Flexible pipe for cooling gas turbine rotor and manufacturing method thereof

Abstract

The invention provides a flexible pipe for cooling a gas turbine rotor and a manufacturing method of the flexible pipe, and belongs to the field of flexible pipes. The flexible pipe comprises a flexible section, connecting pipes arranged at the two ends of the flexible section and end flanges arranged at the ends of the connecting pipes. The flexible section, the connecting pipe and the end flange are connected through welding; the flexible section adopts a double-layer winding pipe structure and adopts conical surface matching, and a discontinuous structure adjusting ring is used for fixing the end part of a winding pipe; the inner winding pipe is installed and fixed through the threaded pipe and the inner pressing ring in a threaded mode, and later disassembly, assembly and replacement are facilitated; the outer ring metal winding pipe is of a welding fixing structure. The flexible section is convenient to disassemble and good in sealing performance, temperature rise is small when fluid passes through the flexible section, power consumption of a peripheral cooler is small, heat conduction is low, and deformation is not prone to occurring.

Description

Technical Field

[0001] The invention relates to the field of flexible pipes, and in particular to a flexible pipe for cooling a gas turbine rotor and a manufacturing method thereof. Background Art

[0002] With the continuous development of gas turbine technology, the ultra-high thermal efficiency of gas turbines is the pursuit of new units. In order to improve the overall thermal efficiency of the gas turbine, the temperature before the turbine is also increasing. The turbine blades are in an extremely high temperature environment. At present, the increase in the allowable temperature of the material alone can no longer meet the actual use needs. It is required that the turbine blades must adopt a new air film cooling method. The cooling air for the turbine blades generally comes from the compressor exhaust. As the cooling requirements become higher and higher, the exhaust volume demand is also increasing under the condition of a certain exhaust temperature, which will inevitably lead to a decrease in the thermal efficiency of the gas turbine.

[0003] Therefore, a method of extracting air from the compressor and cooling it externally before cooling the turbine rotor and blades is widely used. This method can not only improve the cooling efficiency, but also avoid the influence of the exhaust flow rate on the overall efficiency. The inevitable problem of this cooling method is how to effectively introduce the cooled compressor exhaust air into the rotor. Existing solutions include Figure 1 As shown, the combustion cylinder a2 and the torque tube cover a3 are connected by the support rib a31 on the torque tube cover. The air is extracted from the compressor exhaust chamber through the turbine cylinder b1, cooled by the cooler d1, and transported to the rotor cooling chamber through the combustion cylinder a2 and the torque tube cover a3 through the flexible tube e to cool the rotor c1.

[0004] In the scheme where the air from the compressor exhaust chamber is extracted and cooled by an external cooler before being cooled by the turbine rotor, the cooling air needs to pass through the double-layer cylinder of the combustion cylinder a2 and the torque tube cover a3, and is arranged at the compressor outlet. The flexible tube e that transmits the cooling air is in a harsh working environment. At the same time, since the transmission medium directly enters the interior of the rotor, the reliability requirements of the flexible tube e are extremely high. How to balance the thermal displacement of the double-layer cylinder (compression cylinder a2 and torque tube cover a3) while having high reliability is the core of the structural design of the rotor cooling scheme. At the same time, the flexible tube e connects the combustion cylinder a2 and the torque tube cover a3. During the overhaul of the unit, it is inevitable that they need to be frequently disassembled and assembled, which puts forward requirements for the convenience of disassembly and assembly of the flexible tube. Based on this, the design of the flexible tube must have the following characteristics at the same time:

[0005] (1) High reliability: Under the influence of external airflow impact, internal airflow impact, internal and external pressure changes and cylinder vibration, the flexible pipe must have high reliability within at least one overhaul cycle;

[0006] (2) Flexibility: The flexible tube connects the combustion cylinder a2 and the torque tube cover a3 and must be able to overcome the displacement and torsion of the two during the operation of the gas turbine;

[0007] (3) Low heat transfer: As a component for transporting rotor cooling air, the internal fluid will be heated when passing through the external high-temperature gas. To ensure the safe operation and overall efficiency of the unit, the cooling air must not have a temperature rise of more than 20°C after passing through the flexible pipe, and the lower the better;

[0008] (4) Sealing: After passing through the external air pipeline and cooler d1, the air pressure in the flexible tube will be significantly lower than the gas pressure in the external compressor exhaust chamber, and the temperature is also much lower than the compressor exhaust temperature. A small amount of gas leakage can cause the cooling air temperature in the flexible tube to increase significantly. Therefore, it is necessary to ensure that the flexible tube has good sealing under various working conditions;

[0009] (5) Convenience of disassembly and assembly: With the overhaul of the unit, the flexible pipe needs to be frequently disassembled and assembled, and the flexible pipe needs to be easy to disassemble and assemble.

