A thermal barrier coating application device for a turbine working blade

Abstract

The present invention discloses a thermal barrier coating application device for a turbine working blade, which includes a main shaft, an external gear ring, a positioning seat and a limiting rod. The main shaft is partially a welded assembly. The left end shaft is connected to the main shaft of the equipment, receiving the power and motion of the main shaft, so that the whole device keeps synchronous revolution with the main shaft of the equipment. Seven gear support rods are installed on the right end disk of the main shaft. One of the support rods is welded to the disk integrally and has a hole in the middle, into which a thermocouple is inserted into the inner cavity of the blade body to monitor the temperature of the blade. Two sets of deep groove ball bearings are installed between the other six gear support rods and the disk to ensure that each gear support rod can revolve with the main shaft and can also rotate by itself. This technical solution realizes the stable and controllable revolution and rotation of the turbine working blade, and simultaneously monitors the heating temperature of the blade in real time, ensuring the consistency and stability of the coating application quality.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal barrier coating application devices, and particularly to a thermal barrier coating application device for turbine working blades. Background Art

[0002] The service environment of the turbine working blades of aeroengines is harsh, and a thermal barrier coating needs to be applied to its surface to meet the requirements of high reliability and long service life. The thermal barrier coatings (TBCs) generally consist of a metallic bond coat with good oxidation and corrosion resistance (PtAl or MCrAlY, M = Ni, Co or Ni+Co) and a ceramic top coat with low thermal conductivity (Y2O3 partially stabilized ZrO2, YSZ). It is widely used in the hot-end components of aeroengines, enabling superalloys to withstand higher service temperatures, increasing the inlet gas temperature before the turbine, and at the same time significantly improving the engine life and reliability, reducing fuel consumption, and remarkably improving the power performance.

[0003] The preparation of YSZ coatings mainly uses two processes: atmospheric plasma spraying (APS) and electron beam physical vapor deposition (EB-PVD). The thermal barrier coatings prepared by the EB-PVD process have a typical columnar crystal structure, with high strain tolerance and erosion resistance, representing the development direction of high-performance thermal barrier coatings for turbine working blades of aeroengines. The blade heating temperature is a key parameter of the EB-PVD process, which determines the microstructure and properties of the thermal barrier coatings.

[0004] In order to obtain long-life and high-reliability thermal barrier coatings on the surfaces of turbine working blades with complex profiles, ALD and Von Ardenne companies in Germany adopt a multi-degree-of-freedom motion mode to achieve the revolution, rotation, and ±45° swing of the blades. However, to achieve this motion mode, a complex transmission mechanism is required, and components such as gears and worms of the transmission parts work at a high temperature of nearly 1000°C, and the transmission parts are extremely easy to be damaged, with high working costs. The EB-PVD equipment produced by the Paton Welding Institute in Ukraine is only equipped with one main shaft, and the revolution and rotation of the blade can be achieved through a sleeve-type fixture and its own weight, but the rotation speed is uncontrollable and jamming is likely to occur. The EB-PVD equipment developed by Beihang University can achieve the revolution and rotation of the blade through the rotation of a double main shaft, but this device is not applicable to a single-main-shaft equipment and cannot monitor the blade heating temperature in real time. Summary of the Invention

[0005] To solve the above technical problems, a thermal barrier coating application device for turbine working blades is proposed, and the specific technical solutions are as follows:

[0006] A thermal barrier coating application device for turbine working blades, characterized in that it includes a main shaft, an external gear ring, a positioning seat, and a limiting rod;

[0007] The main shaft is a welded assembly, consisting of a rotating shaft and a disc;

[0008] On the disc on one side of the main shaft, the positions of seven bushings a are evenly distributed by welding. Six bushings a are set, and two deep groove ball bearings a are arranged in each bushing a. A fixed shaft is welded on the other side of the disc at the relative position of the other bushing a;

[0009] A hole is provided in the middle position of the rotating shaft, and grooves are provided on the side walls of the rotating shaft on both sides of the hole, and the hole communicates with the grooves;

