A rotating driving device for bulb tubular turbine unit

Abstract

The application provides a bulb tubular turbine unit rotary drive device, and belongs to the technical field of hydroelectric generators. The bulb tubular turbine unit rotary drive device is arranged in a bulb body. An operating oil pipe, a rotor maintenance platform and a unit rotor are further arranged in the bulb body. The overrunning coupling, the ring gear, the ring driving arm and the rotor maintenance platform are coaxially arranged with the shaft of the unit rotor. The output torque of the speed reduction mechanism after energization and starting makes the ring driving arm rotate coaxially around the ring gear. The ring driving arm drives the overrunning coupling to rotate through the driving key, and drives the unit rotor and the operating oil pipe to rotate through the overrunning coupling. The application is convenient to assemble, quick to disassemble, balanced in rotation speed, objective and accurate in measured data, overcomes repeated ineffective labor, liberates labor, optimizes the working environment and meets the requirements of high-quality development.

Description

Technical Field

[0001] This invention relates to the field of hydro-generator technology, and in particular to a rotating drive device for a bulb-type turbine generator. Background Technology

[0002] The development of bulb turbine generator sets began in 1892 and has a history of over a century. A key feature of this type of generator is that the water flow passes directly through the bulb, making it suitable for hydraulic conditions with low head and high flow rates. Since the 1980s, bulb turbine generator sets have become increasingly popular in my country. However, the entire shaft adjustment process is confined within the metal bulb housing and relies on manual rotor operation, resulting in an unfavorable working environment and low efficiency.

[0003] The generator section of a bulb-type hydro-turbine generator set is installed within a bulb-shaped metal casing, with the generator's main shaft centerline parallel to the ground plane. The limited space within the bulb casing restricts the number of personnel that can be accommodated and limits the types of drive equipment that can be used. Furthermore, uneven force application causes numerous axial and radial interferences in the rotor, resulting in severely distorted data, frequent repetitive and ineffective work, arduous labor for personnel, lost power generation time, and severely hindering high-quality shaft system adjustments. Therefore, developing a highly efficient and convenient rotary drive device within the bulb casing to replace manual labor is an urgent priority for overcoming industry technical bottlenecks and achieving intelligent operation and maintenance. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of the invention is to provide a solution to at least one technical problem raised in the background art.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a bulb-type turbine rotation drive device, including an intermediate coupling, a bracket, a ring gear, a ring drive arm and a reduction mechanism;

[0006] The bulb-type turbine rotation drive is housed inside the bulb body; the bulb body also houses an operating oil pipe, a rotor maintenance platform, and a turbine rotor; the outer periphery of the rotor maintenance platform is fixedly connected to the bottom of the bulb body, and the top of the turbine rotor is exposed through the central through hole of the rotor maintenance platform; the operating oil pipe is coaxially arranged with the turbine rotor and extends from the top of the turbine rotor.

[0007] The transition coupling, ring gear, ring drive arm, and rotor maintenance platform are coaxially arranged with the shaft of the unit rotor.

[0008] The bottom end of the bracket is fixed to the surface of the rotor maintenance platform, and the top end is fixedly connected to the bottom end of the ring gear.

[0009] The over coupling is sleeved on the periphery of the operating oil pipe, and the bottom is fixedly connected with the top end of the rotor of the unit;

[0010] The bottom surface of the ring-shaped driving arm is movably connected with the top surface of the ring-shaped gear, and the inner diameter of the ring-shaped driving arm is nested with the outer diameter of the over coupling and is drivingly connected through the driving groove.

[0011] The speed reduction mechanism is fixedly arranged at one end of the ring-shaped driving arm and is in gear meshing with the ring-shaped gear.

[0012] After the speed reduction mechanism is started by power supply, the output torque makes the ring-shaped driving arm rotate coaxially around the ring-shaped gear, the ring-shaped driving arm drives the over coupling to rotate through the driving key, and the over coupling drives the rotor of the unit and the operating oil pipe to rotate.

