Mounting structure of blade with adjustable inlet

Abstract

The utility model relates to the technical field of gas turbines, in particular to a mounting structure of an inlet-adjustable blade, which comprises a bushing arranged between a blade root of the blade and a mounting hole on a cylinder body, a first oil storage tank arranged on the inner circumferential side surface of the bushing matched with the blade root, and an oil injection hole arranged on the end surface of one end of the bushing close to the outside of the cylinder body, the oil injection hole is communicated with the first oil storage groove. In the assembling process, lubricating grease is injected into the oil injection hole in the bush, the first oil storage groove is filled with the lubricating grease till the lubricating grease overflows, the inner circumferential side face of the bush is coated with the overflowed lubricating grease, then the bush is assembled with the mounting hole of the cylinder body and the blade root of the blade, and the assembling gap is adjusted to be in place. In the maintenance process, lubricating grease can be added to the inner side of the lining through the oil injection hole in the lining. The lubricating oil amount can be effectively increased, the lubricating effect is improved, the effective lubricating time is prolonged, maintenance and oil injection are easy, and the problem of rotation jamming of the inlet adjustable blade can be effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas turbines, in particular to a mounting structure of inlet adjustable blades. Background Art

[0002] With the continuous development of gas turbine technology, the performance and efficiency requirements of gas turbines are getting higher and higher. In addition to optimizing the blade shape of the blade itself, adjusting the blade angle during the operation of the gas turbine can control the intake volume and airflow direction of the intake airflow, thereby improving the operating efficiency and variable load operation capability of the gas turbine. Therefore, it is more common to have a single-stage or multi-stage inlet adjustable blade structural design in the gas turbine.

[0003] The blade root of the imported adjustable blade is a long handle-like structure. The blade root is rotatably mounted on the cylinder body and connected to the rocker arm. An inner ring is coaxially arranged inside the cylinder body, and the blade top is mounted on the inner ring, so that the blade is installed between the cylinder body and the inner ring. The blade root can be rotated by rotating the rocker arm to rotate the blade to achieve the purpose of adjusting the blade angle.

[0004] In order to reduce the contact friction during rotation, the blade root is usually not in direct contact with the cylinder body, but cooperates with the cylinder body through the bushing structure and the half-bearing. There are two ways to reduce the contact friction with this structure: the first way is to coat the blade root and the inner wall of the bushing with grease before assembly; the second way is to install a self-lubricating bearing in the bushing. The disadvantage of the first method mentioned above is that the amount of grease applied is limited. After running for a period of time, the grease becomes ineffective, the friction increases, and it is easy to cause the blade to rotate jammed. During an overhaul cycle, it may be necessary to disassemble the bushing and re-apply grease many times, which is cumbersome and time-consuming. The self-lubricating bearings of the second method mentioned above have a longer lubrication life, but this type of self-lubricating bearings are usually imported and the supply channels are unstable. If domestic self-lubricating bearings are used, the life of the self-lubricating bearings may be at risk of not being able to meet the requirements of an overhaul cycle.

[0005] In addition, the current method for measuring the rotation amount of the inlet adjustable blades is mainly to use a machined plane of the gas turbine housing as the positioning surface, use tools to measure the angle between the positioning surface and the machined plane on the rocker arm, and calculate the blade rotation angle by comparing it with the original angle. This method of measurement is very inconvenient and very difficult to measure when there is a lack of tools. Utility Model Content

[0006] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the utility model is to provide a mounting structure of an imported adjustable blade, which can increase the effective lubrication time and facilitate maintenance.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0008] The utility model provides an installation structure of an inlet adjustable blade, wherein the blade is arranged inside a cylinder body, and the blade root of the blade is rotatably installed in a mounting hole on the cylinder body, the installation structure comprises a bushing, the bushing is arranged between the blade root and the mounting hole, a first oil storage groove is provided on the inner peripheral side surface where the bushing matches the blade root, an oil filling hole is provided on an end surface of the bushing close to the outside of the cylinder body, and the oil filling hole is communicated with the first oil storage groove.

[0009] Preferably, the first oil storage groove includes a straight groove extending along the axial direction of the bushing and a plurality of annular grooves extending along the circumferential direction of the bushing. The plurality of annular grooves are spaced apart along the axial direction of the bushing and are interconnected through the straight grooves. The annular groove closest to the oil filling hole is connected to the oil filling hole.