[0010] The existing units use two types of structures: bellows and single-layer winding tubes. Different types of structures have different problems in use. Figure 2 and Figure 3 The bellows structure is as shown. Figure 2 As shown in the figure, in actual use, the fluid temperature is too high, the deformation is serious during long-term operation, the torsion failure is obvious during use, and the use effect is poor. Figure 3 As shown, in actual use, due to partial leakage in the winding tube, the temperature of the fluid increases more when passing through, and the peripheral cooler consumes more power. Summary of the invention

[0011] In order to solve the technical problems existing in the prior art, the present invention provides a flexible pipe for cooling a gas turbine rotor, comprising: a flexible section, a pipe disposed at both ends of the flexible section, and an end flange disposed at the end of the pipe; the flexible section, the pipe and the end flange are connected by welding; the flexible section adopts a double-layer winding pipe structure, and the flexible section adopts a conical surface fit and a discontinuous structure adjustment ring to fix the end of the winding pipe; the inner winding pipe is fixed by threaded installation through the threaded pipe and the inner pressure ring, which is convenient for later disassembly and replacement; the outer ring metal winding pipe adopts a welding fixing structure. The flexible section of the present invention is easy to disassemble, has good sealing performance, has a small temperature rise when the fluid passes through, consumes less power of the peripheral cooler, has low heat conduction, and is not easy to deform.

[0012] The present invention provides a flexible pipe for cooling a gas turbine rotor, comprising: a flexible section, a pipe provided at both ends of the flexible section, and an end flange provided at the end of the pipe; the flexible section, the pipe and the end flange are connected by welding;

[0013] The flexible section includes a piping, a threaded pipe, an inner liner, an inner winding pipe fixing assembly, an outer winding pipe fixing assembly, and a sealing assembly. The piping is arranged at one end of the threaded pipe and connected to the connecting pipe. The inner liner is arranged inside the threaded pipe. An inner winding pipe is arranged between the inner liner and the threaded pipe. The sealing assembly is arranged in the gap between the inner liner, the threaded pipe, the inner winding pipe and the inner winding pipe fixing assembly for sealing. An outer winding pipe is arranged outside the inner winding pipe, a separating ring is arranged between the inner winding pipe and the outer winding pipe, the inner winding pipe fixing assembly is arranged between the inner winding pipe and the separating ring, and the outer winding pipe fixing assembly is arranged outside the outer winding pipe. Both the inner winding pipe fixing assembly and the outer winding pipe fixing assembly have a conical surface for adjusting the degree of fixing.

[0014] Preferably, the outer winding tube fixing assembly includes an outer adjustment ring and an outer pressure ring, the outer adjustment ring is sleeved on the outer wall of the outer winding tube, the outer pressure ring is sleeved on the outer wall of the outer adjustment ring from the middle part of the outer adjustment ring, and extends out from the end of the outer adjustment ring away from the connecting pipe.

[0015] Preferably, the inner winding tube fixing assembly includes an inner fixing ring, an inner adjustment ring and an inner pressure ring. The inner fixing ring is sleeved between the threaded tube and the inner winding tube to fix the inner winding tube. The inner adjustment ring is sleeved on the outer wall of the inner fixing ring away from the sealing member at one end, and the end face is abutted against the inner fixing ring. The inner pressure ring is sleeved between the separating ring and the threaded tube and wraps around the outer wall of the inner adjustment ring. The threaded tube has an external thread, and the inner pressure ring has an internal thread matching it.

[0016] Preferably, the contact surfaces between the inner adjustment ring and the inner pressure ring both have conical surfaces with the same angle; and the contact surfaces between the outer adjustment ring and the outer pressure ring both have conical surfaces with the same angle.

[0017] Preferably, a gasket is provided at a gap formed after the threaded pipe and the inner pressure ring are threadedly connected.

[0018] Preferably, the conical surfaces of the inner adjustment ring and the outer adjustment ring are respectively provided with evenly distributed grooves of the same or different sizes.

[0019] Preferably, a groove matching the groove of the inner winding tube is provided on the outer wall of the lining.

