Pipeline arrangement structure of rear casing of high-pressure compressor of small and medium-sized gas turbine

Abstract

The invention relates to the technical field of gas turbines, in particular to a pipeline arrangement structure of a rear casing of a high-pressure compressor of a small and medium-sized gas turbine, and aims to solve the problem of strength of an exhaust pipe adopting welding or threaded connection in an arrangement scheme of the rear casing of the gas turbine. Eight supporting column grooves are evenly distributed in the outer ring of the rear casing of the high-pressure compressor, a lubricating oil supply pipe, an air supply pipe, a lubricating oil return pipe and an exhaust pipe are fixedly connected with one supporting column groove, the front portion of the rear casing of the high-pressure compressor is fixedly connected with a front flange through a plurality of reinforcing ribs, and a main runner is formed in the space between the rear casing of the high-pressure compressor and the front flange. The lubricating oil supply pipe, the gas supply pipe, the two lubricating oil return pipes and the four exhaust pipes are located in the notches of the front flange respectively, during working, high-temperature and high-pressure gas blows through media flowing through the main flow channel, the lubricating oil supply pipe, the gas supply pipe, the lubricating oil return pipes and the exhaust pipes, and heat exchange is conducted when the media flow through the supporting column grooves and enter the rear casing of the high-pressure compressor. The device is high in feasibility, reasonable in structure and high in safety.

Description

Technical Field

[0001] The invention belongs to the technical field of gas turbines, and in particular relates to a pipeline arrangement structure of a rear casing of a high-pressure compressor of a small or medium-sized gas turbine. Background Art

[0002] The commonly used layout of the gas turbine rear casing is as follows Figure 1-2 As shown, the exhaust pipe uses a wall plate groove structure to lead the gas in the rear casing. The main defect is that the structure is complex, and the wall plate groove is fixed to the high-pressure compressor casing by welding. Once a large number of welding surfaces in the whole circle have defects, the air tightness of the air supply pipe chamber cannot be guaranteed. The vibration and thermal expansion during the operation of the unit will also affect the weld strength and sealing of the air supply pipe. In the pipeline layout of the rear casing, if the lubricating oil supply pipe, lubricating oil return pipe and air supply pipe are often connected by a threaded structure, the strength at the connection is weak, and structural damage may occur under the working conditions of the gas turbine.

[0003] In summary, in the layout of the rear casing of the gas turbine, there are problems with either welding or threading the exhaust pipe. Summary of the invention

[0004] The purpose of the patent of this invention: The invention is to solve the problems existing in the background technology. The invention provides a piping arrangement structure for the rear casing of the high-pressure compressor of a small and medium-sized gas turbine.

[0005] The object of the present invention is achieved as follows: A pipeline arrangement structure of a high-pressure compressor rear casing of a small and medium-sized gas turbine, characterized in that it includes a high-pressure compressor rear casing, a front flange, a lubricating oil supply pipe, an air supply pipe, two lubricating oil return pipes, four exhaust pipes and a plurality of reinforcing ribs;

[0006] Eight support grooves are evenly distributed on the outer ring of the high-pressure compressor rear casing, and the lubricating oil supply pipe, air supply pipe, two lubricating oil return pipes and four exhaust pipes are respectively fixedly connected to a support groove, and the front of the high-pressure compressor rear casing is fixedly connected to the front flange through multiple reinforcing ribs. The space between the high-pressure compressor rear casing and the front flange forms a main flow channel, and the outer ring of the front flange is provided with eight notches, and the lubricating oil supply pipe, air supply pipe, two lubricating oil return pipes and four exhaust pipes are respectively located in a notch. During operation, high-temperature and high-pressure gas blows through the main flow channel, and the medium flowing through the lubricating oil supply pipe, air supply pipe, two lubricating oil return pipes and four exhaust pipes flows through the support grooves and enters the high-pressure compressor rear casing for heat exchange.

[0007] Furthermore, the number of the reinforcing ribs is eight, and the eight reinforcing ribs are evenly distributed along the circumferential direction.

