Guide vane flow detection mechanism and use method

Abstract

The invention relates to the technical field of blade detection equipment, in particular to a guide vane flow detection mechanism and a use method. The guide vane flow detection mechanism comprises a detector, two groups of ventilation chambers and two groups of plugs; each group of ventilation chambers is communicated with the detection machine; positioning holes are formed in each group of ventilation chambers; the two positioning holes are arranged oppositely and correspond to an inner boss and an outer boss of the guide vane respectively, so that the inner boss and the outer boss are fixed in the positioning holes respectively; the two plugs are arranged in the ventilation chambers respectively and correspond to the openings in one ends of the blade bodies respectively, so that the plugs can plug or open the openings in one ends of the blade bodies. When the guide vane flow detection mechanism is used, the two ends of the guide vane are placed in the positioning holes respectively. The ventilation state is changed by changing the plugging state of the plug. And the detector obtains the ventilation capacity in each ventilation state according to the air pressure reduction condition in each ventilation state.

Description

Technical Field

[0001] The present invention relates to the technical field of blade detection equipment, and in particular to a guide vane flow detection mechanism and a use method thereof. Background Art

[0002] Turbine guide vanes, also known as guide vanes, are key components of aircraft engine turbines and are primarily composed of a blade body, a boss, a tenon, a cooling system, and a coating. The blade body, as a core component, is airfoil-shaped, with an inner boss and an outer boss connected at each end. A cooling airflow channel is provided inside the blade body, and the channel connects both ends of the blade body. The channel wall is provided with a number of through holes, which serve as air film holes. After the cooling gas is discharged through the air film holes, a low-temperature air film is formed on the surface of the blade body, thereby preventing the blade body from overheating and enabling the blade body to withstand temperatures exceeding 1500°C.

[0003] The inner and outer bosses are located at either end of the blade. The outer boss is connected to the turbine casing, while the inner boss is closer to the axis. These two bosses work together with adjacent components through sealing teeth and gas seal grooves to secure the blade, reduce gas leakage, prevent energy loss, and protect the bearing cavity. The inner and outer bosses are also equipped with several air film holes.

[0004] The setting of the film holes plays a vital role in the temperature control of the guide vanes. Therefore, it is necessary to detect the ventilation volume of the film holes of each part of the guide vanes. The guide vanes will be in different working conditions during operation, and the ventilation conditions of the guide vanes are different in each working condition. For example, the film holes of the inner and outer bosses and the blade body are ventilated at the same time, only the film holes of the inner boss are ventilated, only the film holes of the outer boss are ventilated, the film holes of the inner boss and the blade body are ventilated at the same time, and the film holes of the outer boss and the blade body are ventilated at the same time. The existing technology does not have a device for detecting the ventilation conditions of the guide vanes in various working conditions, which makes the detection process complicated and inefficient. Summary of the Invention

[0005] The object of the present invention is to provide a guide vane flow detection mechanism and a method for use, which can conveniently detect the air flow in each channel of the guide vane.

[0006] The embodiments of the present invention are achieved through the following technical solutions: A guide vane flow detection mechanism comprises a detection machine, two groups of ventilation chambers and two groups of plugs; each group of the ventilation chambers is connected to the detection machine; each group of the ventilation chambers is provided with a positioning hole; the two positioning holes are arranged opposite to each other and each corresponds to the inner boss and outer boss of the guide vane, so that the inner boss and the outer boss are each fixed to one of the positioning holes; the two groups of plugs are each arranged inside one of the ventilation chambers and each corresponds to an opening at one end of the blade body, so that the plug can seal or open the opening at one end of the blade body.

[0007] Furthermore, the plug includes a mounting seat and a blocking block; the blocking block is slidably arranged on the mounting seat; the blocking block is provided with a magnetic block; the mounting seat is provided with an electromagnet in conjunction with the magnetic block, so that when the electromagnet is energized, the electromagnet repels the magnetic block so that the blocking block abuts against the opening of the blade.

[0008] Furthermore, the blocking block is provided with a guide rod; the guide rod is slidably arranged inside the mounting seat.

[0009] Furthermore, the mounting seat is provided with a contact; the inner wall of the ventilation chamber is provided with an elastic sheet in cooperation with the contact, so that when the mounting seat is installed inside the ventilation chamber, the elastic sheet abuts against the contact; and the elastic sheet is connected to a power source.