[0020] Preferably, the sealing assembly includes a first sealing ring and a second sealing ring, the inner diameter of the first sealing ring is smaller than that of the second sealing ring, the first sealing ring is sleeved between the liner and the inner winding tube, and the two end faces are respectively abutted against the liner and the inner winding tube, the outer side of the first sealing ring is sealedly connected to the interior of the threaded tube, and the inner wall of the first sealing ring is sealedly connected to the outer wall of the liner; the second sealing ring is arranged between the first sealing ring and the inner winding tube fixing assembly, and the two end faces are respectively abutted against the first sealing ring and the inner winding tube fixing assembly, the outer side of the second sealing ring is sealedly connected to the interior of the threaded tube, and the inner wall of the second sealing ring is sealedly connected to the outer wall of the inner winding tube.

[0021] Preferably, the second sealing ring is arranged between the inner fixing ring and the first sealing ring, and two end surfaces of the second sealing ring abut against the inner fixing ring and the first sealing ring.

[0022] The present invention also provides a method for manufacturing the above-mentioned gas turbine rotor cooling flexible pipe, comprising the following steps:

[0023] S1, firstly weld the pipe, the threaded pipe and the liner into one piece as required;

[0024] S2, sequentially inserting the first sealing ring and the inner winding tube and installing them in place;

[0025] S3, inserting the second sealing ring and inserting it into the inner fixing ring;

[0026] S4, installing the inner adjustment ring, screwing the inner pressure ring into the outer thread of the threaded pipe and tightening it, paying attention to the torque during the tightening process, and when the set value is reached, it is considered that the inner adjustment ring has been squeezed into place, and the tightening action is stopped;

[0027] S5, inserting the gasket, and welding the inner pressure ring, the threaded pipe and the gasket;

[0028] S6, welding the separation ring and all components obtained by step S5 into one;

[0029] S7, inserting the outer winding tube and the outer adjustment ring in sequence, and welding and fixing them in place;

[0030] S9, inserting the outer pressure ring, and striking the outer pressure ring, so that the outer pressure ring and the conical surface of the outer adjustment ring are squeezed;

[0031] S9, welding the outer pressure ring and the outer adjustment ring to complete the manufacturing of the flexible section;

[0032] S10, welding the connecting pipe, the flexible section manufactured in step S9 and the end flange to complete the manufacture of the flexible pipe for cooling the gas turbine rotor.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0034] 1. High reliability

[0035] (a) The flexible section of the present invention adopts a double-layer metal winding tube structure. The metal winding tube itself has higher impact resistance than the corrugated tube. The double-layer structure can reduce the risk of single-layer damage due to heat load;

[0036] (b) The present invention adopts a double-layer metal winding tube structure, and both the inner and outer winding tubes adopt conical surface matching and discontinuous structure adjustment rings to clamp the ends of the metal winding tubes. Effective end clamping can keep the winding tube in a stable working state and increase the reliability of the connection;

[0037] (c) For the fixation of the double-layer metal winding pipe, a slot is provided in the inner lining to increase the fixation of the end of the inner winding pipe, and the outer winding pipe is fixed by welding, and the fixing method is reliable.

[0038] By increasing the number of flexible section layers and changing the fixing method, the reliability of the flexible pipe of the present invention is increased. According to theoretical calculations, the stress level of the double-layer winding pipe structure is reduced by 25% and 50% compared with the single-layer welded winding pipe structure and the corrugated pipe structure under the same operating conditions.

[0039] 2. Can absorb large axial displacement and torsion

[0040] The flexible section of the present invention adopts a double-layer metal winding tube structure. The axial displacement of the winding tube is determined according to the pitch. Under a length of 330mm, the axial displacement of the winding tube structure can be 10mm and the rotation angle is not greater than 5°. Compared with the bellows that can only absorb axial displacement and easily cause the bellows to fail due to torsion, it has better performance.

[0041] 3. Low heat transfer and leakage performance

[0042] The flexible section of the present invention adopts a double-layer metal winding tube structure, and a nearly closed chamber is formed between the inner and outer winding tubes, which greatly reduces the comprehensive heat transfer coefficient; the double-layer structure doubles the number of leakage airflow throttling points, and the flow resistance is greater, which significantly reduces the probability of compressor exhaust leakage entering the flexible tube. Compared with the single-layer welded winding tube structure under the same pressure and temperature conditions, the temperature rise of the cooling air per unit mass flow is reduced by about 70%.