[0008] Furthermore, the acute angle formed by the axis of the lubricating oil supply pipe and the horizontal line is 33°45′.

[0009] Furthermore, two lubricating oil return pipes are located below the rear casing of the high-pressure compressor.

[0010] Furthermore, the included angles of the axis of the lubricating oil supply pipe, the axis of the air supply pipe, the axes of the two lubricating oil return pipes and the axes of the four exhaust pipes with the central axis of the rear casing of the high-pressure compressor are all 10°.

[0011] Further, the lubricating oil supply pipe comprises a lubricating oil supply pipe inner pipe, a lubricating oil supply pipe outer pipe, a lubricating oil supply pipe boss and a lubricating oil supply pipe intubation;

[0012] The inner tube of the lubricating oil supply pipe is located inside the outer tube of the lubricating oil supply pipe, a gap is left between the inner tube of the lubricating oil supply pipe and the outer tube of the lubricating oil supply pipe, the outer wall of the outlet end of the inner tube of the lubricating oil supply pipe is welded to the inner wall of the outer tube of the lubricating oil supply pipe in a full circle, after a section of the outer tube of the lubricating oil supply pipe is inserted into one end of the lubricating oil supply pipe boss, the outer wall of the outer tube of the lubricating oil supply pipe and the joint of one end of the lubricating oil supply pipe boss are welded in a full circle, the lubricating oil supply pipe insert pipe is connected to the other end of the lubricating oil supply pipe boss and is integrally arranged, the lubricating oil supply pipe boss is welded to the rear casing of the high-pressure compressor, the lubricating oil supply pipe insert pipe is inserted into the support groove with a gap between it and the support groove.

[0013] Further, the lubricating oil return pipe comprises a lubricating oil return pipe inner pipe, a lubricating oil return pipe outer pipe, a lubricating oil return pipe boss and a lubricating oil supply pipe insert pipe;

[0014] The inner tube of the lubricating oil return pipe is located inside the outer tube of the lubricating oil return pipe, a gap is left between the inner tube of the lubricating oil return pipe and the outer tube of the lubricating oil return pipe, the end of the outer tube of the lubricating oil return pipe is sleeved on the outer wall of the inner tube of the lubricating oil return pipe, after a section of the inner tube of the lubricating oil return pipe is inserted into one end of the lubricating oil return pipe boss, the outer wall of the inner tube of the lubricating oil return pipe and the joint of one end of the lubricating oil return pipe boss are welded in a whole circle, the lubricating oil supply pipe insert is welded to the other end of the lubricating oil return pipe boss, the lubricating oil return pipe boss is welded to the rear casing of the high-pressure compressor, the lubricating oil supply pipe insert is located in the support groove and a gap is left between it and the support groove.

[0015] Further, the air supply pipe includes an air supply pipe inner pipe, an air supply pipe outer pipe, an air supply pipe boss and an air supply pipe intubation pipe;

[0016] The inner tube of the air supply pipe is located inside the outer tube of the air supply pipe, with a gap left between them. The end of the outer tube of the air supply pipe is sleeved on the outer wall of the inner tube of the air supply pipe. After a section of the inner tube of the air supply pipe is inserted into one end of the air supply pipe boss, the outer wall of the inner tube of the air supply pipe and one end of the air supply pipe boss are welded in a full circle. The air supply pipe insert is welded to the other end of the air supply pipe boss, and the air supply pipe boss is welded to the rear casing of the high-pressure compressor. The air supply pipe insert is located in the support groove and a gap is left between it and the support groove.

[0017] Further, the exhaust pipe includes an exhaust pipe insert and an exhaust pipe boss;

[0018] After a section of the exhaust pipe insert is inserted into one end of the exhaust pipe boss, the joint between the outer wall of the exhaust pipe insert and one end of the exhaust pipe boss is fully welded, and the exhaust pipe boss is welded to the rear casing of the high-pressure compressor.

[0019] Furthermore, an inner wall plate and an outer wall plate are provided at the rear portion of the rear casing of the high pressure compressor;

[0020] The space between the inner wall plate and the outer wall plate forms the outlet of the main flow channel.