[0010] The gear support rod includes a bushing b, a bushing c, a deep groove ball bearing b, a support rod and a planetary gear; [[ID=ll]]

[0011] The bushing b and the bushing c are arranged between the two deep groove ball bearings b. The bushing b is arranged on the outer layer of the bushing c, and the support rod is inserted into the bushing b; An end cover is arranged on the end face of the bushing;

[0012] One end of the support rod is provided with a mounting port, the outer wall of the mounting port is provided with a pin hole, the other end is provided with a keyway and a ring groove, the planetary gear is keyed in the keyway of the support rod, the ring groove is arranged on the left side of the keyway, and a snap ring is arranged in the ring groove for limiting the axial movement of the planetary gear to the left;

[0013] The positioning seat consists of a positioning base and a cover;

[0014] The positioning base is composed of a shaft, a seat body, an end face baffle and a side baffle by welding. The side baffle is inclined and arranged on the upper end face of the seat body, and the inclined angle of the side baffle is set according to the side angle of the blade tenon installation plate to ensure that the side baffle is completely attached to the side of the blade tenon installation plate;

[0015] After installing the blade tenon, the end face baffle at the other end is installed on the seat body through screws;

[0016] The cover is in a C shape. The cover is arranged on the upper end face of the positioning base. After the inner sides of both sides of the side baffle are closely attached and clamped with the face of the cover, the cover is connected to the positioning base through screws;

[0017] A pin hole is provided on the outer cylindrical surface at the lower end of the shaft. The shaft is inserted into the mounting port of the support rod. The two pin holes are opposite, and are connected and positioned through a pin. Small holes are designed on the pin, and steel wires are inserted and fixed and tightened;

[0018] The mounting ring and the external gear ring are connected into one body by screws and pins and sleeved on the rotating shaft;

[0019] A deep groove ball bearing c is installed inside the mounting ring;

[0020] The bearing bush is stepped, and its end face is set on the end face of the inner ring of the deep groove ball bearing c. The outer diameter of the bearing bush is matched with the inner diameter of the end face bearing to radially limit the end face bearing. The step of the bearing bush is stuck on the axial end face of the end face bearing, and the bearing bush restricts the axial movement of the deep groove ball bearing c and the end face bearing;

[0021] The bearing baffle is arranged on the side of the end face bearing and installed on the mounting ring to prevent dust from entering the bearing. The retaining ring is locked on the rotating shaft by screws to block the bearing bush and limit the bearing;

[0022] The protective cover is arranged between the external gear ring and the disc and is connected to the external gear ring by screws to shield the gear transmission mechanism;

[0023] The limiting block is U-shaped. One end is installed on the mounting ring by screws, and the external gear ring and the mounting ring are integrally connected with the limiting block. The U-shaped groove at the other end of the limiting block is matched with the limiting rod, and the limiting rod is installed on the equipment wall;

[0024] The external gear ring meshes with the planetary gears on the disc, so that the planetary gears on the disc rotate synchronously with the main shaft of the equipment. Under the meshing action of the stationary external gear ring, each planetary gear can rotate independently, realizing the independent rotation and revolution of each blade.

[0025] For the preferred scheme of the thermal barrier coating application device for a turbine working blade, the inner surface of the positioning seat is in the shape of a mortise groove, which is consistent with the size and shape of the tenon of the blade;

[0026] The shape and position of the inner surfaces of the side baffle and the cover are consistent with the shape of the side of the mounting plate of the blade.

[0027] For the preferred scheme of the thermal barrier coating application device for a turbine working blade, the gear support rod and the positioning seat assembly are designed as a two-piece structure that can be quickly disassembled and assembled to adapt to the processing of blades of different sizes. When the blade size is different, only the positioning seat assembly part needs to be redesigned.

[0028] For the preferred scheme of the thermal barrier coating application device for a turbine working blade, the diameter of the limiting rod is matched with the U-shaped groove on the limiting block.