[0010] Preferably, the blade tip is mounted on an inner ring coaxially sleeved in the cylinder body, and the mounting structure also includes a half-bearing, which is arranged between the blade tip and the inner ring, and a second oil storage groove is provided on the inner circumferential surface where the half-bearing cooperates with the blade tip.

[0011] Preferably, a blade tip platform embedded in the inner ring is provided between the blade tip and the blade body of the blade, and a first sealing ring is provided between the outer peripheral surface of the blade tip platform and the inner ring.

[0012] Preferably, it also includes a threaded ring and a rocker arm, the inner circumference of the threaded ring is provided with an internal thread, the outer circumference of the end of the bushing close to the outside of the cylinder body is provided with an external thread and extends out of the mounting hole, the external thread and the internal thread are matched and connected, the threaded ring is connected to the cylinder body by a first bolt, the blade root is rotatably inserted into the bushing, the rocker arm is connected to the blade root outside the cylinder body by a second bolt and covers the bushing, a blade root platform embedded in the cylinder body is provided between the blade root and the blade body, and a second sealing ring is provided between the outer circumference of the blade root platform and the cylinder body.

[0013] Preferably, a grease nipple is installed on the oil filling hole, or a avoidance hole for exposing the oil filling hole is opened on the rocker arm at a position corresponding to the oil filling hole, and a plunger for closing or opening the oil filling hole is provided on the oil filling hole.

[0014] Preferably, an angle dial is provided on the end surface of the threaded ring away from the cylinder body, and a pointer is provided on the rocker arm, and the pointer indicates the angle of the blade through the angle dial.

[0015] Preferably, a first axial gap A is left between the rocker arm and the bushing, and a second axial gap B is left between the bushing and the blade root platform, and the following conditions are satisfied: 0.1≤A≤0.15, 0.05≤B≤0.25.

[0016] Preferably, two threaded rings are sleeved on the outer circumferential surface of one end of the bushing close to the outside of the cylinder body, the outer circumferential surface of the rocker arm protrudes from the outer circumferential surface of the bushing and a third gap C is left between the outer circumferential surface of the rocker arm and a fourth gap D is left between the two threaded rings, and the following conditions are satisfied: 1.5≤C≤2, 1.5≤D≤2.

[0017] The utility model also provides a method for installing the installation structure of the inlet adjustable blade as described above, which comprises the following steps in sequence:

[0018] Step 1, assemble the two threaded rings with the bushing, inject grease into the oil filling hole on the bushing, and fill the first oil storage tank with grease until it overflows; Step 2, put the bushing into the mounting hole on the cylinder body; Step 3, insert the blade root of the blade into the bushing from the inside of the cylinder body and arrange the second sealing ring between the outer peripheral surface of the blade root platform and the cylinder body, and use the second bolt to preliminarily connect and fix the rocker arm to the blade root; Step 4, use the first bolt to preliminarily connect and fix the two threaded rings to the cylinder body; Step 5, rotate the bushing to make the bushing contact with the blade root platform, and then rotate the bushing in the opposite direction until a second axial gap B is left between the bushing and the blade root platform; Step 6, adjust the threaded ring and the rocker arm, so that a first axial gap A is left between the rocker arm and the bushing, a third gap C is left between the rocker arm and a threaded ring close to the rocker arm, and a fourth gap D is left between the two threaded rings; Step 7, tighten the first bolt and the second bolt.

[0019] Compared with the prior art, the present invention has significant improvements:

[0020] During assembly, first inject grease into the oil filling hole on the bushing, fill the first oil storage tank with grease until it overflows, apply the overflowed grease to the inner peripheral side of the bushing, and then assemble the bushing with the mounting hole of the cylinder body and the blade root of the blade; during maintenance, grease can be added to the inner side of the bushing through the oil filling hole on the bushing. Therefore, the utility model can effectively increase the amount of lubricating oil, improve the lubrication effect, increase the effective lubrication time, and is easy to maintain and oil, so that the lubrication life can reach one overhaul cycle, and can effectively solve the problem of the rotation of the imported adjustable blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a longitudinal sectional schematic diagram of the installation structure of the inlet adjustable blades of the embodiment of the utility model.