[0021] Beneficial effects:

[0022] 1) The present invention is a part of the gas turbine structure and provides a new idea and design scheme for the development of gas turbines.

[0023] 2) The present invention has a simple structure and stable strength, which greatly reduces the time and difficulty of assembling the rear casing of the high-pressure compressor.

[0024] 3) The present invention has high feasibility, reasonable structure, high safety, and comprehensive consideration of the structures of various parts of the gas turbine and the oil and gas system, and has a wide range of applications.

[0025] 4) The present invention fully considers the requirements for normal operation of different working fluids in the rear casing pipeline in the engine, adopts a reasonable structure to ensure the physical parameters of the working fluid, and ensures the efficiency and safety of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the layout of the rear casing of a gas turbine that is commonly used now;

[0027] Figure 2 yes Figure 1 Schematic diagram of exhaust pipe;

[0028] Figure 3 It is a front view of a pipeline arrangement structure of a rear casing of a high-pressure compressor of a small and medium-sized gas turbine according to the present invention;

[0029] Figure 4 It is a rear view of a pipeline arrangement structure of a rear casing of a high-pressure compressor of a small and medium-sized gas turbine according to the present invention;

[0030] Figure 5 This is a cross-sectional view of the lubricating oil supply pipe;

[0031] Figure 6 This is a cross-sectional view of the lubricating oil return pipe.

[0032] Figure 7 It is a cross-sectional view of the gas supply pipe;

[0033] Figure 8 This is a cross-sectional view of the exhaust pipe. DETAILED DESCRIPTION

[0034] Specific implementation method 1: A pipeline arrangement structure of a high-pressure compressor rear casing of a small and medium-sized gas turbine, which includes a high-pressure compressor rear casing 8, a front flange 7, a lubricating oil supply pipe 1, an air supply pipe 4, two lubricating oil return pipes 6, four exhaust pipes 2 and a plurality of reinforcing ribs 5;

[0035] Eight support grooves 3 are evenly distributed on the outer ring of the high-pressure compressor rear casing 8, and the lubricating oil supply pipe 1, the air supply pipe 4, the two lubricating oil return pipes 6 and the four exhaust pipes 2 are respectively fixedly connected to a support groove 3, and the front of the high-pressure compressor rear casing 8 is fixedly connected to the front flange 7 through multiple reinforcing ribs 5. The space between the high-pressure compressor rear casing 8 and the front flange 7 forms a main flow channel 9, and the outer ring of the front flange 7 is provided with eight notches, and the lubricating oil supply pipe 1, the air supply pipe 4, the two lubricating oil return pipes 6 and the four exhaust pipes 2 are respectively located in a notch. During operation, the high-temperature and high-pressure gas blows through the main flow channel 9, and the medium flowing through the lubricating oil supply pipe 1, the air supply pipe 4, the two lubricating oil return pipes 6 and the four exhaust pipes 2 flows through the support groove 3 and enters the high-pressure compressor rear casing 8 for heat exchange.

[0036] In this embodiment: the lubricating oil supply pipe is used to facilitate the lubricating oil from the outside to enter the bearing at the center bearing seat of the unit. The lubricating oil flows from top to bottom into the casing under the action of gravity. The air is led out from the reducer at the outlet of the low-pressure compressor. The lubricating oil return pipe is used to recover the lubricating oil after lubricating the bearings of the unit, and is supplied to the casing of the rear casing of the high-pressure compressor through the air supply pipe for sealing and pressurization. Four exhaust pipes lead the gas from the rear casing of the high-pressure compressor and transport it to the second stage of the power turbine through external pipelines for sealing and pressurization. Optionally, two of the exhaust pipes are combined into one.

[0037] The circumferentially evenly arranged reinforcement ribs can, on the one hand, enhance the strength and rigidity of the receiver without increasing the wall thickness of the receiver. On the other hand, they can avoid the problem of uneven stress caused by the difference in wall thickness of the inner and outer receiver shells. Finally, they can also play an auxiliary positioning role when assembling the inner and outer receivers.