[0043] 4. Easy to disassemble and replace

[0044] The present invention adopts a double-layer metal winding tube structure, and the double layers are fixed by different types. When the inner and outer layers of the flexible section are damaged, the entire section can be directly replaced, or the inner and outer layers can be replaced separately, thereby reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of introducing the cooled compressor exhaust air into the rotor in the prior art;

[0046] Figure 2 It is a schematic diagram of a bellows structure commonly used in the prior art;

[0047] Figure 3 This is a schematic diagram of a winding pipe structure commonly used in the prior art;

[0048] Figure 4 is a schematic half-section diagram of a gas turbine rotor cooling flexible pipe according to an embodiment of the present invention;

[0049] Figure 5 is a schematic half-section diagram of a portion of a flexible section according to an embodiment of the present invention;

[0050] Figure 6 is a longitudinal cross-sectional schematic diagram of an outer adjustment ring of an embodiment of the present invention;

[0051] Figure 7 is a longitudinal cross-sectional schematic diagram of an inner adjustment ring according to an embodiment of the present invention;

[0052] Figure 8 is a partial schematic diagram of a lining portion of an embodiment of the present invention;

[0053] Fig. 9 yes Figure 8 A partial enlarged view of the middle A part;

[0054] In the figure, 01-end flange, 02-connecting pipe, 03-flexible section, 031-piping, 032-threaded pipe, 033-lining, 034-first sealing ring, 035-second sealing ring, 036-inner winding pipe, 037-inner fixing ring, 132-separating ring, 135-gasket, 136-outer winding pipe, 038-inner adjustment ring, 039-inner pressure ring, 138-outer adjustment ring, 139-outer pressure ring; a1-compressor cylinder, a2-compression cylinder, a3-torque tube cover, a31-strut, b1-turbine cylinder, c1-rotor, d1-cooler, e-flexible pipe.

[0055] In addition, the drawings only show the cross-section of the flexible tube, but this does not constitute a limitation on the three-dimensional structure of the flexible tube. Figure 4 and Figure 5 The solid black part in the figure represents the weld. DETAILED DESCRIPTION

[0056] According to a specific embodiment of the present invention, Figure 4-9 The technical solution of the present invention is further described.

[0057] The present invention provides a flexible pipe for cooling a gas turbine rotor, comprising: a flexible section 03, a pipe 02 arranged at both ends of the flexible section 03, and an end flange 01 arranged at the end of the pipe 02; the flexible section 03, the pipe 02 and the end flange 01 are connected by welding;

[0058] The flexible section 03 includes a piping 031, a threaded pipe 032, an inner liner 033, an inner winding pipe 036 fixing component, an outer winding pipe 136 fixing component, and a sealing component. The inner winding pipe and the outer winding pipe can be selected from metal winding pipes; the piping 031 is arranged at one end of the threaded pipe 032 and connected to the connecting pipe 02, the inner liner 033 is arranged inside the threaded pipe 032, an inner winding pipe 036 is arranged between the inner liner 033 and the threaded pipe 032, and the sealing component is arranged on the inner liner 033, the threaded pipe 032, the inner winding pipe 036 fixing component, and the sealing component. The gap between the winding tube 036 and the inner winding tube 036 fixing component is sealed; an outer winding tube 136 is arranged outside the inner winding tube 036, a separating ring 132 is arranged between the inner winding tube 036 and the outer winding tube 136, the inner winding tube 036 fixing component is arranged between the inner winding tube 036 and the separating ring 132, and the outer winding tube 136 fixing component is arranged outside the outer winding tube 136, and both the inner winding tube 036 fixing component and the outer winding tube 136 fixing component have a conical surface for adjusting the degree of fixation.

[0059] According to a specific embodiment of the present invention, the outer winding tube 136 fixing assembly includes an outer adjustment ring 138 and an outer pressure ring 139. The outer adjustment ring 138 is sleeved on the outer wall of the outer winding tube 136. The outer pressure ring 139 is sleeved from the middle of the outer adjustment ring 138 on the outer wall of the outer adjustment ring 138 and extends out from the end of the outer adjustment ring 138 away from the connecting pipe 02.