[0022] Figure 2 It is a longitudinal section schematic diagram of the assembly of a rocker arm, a blade root, a bushing, a threaded ring and a cylinder body in the installation structure of an imported adjustable blade according to an embodiment of the utility model.

[0023] Figure 3 It is a longitudinal section schematic diagram of a bushing in the installation structure of the inlet adjustable blade of the embodiment of the utility model.

[0024] Figure 4 It is a longitudinal section schematic diagram of a half bearing in the installation structure of the imported adjustable blade in the embodiment of the utility model.

[0025] Figure 5 It is a schematic diagram of the assembly of a rocker arm, a blade root and a threaded ring in the installation structure of an inlet adjustable blade in an embodiment of the utility model.

[0026] The reference numerals are described as follows:

[0027] 1 blade

[0028] 100 Leaf

[0029] 101 Leaf Root

[0030] 102 Leaf Top

[0031] 2 Cylinder

[0032] 200 Mounting holes

[0033] 3 Inner ring

[0034] 4 Bushing

[0035] 400 First oil tank

[0036] 401 Straight Slot

[0037] 402 Annular groove

[0038] 410 Oil filling hole

[0039] 5 and a half bearings

[0040] 500 Second oil tank

[0041] 6 First sealing ring

[0042] 7 Threaded ring

[0043] 8 Rocker arm

[0044] 800 Avoidance hole

[0045] 9 First Bolt

[0046] 10 Second bolt

[0047] 11 Second sealing ring

[0048] 12 angle dial

[0049] 13 Pointer DETAILED DESCRIPTION

[0050] The following is a further detailed description of the specific implementations of the present invention in conjunction with the accompanying drawings. These implementations are only used to illustrate the present invention, but not to limit the present invention.

[0051] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In addition, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0054] like Figures 1 to 5 The figure shows an embodiment of the installation structure of the inlet adjustable blades provided by the utility model. The installation structure of the inlet adjustable blades of this embodiment can be used in a gas turbine unit, and is suitable for the inlet adjustable blades of a gas turbine compressor.

[0055] See also Figure 1 In the installation structure of the inlet adjustable blade of this embodiment, the blade 1 is arranged inside the cylinder body 2. The blade 1 has a blade body 100 and a blade root 101 and a blade top 102 respectively arranged at both ends of the blade body 100. The blade root 101 is in the shape of a long handle, and the blade root 101 is rotatably installed in the installation hole 200 on the cylinder body 2. The blade top 102 is installed on the inner ring 3 coaxially sleeved in the cylinder body 2. The blade top 102 and the inner ring 3 are rotatably matched, so that the blade 1 is kept between the cylinder body 2 and the inner ring 3, and the angle of the blade body 100 of the blade 1 can be rotatably adjusted.

[0056] See also Figures 1 to 3The mounting structure of the inlet adjustable blade of this embodiment includes a bushing 4, which is arranged between the blade root 101 of the blade 1 and the mounting hole 200 of the cylinder body 2, so that the blade root 101 does not directly contact the cylinder body 2 to reduce the contact friction when the blade root 101 rotates. In addition, a first oil storage tank 400 is provided on the inner peripheral side surface of the bushing 4 that matches the blade root 101, and an oil injection hole 410 is provided on the end surface of the bushing 4 close to the outside of the cylinder body 2, and the oil injection hole 410 is connected to the first oil storage tank 400. During assembly, grease can be first injected into the oil injection hole 410 on the bushing 4, so that the grease fills the first oil storage tank 400 until it overflows, and the overflowed grease is coated on the inner peripheral side surface of the bushing 4, and then the bushing 4 is assembled with the mounting hole 200 of the cylinder body 2 and the blade root 101 of the blade 1; during maintenance, grease can be added to the inner side of the bushing 4 through the oil injection hole 410 on the bushing 4. Therefore, the installation structure of the imported adjustable blades in this embodiment can effectively increase the amount of lubricating oil, improve the lubrication effect, increase the effective lubrication time, and is easy to maintain and oil, so that the lubrication life can reach one overhaul cycle, which can effectively solve the problem of jamming of the imported adjustable blades.

