Single-side sealing turbine cooling guide vane assembly for small-power gas turbine

Abstract

The invention aims to provide a single-side sealed turbine cooling guide vane assembly for a low-power gas turbine, which belongs to the field of gas turbines and comprises a guide vane, a cover plate and a flow guide core, the flow guide core is positioned above the front edge of the guide vane, the cover plate is mounted on the flow guide core, a throttling hole is formed in the cover plate, and a small hole is formed in the flow guide core; the interior of the guide blade comprises a front edge cavity, a staggered rib matrix and a tail edge structure, transverse streaming ribs are distributed on the front edge cavity, and the tail edge structure is provided with a rectangular exhaust window. The single-side sealing structure has the advantages of being simple in sealing structure and reliable in sealing effect. The cooling blade has specific cooling structure parameters, the cooling effect and the working reliability of the turbine cooling guide vane assembly are improved, and the reliable cooling guide vane assembly is provided for a newly-researched small gas turbine.

Description

Technical Field

[0001] The present invention relates to a gas turbine, in particular to a turbine blade. Background Art

[0002] Gas turbines are high-end equipment widely used in the power equipment and energy fields. Their design and manufacturing difficulty is at the top level of the manufacturing industry. Turbine blades are key components of gas turbines. Their harsh working environment such as high temperature and high pressure makes them difficult to design and manufacture, and their failure rate is high, which has a crucial impact on the reliability of gas turbines.

[0003] Small gas turbines are characterized by compact structure and high flexibility. For new gas turbines, their blade design often relies on mature unit structures. However, since gas turbines are high-end equipment, blades are key components of gas turbines. The design parameters of gas turbine blades are often confidential internationally. The blade design of new gas turbines needs to be achieved through self-research. Summary of the invention

[0004] The object of the present invention is to provide a single-side sealed turbine cooling guide vane assembly for a low-power gas turbine which has a compact structure, is easy to install, has a good sealing effect and works reliably.

[0005] The object of the present invention is achieved in that:

[0006] The present invention discloses a single-side sealed turbine cooling guide vane assembly for a low-power gas turbine, which is characterized in that it comprises a guide vane, a cover plate, and a guide core, wherein the guide core is located above the leading edge of the guide vane, the cover plate is mounted on the guide core, a throttling hole is arranged on the cover plate, and a small hole is arranged in the guide core; the interior of the guide vane comprises a leading edge cavity, a staggered rib matrix, and a trailing edge structure, transverse flow ribs are distributed on the leading edge cavity, and a rectangular exhaust window is arranged in the trailing edge structure.

[0007] The present invention may also include:

[0008] 1. The staggered rib matrix includes a front staggered rib matrix and a rear staggered rib matrix. The front staggered rib matrix includes front staggered ribs, the spacing between the front staggered ribs is 2.1 mm, and the angle with the horizontal plane is 45°. The rear staggered rib matrix includes rear staggered ribs, the spacing between the rear staggered ribs is 1.6 mm, and the angle with the horizontal plane is 30°.

[0009] 2. The angle between the transverse flow rib and the horizontal line is 0°, and the number of rectangular exhaust windows is 11.

[0010] 3. The wall thickness of the guide blade gradually decreases from the leading edge to the trailing edge of the blade, and the rectangular exhaust window has a width of 0.5 to 0.6 mm.

[0011] 4. The outer structure of the guide blade includes an outer edge plate, an inner edge plate and a blade body, and the outer edge plate and the inner edge plate are provided with a sealing groove structure.

[0012] 5. The outer edge plate and the inner edge plate have an angle of 45° with the engine axis respectively.

[0013] 6. The outer edge plate and the inner edge plate each have a single-sided sealing groove, the width of the sealing groove is 2.5 mm and the depth is 3.5 mm.

[0014] The advantages of the present invention are: the single-side sealing structure of the present invention has the characteristics of simple sealing structure and reliable sealing effect. The cooling blade has unique cooling structure parameters, which improves the cooling effect and working reliability of the turbine cooling guide vane assembly, and provides a reliable cooling guide vane assembly for the newly developed small gas turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention;

[0016] Figure 2 It is a schematic diagram of the edge plate and the sealing groove structure;

[0017] Figure 3 Schematic diagram of the cooling structure of the guide blades;

[0018] Figure 4 Schematic diagram of the cross-sectional structure of the guide vane assembly;

[0019] Figure 5 A perspective view of the guide vane assembly. DETAILED DESCRIPTION

[0020] The present invention is described in more detail below with reference to the accompanying drawings:

[0021] Combination Figure 1-5 The present invention is as follows Figure 1 As shown, it is composed of three main parts: guide vanes, guide cores and cover plates. The guide vanes are the main body of the guide vane assembly, the guide core and the cover plate are the enclosure structure, the front of the guide core has several small holes for cooling air to pass through, and the cover plate has a throttle hole for adjusting the cooling air flow through the guide vanes. The cooling scheme of the guide vane assembly of the present invention is implemented as follows: first, the cooling air enters the guide core from the holes on the cover plate, then enters the leading edge of the guide vane from the holes on the leading edge of the guide core, after heat exchange with the ribs on the leading edge of the guide vane, enters the front staggered ribs for heat exchange, and then enters the rear staggered ribs for heat exchange, and the cooling air that has been fully heat exchanged is discharged through 11 windows on the trailing edge.