[0010] Furthermore, the ventilation chamber is connected to the detection machine through a pipeline; the pipeline is provided with a valve; and an air pressure sensor is also provided at the connection between the pipeline and the ventilation chamber.

[0011] Furthermore, the ventilation chamber includes a bottom plate, a back plate, a top plate and two side plates; the top plate and the bottom plate are both vertically extended with sealing plates, so that the two sealing plates and the two side plates enclose a positioning hole; the back plate is connected to the pipe; and the mounting seat is fixed to the back plate.

[0012] Furthermore, rubber pads are provided at the joints between the bottom plate, the back plate, the top plate and the two side plates.

[0013] Furthermore, the plug includes a blocking block, a connecting bolt and a positioning block; the connecting bolt is connected to one end of the blocking block; the other end of the connecting bolt passes through the channel of the blade and is connected to the positioning block; the length of the positioning block is greater than the width of the channel.

[0014] Furthermore, the blocking block is provided with a threaded hole; the connecting bolt is threadedly connected to the threaded hole; and the threaded hole is a blind hole.

[0015] A method for using a guide vane flow detection mechanism comprises placing both ends of the guide vane in a positioning hole; changing the blocking state of the plug so that the ventilation states are respectively: simultaneous ventilation of the inner and outer bosses and the air film holes of the blade body; ventilation of only the air film holes of the inner boss; ventilation of only the air film holes of the outer boss; simultaneous ventilation of the air film holes of the inner boss and the blade body; and simultaneous ventilation of the air film holes of the outer boss and the blade body; and a detection machine obtains the ventilation volume in each ventilation state according to the air pressure reduction in each ventilation state.

[0016] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects: When the guide vane flow detection mechanism of the present invention is used, each end of the guide vane is placed in a positioning hole. The blocking state of the plug is changed so that the ventilation states are respectively: the inner and outer bosses and the air film holes of the blade body are ventilated simultaneously, only the air film holes of the inner boss are ventilated, only the air film holes of the outer boss are ventilated, the air film holes of the inner boss and the blade body are ventilated simultaneously, and the air film holes of the outer boss and the blade body are ventilated simultaneously. The detection machine derives the ventilation volume in each ventilation state based on the air pressure reduction in each ventilation state. This method can conveniently measure the ventilation conditions of the guide vane in each ventilation state.

[0017] The plug includes a mounting seat and a blocking block, and the blocking block is slidably arranged on the mounting seat. The blocking block is provided with a magnetic block. The mounting seat and the magnetic block are provided with an electromagnet, and the two are arranged relative to each other, so that when the electromagnet is energized, the electromagnet repels the magnetic block so that the blocking block abuts against the opening of the blade body. By controlling the on and off of the two electromagnets, the closing and opening of both ends of the channel can be achieved. In this way, the on and off of one end of the channel can be conveniently controlled, thereby achieving various ventilation states of the guide vane. Avoiding frequent opening of the top plate to adjust the plug device inside the ventilation chamber improves detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the guide vane flow detection mechanism.

[0019] Figure 2 It is a schematic diagram of the coordination between the mounting seat, the blocking block and the guide vane.

[0020] Figure 3 for Figure 2 Enlarged view of point a in the middle.

[0021] Figure 4 It is a cross-sectional view of the cooperation between the mounting seat, the blocking block and the guide vane.

[0022] Figure 5 for Figure 4 Enlarged view of point b in the middle.

[0023] Figure 6 This is a schematic diagram of the connection between the sealing block and the guide vane through the connecting bolts.

[0024] Figure 7 for Figure 6 Enlarged view of point c in the middle.

[0025] Figure 8 This is a cross-sectional view of the sealing block connected to the guide vane through connecting bolts.

[0026] Figure 9 for Figure 8 Enlarged view of point d in the middle.