[0060] According to a specific embodiment of the present invention, the inner winding tube 036 fixing assembly includes an inner fixing ring 037, an inner adjustment ring 038, and an inner pressure ring 039. The inner fixing ring 037 is sleeved between the threaded tube 032 and the inner winding tube 036 to fix the inner winding tube 036. The inner adjustment ring 038 is sleeved on the outer wall of the inner fixing ring 037 away from the sealing element at one end, and the end face is against the inner fixing ring 037. The inner pressure ring 039 is sleeved between the separating ring 132 and the threaded tube 032 and wraps the outer wall of the inner adjustment ring 038. The threaded tube 032 has an external thread, and the inner pressure ring 039 has an internal thread matching it, so that the inner winding tube is threadedly installed and fixed, which is convenient for later disassembly and replacement.

[0061] According to a specific embodiment of the present invention, the contact surfaces between the inner adjustment ring 038 and the inner pressure ring 039 both have conical surfaces with the same angle; the contact surfaces between the outer adjustment ring 138 and the outer pressure ring 139 both have conical surfaces with the same angle.

[0062] According to a specific embodiment of the present invention, a gasket 135 is provided at a gap formed after the threaded connection between the threaded tube 032 and the inner pressure ring 039 .

[0063] According to a specific embodiment of the present invention, the conical surfaces of the inner adjustment ring 038 and the outer adjustment ring 138 are respectively provided with grooves of the same or different sizes and evenly distributed, presenting an overall discontinuous structure of the inner adjustment ring 038 and the outer adjustment ring 138, so as to ensure a better fixing effect of the winding tube, for example, Figure 6 and Figure 7 The groove size of the inner adjustment ring 038 is shown as a0*b0, and the groove size of the outer adjustment ring 138 is a1*b1.

[0064] According to a specific embodiment of the present invention, a groove matching the groove of the inner winding tube 036 is provided on the outer wall of the inner liner 033 to ensure that the inner ring winding tube is installed more firmly.

[0065] According to a specific embodiment of the present invention, the sealing assembly includes a first sealing ring 034 and a second sealing ring 035, the inner diameter of the first sealing ring 034 is smaller than that of the second sealing ring 035, the first sealing ring 034 is sleeved between the liner 033 and the inner winding tube 036, and the two end faces are respectively abutted against the liner 033 and the inner winding tube 036, the outer side of the first sealing ring 034 is sealedly connected to the interior of the threaded tube 032, and the inner wall of the first sealing ring 034 is sealedly connected to the outer wall of the liner 033; the second sealing ring 035 is arranged between the first sealing ring 034 and the inner winding tube 036 fixing assembly, and the two end faces are respectively abutted against the first sealing ring 034 and the inner winding tube 036 fixing assembly, the outer side of the second sealing ring 035 is sealedly connected to the interior of the threaded tube 032, and the inner wall of the second sealing ring 035 is sealedly connected to the outer wall of the inner winding tube 036.

[0066] According to a specific embodiment of the present invention, the second sealing ring 035 is disposed between the inner fixing ring 037 and the first sealing ring 034 , and two end surfaces thereof abut against the inner fixing ring 037 and the first sealing ring 034 .

[0067] The present invention also provides a method for manufacturing the above-mentioned gas turbine rotor cooling flexible pipe, comprising the following steps:

[0068] S1, firstly weld the pipe 031, the threaded pipe 032 and the lining 033 into one piece as required;

[0069] S2, sequentially install the first sealing ring 034 and the inner winding tube 036 and install them in place;

[0070] S3, insert the second sealing ring 035 and insert it into the inner fixing ring 037;

[0071] S4, install the inner adjustment ring 038, and screw the inner pressure ring 039 into the outer thread of the threaded tube 032 and tighten it. Pay attention to the torque during the tightening process. When the set value is reached, it is considered that the inner adjustment ring 038 has been squeezed into place, and the tightening action is stopped;

[0072] S5, insert the gasket 135, and weld the inner pressure ring 039, the threaded tube 032 and the gasket 135;

[0073] S6, welding the separation ring 132 and all components obtained by step S5 into one;

[0074] S7, insert the outer winding tube 136 and the outer adjustment ring 138 in sequence, and weld and fix them in place;

[0075] S9, inserting the outer pressure ring 139, and striking the outer pressure ring 139, so that the outer pressure ring 139 and the conical surface of the outer adjustment ring 138 are squeezed;

[0076] S9, welding the outer pressure ring 139 and the outer adjustment ring 138 to complete the production of the flexible section 03;

[0077] S10, welding the connecting pipe 02, the flexible section 03 manufactured in step S9 and the end flange 01 to complete the manufacture of the flexible pipe for cooling the gas turbine rotor.

