1. A turbine movable vane with a gas supply hole extending to the root and a gas film hole of a flange plate comprises a vane body (2), a lower flange plate (3) and a vane root (5); the blade body (2) is arranged on the lower edge plate (3); an air inlet channel is formed in the blade root (5), and an inlet of the air inlet channel is formed in the bottom of the blade root (5); the method is characterized in that: also comprises a root extension (4); the extending root (4) is arranged between the lower edge plate (3) and the blade root (5), a cold air channel (10) is arranged inside the extending root (4), and an air supply hole (9) is arranged on the surface of the extending root (4); the inlet of the air supply hole (9) is communicated with the cold air channel (10), and the outlet of the air supply hole (9) is obliquely directed to the lower edge plate (3); the lower edge plate (3) is provided with an edge plate air film hole (8); a cooling air flow channel extending from the front edge (6) of the blade body to the tail edge (7) of the blade body is formed in the blade body (2); the cold air channel (10) is communicated with an air inlet channel inside the blade root (5) and a cooling air channel inside the blade body (2).

2. The turbine blade with a stub air supply hole and a platform film hole as in claim 1, wherein: the outlet of the air supply hole (9) is obliquely directed to the high-temperature area of the lower edge plate (3); the edge plate gas film hole (8) is formed in the high-temperature area of the lower edge plate (3); cooling air flows in from an air inlet channel at the bottom of the blade root (5), enters a cold air channel (10) inside the extension root (4), flows out from an air supply hole (9) on the extension root (4), flows out from a gas film hole (8) of the edge plate after impact cooling is carried out on a high-temperature area of the lower edge plate (3), and forms cooling air film covering on the lower edge plate (3).

3. A turbine bucket with a stub air supply hole and a platform film hole as in claim 1 or 2 wherein: the air supply hole (9) is a round hole, and the air supply hole (9) is arranged at the position where the extension root (4) is not deformed and has larger thickness.

4. A turbine bucket with a stub air supply hole and a platform film hole as in claim 1 or 2 wherein: the ratio of the sectional area of the air supply hole (9) to the sum of the sectional areas of the throats of the air film holes (8) of the upper edge plate of the lower edge plate (3) is 1.2-2.

5. The turbine blade with a stub air supply hole and a platform film hole as in claim 3, wherein: the ratio of the sectional area of the air supply hole (9) to the sum of the sectional areas of the throats of the air film holes (8) of the upper edge plate of the lower edge plate (3) is 1.2-2.

6. A turbine bucket with a stub air supply hole and a platform film hole as in claim 1 or 2 wherein: the blade root (5) is a fir tree tenon root and is used for being matched with the fir tree mortise of the wheel disc.

7. The turbine blade with a stub air supply hole and a platform film hole as in claim 3, wherein: the blade root (5) is a fir tree tenon root and is used for being matched with the fir tree mortise of the wheel disc.

8. The turbine blade with a stub air supply hole and a platform film hole as claimed in claim 4, wherein: the blade root (5) is a fir tree tenon root and is used for being matched with the fir tree mortise of the wheel disc.

9. The turbine blade with a stub air supply hole and a platform film hole as claimed in claim 5, wherein: the blade root (5) is a fir tree tenon root and is used for being matched with the fir tree mortise of the wheel disc.

10. The turbine blade with a stub air supply hole and a platform film hole as claimed in claim 9, wherein: the air film hole (8) of the edge plate and the lower edge plate (3) form a certain space angle, and the air film hole (8) of the edge plate adopts a circular air film hole with equal sectional area, a dustpan-shaped air film hole or an expansion-type air film hole.

Background

The modern gas turbine mainly comprises a gas compressor, a combustion chamber and a turbine, wherein the gas compressor compresses sucked air to the combustion chamber, the air and the fuel are mixed and combusted, and generated high-temperature and high-pressure gas enters the turbine to push the turbine to drive the gas compressor and output work outwards through an output shaft.

The outlet temperature (i.e. the inlet temperature of the turbine) of the combustion chamber of the modern gas turbine is continuously increased, the high temperature resistance degree of the current latest high-temperature alloy material is far lower than the gas temperature outside the blade, and cooling air compressed by a compressor is required to be introduced into the blade to cool the blade. The cooling air generally flows in from the blade root, passes through the complex cooling air flow passage in the blade, and is discharged from the pore canal of the blade body, the blade top and the blade tail.

The turbine blades are divided into stationary blades and movable blades. The rotor blade is a rotating rotor blade, and the existing rotor blade cooling technology mainly focuses on cooling the blade body as follows: the cooling technology of the blade edge plate is less due to the adoption of a ribbed serpentine cooling channel, a matrix type cooling structure, a front edge air film hole and the like.