[0057] In this embodiment, preferably, the first oil storage groove 400 on the inner peripheral side of the bushing 4 includes a straight groove 401 extending along the axial direction of the bushing 4 and a plurality of annular grooves 402 extending along the circumferential direction of the bushing 4. The plurality of annular grooves 402 are distributed along the axial direction of the bushing 4 at intervals and are interconnected through the straight grooves 401. To increase the connection effect, a plurality of straight grooves 401 may also be provided, and the plurality of straight grooves 401 are distributed along the circumferential direction of the bushing 4 at intervals. The annular groove 402 closest to the oil injection hole 410 is connected to the oil injection hole 410. Thus, the grease injected from the oil injection hole 410 can gradually fill all the annular grooves 402 and the straight grooves 401 through the annular groove 402 closest to the oil injection hole 410 and the straight groove 401, that is, fill the first oil storage groove 400 until it overflows. The positions where the plurality of annular grooves 402 are distributed along the axial direction of the bushing 4 are not limited. Preferably, a plurality of annular grooves 402 are provided at least at both ends of the bushing 4.

[0058] See also Figure 1 and Figure 4The installation structure of the imported adjustable blade of the present embodiment further comprises a half-bearing 5, which is arranged between the blade tip 102 of the blade 1 and the inner ring 3, so that the blade tip 102 and the inner ring 3 can be rotated together. Preferably, a second oil storage tank 500 is provided on the inner circumference of the half-bearing 5 and the blade tip 102. During assembly, the second oil storage tank 500 on the half-bearing 5 can be filled with grease until it overflows, and the overflowing grease is coated on the inner circumference of the half-bearing 5, and then the half-bearing 5 is assembled with the inner ring 3 and the blade tip 102 of the blade 1, so that the lubrication effect of the assembly between the blade tip 102 of the blade 1 and the inner ring 3 can be enhanced, and the lubrication oil amount, lubrication effect and lubrication effective time of the installation structure of the imported adjustable blade of the present embodiment can be further increased, and the sticking of the blade 1 when rotating can be avoided.

[0059] In this embodiment, preferably, the second oil storage groove 500 on the inner circumferential surface of the half bearing 5 is in a ring shape extending along the circumferential direction of the half bearing 5. The number of the second oil storage grooves 500 is not limited, and one or more second oil storage grooves 500 may be provided.

[0060] In this embodiment, preferably, a blade tip platform embedded in the inner ring 3 is provided between the blade tip 102 of the blade 1 and the blade body 100, and a first sealing ring 6 is provided between the outer peripheral surface of the blade tip platform and the inner ring 3. The first sealing ring 6 is an O-ring that performs a sealing function.

[0061] See also Figure 1 and Figure 2The mounting structure of the inlet adjustable blade of this embodiment further includes a threaded ring 7 and a rocker arm 8. An internal thread is provided on the inner circumference of the threaded ring 7, and an external thread is provided on the outer circumference of one end of the bushing 4 close to the outside of the cylinder body 2 and extends out of the mounting hole 200. The external thread of the bushing 4 is matched with the internal thread of the threaded ring 7 to connect and fix the bushing 4 with the threaded ring 7. The threaded ring 7 is connected to the cylinder body 2 by a first bolt 9 to connect and fix the threaded ring 7 with the cylinder body 2, so that the bushing 4 can be fixed to the cylinder body 2. The blade root 101 of the blade 1 is rotatably penetrated in the bushing 4 from the inside of the cylinder body 2, and the rocker arm 8 is connected to the blade root 101 by a second bolt 10 outside the cylinder body 2 to connect and fix the rocker arm 8 with the blade root 101, so that the blade 1 can be driven to rotate by operating the rocker arm 8 outside the cylinder body 2 to adjust the angle of the blade 1. Preferably, the rocker arm 8 covers the bushing 4. Preferably, a keyway is provided on the end face of the blade root 101 away from the blade body 100, and a key is provided on the rocker arm 8. The key on the rocker arm 8 is engaged in the keyway on the blade root 101, and the rocker arm 8 is connected and fixed to the blade root 101 by a second bolt 10. Preferably, the rocker arm 8 and the second bolt 10 are fixed to prevent loosening, and the fixing method can be spot welding or set screw riveting or glue bonding. Preferably, a blade root platform embedded in the cylinder body 2 is provided between the blade root 101 of the blade 1 and the blade body 100, and a second sealing ring 11 is provided between the outer peripheral surface of the blade root platform and the cylinder body 2. The second sealing ring 11 is an O-ring and plays a sealing role. Preferably, a groove is provided on the outer peripheral surface of the blade root platform, and the second sealing ring 11 is embedded in the groove.