[0078] Example 1

[0079] The flexible pipe for cooling a gas turbine rotor of the present invention will be described in detail below according to a specific embodiment.

[0080] like Figure 4-5 The present invention provides a flexible pipe for cooling a gas turbine rotor, comprising: a flexible section 03, a pipe 02 arranged at both ends of the flexible section 03, and an end flange 01 arranged at the end of the pipe 02; the flexible section 03, the pipe 02 and the end flange 01 are connected by welding;

[0081] The flexible section 03 includes a pipe 031, a threaded pipe 032, an inner liner 033, an inner winding pipe 036 fixing component, an outer winding pipe 136 fixing component, and a sealing component. The pipe 031 is arranged at one end of the threaded pipe 032 and connected to the connecting pipe 02. The inner liner 033 is arranged inside the threaded pipe 032. An inner winding pipe 036 is arranged between the inner liner 033 and the threaded pipe 032. The sealing component is arranged on the inner liner 033, the threaded pipe 032, the inner winding pipe 036 and the outer winding pipe 136. The gap between the inner winding tube 036 fixing components is sealed; an outer winding tube 136 is arranged outside the inner winding tube 036, a separating ring 132 is arranged between the inner winding tube 036 and the outer winding tube 136, the inner winding tube 036 fixing component is arranged between the inner winding tube 036 and the separating ring 132, and the outer winding tube 136 fixing component is arranged outside the outer winding tube 136, and both the inner winding tube 036 fixing component and the outer winding tube 136 fixing component have a conical surface for adjusting the degree of fixing.

[0082] Example 2

[0083] The flexible pipe for cooling a gas turbine rotor of the present invention will be described in detail below according to a specific embodiment.

[0084] like Figure 4-9The present invention provides a flexible pipe for cooling a gas turbine rotor, comprising: a flexible section 03, a pipe 02 arranged at both ends of the flexible section 03, and an end flange 01 arranged at the end of the pipe 02; the flexible section 03, the pipe 02 and the end flange 01 are connected by welding;

[0085] The flexible section 03 includes a pipe 031, a threaded pipe 032, an inner liner 033, an inner winding pipe 036 fixing component, an outer winding pipe 136 fixing component, and a sealing component. The pipe 031 is arranged at one end of the threaded pipe 032 and connected to the connecting pipe 02. The inner liner 033 is arranged inside the threaded pipe 032. An inner winding pipe 036 is arranged between the inner liner 033 and the threaded pipe 032. The sealing component is arranged on the inner liner 033, the threaded pipe 032, the inner winding pipe 036 and the outer winding pipe 136. The gap between the inner winding tube 036 fixing components is sealed; an outer winding tube 136 is arranged outside the inner winding tube 036, a separating ring 132 is arranged between the inner winding tube 036 and the outer winding tube 136, the inner winding tube 036 fixing component is arranged between the inner winding tube 036 and the separating ring 132, and the outer winding tube 136 fixing component is arranged outside the outer winding tube 136, and both the inner winding tube 036 fixing component and the outer winding tube 136 fixing component have a conical surface for adjusting the degree of fixing.

[0086] Among them, the outer winding tube 136 fixing assembly includes an outer adjustment ring 138 and an outer pressure ring 139, the outer adjustment ring 138 is sleeved on the outer wall of the outer winding tube 136, and the outer pressure ring 139 is sleeved from the middle part of the outer adjustment ring 138 on the outer wall of the outer adjustment ring 138, and extends out from the end of the outer adjustment ring 138 away from the connecting pipe 02.

[0087] Among them, the inner winding tube 036 fixing assembly includes an inner fixing ring 037, an inner adjustment ring 038, and an inner pressure ring 039. The inner fixing ring 037 is sleeved between the threaded tube 032 and the inner winding tube 036 to fix the inner winding tube 036. The inner adjustment ring 038 is sleeved on the outer wall of the inner fixing ring 037 away from the seal at one end, and the end face is against the inner fixing ring 037. The inner pressure ring 039 is sleeved between the separating ring 132 and the threaded tube 032, and wraps the outer wall of the inner adjustment ring 038. The threaded tube 032 has an external thread, and the inner pressure ring 039 has an internal thread matching it.

[0088] Furthermore, the contact surfaces between the inner adjustment ring 038 and the inner pressure ring 039 both have conical surfaces with the same angle; the contact surfaces between the outer adjustment ring 138 and the outer pressure ring 139 both have conical surfaces with the same angle.