[0022] like Figure 2The figure shows the edge plate structure and sealing groove structure of the guide vane assembly of the embodiment of the present invention. The angles between the outer edge plate and the inner edge plate and the engine axis are both 45°, which has good tolerance for the guide vane blade. The outer edge plate and the inner edge plate respectively have a single-sided sealing groove structure, the height of the sealing groove is 2.5mm, and the depth is 3.5mm. The sealing groove of the guide vane assembly is assembled on the guide device in a full circle with the sealing sheet, which has good sealing performance.

[0023] like Figure 3 The internal cooling structure of the guide vane of the embodiment of the present invention is shown, which is divided into a leading edge cavity, a front staggered rib matrix, a rear staggered rib matrix and a trailing edge structure. Several transverse flow ribs are distributed on the leading edge cavity, and the angle between the flow ribs and the horizontal line is 0°. The staggered rib matrix consists of two parts, the front and the rear. The spacing between the front staggered ribs is 2.1mm, and the angle with the horizontal plane is 45°. The spacing between the rear staggered ribs is 1.6mm, and the angle with the horizontal plane is 30°. The staggered ribs have the characteristics of more complete heat exchange. The distance and angle of the staggered ribs are achieved through heat transfer optimization design, and have a good cooling effect. The trailing edge structure is composed of 11 rectangular exhaust windows.

[0024] like Figure 4 The figure shows a schematic cross-sectional view of the blade body of the guide vane assembly according to an embodiment of the present invention. The wall thickness of the guide vane gradually decreases from the leading edge to the trailing edge of the blade, and the exhaust window 11 at the trailing edge has a width of 0.5 to 0.6 mm.

[0025] like Figure 5 The perspective view of the guide vane assembly shown more intuitively illustrates the structure of the single-side sealed turbine cooling guide vane assembly of the present invention.

Claims

1. A single-side sealed turbine cooling guide vane assembly for a low-power gas turbine, characterized in that: It includes a guide blade, a cover plate, and a guide core. The guide core is located above the leading edge of the guide blade. The cover plate is installed on the guide core. A throttling hole is arranged on the cover plate, and a small hole is arranged in the guide core. The interior of the guide vane includes a leading edge cavity, a staggered rib matrix, and a trailing edge structure. Transverse flow ribs are distributed on the leading edge cavity, and a rectangular exhaust window is arranged on the trailing edge structure.

2. A single-side sealed turbine cooling guide vane assembly for a low-power gas turbine according to claim 1, characterized in that: The staggered rib matrix includes a front staggered rib matrix and a rear staggered rib matrix. The front staggered rib matrix includes front staggered ribs, the spacing between the front staggered ribs is 2.1 mm, and the angle with the horizontal plane is 45°. The rear staggered rib matrix includes rear staggered ribs, the spacing between the rear staggered ribs is 1.6 mm, and the angle with the horizontal plane is 30°.

3. The single-side sealed turbine cooling guide vane assembly for a low-power gas turbine according to claim 1, characterized in that: The angle between the transverse flow rib and the horizontal line is 0°, and the number of rectangular exhaust windows is 11.

4. The single-side sealed turbine cooling guide vane assembly for a low-power gas turbine according to claim 1, characterized in that: The wall thickness of the guide blade gradually decreases from the leading edge to the trailing edge of the blade, and the rectangular exhaust window has a width of 0.5 to 0.6 mm.

5. The single-side sealed turbine cooling guide vane assembly for a low-power gas turbine according to claim 1, characterized in that: The outer structure of the guide blade includes an outer edge plate, an inner edge plate and a blade body, and the outer edge plate and the inner edge plate are provided with a sealing groove structure.

6. A single-side sealed turbine cooling guide vane assembly for a low-power gas turbine according to claim 5, characterized in that: The outer edge plate and the inner edge plate respectively have an angle of 45° with the engine axis.

7. The single-side sealed turbine cooling guide vane assembly for a low-power gas turbine according to claim 5, characterized in that: The outer edge plate and the inner edge plate respectively have a single-sided sealing groove, and the width of the sealing groove is 2.5 mm and the depth is 3.5 mm.

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