[0013] Further, the operating oil pipe support flange is further included.

[0014] The over coupling is sleeved on the periphery of the operating oil pipe support flange, and the bottom is fixedly connected with the top of the base of the operating oil pipe support flange; the operating oil pipe support flange is sleeved on the periphery of the operating oil pipe, and the bottom of the base of the operating oil pipe support flange is fixedly connected with the top end of the rotor of the unit.

[0015] The operating oil pipe support flange, the over coupling, the ring-shaped gear, the ring-shaped driving arm, and the rotor maintenance platform are coaxially arranged with the shaft center of the rotor of the unit.

[0016] The over coupling drives the rotor of the unit and the operating oil pipe to rotate through the operating oil pipe support flange.

[0017] Further, the speed reduction mechanism is provided with a speed reduction mechanism output shaft and a motor; the motor is connected with a start-stop controller, the start-stop controller is connected with a power supply; the motor is used for driving the speed reduction mechanism output shaft to rotate; a pinion is fixedly installed on the power output end of the speed reduction mechanism output shaft, and the pinion is in gear meshing with the ring-shaped gear.

[0018] Further, the bottom surface of the ring-shaped driving arm is provided with a boss, and the side wall of the boss is embedded in the inner wall of the ring-shaped gear.

[0019] Optionally, the driving key is fixedly arranged on the inner wall of the ring-shaped driving arm, and the over coupling is provided with a driving groove on the outer wall; when the ring-shaped driving arm rotates, the driving key drives the over coupling to rotate through the gap cooperation with the driving groove.

[0020] Optionally, the driving key is fixedly arranged on the outer wall of the overrunning coupling, and a driving groove is arranged on the inner wall of the annular driving arm; when the annular driving arm rotates, the driving groove and the driving key are matched through a gap to drive the overrunning coupling to rotate.

[0021] Further, the bottom locking plate is arranged coaxially with the shaft of the rotor, and a part of the top surface of the bottom locking plate is fixedly connected with the bottom surface of the boss.

[0022] Further, a part of the top surface of the bottom locking plate is movably arranged below the bottom surface of the annular gear.

[0023] Further, the speed reduction mechanism is arranged in two groups and is fixedly arranged at the two ends of the annular driving arm and is meshed with the annular gear through gears; the driving groove and the driving key are arranged in two groups and are symmetrically arranged on the two sides of the shaft of the rotor.

[0024] Further, a rotation gap is arranged between the overrunning coupling and the operating oil pipe support flange.

[0025] The beneficial effects of the present application are as follows: 1. The present application adopts automatic driving instead of manual driving, solves the problems of uneven force, unstable speed, pause or axial / radial interference during traditional manual driving, reduces the possibility of periodic error or false deviation of the above data measurement (such as runout, gap), and ultimately affects the adjustment accuracy of the shaft system. By automatically driving the rotor at a constant speed, human interference is eliminated, ensuring that the measurement data truly reflects the mechanical state, reducing repeated adjustments and downtime, providing stable and reliable rotation conditions for mechanical centering, gap measurement and vibration analysis, thereby ensuring the assembly precision of the unit.

[0026] 2. The components of the present application are simple to assemble and convenient to disassemble: each component can be quickly disassembled without the need for complex tools; the overall size of the device is optimized, and it can easily pass through the manhole door of the unit without the need for additional expansion of the opening or disassembly of large structures; the device can be assembled and put into debugging within 1-2 hours, and can be quickly disassembled and removed after maintenance is completed, reducing the downtime of the unit and avoiding the 3-5 day delay caused by repeated trial and error in the traditional way. While efficiently replacing manual labor, it reduces repeated ineffective labor: eliminates the high-risk operation of manually pushing a dozen tons of rotors, improves the working environment, and meets the requirements of safe and civilized construction. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

[0028] Figure 1 A perspective view of the output assembly of the present application;

[0029] Figure 2 A cross-sectional view of the overall structure of the present application;

[0030] Figure 3 A cross-sectional view of the output assembly of the present application.