[0029] The installation process and working principle of a thermal barrier coating application device for a turbine working blade:

[0030] The left end shaft of the main shaft is connected to the equipment main shaft, undertaking the power and movement of the main shaft, and enabling the whole device to maintain synchronous revolution with the equipment main shaft. On the right end disc of the main shaft, 7 gear support rods are installed. One of the support rods is welded to the disc integrally and has a hole in the middle. A thermocouple is inserted into the inner cavity of the blade body to monitor the blade temperature. For the other 6 gear support rods, two sets of deep groove ball bearings are installed between them and the disc to ensure that each gear support rod can revolve with the main shaft and also rotate itself.

[0031] A face bearing and deep groove ball bearings are installed between the external gear ring and the main shaft. A limit block is installed on one side of it. There is a U-shaped groove on the limit block, which cooperates with the limit rod. Under the combined action of the bearing and the limit rod, the external gear ring does not rotate and meshes with the gear, providing a self-rotation guiding effect for each gear. In this way, under the action of the main shaft, each gear support rod makes synchronous revolution with the equipment main shaft, and under the action of the external gear ring, each gear support rod rotates simultaneously.

[0032] The positioning seat and the gear support rod are designed as a split structure. Through the cooperation of the left end shaft of the positioning seat and the right end hole of the gear support rod, plus pin positioning, small holes are designed on the pin, and steel wires are passed through and fixed and tightened to realize the quick-release connection between the positioning seat and the gear support rod. The design of this split structure realizes that except for the positioning seat, the rest of the base part of the device is a universal fixture. For the processing of blades with different sizes, only the positioning seat needs to be designed and manufactured according to the blade size. And during the clamping process between the device and the equipment, after the base part of the device is clamped with the equipment main shaft, there is no need to repeat the loading and unloading, and only the positioning seat part needs to be loaded and unloaded. The universality, processability and operability of the device are strong.

[0033] First, the blade tenon is inserted from the open end on the side of the positioning seat base; second, the end face baffle is installed and the two bolts on it are tightened. At this time, the complete positioning and clamping of the blade are realized; third, the cover is installed and the one bolt on it is tightened. At this time, the complete protection of the edge plate of the blade tenon end is realized. The innovative structural design of the positioning seat solves the problems of easy deformation of the traditional fixture and difficult loading and unloading of the blade, and the loading and unloading are convenient.

[0034] The beneficial effects of the present invention:

[0035] This technical solution realizes the stable and controllable revolution and self-rotation of the turbine working blade, and can monitor the heating temperature of the blade in real time, achieving the effect of preparing a thermal barrier coating with long life and high reliability. It ensures the consistency and stability of the coating application quality. This technology has been applied to the surface of the turbine blades of mass-produced engines. The number of coatings per furnace has been increased from 4 pieces to 6 pieces, and the efficiency has been increased by 50%. At the same time, the heating temperature of the blade surface can be measured in real time, effectively ensuring the consistency and stability of the coating application quality.

[0036] This technology can be popularized and applied to the coating of high-performance thermal barrier coatings for turbine blades of other engine models, and has broad market application prospects. Description of the Drawings

[0037] Figure 1 It is a schematic structural diagram of a thermal barrier coating application device for a turbine working blade;

[0038] Figure 2 It is a side view of a thermal barrier coating application device for a turbine working blade;

[0039] Figure 3 It is a schematic structural diagram of a mounting base;

[0040] Figure 4 It is a schematic diagram of an end cover baffle at the front end where the positioning base structure is not installed;

[0041] Figure 5 It is a schematic structural diagram of a positioning base;

[0042] Figure 6 It is a schematic structural diagram of a cover;

[0043] Figure 7 It is a schematic structural diagram of a main shaft connecting fixed shaft;

[0044] Figure 8 It is an effect diagram of a thermal barrier coating application device for a turbine working blade.