[0038] Specific implementation method 2: A pipeline arrangement structure of a high-pressure compressor rear casing of a small and medium-sized gas turbine, the number of the reinforcing ribs 4 is eight, and the eight reinforcing ribs are evenly distributed along the circumferential direction.

[0039] Other implementations are the same as the first specific implementation.

[0040] Specific implementation method three: A pipeline arrangement structure of a high-pressure compressor rear casing of a small and medium-sized gas turbine, the acute angle formed by the axis of the lubricating oil supply pipe 1 and the horizontal line is 33°45′.

[0041] In this embodiment: the lubricating oil supply pipe of the present invention is arranged above the unit to facilitate the lubricating oil from the outside to enter the bearing at the central bearing seat of the unit. The lubricating oil flows from top to bottom into the casing under the action of gravity. The acute angle formed by the central axis and the horizontal line is 33°45′, and the intervals between all other pipes are 45°.

[0042] The lubricating oil supply pipe is arranged on the upper left side to facilitate the oil in the lubricating oil supply pipe to flow from top to bottom into the pipe inside the casing under the action of gravity.

[0043] Other implementations are the same as the first specific implementation.

[0044] Specific embodiment 4: A pipeline arrangement structure of a high-pressure compressor rear casing of a small and medium-sized gas turbine, two lubricating oil return pipes 6 are located below the high-pressure compressor rear casing 8.

[0045] In this embodiment: the two lubricating oil return pipes are used to recover the lubricating oil after lubricating the unit bearings. These two oil return pipes need to be arranged below the unit to facilitate the lubricating oil at the unit center bearing to flow out of the casing along the lubricating oil return pipes under the action of gravity.

[0046] Other implementations are the same as the first specific implementation.

[0047] Specific embodiment 5: A piping arrangement structure of a high-pressure compressor rear casing of a small and medium-sized gas turbine, wherein the axis of the lubricating oil supply pipe 1, the axis of the air supply pipe 4, the axes of the two lubricating oil return pipes 6 and the axes of the four exhaust pipes 2 are all at an angle of 10° to the central axis of the high-pressure compressor rear casing 8.

[0048] In this embodiment: the angle between all the tubes of the present invention and the horizontal central axis is 10°. An angle that is too small with the central axis cannot make the tubes avoid the front flange in the axial direction. An angle that is too large with the central axis will cause the radial size of the gas turbine to increase and may interfere with the combustion chamber shell outside the rear casing.

[0049] Other implementations are the same as the first specific implementation.

[0050] Specific embodiment six: A pipeline arrangement structure of a high-pressure compressor rear casing of a small and medium-sized gas turbine, wherein the lubricating oil supply pipe 1 comprises a lubricating oil supply pipe inner pipe 1-1, a lubricating oil supply pipe outer pipe 1-2, a lubricating oil supply pipe boss 1-3 and a lubricating oil supply pipe intubation 1-4;

[0051] The inner tube 1-1 of the lubricating oil supply pipe is located inside the outer tube 1-2 of the lubricating oil supply pipe, and a gap is left between the inner tube 1-1 of the lubricating oil supply pipe and the outer tube 1-2 of the lubricating oil supply pipe. The outer wall of the outlet end of the inner tube 1-1 of the lubricating oil supply pipe is welded to the inner wall of the outer tube 1-2 of the lubricating oil supply pipe in a full circle. After a section of the outer tube 1-2 of the lubricating oil supply pipe is inserted into one end of the lubricating oil supply pipe boss 1-3, the outer wall of the outer tube 1-2 of the lubricating oil supply pipe and the joint of one end of the lubricating oil supply pipe boss 1-3 are welded in a full circle. The lubricating oil supply pipe insert 1-4 is connected to the other end of the lubricating oil supply pipe boss 1-3 and is integrally arranged. The lubricating oil supply pipe boss 1-3 is welded to the rear casing 8 of the high-pressure compressor. The lubricating oil supply pipe insert 1-4 is inserted into the support groove 3 and a gap is left between it and the support groove 3.

