Rear casing structure of high-pressure compressor of gas turbine

Abstract

The invention discloses a rear casing structure of a high-pressure compressor of a gas turbine. At present, an air exhaust pipeline of a rear casing is of a straight-through structure and can interfere with a combustion chamber, a lubricating oil inlet pipe and a pipe base are of an integrated welding structure, and the situation that cracking occurs due to the fact that stress between the lubricating oil inlet pipe and unit parts is too large is avoided. The rear casing structure comprises a casing body, a rear casing oil inlet pipe, a rear casing oil discharge pipe, a rear casing air inlet pipe and a rear casing exhaust pipe, an included angle of 54.25 degrees is formed between the rear casing oil inlet pipe and the Y positive axis; the included angle between the rear casing oil inlet pipe and the rear casing exhaust pipe is equal to the included angle between the rear casing oil outlet pipe and the rear casing exhaust pipe. The rear casing oil inlet pipe comprises a lubricating oil inlet pipe, a pipe seat, a protective pipe and an inner lubricating oil pipe, the lubricating oil inlet pipe is in threaded connection with the pipe seat, and the inner lubricating oil pipe and the pipe seat are of an integrated structure. The invention is applied to the rear casing of the high-pressure compressor of the gas turbine.

Description

Technical Field

[0001] The invention relates to a rear casing structure of a high-pressure compressor of a gas turbine. Background Art

[0002] The core components of a gas turbine are composed of a compressor, a combustion chamber, and a turbine. The compressor provides compressed high-pressure gas, which is mixed with fuel in the combustion chamber and burned. The generated high-temperature and high-pressure gas flows through the turbine flow channel coaxial with the compressor, and drives the turbine rotor to rotate through the blades. The gas turbine converts the chemical energy of the fuel into internal energy, and the resulting combustion gas expands and converts into mechanical energy in the turbine. We need to extract air from the compressor part for other structures of the unit to seal, pressurize, and cool; at the same time, we also send lubricating oil into the interior to lubricate and cool the bearings, and send gas into the interior to seal and pressurize the rear casing.

[0003] At present, the exhaust duct of the rear casing is a straight-through structure, which will interfere with the combustion chamber and is misaligned with the fuel injector. A complex structure is needed to connect the gas. The oil inlet pipe and the pipe seat are an integrated welded structure. Considering that under the hot working condition of the unit, the temperature and pressure of the casing and the oil inlet pipe are inconsistent, and the deformation is different, the stress between the oil inlet pipe and the exhaust duct and the unit parts is too large, resulting in cracks. Summary of the invention

[0004] The object of the present invention is to solve the above-mentioned problems, thereby providing a gas turbine high-pressure compressor rear casing structure.

[0005] The above purpose is achieved through the following technical solutions: A gas turbine high-pressure compressor rear casing structure, comprising: a casing body, a rear casing oil inlet pipe, a rear casing oil drain pipe, a rear casing air inlet pipe and a rear casing air extraction pipe; The rear casing oil inlet pipe forms an angle of 54.25° with the Y positive axis; The angles between the rear casing oil inlet pipe and the rear casing air extraction pipe are equal to the angles between the rear casing oil discharge pipe and the rear casing air extraction pipe; The rear casing oil inlet pipe comprises a lubricating oil inlet pipe, a pipe seat, a protective pipe and a lubricating oil inner pipe, the lubricating oil inlet pipe is threadedly connected to the pipe seat, and the lubricating oil inner pipe and the pipe seat are an integrated structure; The rear casing exhaust pipe comprises an exhaust pipe, an exhaust cover and an exhaust casing, and the exhaust cover and the exhaust casing are respectively welded to the outer wall of the rear casing; The air outlet pipe is threadedly connected to the air outlet cover.

[0006] In the gas turbine high-pressure compressor rear casing structure, the lubricating oil inner oil pipe is 8-12 degrees with the negative X axis.

[0007] The gas turbine high-pressure compressor rear casing structure has a protective tube fixed in the casing body, the protective tube protects the lubricating oil inner oil pipe, and the protective tube is elliptical.

[0008] In the gas turbine high-pressure compressor rear casing structure, an annular groove is provided at the end of the lubricating oil inlet pipe, and a gasket is fixed in the annular groove. Beneficial Effects

[0009] 1. The present invention takes into account the inconsistent temperatures and pressures of the casing and the oil inlet pipe and the different deformations under the hot working condition of the unit. The oil inlet pipe and the pipe seat are threadedly connected, and a gasket is provided. The gasket is located in the annular groove of the oil inlet pipe to reserve sufficient deformation to ensure that the stress between the parts of the unit is too large and cracks will not occur.

[0010] 2. The air extraction duct of the present invention is in the form of an air outlet pipe, an air outlet cover and an air outlet cover shell connected to change the direction of the air extraction, and is set to be turned from vertical to horizontal and extracted at an angle. More space can be reserved for the installation of the combustion chamber flame tube, so that the working capacity of the combustion chamber is improved, and at the same time, interference with the combustion chamber is prevented. The turning of the air extraction channel can buffer the air extraction, and at the same time, after being ejected through the air outlet pipe, it is directly tilted to face the fuel injector and can be directly mixed with the intake air of the fuel injector.