[0027] Figure markings: 1-positioning hole, 2-inner boss, 3-outer boss, 4-blade, 5-mounting seat, 6-sealing block, 7-magnetic block, 8-channel, 9-electromagnet, 10-guide rod, 11-contact, 12-elastic sheet, 13-valve, 14-air pressure sensor, 15-bottom plate, 16-back plate, 17-top plate, 18-side plate, 19-sealing plate, 20-pipeline, 21-rubber pad, 22-connecting bolt, 23-positioning block. DETAILED DESCRIPTION

[0028] like Figures 1-9 As shown, the present invention provides a guide vane flow detection mechanism, including a detection machine, two sets of ventilation chambers and two sets of plugs. Each set of ventilation chambers is connected to the detection machine through a pipe 20. The ventilation chamber includes a bottom plate 15, a back plate 16, a top plate 17 and two side plates 18. Figure 1 and Figure 2 As shown, the bottom plate 15, the back plate 16, the top plate 17 and the two side plates 18 are enclosed in a rectangular box shape and fixed to each other by screws. The top plate 17 and the bottom plate 15 are both vertically extended with a sealing plate 19, so that the two sealing plates 19 and the two side plates 18 enclose a positioning hole 1. The shape and size of the positioning hole 1 are the same as the inner boss 2 and the outer boss 3 of the guide vane. Specifically, the shape and size of the positioning hole 1 of one ventilation chamber are the same as the inner boss 2, and the shape and size of the positioning hole 1 of the other ventilation chamber are the same as the outer boss 3. The inner boss 2 and the outer boss 3 can be tightly confined in the positioning hole 1, ensuring the stability and sealing of the guide vane fixation. When taking and placing the guide vane, the top plate 17 can be removed by unscrewing the screws of the top plate 17. At this time, the guide vane and the plug can be put in or taken out, and then the top plate 17 can be fixed with screws. Rubber pads 21 are installed at the joints between the bottom plate 15, back plate 16, top plate 17, and the two side plates 18 to ensure the airtightness of the ventilation chamber. Two sets of plugs are installed inside each ventilation chamber, corresponding to the opening at one end of the blade 4, so that the plugs can close or open the opening at the end of the blade 4. The back plate 16 is connected to the pipe 20.

[0029] The detection device is an existing device, primarily comprising an air pressure detection and control unit. Specifically, the detection device provides a high-pressure gas source. The high-pressure gas enters the pipe 20 through the exhaust port, then into the ventilation chamber, and finally into the inner boss 2 or outer boss 3 or channel 8 of the guide vane. Because the guide vane's channel 8 is externally connected, a pressure drop occurs upon entry of the high-pressure gas. The pressure drop is determined by comparing the pressure of the high-pressure gas source with the pressure at the exhaust port. Based on this pressure drop, the guide vane's ventilation capacity can be calculated.

[0030] When the guide vane flow detection mechanism of the present invention is used, the inner boss 2 and outer boss 3 of the guide vane are respectively clamped in the two positioning holes 1. The blocking state of the plug is then changed so that the ventilation states are respectively: simultaneous ventilation of the inner and outer bosses 3 and the air film holes of the blade body 4; ventilation of only the air film holes of the inner boss 2; ventilation of only the air film holes of the outer boss 3; simultaneous ventilation of the air film holes of the inner boss 2 and the blade body 4; and simultaneous ventilation of the air film holes of the outer boss 3 and the blade body 4. The detection machine determines the ventilation volume in each ventilation state based on the air pressure reduction in each ventilation state.

[0031] The specific gas flow rate is calculated as follows: According to the Bernoulli equation and the Darcy-Weisbach formula, when the gas flows in channel 8, there is a definite relationship between the gas pressure drop (pressure drop ΔP) and the flow rate (Q): ΔP=f*(L / D)*(ρv 2 / 2) in: ΔP is the air pressure difference (Pa).

[0032] f is the friction coefficient (related to the flow state and wall roughness), including the friction coefficient of the exhaust port of the detection device.

[0033] L / D: The ratio of the flow length to the flow area diameter. The flow length is the total length of the exhaust port of the detection device. The diameter of the exhaust port is set to D, which is the flow area diameter D.

[0034] ρ is the gas density (kg / m³).

[0035] v is the gas velocity (m / s), and the flow rate Q satisfies Q=v*A (A is the cross-sectional area of channel 8).

[0036] By measuring the pressure drop ΔP, combined with the known geometric parameters of the channel 8 and gas properties, the flow rate Q can be inferred.