[0089] Wherein, a gasket 135 is provided at the gap formed after the threaded connection between the threaded tube 032 and the inner pressure ring 039.

[0090] The conical surfaces of the inner adjustment ring 038 and the outer adjustment ring 138 are respectively provided with uniformly distributed grooves of the same or different sizes, for example, Figure 6 and Figure 7 The groove size of the inner adjustment ring 038 is shown as a0*b0, and the groove size of the outer adjustment ring 138 is a1*b1.

[0091] Among them, a groove matching the groove of the inner winding tube 036 is provided on the outer wall of the lining 033 .

[0092] In which, the sealing assembly includes a first sealing ring 034 and a second sealing ring 035, the inner diameter of the first sealing ring 034 is smaller than that of the second sealing ring 035, the first sealing ring 034 is sleeved between the liner 033 and the inner winding tube 036, and the two end faces are respectively against the liner 033 and the inner winding tube 036, the outer side of the first sealing ring 034 is sealedly connected to the interior of the threaded tube 032, and the inner wall of the first sealing ring 034 is sealedly connected to the outer wall of the liner 033; the second sealing ring 035 is arranged between the first sealing ring 034 and the inner winding tube 036 fixing assembly, and the two end faces are respectively against the first sealing ring 034 and the inner winding tube 036 fixing assembly, the outer side of the second sealing ring 035 is sealedly connected to the interior of the threaded tube 032, and the inner wall of the second sealing ring 035 is sealedly connected to the outer wall of the inner winding tube 036.

[0093] The second sealing ring 035 is disposed between the inner fixing ring 037 and the first sealing ring 034 , and two end surfaces thereof abut against the inner fixing ring 037 and the first sealing ring 034 .

[0094] Example 3

[0095] The method for manufacturing the gas turbine rotor cooling flexible pipe of the present invention will be described in detail below.

[0096] The present invention also provides a method for manufacturing the above-mentioned gas turbine rotor cooling flexible pipe, comprising the following steps:

[0097] S1, firstly weld the pipe 031, the threaded pipe 032 and the lining 033 into one piece as required;

[0098] S2, sequentially install the first sealing ring 034 and the inner winding tube 036 and install them in place;

[0099] S3, insert the second sealing ring 035 and insert it into the inner fixing ring 037;

[0100] S4, install the inner adjustment ring 038, and screw the inner pressure ring 039 into the outer thread of the threaded tube 032 and tighten it. Pay attention to the torque during the tightening process. When the set value is reached, it is considered that the inner adjustment ring 038 has been squeezed into place, and the tightening action is stopped;

[0101] S5, insert the gasket 135, and weld the inner pressure ring 039, the threaded tube 032 and the gasket 135;

[0102] S6, welding the separation ring 132 and all components obtained by step S5 into one;

[0103] S7, insert the outer winding tube 136 and the outer adjustment ring 138 in sequence, and weld and fix them in place;

[0104] S9, inserting the outer pressure ring 139, and striking the outer pressure ring 139, so that the outer pressure ring 139 and the conical surface of the outer adjustment ring 138 are squeezed;

[0105] S9, welding the outer pressure ring 139 and the outer adjustment ring 138 to complete the production of the flexible section 03;

[0106] S10, welding the connecting pipe 02, the flexible section 03 manufactured in step S9 and the end flange 01 to complete the manufacture of the flexible pipe for cooling the gas turbine rotor.

[0107] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A gas turbine rotor cooling flexible pipe, characterized in that: include: A flexible section, connecting pipes arranged at both ends of the flexible section, and an end flange arranged at the end of the connecting pipe; the flexible section, the connecting pipe and the end flange are connected by welding; The flexible section includes a piping, a threaded pipe, an inner liner, an inner winding pipe fixing assembly, an outer winding pipe fixing assembly, and a sealing assembly. The piping is arranged at one end of the threaded pipe and connected to the connecting pipe. The inner liner is arranged inside the threaded pipe. An inner winding pipe is arranged between the inner liner and the threaded pipe. The sealing assembly is arranged in the gap between the inner liner, the threaded pipe, the inner winding pipe and the inner winding pipe fixing assembly for sealing. An outer winding pipe is arranged outside the inner winding pipe, a separating ring is arranged between the inner winding pipe and the outer winding pipe, the inner winding pipe fixing assembly is arranged between the inner winding pipe and the separating ring, and the outer winding pipe fixing assembly is arranged outside the outer winding pipe. Both the inner winding pipe fixing assembly and the outer winding pipe fixing assembly have a conical surface for adjusting the degree of fixing.