[0011] 3. The protection tube of the present invention is elliptical, which reduces the impact of the high-speed airflow in the flow channel on the protection tube and also reduces the influence of the protection tube on the flow field. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional view of the oil inlet of the rear casing; Figure 3 This is an enlarged view of the tail of the lubricating oil inlet pipe; Figure 4 This is a cross-sectional view of the exhaust pipe of the rear receiver; In the figure: 1, rear casing oil inlet pipe; 2, 3, 5, 7, rear casing exhaust pipe; 4, rear casing air inlet pipe; 6, rear casing oil drain pipe; 8, fuel injector; 9, pipe seat; 10, protective pipe; 11, gasket; 12, lubricating oil inlet pipe; A, exhaust cavity; 13, exhaust pipe; 14, exhaust cover; 15, exhaust cover shell; 16, lubricating oil inner oil pipe; 17, ring groove. DETAILED DESCRIPTION

[0013] Reference Figure 1-Figure 4, a gas turbine high-pressure compressor rear casing structure, which comprises: a casing body, a rear casing oil inlet pipe 1, a rear casing oil drain pipe 6, a rear casing air inlet pipe 4 and a rear casing air extraction pipe 2; The rear casing oil inlet pipe forms an angle of 54.25° with the Y positive axis, which expands the installation space for the combustion chamber of the gas engine, ensures the output power of the unit and reduces the size of the gas engine.

[0014] The angles between the rear casing oil inlet pipe and the rear casing air extraction pipe are equal to the angles between the rear casing oil discharge pipe and the rear casing air extraction pipe; The rear casing oil inlet pipe includes a lubricating oil inlet pipe 12, a pipe seat 9, a protective pipe 10 and a lubricating oil inner pipe 16. The lubricating oil inlet pipe is threadedly connected to the pipe seat. The lubricating oil inner pipe and the pipe seat are an integrated structure. An annular groove 17 is provided at the end of the lubricating oil inlet pipe. A gasket 11 is fixed in the annular groove. The gasket can rotate freely around the axis of the lubricating oil inlet pipe, but cannot move axially. A deformation margin can be reserved to improve the deformation of the lubricating oil inlet pipe and the collision with the casing in the case of thermal expansion, while ensuring that the stress between the lubricating oil inlet pipe and the parts of the unit will not be excessive and cracked.

[0015] The rear casing exhaust pipe comprises an exhaust pipe 13, an exhaust cover 14 and an exhaust casing 15, and the exhaust cover and the exhaust casing are respectively welded to the outer wall of the rear casing; The outlet pipe is threadedly connected to the outlet cover, and the exhaust pipe is in the form of connecting the outlet pipe, the outlet cover and the outlet housing. The exhaust is changed in direction, and is set to be turned vertically to horizontally and extracted at an angle, which can reserve more space for the installation of the combustion chamber flame tube, so that the working capacity of the combustion chamber is improved, and at the same time, it prevents interference with the combustion chamber. Because the position is reserved for the installation of the combustion chamber nozzle and the mixer, the flow channel outlet is facing the mixer, and the airflow flows directly from the flow channel outlet to the mixer vertically, so that the premixed combustion in the combustion chamber is more complete and more efficient; The inner oil pipe of the lubricating oil forms an angle of 8-12° with the negative axis X. Since the casing is strong, the inner oil pipe of the lubricating oil forms an angle of 8-12° with the negative axis X to facilitate opening holes in the casing. At the same time, this angle setting reduces the pressure loss of the lubricating oil.

[0016] A protective tube 10 is fixed in the casing body, and the protective tube protects the inner oil pipe of the lubricating oil. The protective tube is elliptical, which reduces the impact of the high-speed airflow in the flow channel on the protective tube.

Claims

1. A gas turbine high pressure compressor rear casing structure, characterized in that: Its components include: a casing body, a rear casing oil inlet pipe, a rear casing oil outlet pipe, a rear casing air inlet pipe and a rear casing air extraction pipe; The rear casing oil inlet pipe forms an angle of 54.25° with the Y positive axis; The angles between the rear casing oil inlet pipe and the rear casing air extraction pipe are equal to the angles between the rear casing oil discharge pipe and the rear casing air extraction pipe; The rear casing oil inlet pipe comprises a lubricating oil inlet pipe, a pipe seat, a protective pipe and a lubricating oil inner pipe, the lubricating oil inlet pipe is threadedly connected to the pipe seat, and the lubricating oil inner pipe and the pipe seat are an integrated structure; The rear casing exhaust pipe comprises an exhaust pipe, an exhaust cover and an exhaust casing, and the exhaust cover and the exhaust casing are respectively welded to the outer wall of the rear casing; The air outlet pipe is threadedly connected to the air outlet cover.

2. The gas turbine high pressure compressor rear casing structure according to claim 1, characterized in that: The lubricating oil inner oil pipe is 8-12 degrees with the negative X axis.

3. The gas turbine high pressure compressor rear casing structure according to claim 2, characterized in that: A protective tube is fixed in the casing body, and the protective tube protects the inner oil pipe of the lubricating oil, and the protective tube is oval.

4. The gas turbine high pressure compressor rear casing structure according to claim 3, characterized in that: An annular groove is provided at the end of the lubricating oil inlet pipe, and a gasket is fixed in the annular groove.

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