[0037] Q = π (D / 2) 2 Example 1: In this embodiment, the plug includes a mounting seat 5 and a blocking block 6. Figure 2-Figure 5 As shown, the blocking block 6 is slidably mounted on the mounting base 5. The blocking block 6 is provided with a magnetic block 7. The mounting base 5 is provided with an electromagnet 9 that cooperates with the magnetic block 7, and the two are arranged opposite each other. When the electromagnet 9 is energized, the electromagnet 9 repels the magnetic block 7, causing the blocking block 6 to abut the opening of the blade 4. The mounting base 5 is fixed to the back plate 16.

[0038] During use, the two ends of the channel 8 can be closed and opened by controlling the on and off of the two electromagnets 9. Specifically, when the electromagnet 9 of the plug corresponding to the inner boss 2 is energized, the magnetic force of the electromagnet 9 repels the magnetic force of the magnetic block 7, thereby pushing the blocking block 6 away from the mounting seat 5, thereby pressing against one end of the channel 8 inside the blade 4, closing the channel 8. When the electromagnet 9 is de-energized, the electromagnet 9 loses its magnetic force, and the magnetic force of the magnetic block 7 attracts the iron core of the electromagnet 9, thereby pushing the blocking block 6 away from the end of the channel 8 inside the blade 4, opening the channel 8. In fact, the sliding distance of the plug relative to the mounting seat 5 is about 2 mm. This gap ensures that airflow can smoothly enter the channel 8 inside the blade 4. At the same time, this gap also ensures that the magnetic force between the magnetic block 7 and the iron core of the electromagnet 9 is still sufficient to pull the blocking block 6 back to the mounting seat 5. In this way, the on and off of one end of the channel 8 can be conveniently controlled, thereby achieving various ventilation states of the guide vane. Avoid frequently opening the top plate 17 to adjust the plug device inside the ventilation chamber.

[0039] In this embodiment, the blocking block 6 is provided with a guide rod 10. The guide rod 10 is slidably arranged inside the mounting seat 5. This makes the movement of the blocking block 6 more stable and reliable.

[0040] In this embodiment, the mounting base 5 is provided with a contact 11. Figure 5 As shown, the inner wall of the ventilation chamber is provided with an elastic sheet 12 to mate with the contact 11. When the mounting base 5 is installed inside the ventilation chamber, the elastic sheet 12 abuts against the contact 11. The elastic sheet 12 is made of copper and is connected to a power source. A switch connected to the elastic sheet 12 controls the power supply to the electromagnet 9. This also prevents the introduction of electrical wires directly into the ventilation chamber, which could compromise the airtightness of the ventilation chamber.

[0041] In this embodiment, the pipe 20 is equipped with a valve 13 to facilitate control of the ventilation status of each ventilation chamber. A pressure sensor 14 is also installed at the connection between the pipe 20 and the ventilation chamber. This pressure sensor 14 detects the air pressure within the ventilation chamber and compares this pressure with the pressure of the high-pressure gas provided by the detector to calculate the ventilation volume. Because the detector and the ventilation chamber are connected by a long pipe 20, the gas will experience a pressure drop after passing through the pipe 20. Therefore, installing a pressure sensor in the ventilation chamber can more accurately detect the air pressure within the ventilation chamber.

[0042] Example 2: In this embodiment, only the structure of the plug is different from that of embodiment 1, and the other structures are the same as those of embodiment 1. The plug of this embodiment includes a blocking block 6, a connecting bolt 22 and a positioning block 23. Figure 6-Figure 9As shown, the connecting bolt 22 is connected to one end of the blocking block 6. The other end of the connecting bolt 22 passes through the channel 8 of the blade 4 and is connected to the positioning block 23. The length of the positioning block 23 is greater than the width of the channel 8, so that the positioning block 23 cannot pass through the channel 8 inside the blade 4. This allows the connecting bolt 22 and the positioning block 23 to cooperate to tighten the blocking block 6 to the opening at one end of the channel 8, thereby blocking one end of the channel 8. A set of blocking blocks 6 corresponds to each end of the blade 4. Then, the corresponding end of the channel 8 is blocked as needed. This plug requires the top plate 17 to be disassembled in order to adjust the state of blocking the channel 8.

