A lubricating oil supply structure for a gas turbine

Abstract

The present invention relates to the field of fuel oil supply systems for gas turbines, and particularly to a lubricating oil supply structure for a gas turbine, which includes a fixed ring, a bushing, a ring gripper, a pipe joint, a plug, and a plurality of oil pipes. The bottom of the bushing is provided with oil injection holes, and adjacent oil pipes are connected through the bushing. One end of the ring gripper is fixed to the fixed ring by partial intermittent argon arc welding, and the other end is connected to the oil pipe. A pipe joint is provided at the oil inlet of the oil pipe, and a plug is provided at the tail end of the oil pipe. The present invention changes the vacuum brazing to argon arc welding, which reduces the influence of temperature on the hardness of the oil pipe, reduces the vibration stress, changes the structure and reduces the weight of the pipe plug, reduces the amplitude of the oil pipe, separates the positions of the fixed ring and the bushing, realizes the distinction between the oil injection function and the fixing function, and improves the reliability of the lubricating oil supply structure.

Description

Technical Field

[0001] The present invention relates to the field of fuel supply systems for gas turbines, and particularly to a lubricating fuel supply structure for a gas turbine. Background Art

[0002] The lubrication system of a gas turbine ensures the safe operation of bearings under high-speed rotation, and a reliable lubricating oil supply structure is required to lubricate the bearings. The main lubricating oil supply pipe is composed of a pipe body, a pipe plug, a pipe, and a ring. The annular part is installed parallel and in contact with the bearing. The oil supply pipe is fixedly connected at three evenly distributed positions by pipe joints, and three holes are opened at the connection points to lubricate the bearing at the tested angle. The oil pipe is connected by type I vacuum brazing, the pipe plug is welded to the end of the oil pipe by flame brazing, and the outer shape of the oil pipe is manufactured and controlled by bending the on-site sampled pipe to meet the assembly requirements of the ring. However, the hardness of the pipe body decreases after flame brazing, which easily causes the oil pipe to break down. Summary of the Invention

[0003] Aiming at the problems existing in the prior art, the present invention provides a lubricating fuel supply structure for a gas turbine to ensure the smooth completion of the lubricating fuel supply system.

[0004] The present invention is realized through the following technical solutions:

[0005] A lubricating fuel supply structure for a gas turbine, comprising a fixing ring, a bushing, a ring gripper, a pipe joint, a plug, and a plurality of oil pipes. The bottom of the bushing is provided with an oil injection hole, and adjacent oil pipes are connected through the bushing. One end of the ring gripper is fixedly connected to the fixing ring, and the other end is connected to the oil pipe by a partial intermittent argon arc welding method. A pipe joint is provided at the oil inlet of the oil pipe, and a plug is provided at the tail end of the oil pipe.

[0006] Preferably, there are at least three ring grippers.

[0007] Preferably, a plurality of ring grippers are evenly arranged between the oil pipe and the fixing ring.

[0008] Preferably, both ends of the ring gripper are welded to the fixing ring, and the length of the welding position during welding is 1 / 4 to 1 / 3 of the length of the ring gripper.

[0009] Preferably, the number of bushings is the same as the number of ring grippers.

[0010] Preferably, a safety distance is reserved between the ring gripper and the bushing, and the safety distance is 3 to 5 cm.

[0011] Preferably, the angle between the central axis of the oil injection hole and the axis of the longitudinal section of the oil pipe is 5° to 10°.

[0012] Preferably, the bushing and the oil pipe are fixed by argon arc welding.

[0013] Preferably, a clamping groove is provided on the loop clamp, and both ends of the inner wall of the clamping groove are welded to the oil pipe by a partial intermittent argon arc welding method, and the welding length during welding is 5 mm.

[0014] Preferably, the pipe plug adopts an embedded structure and is fixedly connected to the oil pipe by argon arc welding.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] An improved lubricating oil supply structure of a gas turbine in the present invention reduces the vibration stress. Changing the vacuum brazing to argon arc welding reduces the influence of temperature on the hardness of the oil pipe. The structural change and weight reduction of the pipe plug reduce the amplitude of the oil pipe. The positions of the fixed ring and the bushing are separated, realizing the distinction between the oil injection function and the fixing function, and improving the reliability of the lubricating oil supply structure.