[0045] In the figure: 1. Main shaft, 2. Outer gear ring, 3. Positioning seat, 4. Limit rod, 5. Rotating shaft, 6. Disc, 7. Bushing a, 8. Deep groove ball bearing a, 9. Fixed shaft, 10. Hole, 11. Groove, 12. Gear support rod, 13. Bushing b, 14. Bushing c, 15. Deep groove ball bearing b, 16. Support rod, 17. Planetary gear, 18. End cover, 19. Positioning base, 20. Cover, 21. Shaft, 22. Seat body, 23. End face baffle, 24. Side baffle, 25. Plug pin, 26. Installation ring, 27. Deep groove ball bearing c, 28. End face bearing, 29. Bearing bushing, 30. Bearing baffle, 31. Retaining ring, 32. Protective sleeve, 33. Limit block, 34. Retaining ring. Detailed Description of the Preferred Embodiment

[0046] The following further details the present invention in conjunction with the Figure 1-8 drawings and embodiments.

[0047] A thermal barrier coating application device for a turbine working blade, characterized in that it includes a main shaft 1, an outer gear ring 2, a positioning seat 3 and a limit rod 4;

[0048] The main shaft 1 is a welded assembly and is composed of a rotating shaft 5 and a disc 6;

[0049] Set the positions of seven bushings a7 evenly distributed by welding on the disk 6 on one side of the main shaft 1. Six bushings a7 are set, and two deep groove ball bearings a8 are set in each bushing a7. On the other side of the disk 6 at the relative position of the other bushing a7, a fixed shaft 9 is welded;

[0050] A hole 10 is provided at the middle position of the rotating shaft 5. Grooves 11 are provided on the side walls of the rotating shaft 5 on both sides of the hole 10, and the hole 10 communicates with the grooves 11;

[0051] The gear support rod 12 includes a bushing b13, a bushing c14, a deep groove ball bearing b15, a support rod 16 and a planetary gear 17;

[0052] The bushing b13 and the bushing c14 are arranged between the two deep groove ball bearings b15. The bushing b13 is arranged on the outer layer of the bushing c14. The support rod 16 is inserted into the bushing b13; the end cover 18 is arranged on the end face of the bushing a;

[0053] One end of the support rod 16 is provided with a mounting port. A pin hole is provided on the outer wall of the mounting port. The other end is provided with a keyway and a ring groove. The planetary gear 17 is keyed in the keyway of the support rod 16. The ring groove is arranged on the left side of the keyway. A snap ring 34 is arranged in the ring groove to limit the axial movement of the planetary gear 17 to the left;

[0054] The positioning seat 3 is composed of a positioning base 19 and a cover 20;

[0055] The positioning base 19 is composed of a shaft 21, a seat body 22, an end face baffle 23 and a side baffle 24 by welding. Only one end face baffle 23 is installed. The side baffle 24 is inclined and arranged on the upper end face of the seat body 22. The inclination angle of the side baffle 24 is set according to the side angle of the blade tenon installation plate to ensure that the side baffle 24 is completely attached to the side of the blade tenon installation plate;

[0056] After installing the blade tenon, the end face baffle 23 at the other end is installed on the seat body 22 by screws;

[0057] The cover 20 is in a C shape. The cover 20 is arranged on the upper end face of the positioning base 19. After the inner sides of both sides of the side baffle 24 are closely attached to the face of the cover 20, the cover 20 is connected to the positioning base 19 by screws;

[0058] A pin hole is provided on the outer cylindrical surface at the lower end of the shaft 21. The shaft is inserted into the mounting port of the support rod 16. The two pin holes are opposite to each other and are connected and positioned by a pin 25. Small holes are designed on the pin 25 and steel wires are passed through for fixing and winding;

[0059] The mounting ring 26 and the external gear ring 2 are connected into one body by screws and pins and sleeved on the rotating shaft 5;

[0060] A deep groove ball bearing c27 is installed inside the mounting ring 26;

[0061] The bearing bush 29 is stepped, and its end face is arranged on the end face of the inner ring of the deep groove ball bearing c27. The outer diameter of the bearing bush 29 is matched with the inner diameter of the end face bearing 28 to radially limit the end face bearing 28. The step of the bearing bush 29 is stuck on the axial end face of the end face bearing 28, and the bearing bush 29 restricts the axial movement of the deep groove ball bearing c27 and the end face bearing 28;

[0062] The bearing baffle 30 is arranged on the side of the end face bearing 28 and is installed on the mounting ring to prevent dust from entering the bearing. The retaining ring 31 is locked on the rotating shaft by screws to block the bearing bush 29 and limit the bearing;