[0031] Reference numerals:

[0032] 1. bulb body; 2. operating oil pipe; 3. operating oil pipe support flange; 4. over coupling; 5. rotor maintenance platform; 6. unit rotor; 7. speed reduction mechanism; 8. speed reduction mechanism output shaft; 9. pinion; 10. ring gear; 11. ring driving arm; 12. driving key; 13. driving slot; 14. bottom locking plate; 15. support; 16. rotation gap; 17. boss. DETAILED DESCRIPTION

[0033] In order to make personnel in the art better understand the technical solutions in the embodiments of the present application, the technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. It should be understood that these descriptions are only exemplary, and are not intended to limit the scope of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor should fall within the scope of protection of the present application.

[0034] In addition, in the following description, the description of well-known structures and techniques is omitted to avoid unnecessary confusion of the concepts disclosed in the present application.

[0035] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance. The terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] The exemplary embodiments will be described in detail herein, with examples shown in the drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Rather, they are merely examples of methods and systems consistent with some aspects of the present application as detailed in the appended claims.

[0037] As Figures 1-3 shown, a bulb through-flow unit rotary drive device includes an over coupling 4, a support 15, a ring gear 10, a ring driving arm 11 and a speed reduction mechanism 7;

[0038] The bulb through-flow unit rotary drive device is arranged in a bulb body 1; an operating oil pipe 2, a rotor maintenance platform 5 and a unit rotor 6 are also arranged in the bulb body 1; the outer periphery of the rotor maintenance platform 5 is fixedly connected with the bottom end of the bulb body 1, and the top end of the unit rotor 6 is exposed through the central through hole of the rotor maintenance platform 5; the operating oil pipe 2 is coaxially arranged with the unit rotor 6 and extends out from the top end of the unit rotor 6;

[0039] The over coupling 4, the ring gear 10, the ring driving arm 11 and the rotor maintenance platform 5 are coaxially arranged with the shaft center of the unit rotor 6;

[0040] The bottom end of the support 15 is fixed to the plate surface of the rotor maintenance platform 5, and the top end is fixedly connected with the bottom end of the ring gear 10;

[0041] The over coupling 4 is sleeved on the periphery of the operating oil pipe 2, and the bottom is fixedly connected with the top end of the unit rotor 6;

[0042] The bottom surface of the annular driving arm 11 is movably connected with the top surface of the annular gear 10, and the inner diameter of the annular driving arm 11 is nested with the outer diameter of the overrunning coupling 4 and is drivingly connected through the driving slot 13.

[0043] The reduction mechanism 7 is fixedly arranged at one end of the annular driving arm 11 and is in gear meshing with the annular gear 10.

[0044] After the reduction mechanism 7 is powered on, the output torque makes the annular driving arm 11 rotate coaxially around the annular gear 10, the annular driving arm 11 drives the overrunning coupling 4 to rotate through the driving key 12, and the overrunning coupling 4 drives the unit rotor 6 and the operating oil pipe 2 to rotate.

[0045] Further, the operating oil pipe support flange 3 is further included.

[0046] The overrunning coupling 4 is arranged around the operating oil pipe support flange 3, and the bottom is fixedly connected with the top of the base of the operating oil pipe support flange 3; the operating oil pipe support flange 3 is arranged around the operating oil pipe 2, and the base bottom of the operating oil pipe support flange 3 is fixedly connected with the top end of the unit rotor 6.

[0047] The operating oil pipe support flange 3, the overrunning coupling 4, the annular gear 10, the annular driving arm 11, and the rotor maintenance platform 5 are arranged coaxially with the shaft center of the unit rotor 6.

[0048] The overrunning coupling 4 drives the unit rotor 6 and the operating oil pipe 2 to rotate through the operating oil pipe support flange 3.