[0017] In the present invention, the welding process is optimized. The original structure is vacuum brazing and full welding, and after improvement, it is argon arc welding and partial intermittent welding, and two changes are made in the intermittent welding; at the same time, the outer wall of the oil pipe and the clamping groove are also fixed by partial intermittent welding.

[0018] The present invention adopts a pipe plug with an embedded structure and argon arc welding. The embedded structure can reduce the heat affected zone and is beneficial for subsequent welding. At the same time, the quality of the pipe plug with the embedded structure is smaller than that of the outer-wrapped pipe plug (the weight of the pipe plug in the original structure is 0.006 kg, and the weight of the improved pipe plug is 0.001 kg), which changes the center of mass and can play a certain role in reducing the amplitude. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of a lubricating oil supply structure of a gas turbine according to the present invention;

[0020] Figure 2 is a partial schematic diagram of a lubricating oil supply structure of a gas turbine according to the present invention;

[0021] Figure 3 is a full-welded structure of an existing lubricating oil supply structure of a gas turbine;

[0022] Figure 4 is a schematic diagram of a partial intermittent argon arc welding of the loop clamp and the oil pipe in a lubricating oil supply structure of a gas turbine according to the present invention;

[0023] Figure 5 is a schematic diagram of the position of the bushing in a lubricating oil supply structure of a gas turbine according to the present invention;

[0024] Figure 6 is a schematic diagram of an outer-wrapped pipe plug structure in the existing structure;

[0025] Figure 7Schematic diagram of an embedded pipe plug structure in a lubricating oil supply structure of a gas turbine according to the present invention.

[0026] In the figure, 1 is a fixing ring; 2 is a bushing; 3 is a ring gripper; 4 is a pipe joint; 5 is a welding position; 6 is a pipe plug; 7 is an oil pipe. Specific embodiments

[0027] The following further elaborates on the present invention with specific embodiments, which is an explanation rather than a limitation of the present invention.

[0028] The present invention discloses a lubricating oil supply structure for a gas turbine. Referring to Figure 1 、 2 , a lubricating oil supply structure for a gas turbine includes a fixing ring 1, a bushing 2, a ring gripper 3, a pipe joint 4, a plug, and a plurality of oil pipes 7. Adjacent oil pipes 7 are connected through a bushing 2, and the bushing 2 and the oil pipe 7 are fixed by argon arc welding. The original structure was vacuum brazing and full welding (such as Figure 3 ), and after improvement, it is argon arc welding and local intermittent welding (such as Figure 4 ).

[0029] Referring to Figure 4 , one end of the ring gripper 3 is fixedly connected to the fixing ring 1, and the other end is connected to the oil pipe 7 by local intermittent argon arc welding. That is, the ring gripper 3 is provided with a clamping groove, and both ends of the inner wall of the clamping groove are welded to the oil pipe 7 by local intermittent argon arc welding, and the welding length during welding is 5 mm.

[0030] There are at least three ring grippers 3, and a plurality of ring grippers 3 are evenly arranged between the oil pipe 7 and the fixing ring 1. Both ends of the ring gripper 3 are welded to the fixing ring 1, and the length of the welding position 5 during welding is 1 / 4 to 1 / 3 of the length of the ring gripper 3.

[0031] Referring to Figure 5 , the number of bushings 2 is the same as the number of ring grippers 3. A safety distance is reserved between the ring gripper 3 and the bushing 2, and the safety distance is 3 to 5 cm.

[0032] Referring to Figure 2 , an oil injection hole is provided at the bottom of the bushing 2, and the central axis of the oil injection hole forms an angle of 5° to 10° with the axis of the longitudinal section of the oil pipe 7. The outer shape of the oil pipe 7 is manufactured and controlled by bending the on-site sample to meet the assembly requirements of the ring. The lubricating oil is sprayed from the bottom of the bushing 2 towards the bearing, and the bearing is evenly lubricated, and the spraying angle is determined by experiments.