[0052] In this embodiment, the lubricating oil is supplied through the inner tube of the lubricating oil supply pipe. The advantage is that the lubricating oil from the outer tube of the lubricating oil supply pipe is relatively low in temperature, and its temperature should not exceed 50°C. The rear casing is close to the combustion chamber of the engine, and the temperature of the combustion chamber is very high. The assembly components are all metal and have good thermal conductivity. At this time, the thickness of the cavity must be ensured to be about 10mm.

[0053] The support groove is located in the main flow channel at the outlet of the high-pressure compressor. The air compressed by the low-pressure compressor and the high-pressure compressor has the characteristics of high temperature and high pressure, and the temperature can reach 500°C. In order to reduce the direct heat exchange between the main flow channel air and the lubricating oil supply pipe insert, a cavity is left between the support groove.

[0054] The outer tube of the lubricating oil supply pipe of the present invention is fixedly connected with the inner tube of the lubricating oil supply pipe by a full circle welding method, and the outer tube of the lubricating oil supply pipe is also fixedly connected with the lubricating oil supply pipe boss by a full circle welding method. In the past, the rear casing part is often connected by threads. Compared with threaded connection, welding connection can greatly improve the strength of the connection. The welding strength can reach or even exceed the strength of the parent material, avoiding the problem of weak strength of the threaded structure at the connection. At the same time, the welding structure has better sealing than the threaded structure, avoiding the problem of fluid leakage. Since the temperature difference between the engine when it is cold and rated operating conditions is large, in order to avoid the expansion and cracking between the components due to the influence of thermal expansion after welding, firstly, along the radial direction of the lubricating oil supply pipe, it should be ensured that there should be a gap of more than 1mm between the inner tube of the lubricating oil supply pipe and the wall surface of the outer tube of the lubricating oil supply pipe. At the same time, since the axial length of the lubricating oil supply pipe is long, the deformation size is large after the influence of thermal expansion, and a gap of about 3mm should be left between the outer tube of the lubricating oil supply pipe and the inner cavity of the lubricating oil supply pipe boss. At the same time, since different metals have different thermal expansion coefficients, in order to ensure the strength and stability of the welded structure, the inner tube of the lubricating oil supply pipe, the outer tube of the lubricating oil supply pipe and the lubricating oil supply pipe boss of the present invention should be made of the same metal material, using high-strength alloy material 1Cr12Ni3MoVN with excellent heat resistance and corrosion resistance.

[0055] Other implementations are the same as the first specific implementation.

[0056] Specific embodiment seven: A pipeline arrangement structure of a high-pressure compressor rear casing of a small and medium-sized gas turbine, wherein the lubricating oil return pipe 6 comprises a lubricating oil return pipe inner pipe 6-1, a lubricating oil return pipe outer pipe 6-2, a lubricating oil return pipe boss 6-3 and a lubricating oil supply pipe intubation 6-4;

[0057] The inner tube 6-1 of the lubricating oil return pipe is located inside the outer tube 6-2 of the lubricating oil return pipe, and a gap is left between the inner tube 6-1 of the lubricating oil return pipe and the outer tube 6-2 of the lubricating oil return pipe. The end of the outer tube 6-2 of the lubricating oil return pipe is sleeved on the outer wall of the inner tube 6-1 of the lubricating oil return pipe. After a section of the inner tube 6-1 of the lubricating oil return pipe is inserted into one end of the lubricating oil return pipe boss 6-3, the outer wall of the inner tube 6-1 of the lubricating oil return pipe and one end of the lubricating oil return pipe boss 6-3 are welded in a whole circle. The lubricating oil supply pipe insert 6-4 is welded to the other end of the lubricating oil return pipe boss 6-3. The lubricating oil return pipe boss 6-3 is welded to the rear casing 8 of the high-pressure compressor. The lubricating oil supply pipe insert 6-4 is located in the support groove 3 and a gap is left between it and the support groove 3.