[0049] Further, the reduction mechanism 7 is provided with a reduction mechanism output shaft 8 and a motor; the motor is connected with a start-stop controller, and the start-stop controller is connected with a power supply; the motor is used to drive the reduction mechanism output shaft 8 to rotate; a pinion 9 is fixedly installed at the power output end of the reduction mechanism output shaft 8, and the pinion 9 is in gear meshing with the annular gear 10.

[0050] Further, the bottom surface of the annular driving arm 11 is provided with a boss 17, and the side wall of the boss 17 is embedded in the inner wall of the annular gear 10.

[0051] In one embodiment, as shown in Figure 1 The driving key 12 is fixedly arranged on the inner wall of the annular driving arm 11, and the driving slot 13 is arranged on the outer wall of the overrunning coupling 4; when the annular driving arm 11 rotates, the driving key 12 drives the overrunning coupling 4 to rotate through the gap cooperation with the driving slot 13.

[0052] In another embodiment, the driving key 12 is fixedly arranged on the outer wall of the over coupling 4, and a driving groove 13 is arranged on the inner wall of the annular driving arm 11; when the annular driving arm 11 rotates, the driving groove 13 cooperates with the driving key 12 through a gap to drive the over coupling 4 to rotate.

[0053] When the device needs to be overhauled, the components of the device are transported into the bulb body through the inlet and outlet arranged on the sidewall of the bulb body, and after assembly is completed, the motor arranged in the speed reduction mechanism 7 is started through the start-stop controller, the motor drives the power output end of the output shaft 8 of the speed reduction mechanism, and the coaxially rotating small gear 9 is driven to rotate at the same speed; due to the fixation of the support 15, the movement of the annular gear 10 is limited, and the rotation movement generated by the speed reduction mechanism output shaft 8 driving the small gear 9 is converted into the revolution movement of the small gear 9 around the annular gear 10 through the meshing of the small gear 9 and the annular gear 10; when the speed reduction mechanism 7 revolves around the small gear 9 and the annular gear 10, the annular driving arm 11 fixedly connected therewith rotates; the driving key 12 (or the driving groove 13) connected with the inner diameter of the annular driving arm 11 pushes the corresponding driving groove 13 (or the driving key 12) on the transition coupling, and transmits the torque to the operating oil pipe 2 and the unit rotor 6, so as to drive the operating oil pipe 2 and the unit rotor 6 to rotate synchronously; the gap cooperation of the driving key 12 and the driving groove 13 absorbs the installation deviation, ensures that the power is stably transmitted, and finally drives the rotor to rotate at a set speed, thereby completing the shafting adjustment.

[0054] When the large rotating unit is running, the operating oil pipe 2 is prone to vibration when high-pressure fluid flows or the device is running, and direct contact friction between the over coupling 4 directly sleeved on the periphery of the operating oil pipe 2 will cause fatigue damage of the operating oil pipe 2 and reduce the service life of the component; therefore, the operating oil pipe support flange 3 is preferably arranged between the over coupling 4 and the operating oil pipe 2, the driving key 12 (or the driving groove 13) connected with the inner diameter of the annular gear 10 pushes the corresponding driving groove 13 (or the driving key 12) on the transition coupling 4, and the torque is first transmitted to the operating oil pipe support flange 3, and then transmitted to the operating oil pipe 2 and the unit rotor 6, so as to drive them to rotate synchronously. By fixing or limiting the radial displacement of the oil pipe, the vibration amplitude is reduced; at the same time, the direct contact friction between the oil pipe and the peripheral structure is reduced, and the service life of the oil pipe is prolonged.

[0055] Further, the bottom locking plate 14 is coaxially arranged with the shaft of the unit rotor 6, and a part of the top surface of the bottom locking plate 14 is fixedly connected with the bottom surface of the boss 17.

[0056] Further, a part of the top surface of the bottom locking plate 14 is movably arranged below the bottom surface of the annular gear 10.