[0063] The protective cover 32 is arranged between the external gear ring 2 and the disc and is connected to the external gear ring 2 by screws to shield the gear transmission mechanism;

[0064] The limiting block 33 is U-shaped. One end is installed on the mounting ring 26 by screws, and the external gear ring 32 and the mounting ring 26 are integrally connected with the limiting block 33. The U-shaped groove at the other end of the limiting block 33 cooperates with the limiting rod 4, and the limiting rod 4 is installed on the equipment wall;

[0065] The external gear ring 2 meshes with the planetary gears 17 on the disc 6, so that the planetary gears 17 on the disc 6 rotate synchronously with the main shaft of the equipment. Under the meshing action of the stationary external gear ring 2, each planetary gear 17 can rotate independently, realizing the self-rotation and revolution of each blade.

[0066] The inner surface of the positioning seat 3 is tenon groove-shaped, which is consistent with the size and shape of the tenon of the blade;

[0067] The shapes and positions of the inner surfaces of the side baffle 24 and the cover 20 are consistent with the shape of the side of the mounting plate of the blade.

[0068] The gear support rod 12 and the positioning seat 3 are designed as a two-piece structure that can be quickly loaded and unloaded to adapt to the processing of blades of different sizes. When the blade sizes are different, only the positioning seat 3 part needs to be redesigned.

[0069] The diameter of the limiting rod 4 matches the U-shaped groove on the limiting block 33.

[0070] The installation process and working principle of a thermal barrier coating application device for a turbine working blade:

[0071] The left end of the main shaft is connected to the equipment main shaft, receiving the power and motion of the main shaft, and keeping the whole device revolving synchronously with the equipment main shaft. On the right end disc of the main shaft, 7 gear support rods are installed. One of the support rods is welded to the disc integrally and has a hole in the middle. A thermocouple is inserted into the inner cavity of the blade body to monitor the blade temperature. For the other 6 gear support rods, two sets of deep groove ball bearings are installed between them and the disc to ensure that each gear support rod can revolve with the main shaft and also rotate itself.

[0072] A face bearing and deep groove ball bearings are installed between the external gear ring and the main shaft. A limit block is installed on one side of it. There is a U-shaped groove on the limit block, which cooperates with the limit rod. Under the combined action of the bearing and the limit rod, the external gear ring does not rotate and meshes with the gears, providing a self-rotation guiding effect for each gear. In this way, under the action of the main shaft, each gear support rod revolves synchronously with the equipment main shaft, and under the action of the external gear ring, each gear support rod rotates simultaneously.

[0073] The positioning seat and the gear support rod are designed as a split structure. Through the cooperation between the left end shaft of the positioning seat and the right end hole of the gear support rod, together with pin positioning, small holes are designed on the pins and steel wires are passed through and fixed and tightened to achieve a quick-release connection between the positioning seat and the gear support rod. The design of this split structure makes the rest of the device base part a universal fixture except for the positioning seat. For the machining of blades with different sizes, only the positioning seat needs to be designed and manufactured according to the blade size. During the clamping process between the device and the equipment, after the base part of the device is clamped with the equipment main shaft, there is no need to repeat the loading and unloading, and only the positioning seat part needs to be loaded and unloaded. The universality, processability and operability of the device are strong.

[0074] First, the blade tenon is inserted from the open end on the side of the positioning seat base; second, install the end face baffle and tighten the two bolts on it. At this time, the complete positioning and clamping of the blade are achieved; third, install the cover and tighten the one bolt on it. At this time, the complete protection of the edge plate at the tenon end of the blade is achieved. The innovative structural design of the positioning seat solves the problems of easy deformation of traditional fixtures and difficult loading and unloading of blades, and the loading and unloading are convenient.