[0058] In this embodiment: due to the presence of the inner and outer tube cavities, the heat conduction of the outer tube of the lubricating oil return pipe and the inner tube of the lubricating oil return pipe is changed from solid metal heat conduction to gas heat conduction, which greatly reduces the thermal conductivity coefficient. The high temperature of the outer tube of the lubricating oil is not easily transferred to the inner tube, thereby ensuring a lower lubricating oil temperature in the inner tube.

[0059] The support groove is located in the main flow channel at the outlet of the high-pressure compressor. The air compressed by the low-pressure compressor and the high-pressure compressor has the characteristics of high temperature and high pressure, and the temperature can reach 500°C. In order to reduce the direct heat exchange between the main flow channel air and the lubricating oil return pipe insert, a cavity is left between the support groove.

[0060] Other implementations are the same as the first specific implementation.

[0061] Specific embodiment eight: A pipeline arrangement structure of a high-pressure compressor rear casing of a small and medium-sized gas turbine, wherein the air supply pipe 4 includes an air supply pipe inner pipe 4-1, an air supply pipe outer pipe 4-2, an air supply pipe boss 4-3 and an air supply pipe intubation pipe 4-4;

[0062] The inner tube 4-1 of the air supply pipe is located inside the outer tube 4-2 of the air supply pipe, with a gap left between them. The end of the outer tube 4-2 of the air supply pipe is sleeved on the outer wall of the inner tube 4-1 of the air supply pipe. After a section of the inner tube 4-1 of the air supply pipe is inserted into one end of the air supply pipe boss 4-3, the outer wall of the inner tube 4-1 of the air supply pipe and one end of the air supply pipe boss 4-3 are welded in a whole circle. The air supply pipe insert 4-4 is welded to the other end of the air supply pipe boss 4-3. The air supply pipe boss 4-3 is welded to the rear casing 8 of the high-pressure compressor. The air supply pipe insert 4-4 is located in the support groove 3 and with a gap left between it and the support groove 3.

[0063] In this embodiment: the structures of the lubricating oil return pipe and the air supply pipe of the present invention are basically the same, the difference is that the working fluids inside are lubricating oil and compressed air respectively, and the inner and outer pipe structures are adopted for arrangement to reduce the heat absorbed by the lubricating oil inside the oil return pipe and the air from the low-pressure reducer inside the air supply pipe from the external environment, thereby ensuring lower lubricating oil and air temperatures.

[0064] Other implementations are the same as the first specific implementation.

[0065] Specific embodiment nine: A pipeline arrangement structure of a high-pressure compressor rear casing of a small and medium-sized gas turbine, wherein the exhaust pipe 2 includes an exhaust pipe insert 2-1 and an exhaust pipe boss 2-2;

[0066] After a section of the exhaust pipe insert 2-1 is inserted into one end of the exhaust pipe boss 2-2, the outer wall of the exhaust pipe insert 2-1 and one end of the exhaust pipe boss 2-2 are welded in a whole circle, and the exhaust pipe boss 2-2 is welded to the rear casing 8 of the high-pressure compressor.

[0067] In this embodiment: the exhaust pipe of the present invention is different from the lubricating oil pipe and the air supply pipe. The temperature of the compressed air inside the exhaust pipe is relatively high, and there is no need to worry about the influence of the external temperature on the exhaust temperature. A simple single-layer pipe structure is adopted.

[0068] Other implementations are the same as the first specific implementation.

[0069] Specific embodiment 10: A pipeline arrangement structure of a high-pressure compressor rear casing of a small and medium-sized gas turbine, wherein an inner wall plate 10 and an outer wall plate 11 are arranged at the rear of the high-pressure compressor rear casing 8;

[0070] The space between the inner wall plate 10 and the outer wall plate 11 forms the outlet of the main flow channel 9 .