[0057] Please refer to Figure 3When the ring-shaped driving arm 11 rotates, it is easy to be separated from the ring-shaped gear 10 due to the influence of centrifugal force, etc. The bottom locking plate 14 fixes the ring-shaped driving arm 11 and the inner diameter of the ring-shaped gear 10 axially by mechanical constraints such as threaded fastening, buckle locking, to avoid the ring-shaped driving arm 11 from being separated from the ring-shaped gear 10 due to centrifugal force, vibration or torque recoil, resulting in interruption of operation or damage to parts.

[0058] Further, the speed reduction mechanism 7 is provided with two groups, which are respectively fixedly arranged at the two ends of the ring-shaped driving arm 11 and are in gear engagement with the ring-shaped gear 10; the driving grooves 13 and the driving keys 12 are provided with two groups, which are symmetrically arranged on both sides of the shaft center of the unit rotor 6.

[0059] As shown in Figure 1 and Figure 3 , the design that the speed reduction mechanism 7 is provided with two groups and is fixedly arranged at the two ends of the ring-shaped driving arm 11 can better maintain the balance and stability of torque transmission: the two groups of speed reduction mechanisms 7 are simultaneously driven, which can avoid the unbalanced load caused by unilateral transmission and ensure that the torque is uniformly transmitted to the overrunning coupling 4 and the operating tubing support flange 3, thereby reducing vibration and gear wear; when the ring-shaped gear 10 is engaged on both sides, the radial forces of the pinions 9 on the gear rings cancel each other out, thereby reducing the risk of stress deformation of the support structure; and when one group of speed reduction mechanisms 7 fails, the other group can still maintain partial driving capability, thereby avoiding complete shutdown of the unit.

[0060] Further, the overrunning coupling 4 and the operating tubing support flange 3 are provided with a rotation gap 16 therebetween.

[0061] Please continue to refer to Figure 1 and Figure 3 , the overrunning coupling 4 and the operating tubing support flange 3 are preferably provided with a rotation gap 16 therebetween, when the overrunning coupling 4 rotates, only the bottom of the overrunning coupling 4 is connected to the top of the base of the operating tubing support flange 3 to drive the operating tubing support flange 3 to rotate, thereby preventing the rotation friction between the overrunning coupling 4 and the operating tubing support flange 3, causing damage to the parts and prolonging the service life of the equipment; at the same time, during the operation of the large rotating unit, the operating tubing support flange 3 and the overrunning coupling 4 may be misaligned due to thermal deformation, installation error or load change, and the rotation gap 16 allows the overrunning coupling 4 to adaptively adjust within a limited range, thereby avoiding additional stress or bearing wear caused by poor alignment.

[0062] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, but not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application. Any changes or replacements that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered within the protection scope of the present application.

Claims

1. A rotating drive device for a bulb-type turbine generator set, characterized in that: It includes an intermediate coupling (4), a bracket (15), a ring gear (10), a ring drive arm (11), and a reduction mechanism (7); The bulb-type turbine rotation drive device is installed inside the bulb body (1); the bulb body (1) is also equipped with an operating oil pipe (2), a rotor maintenance platform (5) and a turbine rotor (6); the outer periphery of the rotor maintenance platform (5) is fixedly connected to the bottom end of the bulb body (1), and the top end of the turbine rotor (6) is exposed through the central through hole of the rotor maintenance platform (5); the operating oil pipe (2) is coaxially arranged with the turbine rotor (6) and extends from the top end of the turbine rotor (6); The transition coupling (4), ring gear (10), ring drive arm (11) and rotor maintenance platform (5) are coaxially arranged with the shaft of the unit rotor (6); The bottom end of the bracket (15) is fixed to the plate surface of the rotor maintenance platform (5), and the top end is fixedly connected to the bottom end of the ring gear (10). The transition coupling (4) is sleeved around the operating oil pipe (2), and its bottom is fixedly connected to the top of the unit rotor (6); The bottom surface of the annular drive arm (11) is movably connected to the top surface of the annular gear (10), and the inner diameter of the annular drive arm (11) is nested with the outer diameter of the transition coupling (4) and is connected by transmission through the drive groove (13). The deceleration mechanism (7) is fixedly disposed at one end of the annular drive arm (11) and meshes with the annular gear (10) through gear meshing; After the deceleration mechanism (7) is powered on, it outputs torque, causing the annular drive arm (11) to rotate coaxially around the annular gear (10). The annular drive arm (11) drives the transition coupling (4) to rotate through the drive key (12), and drives the unit rotor (6) and the operating oil pipe (2) to rotate through the transition coupling (4).