2. The gas turbine rotor cooling flexible pipe according to claim 1, characterized in that: The outer winding tube fixing assembly includes an outer adjustment ring and an outer pressure ring. The outer adjustment ring is sleeved on the outer wall of the outer winding tube. The outer pressure ring is sleeved on the outer wall of the outer adjustment ring from the middle part of the outer adjustment ring and extends out from the end of the outer adjustment ring away from the connecting pipe.

3. The gas turbine rotor cooling flexible pipe according to claim 2, characterized in that: The inner winding tube fixing assembly includes an inner fixing ring, an inner adjusting ring and an inner pressure ring. The inner fixing ring is sleeved between the threaded tube and the inner winding tube for fixing the inner winding tube. The inner adjusting ring is sleeved on the outer wall of the inner fixing ring away from the sealing member at one end, and the end face is abutted against the inner fixing ring. The inner pressure ring is sleeved between the separating ring and the threaded tube and wraps around the outer wall of the inner adjusting ring. The threaded tube has an external thread, and the inner pressure ring has an internal thread matching the external thread.

4. The gas turbine rotor cooling flexible pipe according to claim 3, characterized in that: The contact surfaces between the inner adjustment ring and the inner pressure ring both have conical surfaces with the same angle; the contact surfaces between the outer adjustment ring and the outer pressure ring both have conical surfaces with the same angle.

5. The gas turbine rotor cooling flexible pipe according to claim 3, characterized in that: A gasket is arranged at a gap formed after the threaded pipe and the inner pressure ring are threadedly connected.

6. The gas turbine rotor cooling flexible pipe according to claim 5, characterized in that: The conical surfaces of the inner adjustment ring and the outer adjustment ring are respectively provided with grooves of the same or different sizes and evenly distributed.

7. The gas turbine rotor cooling flexible pipe according to claim 5, characterized in that: A clamping groove matching the groove of the inner winding tube is arranged on the outer wall of the inner lining.

8. The gas turbine rotor cooling flexible pipe according to claim 5, characterized in that: The sealing assembly includes a first sealing ring and a second sealing ring. The inner diameter of the first sealing ring is smaller than that of the second sealing ring. The first sealing ring is sleeved between the liner and the inner winding tube, and its two end faces are respectively abutted against the liner and the inner winding tube. The outer side of the first sealing ring is sealedly connected to the interior of the threaded tube, and the inner wall of the first sealing ring is sealedly connected to the outer wall of the liner. The second sealing ring is arranged between the first sealing ring and the inner winding tube fixing assembly, and its two end faces are respectively abutted against the first sealing ring and the inner winding tube fixing assembly. The outer side of the second sealing ring is sealedly connected to the interior of the threaded tube, and the inner wall of the second sealing ring is sealedly connected to the outer wall of the inner winding tube.

9. The gas turbine rotor cooling flexible pipe according to claim 8, characterized in that: The second sealing ring is arranged between the inner fixing ring and the first sealing ring, and two end surfaces of the second sealing ring abut against the inner fixing ring and the first sealing ring.

10. A method for manufacturing a gas turbine rotor cooling flexible pipe according to claim 9, characterized in that: The steps include: S1, firstly weld the pipe, the threaded pipe and the liner into one piece as required; S2, sequentially install the first sealing ring and the inner winding tube and install them in place; S3, inserting the second sealing ring and inserting it into the inner fixing ring; S4, installing the inner adjustment ring, screwing the inner pressure ring into the outer thread of the threaded pipe and tightening it, paying attention to the torque during the tightening process, and when the set value is reached, it is considered that the inner adjustment ring has been squeezed into place, and the tightening action is stopped; S5, inserting the gasket, and welding the inner pressure ring, the threaded pipe and the gasket; S6, welding the separation ring and all components obtained by step S5 into one; S7, inserting the outer winding tube and the outer adjustment ring in sequence, and welding and fixing them in place; S9, inserting the outer pressure ring, and striking the outer pressure ring, so that the outer pressure ring and the conical surface of the outer adjustment ring are squeezed; S9, welding the outer pressure ring and the outer adjustment ring to complete the production of the flexible section; S10, welding the connecting pipe, the flexible section manufactured in step S9 and the end flange to complete the manufacturing of the flexible pipe for cooling the gas turbine rotor.

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