However, as the temperature of the combustion gases rises, the temperature of the blade edge plate without cooling structure exceeds the allowable temperature of the blade material. Particularly, in the industrial and marine gas turbines, the gas flow rate is larger than that of the marine gas turbine, the overall size of the high-pressure turbine moving blade is also larger than that of the marine gas turbine, the edge of the blade edge plate is farther away from the blade body, and the cooling flow channel in the blade cannot cool the edge plate, so that the temperature of the blade edge plate is further increased. If the design of the blade and the internal flow passage of the blade is changed greatly to cool the edge plate, the integral structure of the blade is further complicated, and great difficulty is brought to the casting and processing of the blade. Therefore, it is important to cool the platform without significantly changing the cooling structure of the blade. The problem with this aim is to find a cooling structure for the platform which does not have a major effect on the blade cooling structure.

Disclosure of Invention

The invention aims to provide a turbine rotor blade with a root-extending air supply hole and a flange plate air film hole, which can well cool a flange plate.

The purpose of the invention is realized by the following technical scheme: comprises a blade body 2, a lower edge plate 3 and a blade root 5; the blade body 2 is arranged on the lower edge plate 3; an air inlet channel is formed in the blade root 5, and an inlet of the air inlet channel is formed in the bottom of the blade root 5; also comprises a root extension 4; the extending root 4 is arranged between the lower edge plate 3 and the blade root 5, a cold air channel 10 is arranged inside the extending root 4, and an air supply hole 9 is arranged on the surface of the extending root 4; the inlet of the air supply hole 9 is communicated with the cold air channel 10, and the outlet of the air supply hole 9 is obliquely directed to the lower flange plate 3; the lower edge plate 3 is provided with an edge plate air film hole 8; a cooling air flow channel extending from the blade front edge 6 to the blade tail edge 7 is formed in the blade body 2; the cold air channel 10 is communicated with an air inlet channel inside the blade root 5 and a cooling air channel inside the blade body 2.

The present invention may further comprise:

the outlet of the air supply hole 9 is obliquely directed to the high-temperature area of the lower edge plate 3; the edge plate gas film hole 8 is formed in the high-temperature area of the lower edge plate 3; cooling air flows in through an air inlet channel at the bottom of the blade root 5, enters a cold air channel 10 inside the extension root 4, flows out through an air supply hole 9 in the extension root 4, flows out through a flange air film hole 8 after impact cooling is carried out on a high-temperature area of the lower flange plate 3, and forms cooling air film covering on the lower flange plate 3.

The air supply hole 9 is a round hole, and the air supply hole 9 is arranged at the position where the extension root 4 is not deformed and the thickness is larger.

The proportion of the sectional area of the air supply hole 9 to the sum of the sectional areas of the throats of the air film holes 8 of the upper edge plate of the lower edge plate 3 is 1.2-2.

The blade root 5 is a fir tree tenon root and is used for being matched with a fir tree mortise of the wheel disc.

The edge plate air film hole 8 and the lower edge plate 3 form a certain space angle, and the edge plate air film hole 8 adopts a circular air film hole with equal sectional area, a dustpan-type air film hole or an expansion-type air film hole.

The invention has the beneficial effects that:

the cooling structure combining the root air supply hole and the flange plate air film hole is adopted, the movable blade flange plate of the turbine of the gas turbine can be effectively cooled, the structure does not bring great change to the original cooling structure, and the double requirements of the cooling effect and the manufacturability can be met. The invention does not increase the casting difficulty of the blade, has low processing difficulty and can effectively ensure the yield of the blade. The invention can effectively increase the safety of the blade and prolong the service life.

Drawings

FIG. 1 is a schematic front view of a turbine bucket with a stub air supply hole and a platform film hole.

FIG. 2 is a back side view of a turbine bucket with a stub air supply hole and a platform film hole.

FIG. 3 is a perspective view of a turbine bucket with a stub air supply hole and a platform film hole.

Fig. 4 is a view taken along direction a of fig. 1.

FIG. 5 is a partial perspective view of a high pressure turbine bucket and disk assembly without the present invention.

FIG. 6 is a partial perspective view of a high pressure turbine bucket and disk assembly incorporating the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

The invention provides a gas turbine blade for an industrial or marine gas turbine, which can cool a flange plate well. The invention does not greatly change the original cooling structure, and has the advantages of relatively simple structure, convenient processing and manufacturing and good cooling effect.

A turbine movable vane 1 with a gas supply hole extending to the root and a gas film hole of a flange plate belongs to the field of gas turbines and comprises a vane body 2, a lower flange plate 3 and a vane root 5; the blade body 2 is arranged on the lower edge plate 3; an air inlet channel is formed in the blade root 5, and an inlet of the air inlet channel is formed in the bottom of the blade root 5; also comprises a root extension 4; the extending root 4 is arranged between the lower edge plate 3 and the blade root 5, a cold air channel 10 is arranged inside the extending root 4, and an air supply hole 9 is arranged on the surface of the extending root 4; the inlet of the air supply hole 9 is communicated with the cold air channel 10, and the outlet of the air supply hole 9 is obliquely directed to the lower flange plate 3; the lower edge plate 3 is provided with an edge plate air film hole 8; a cooling air flow channel extending from the blade front edge 6 to the blade tail edge 7 is formed in the blade body 2; the cold air channel 10 is communicated with an air inlet channel inside the blade root 5 and a cooling air channel inside the blade body 2.