[0071] In this embodiment: the lubricating oil supply pipe boss, lubricating oil return pipe boss, air supply pipe boss, exhaust pipe boss and support groove wall plate are inserted into the outer wall plate and the inner wall plate of the component in the radial direction, and are vertically downward in the cross section shown in the figure. Different from the usual arrangement of the pipeline in the casing at a certain angle, the radial arrangement can make the structure of the rear casing part more compact and reduce the axial size of the engine. Since the lower end surface of various bosses and the upper end surface of the rear casing of the high-pressure compressor are in the main flow channel of the rear casing of the high-pressure compressor, in order to ensure the stability of the high-pressure airflow after the guide vane and the efficiency of the compressor, their shapes should be completely consistent with the shape of the rear casing flow channel, and should not protrude from the main flow channel by more than 0.5mm at most.

[0072] Other implementations are the same as the first specific implementation.

Claims

1. A pipeline arrangement structure of a high-pressure compressor rear casing of a small or medium-sized gas turbine, characterized in that: It comprises a high-pressure compressor rear casing (8), a front flange (7), a lubricating oil supply pipe (1), an air supply pipe (4), two lubricating oil return pipes (6), four exhaust pipes (2) and a plurality of reinforcing ribs (5); Eight support grooves (3) are evenly arranged on the outer ring of the high-pressure compressor rear casing (8); the lubricating oil supply pipe (1), the air supply pipe (4), the two lubricating oil return pipes (6) and the four exhaust pipes (2) are respectively fixedly connected to one support groove (3); the front of the high-pressure compressor rear casing (8) is fixedly connected to the front flange (7) through a plurality of reinforcing ribs (5); the space between the high-pressure compressor rear casing (8) and the front flange (7) forms a main flow channel (9); the outer ring of the front flange (7) is provided with eight notches; the lubricating oil supply pipe (1), the air supply pipe (4), the two lubricating oil return pipes (6) and the four exhaust pipes (2) are respectively located in one notch; when working, high-temperature and high-pressure gas blows through the main flow channel (9); the medium flowing through the lubricating oil supply pipe (1), the air supply pipe (4), the two lubricating oil return pipes (6) and the four exhaust pipes (2) flows through the support groove (3) and enters the high-pressure compressor rear casing (8) for heat exchange.

2. The pipeline arrangement structure of the high-pressure compressor rear casing of a small and medium-sized gas turbine according to claim 1 is characterized in that: The number of the reinforcing ribs (4) is eight, and the eight reinforcing ribs are evenly distributed along the circumferential direction.

3. The pipeline arrangement structure of the high-pressure compressor rear casing of a small and medium-sized gas turbine according to claim 1 is characterized in that: The acute angle formed by the axis of the lubricating oil supply pipe (1) and the horizontal line is 33°45′.

4. The pipeline arrangement structure of the high-pressure compressor rear casing of a small and medium-sized gas turbine according to claim 1 is characterized in that: Two lubricating oil return pipes (6) are located below the rear casing (8) of the high-pressure compressor.

5. The pipeline arrangement structure of the high-pressure compressor rear casing of a small and medium-sized gas turbine according to claim 1 is characterized in that: The axis of the lubricating oil supply pipe (1), the axis of the air supply pipe (4), the axes of the two lubricating oil return pipes (6) and the axes of the four exhaust pipes (2) are all at an angle of 10° to the central axis of the high-pressure compressor rear casing (8).

6. The pipeline arrangement structure of the high-pressure compressor rear casing of a small and medium-sized gas turbine according to claim 1 is characterized in that: The lubricating oil supply pipe (1) comprises a lubricating oil supply pipe inner pipe (1-1), a lubricating oil supply pipe outer pipe (1-2), a lubricating oil supply pipe boss (1-3) and a lubricating oil supply pipe insert pipe (1-4); The inner tube (1-1) of the lubricating oil supply pipe is located inside the outer tube (1-2) of the lubricating oil supply pipe, a gap is left between the inner tube (1-1) of the lubricating oil supply pipe and the outer tube (1-2), the outer wall of the outlet end of the inner tube (1-1) of the lubricating oil supply pipe is welded to the inner wall of the outer tube (1-2) of the lubricating oil supply pipe in a whole circle, and after a section of the outer tube (1-2) of the lubricating oil supply pipe is inserted into one end of the lubricating oil supply pipe boss (1-3), the lubricating oil supply pipe is The outer wall of the outer tube (1-2) and one end of the lubricating oil supply pipe boss (1-3) are welded in a whole circle, the lubricating oil supply pipe insert (1-4) is connected to the other end of the lubricating oil supply pipe boss (1-3) and is integrally arranged, the lubricating oil supply pipe boss (1-3) is welded to the high-pressure compressor rear casing (8), and the lubricating oil supply pipe insert (1-4) is inserted into the support groove (3) and a gap is left between the support groove (3).