Claims

1. A thermal barrier coating applying device for a turbine working blade, characterized in that: It includes a main shaft, an external gear ring, a positioning seat and a limiting rod; The main shaft is a welded assembly, composed of a rotating shaft and a disc; On the disc on one side of the main shaft, the positions of seven bushings a are evenly distributed by welding. Six bushings a are provided, and two deep groove ball bearings a are arranged in each bushing a. A fixed shaft is welded and fixed on the other side of the disc at the relative position of the other bushing a; A hole is provided in the middle position of the rotating shaft, and grooves are provided on the side walls of the rotating shaft on both sides of the hole, and the hole communicates with the grooves; The gear support rod includes a bushing b, a bushing c, a deep groove ball bearing b, a support rod and a planetary gear; The bushing b and the bushing c are arranged between the two deep groove ball bearings b. The bushing b is arranged on the outer layer of the bushing c. The support rod is inserted into the bushing b; The end cover is arranged on the end face of the bushing a; One end of the support rod is provided with a mounting port, and a pin hole is provided on the outer wall of the mounting port. The other end is provided with a key groove and a ring groove. The planetary gear is keyed in the key groove of the support rod. The ring groove is arranged on the left side of the key groove, and a snap ring is arranged in the ring groove to limit the axial movement of the planetary gear to the left; The positioning seat is composed of a positioning base and a cover; The positioning base is composed of a shaft, a seat body, an end face baffle and a side baffle by welding. The side baffle is inclined and arranged on the upper end face of the seat body. The inclination angle of the side baffle is set according to the side angle of the blade tenon mounting plate to ensure that the side baffle is completely attached to the side of the blade tenon mounting plate; After installing the blade tenon, the end face baffle at the other end is installed on the seat body through screws; The cover is in a C shape. The cover is arranged on the upper end face of the positioning base. After the inner side faces on both sides of the side baffle are closely attached and clamped with the cover, the cover is connected to the positioning base through screws; A pin hole is provided on the outer cylindrical surface at the lower end of the shaft. The shaft is inserted into the mounting port of the support rod. The two pin holes are opposite to each other and are connected and positioned through a pin. Small holes are designed on the pin, and steel wires are penetrated for fixing and winding; The mounting ring and the external gear ring are connected into one body by screws and pins and sleeved on the rotating shaft; A deep groove ball bearing c is installed inside the mounting ring; The bearing bushing is in a stepped shape. Its end face is arranged on the end face of the inner ring of the deep groove ball bearing c. The outer diameter of the bearing bushing is matched with the inner diameter of the end face bearing to radially limit the end face bearing. The step of the bearing bushing is stuck on the axial end face of the end face bearing. The bearing bushing restricts the axial movement of the deep groove ball bearing c and the end face bearing; The bearing baffle is arranged on the side of the end face bearing and is installed on the mounting ring to prevent dust from entering the bearing; The snap ring is locked on the rotating shaft through screws to block the bearing bushing and limit the bearing; The protective cover is arranged between the external gear ring and the disc and is connected to the external gear ring through screws; The limiting block is in a U shape. One end is installed on the mounting ring through screws, and the external gear ring and the mounting ring are connected to the limiting block as a whole. The U-shaped groove at the other end of the limiting block cooperates with the limiting rod, and the limiting rod is installed on the equipment wall; The external gear ring meshes with the planetary gears on the disc, so that the planetary gears on the disc rotate synchronously with the main shaft of the equipment. Under the meshing action of the stationary external gear ring, each planetary gear can rotate independently, realizing the rotation and revolution of each blade.

2. The thermal barrier coating applying device for a turbine working blade according to claim 1, wherein: The inner surface of the positioning seat is in the shape of a mortise groove, which is consistent with the size and shape of the tenon of the blade; The shapes and positions of the side baffle and the inner surface of the cover are consistent with the shape of the side surface of the mounting plate of the blade.

3. The thermal barrier coating application device for a turbine working blade according to claim 1, wherein: The gear support rod and the positioning seat assembly are designed as a two-piece structure that can be quickly loaded and unloaded to adapt to the processing of blades of different sizes. When the blade sizes are different, only the positioning seat assembly part needs to be redesigned.

4. A thermal barrier coating application device for a turbine working blade according to claim 1, characterized in that: The diameter of the limiting rod matches the U-shaped groove on the limiting block.

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