2. The bulb-type turbine rotation drive device according to claim 1, characterized in that, Also includes: Operating oil pipe support flange (3); The transition coupling (4) is sleeved around the operating oil pipe support flange (3), and its bottom is fixedly connected to the top of the base of the operating oil pipe support flange (3); the operating oil pipe support flange (3) is sleeved around the operating oil pipe (2), and the bottom of the base of the operating oil pipe support flange (3) is fixedly connected to the top of the unit rotor (6). The operating oil pipe support flange (3), transition coupling (4), ring gear (10), ring drive arm (11), and rotor maintenance platform (5) are coaxially arranged with the rotor (6) of the unit. The transition coupling (4) drives the unit rotor (6) and the operating oil pipe (2) to rotate through the operating oil pipe support flange (3).

3. The bulb-type turbine rotation drive device according to claim 2, characterized in that: The deceleration mechanism (7) is provided with a deceleration mechanism output shaft (8) and a motor; the motor is connected to a start-stop controller, and the start-stop controller is connected to a power supply; the motor is used to drive the deceleration mechanism output shaft (8) to rotate; a small gear (9) is fixedly installed at the power output end of the deceleration mechanism output shaft (8), and the small gear (9) meshes with the ring gear (10) through gear meshing.

4. The bulb-type turbine rotation drive device according to claim 3, characterized in that: The bottom surface of the annular drive arm (11) is provided with a boss (17), and the side wall of the boss (17) is embedded in the inner wall of the annular gear (10).

5. The bulb-type turbine rotation drive device according to claim 4, characterized in that: The drive key (12) is fixedly disposed on the inner wall of the annular drive arm (11), and the drive groove (13) is disposed on the outer wall of the transition coupling (4); when the annular drive arm (11) rotates, the drive key (12) and the drive groove (13) drive the transition coupling (4) to rotate through clearance fit.

6. The bulb-type turbine rotation drive device according to claim 4, characterized in that: The drive key (12) is fixedly disposed on the outer wall of the transition coupling (4), and a drive groove (13) is provided on the inner wall of the annular drive arm (11); when the annular drive arm (11) rotates, the drive groove (13) and the drive key (12) drive the transition coupling (4) to rotate through clearance fit.

7. A bulb-type turbine rotation drive device according to claim 5 or 6, characterized in that: It also includes a bottom locking plate (14); the bottom locking plate (14) is coaxially arranged with the axis of the unit rotor (6), and a part of the top surface of the bottom locking plate (14) is fixedly connected to the bottom surface of the boss (17).

8. The bulb-type turbine rotation drive device according to claim 7, characterized in that: A portion of the top surface of the bottom locking plate (14) is movably disposed below the bottom surface of the ring gear (10).

9. The bulb-type turbine rotation drive device according to claim 8, characterized in that: The deceleration mechanism (7) is provided in two sets, which are respectively inserted and fixed at both ends of the annular drive arm (11) and mesh with the annular gear (10) through gears; the drive groove (13) and drive key (12) are provided in two sets, which are symmetrically arranged on both sides of the shaft of the unit rotor (6).

10. A bulb-type turbine generator rotary drive device according to claim 9, characterized in that: A rotational clearance (16) is provided between the transition coupling (4) and the operating oil pipe support flange (3).

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