discloses above-mentioned technical scheme's dual cooling structure of turbine rotor can also have following additional technical characterstic:

in the above technical solution, the number of the steam inlet through holes is several, and each steam inlet through hole is arranged in an inclined manner at a certain angle.

In the above technical solution, the axial chamber is parallel to a central axis of the rotor.

In the technical scheme, the partition plate chamber forms an outlet, and when the static pressure of the outlet is smaller than that of the steam inlet through hole, part of high-temperature steam enters the steam inlet through hole.

In the above technical solution, the blending chamber, the axial chamber and the partition chamber form a flow channel for high temperature steam, and the high temperature steam flows in the flow channel to convert heat energy into kinetic energy.

In the above technical solution, the flow channel has a plurality of inflection points where the high temperature steam changes the flow direction.

The utility model provides a dual cooling structure of turbine rotor compares with prior art, has following beneficial effect:

(1) The utility model adds the first heavy cooling structure, namely the guide vane, so that the high-temperature steam flows through the guide vane, and the pressure is expanded, and the temperature is reduced by a part;

(2) The utility model adds the second cooling structure, so that the passing high-temperature steam only bypasses the first stage stationary blade, and the part of steam still passes through the subsequent flow stage, thereby having little work loss and less influence on economy;

(3) The utility model does not need to introduce steam from the outside, and has simple structure and low cost;

(4) The double cooling structure enables the cooling effect of the surface of the rotor to be better and the operation to be safer.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural view of a dual cooling arrangement for a turbine rotor according to the present invention;

FIG. 2 is a distribution diagram of steam admission holes in a dual cooling arrangement for a turbine rotor according to the present invention;

fig. 3 is a schematic view showing the positional relationship among the steam inlet through hole, the mixing chamber and the axial chamber in the dual cooling structure of a turbine rotor according to the present invention.

Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 3 is:

1. a guide vane; 2. a steam inlet through hole; 3. a blending chamber; 4. axial chamber 5, diaphragm chamber.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

A turbine rotor dual cooling structure provided according to some embodiments of the present invention will be described with reference to fig. 1 to 3.

Some embodiments of the present application provide a turbine rotor dual cooling configuration.

As shown in fig. 1 to fig. 3, an embodiment of the present invention provides a dual cooling structure for a turbine rotor, which includes a guide vane 1, a plurality of steam inlet holes 2 uniformly distributed with a certain inclination angle, a mixing chamber 3, an axial chamber 4, and a partition chamber 5.

In this embodiment, the number of the steam inlet through holes is several, and each steam inlet through hole is arranged in an inclined manner at a certain angle. Wherein the diameter of the steam inlet through hole 2 is D, the diameter of the circle center of the steam inlet through hole 2 is D, the number N of the steam inlet through holes arranged in the circumferential direction meets the following condition, and 2.2D is more than pi D/N is less than 4D.

In addition, the included angle theta between the steam through hole 2 and the circumferential direction is required to be the same as the rotation direction of the rotor, and the included angle meets the following condition that theta is more than 30 degrees and less than 60 degrees.

In this embodiment, the axial cavity is parallel to the central axis of the rotor, so as to ensure that the flow direction of the high-temperature steam in the axial cavity is horizontal, and further take away the heat on the surface of the rotor.

In this embodiment, the partition chamber forms an outlet, and when the static pressure at the outlet is smaller than the static pressure at the steam inlet through hole, part of the high-temperature steam enters the steam inlet through hole and further enters the mixing chamber, so that the high-temperature steam flows up to the subsequent chamber, and in the process, the heat energy of the high-temperature steam is gradually converted into kinetic energy, so that part of the heat energy is consumed.

In this embodiment, mixing cavity, axial cavity and baffle cavity constitute the circulation passageway of high temperature steam, high temperature steam is in the circulation passageway flows to convert heat energy into kinetic energy, high temperature steam can constantly take away the heat on rotor surface at the in-process of heat consumption, thereby realizes the function of rotor cooling, and control rotor surface temperature is in certain within range.

In the present embodiment, the flow channel has a plurality of inflection points at which the high temperature steam changes a flow direction. The function of the inflection point is to change the flow direction of the high-temperature steam, so that the high-temperature steam flows according to a set route, finally the effect of temperature reduction and cooling is ensured, and the high-temperature steam is discharged out of the whole device.

Therefore, the principle of the technical scheme is as follows:

first recooling:

high-temperature steam flows through the guide vanes 1 and then expands in pressure, thereby realizing a part of temperature reduction;

and (4) second cooling:

because the pressure behind the stator blade is reduced, the static pressure at the outlet of the clapboard 5 is smaller than the static pressure when the static pressure enters the round hole, and under the action of the static pressure difference, high-temperature and high-pressure steam enters the steam inlet through hole 2 and then enters the mixing chamber 3, the axial chamber 4 and the clapboard chamber 5, so that the heat energy of the high-temperature steam is converted into kinetic energy, the surface temperature of the rotor is reduced, and the cooling of the rotor surface is realized.

In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A dual cooling arrangement for a turbine rotor, comprising:

the guide vanes are arranged at the outlet position of the air inlet chamber, wherein the guide vanes form a first heavy cooling structure so as to guide the high-temperature steam and reduce the temperature of the high-temperature steam;

a second recooling structure, the second recooling structure comprising:

2. The dual cooling structure of a turbine rotor as claimed in claim 1, wherein the number of the steam inlet through holes is several, and each of the steam inlet through holes is arranged in an inclined manner at a certain angle.

3. The dual cooling arrangement for a turbine rotor as in claim 2 wherein said axial chamber is parallel to the central axis of the rotor.

4. The dual cooling structure for a turbine rotor as claimed in claim 3, wherein the diaphragm chamber forms an outlet, and a part of the high temperature steam enters the steam inlet through hole when a static pressure of the outlet is smaller than a static pressure of the steam inlet through hole.

5. The dual cooling structure for a turbine rotor as claimed in claim 4, wherein the blending chamber, the axial chamber and the diaphragm chamber constitute a flow passage for high temperature steam flowing in the flow passage to convert thermal energy into kinetic energy.

6. The dual cooling structure for a turbine rotor according to claim 5, wherein the flow channel has a plurality of inflection points where the high temperature steam changes flow direction.