[0033] A pipe joint 4 is provided at the oil inlet of the oil pipe 7. The lubricating oil enters the oil supply structure from the pipe joint 4 and flows around the oil pipe 7 for one week and then flows to the tail end of the oil pipe 7.

[0034] A plug is provided at the tail end of the oil pipe 7, and the pipe plug 6 adopts an embedded structure (such asFigure 7 ), and is fixedly connected to the oil pipe 7 by argon arc welding. The structure of the pipe plug 6 is changed from an outer wrapping type (such as Figure 6 ) to an embedded type, reducing the heat affected zone and being beneficial to welding.

[0035] During installation, the lubricating oil supply structure proposed by the present invention is installed in parallel and in contact with the bearing for lubricating the power turbine bearing. Vibration calculation is carried out on the improved lubricating oil supply main pipe. From the results, it can be seen that the frequencies of the 1st to 20th orders of the improved lubricating oil supply main pipe are 425.71 Hz to 4532.8 Hz. In the relative vibration stress distribution of the 1st to 20th orders, the maximum vibration stress is distributed in the welding area between the lubricating oil supply main pipe and the support ring, which is the same as the position of the maximum vibration stress before improvement. Through about 2000 hours of test verification, the gas turbine operates safely and the oil pipe 7 does not have a fracture failure.

[0036] The improvement of the lubricating oil supply structure of the present invention reduces the vibration stress. Changing the vacuum brazing to argon arc welding reduces the influence of temperature on the hardness of the oil pipe. The structural change and weight reduction of the pipe plug 6 reduce the amplitude of the oil pipe. The positions of the fixing ring 1 and the bushing 2 are separated, realizing the distinction between the oil injection function and the fixing function, and improving the reliability of the lubricating oil supply structure.

[0037] The above are only the preferred embodiments of the present invention and are not used to limit the technical solutions of the present invention. Those skilled in the art should understand that without departing from the spirit and principle of the present invention, the technical solutions can be modified and replaced simply in several aspects, and these modifications and replacements also fall within the protection scope covered by the claims.

Claims

1. A lubricating oil supply structure for a gas turbine, characterized in that, It includes a fixed ring (1), a bushing (2), a ring gripper (3), a pipe joint (4), a plug, and multiple oil pipes (7). The bottom of the bushing (2) is provided with oil injection holes. Adjacent oil pipes (7) are connected through the bushing (2). One end of the ring gripper (3) is fixedly connected to the fixed ring (1), and the other end is connected to the oil pipe (7) by a partial intermittent argon arc welding method. A pipe joint (4) is provided at the oil inlet of the oil pipe (7), and a plug is provided at the tail end of the oil pipe (7); Both ends of the ring gripper (3) are welded to the fixed ring (1). The length of the welding position (5) during welding is 1 / 4 to 1 / 3 of the length of the ring gripper (3); The angle between the central axis of the oil injection hole and the axis of the longitudinal section of the oil pipe (7) is 5° to 10°; The ring gripper (3) is provided with a clamping groove. Both ends of the inner wall of the clamping groove are welded to the oil pipe (7) by a partial intermittent argon arc welding method. The welding length during welding is 5 mm.

2. The gas turbine lubricating oil supply structure according to claim 1, wherein, There are at least three ring grippers (3).

3. The gas turbine lubricating oil supply structure according to claim 2, characterized in that, Multiple ring grippers (3) are evenly arranged between the oil pipe (7) and the fixed ring (1).

4. The gas turbine lubricating oil supply structure according to claim 1, wherein The number of bushings (2) is the same as the number of ring grippers (3).

5. The lubricating oil supply structure of the gas turbine according to claim 1, characterized in that, A safety distance is reserved between the ring gripper (3) and the bushing (2), and the safety distance is 3 to 5 cm.

6. The lubricating oil supply structure of the gas turbine according to claim 1, wherein The bushing (2) and the oil pipe (7) are fixed by argon arc welding method.

7. The gas turbine lubricating oil supply structure according to claim 1, characterized in that, The pipe plug (6) adopts an embedded structure and is fixedly connected to the oil pipe (7) by argon arc welding method.

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