[0043] In this embodiment, the blocking block 6 is provided with a threaded hole. A connecting bolt 22 is threadedly connected to the threaded hole. The threaded hole is a blind hole. This allows the connecting bolt 22 to be more conveniently connected to the blocking head. Furthermore, the blind hole prevents gas from leaking through the gap between the connecting bolt 22 and the threaded hole, thus ensuring airtightness.

[0044] This embodiment also provides a method for using a guide vane flow detection mechanism, placing each end of the guide vane in a positioning hole 1. The blocking state of the plug is changed so that the ventilation states are respectively: the inner and outer bosses 3 and the air film holes of the blade body 4 are ventilated at the same time, only the air film holes of the inner boss 2 are ventilated, only the air film holes of the outer boss 3 are ventilated, the air film holes of the inner boss 2 and the blade body 4 are ventilated at the same time, and the air film holes of the outer boss 3 and the blade body 4 are ventilated at the same time. The detection machine derives the ventilation volume in each ventilation state based on the air pressure reduction in each ventilation state. This method can conveniently measure the ventilation conditions of the guide vane in each ventilation state.

Claims

1. A guide vane flow detection mechanism, characterized by: It includes a detection machine, two groups of ventilation chambers and two groups of plugs; each group of the ventilation chambers is connected to the detection machine; each group of the ventilation chambers is provided with a positioning hole; the two positioning holes are arranged opposite to each other and each corresponds to the inner boss and outer boss of the guide vane, so that the inner boss and the outer boss are each fixed to one of the positioning holes; the two groups of plugs are each arranged inside one of the ventilation chambers and each corresponds to an opening at one end of the blade, so that the plug can seal or open the opening at one end of the blade.

2. The guide vane flow detection mechanism according to claim 1, characterized in that: The plug includes a mounting seat and a blocking block; the blocking block is slidably arranged on the mounting seat; the blocking block is provided with a magnetic block; the mounting seat is provided with an electromagnet in conjunction with the magnetic block, so that when the electromagnet is energized, the electromagnet repels the magnetic block so that the blocking block abuts against the opening of the blade.

3. The guide vane flow detection mechanism according to claim 2, characterized in that: The blocking block is provided with a guide rod; the guide rod is slidably arranged inside the mounting seat.

4. The guide vane flow detection mechanism according to claim 3, characterized in that: The mounting seat is provided with a contact; the inner wall of the ventilation chamber is provided with an elastic piece to cooperate with the contact, so that the elastic piece abuts against the contact when the mounting seat is installed inside the ventilation chamber; the elastic piece is connected to a power supply.

5. The guide vane flow detection mechanism according to claim 4, characterized in that: The ventilation chamber is connected to the detection machine through a pipeline; the pipeline is provided with a valve; and an air pressure sensor is also provided at the connection between the pipeline and the ventilation chamber.

6. The guide vane flow detection mechanism according to claim 5, characterized in that: The ventilation chamber includes a bottom plate, a back plate, a top plate and two side plates; the top plate and the bottom plate are both vertically extended with sealing plates, so that the two sealing plates and the two side plates enclose a positioning hole; the back plate is connected to the pipe; the mounting seat is fixed to the back plate.

7. The guide vane flow detection mechanism according to claim 6, characterized in that: The joints between the bottom plate, the back plate, the top plate and the two side plates are all provided with rubber pads.

8. The guide vane flow detection mechanism according to claim 1, characterized in that: The plug includes a blocking block, a connecting bolt and a positioning block; the connecting bolt is connected to one end of the blocking block; the other end of the connecting bolt passes through the channel of the blade and is connected to the positioning block; the length of the positioning block is greater than the width of the channel.

9. The guide vane flow detection mechanism according to claim 8, characterized in that: The blocking block is provided with a threaded hole; the connecting bolt is threadedly connected to the threaded hole; and the threaded hole is a blind hole.

10. A method for using a guide vane flow detection mechanism, characterized in that: Place each end of the guide vane in a positioning hole; change the sealing state of the plug so that the ventilation states are: simultaneous ventilation of the inner and outer bosses and the air film holes of the blade body, ventilation of only the air film holes of the inner boss, ventilation of only the air film holes of the outer boss, simultaneous ventilation of the air film holes of the inner boss and the blade body, and simultaneous ventilation of the air film holes of the outer boss and the blade body; the detection machine obtains the ventilation volume in each ventilation state based on the air pressure reduction in each ventilation state.

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