7. The pipeline arrangement structure of the high-pressure compressor rear casing of a small and medium-sized gas turbine according to claim 1 is characterized in that: The lubricating oil return pipe (6) comprises a lubricating oil return pipe inner pipe (6-1), a lubricating oil return pipe outer pipe (6-2), a lubricating oil return pipe boss (6-3) and a lubricating oil supply pipe insert pipe (6-4); The inner tube (6-1) of the lubricating oil return pipe is located inside the outer tube (6-2) of the lubricating oil return pipe, and a gap is left between the inner tube (6-1) of the lubricating oil return pipe and the outer tube (6-2) of the lubricating oil return pipe. The end of the outer tube (6-2) of the lubricating oil return pipe is sleeved on the outer wall of the inner tube (6-1) of the lubricating oil return pipe. After a section of the inner tube (6-1) of the lubricating oil return pipe is inserted into one end of the lubricating oil return pipe boss (6-3), the outer wall of the inner tube (6-1) of the lubricating oil return pipe and one end of the lubricating oil return pipe boss (6-3) are welded in a whole circle. The lubricating oil supply pipe insert (6-4) is welded to the other end of the lubricating oil return pipe boss (6-3). The lubricating oil return pipe boss (6-3) is welded to the rear casing (8) of the high-pressure compressor. The lubricating oil supply pipe insert (6-4) is located in the support groove (3) and a gap is left between the support groove (3).

8. The pipeline arrangement structure of the high-pressure compressor rear casing of a small and medium-sized gas turbine according to claim 1 is characterized in that: The air supply pipe (4) comprises an air supply pipe inner pipe (4-1), an air supply pipe outer pipe (4-2), an air supply pipe boss (4-3) and an air supply pipe intubation pipe (4-4); The inner tube (4-1) of the air supply pipe is located inside the outer tube (4-2) of the air supply pipe, and a gap is left between the inner tube (4-1) and the outer tube (4-2). The end of the outer tube (4-2) of the air supply pipe is sleeved on the outer wall of the inner tube (4-1) of the air supply pipe. After a section of the inner tube (4-1) of the air supply pipe is inserted into one end of the air supply pipe boss (4-3), the outer wall of the inner tube (4-1) of the air supply pipe and one end of the air supply pipe boss (4-3) are welded in a whole circle. The air supply pipe insert tube (4-4) is welded to the other end of the air supply pipe boss (4-3), and the air supply pipe boss (4-3) is welded to the rear casing (8) of the high-pressure compressor. The air supply pipe insert tube (4-4) is located in the support groove (3) and a gap is left between the support groove (3).

9. The pipeline arrangement structure of the high-pressure compressor rear casing of a small and medium-sized gas turbine according to claim 1, characterized in that: The exhaust pipe (2) comprises an exhaust pipe insert (2-1) and an exhaust pipe boss (2-2); After a section of the exhaust pipe insert (2-1) is inserted into one end of the exhaust pipe boss (2-2), the outer wall of the exhaust pipe insert (2-1) and one end of the exhaust pipe boss (2-2) are welded in a whole circle, and the exhaust pipe boss (2-2) is welded to the high-pressure compressor rear casing (8).

10. The pipeline arrangement structure of the high-pressure compressor rear casing of a small and medium-sized gas turbine according to claim 1, characterized in that: An inner wall plate (10) and an outer wall plate (11) are arranged at the rear of the high pressure compressor rear casing (8); The space between the inner wall plate (10) and the outer wall plate (11) forms the outlet of the main flow channel (9).

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