The cooling structure combined by the root air supply hole and the flange plate air film hole can effectively cool the turbine moving blade flange plate of the gas turbine, and the structure does not bring great change to the original cooling structure. The cooling structure can meet the dual requirements of cooling effect and manufacturability, the casting difficulty of the blade cannot be increased by adopting the cooling structure, the machining difficulty is low, and the yield of the blade can be effectively guaranteed. The invention can effectively increase the use safety and the service life of the blade, has low processing difficulty and can meet the double requirements of cooling effect and manufacturability.

FIG. 5 illustrates a partial cross-section of a turbine bucket and disk assembly without the present technique. The lower edge plates 3 and the extension roots 4 of the turbine rotor blades and the lower edge plates 3 and the extension roots 4 of the adjacent turbine blades 1 and the wheel disc 13 jointly surround an air cavity 11. As can be seen from the figure, the air chamber 11 is closely enclosed, and during operation of the gas turbine, no air flows in the air chamber 11, i.e. no air flows out of or into the chamber 11. As can be seen from fig. 5, the high-temperature gas up to thousands of degrees flows in the channel formed by the lower edge plate 3 and the blade 2, and will continuously heat the cavity 11, and because no air flows in the cavity 11, the air temperature in the cavity 11 will be finally heated to be close to the high-temperature gas temperature, which will cause the temperature of the lower edge plate 3 to be too high, and will seriously affect the safety of the blade and the service life of the blade.

Fig. 6 shows a partial cross-section of the assembled turbine bucket 1 of the present invention with a disk. As can be seen from the figure, the cooling air indicated by the arrows flows into the cooling air channel 10 from the bottom of the blade, flows out from the air supply holes 9 on the root 4, and flows out from the air film holes 8 of the lower edge plate 3 after impingement cooling. After the invention is adopted, cooling air flows in the cavity 11, the cooling air flowing out from the edge plate air film holes 8 can cover the edge plate 3, the temperature of the lower edge plate 3 is obviously reduced compared with that of a blade which is not adopted, and the safety of the blade in use and the service life of the blade can be greatly improved.

Example 1:

referring to fig. 1 and 2, there is shown a turbine blade 1 with root feed holes and platform film holes comprising a blade 2 extending between a leading edge 6 and a trailing edge 7 mounted on a lower platform 3 supported by a tang 4, the lower platform 3 being connected to the blade 2 by a circular transition radius, the tang 4 connecting the lower platform 3 to a blade root 5, the blade root 5 being a fir tree tang for mating with a fir tree groove of a disk. The blade body 2 has one or more cooling air passages between the leading edge 6 and the trailing edge 7 for circulation of cooling air, the cooling air passages extending from the bottom of the blade to the top of the blade. Fig. 1 shows the air supply openings 9 in the lugs 4 for supplying cooling air to the web air film openings 8 in the lower web 3, which cooling air can flow out of the web air film openings 8 and form a cooling air film cover for the lower web 3.

Fig. 3 shows a cross-sectional view of the turbine blade 1, and cooling air indicated by black arrows flows from the bottom of the blade into the cooling air passage 10, flows out from the air supply holes 9 in the root 4, and flows out from the platform film holes 8 after impingement cooling the surface of the lower platform 3. The air supply hole 9 is arranged at the position where the root extension section 4 is not deformed and has a large thickness, is circular, and has a roughly constant cross section, so that the negative influence on the strength is avoided. The outlets of the air supply holes 9 are obliquely directed to the high-temperature area of the flange plate, and the sprayed cooling air can realize impingement cooling on the high-temperature area.

Example 2:

FIG. 4 illustrates the location of the platform film holes 8 on the lower platform 3. in this example, the platform film holes 8 are located centrally above the lower platform 3, as determined by the film hole machining process and cooling design. Platform film holes 8 may be placed at any suitable location on the lower platform of the bucket as required by the bucket cooling design. The air film hole 8 of the flange plate and the blade flange plate 3 form a certain space angle, the air film hole 8 of the flange plate in the embodiment adopts a circular air film hole with equal sectional area, and the air film hole can also adopt a dustpan type or an expansion type and other shapes.

Example 3:

preferably, the air supply hole in the root extension and the air film hole in the blade flange plate can be machined by a machining method after the blade is cast, and the machining difficulty of the blade is effectively reduced by the structure.

More preferably, the ratio of the cross section area of the circular hole on the root extension 4 to the sum of the cross section areas of the throats of the air film holes on the lower edge plate 3 is 1.2-2.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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.