[0062] In one embodiment, the oil filling hole 410 on the bushing 4 may be equipped with a grease nipple, and during maintenance, grease may be directly injected into the grease nipple on the oil filling hole 410 through a grease gun. In another embodiment, the oil filling hole 410 on the bushing 4 may not be equipped with a grease nipple. In this case, see Figure 5 A avoidance hole 800 is provided on the rocker arm 8 at a position corresponding to the oil injection hole 410 to expose the oil injection hole 410. By design, when the rocker arm 8 is rotated and adjusted to the angle position where the blade 1 is in the working state, the avoidance hole 800 on the rocker arm 8 is aligned with the oil injection hole 410 on the bushing 4 to expose the oil injection hole 410. A plunger is provided on the oil injection hole 410 to close or open the oil injection hole 410. The oil injection hole 410 can be closed or opened by inserting or removing the plunger. In the maintenance process, the plunger can be removed and a needle-type oiling gun can be inserted into the oil injection hole 410 to inject grease. Preferably, the avoidance hole 800 is a waist-shaped hole extending along the rotation direction of the rocker arm 8.

[0063] See also Figure 5In the installation structure of the inlet adjustable blade of this embodiment, preferably, an angle dial 12 is provided on the end surface of the threaded ring 7 away from the cylinder body 2, and a pointer 13 is provided on the rocker arm 8. The pointer 13 rotates synchronously with the rocker arm 8 and the blade 1, and indicates the angle of the blade 1 through the angle dial 12, thereby realizing the visual measurement of the rotation angle of the blade 1.

[0064] See also Figure 1 and Figure 2 After the installation structure of the inlet adjustable blade of this embodiment is assembled, a first axial gap A is left between the rocker arm 8 and the bushing 4, and a second axial gap B is left between the bushing 4 and the blade root platform of the blade 1, and the following conditions are satisfied: 0.1≤A≤0.15, 0.05≤B≤0.25. For the gas turbine compressor, the maximum axial movement S value of the inlet adjustable blade is formed by the superposition of the dimensions and tolerances of the various assembly parts, and should satisfy: 0.15≤S≤0.4. If the S value is greater than the allowable range, the gap S1 between the blade body 100 of the blade 1 and the cylinder body 2 or the gap S2 between the blade body 100 of the blade 1 and the inner ring 3 will disappear, causing hard friction between the blade 1 and the cylinder body 2 or the inner ring 3, resulting in rotation jam. The first axial clearance A and the second axial clearance B are the clearances required to be adjusted so that the maximum axial movement S value meets the requirements, S=A+B. According to the maximum axial movement S value of the inlet adjustable blade, the first axial clearance A and the second axial clearance B are adjusted during assembly to meet: 0.1≤A≤0.15, 0.05≤B≤0.25, which can ensure that the maximum axial movement S value of the inlet adjustable blade meets the requirements. It is ensured that during the operation of the gas turbine unit, the requirements can be met under the effects of gravity and expansion deformation, reducing the risk of the blade 1 getting stuck when rotating, and ensuring the safe operation of the unit.

[0065] Furthermore, in this embodiment, two threaded rings 7 are sleeved on the outer circumference of the end of the bushing 4 close to the outside of the cylinder body 2, the outer circumference of the rocker arm 8 protrudes from the outer circumference of the bushing 4 and a third gap C is left between the outer circumference of the rocker arm 8 and a threaded ring 7 close to the rocker arm 8, and a fourth gap D is left between the two threaded rings 7, and the following conditions are satisfied: 1.5≤C≤2, 1.5≤D≤2. Thus, a flexible structure can be formed to prevent rotation jamming caused by hard collision and friction.

[0066] The installation structure of the imported adjustable blades of this embodiment can be obtained by making slight changes to the existing structure. The impact on the existing structure is only to replace the bushing 4, the half bearing 5, reprocess the rocker arm 8 and add accessories such as the angle dial 12 and the pointer 13. Therefore, the installation structure of the imported adjustable blades of this embodiment can be used in workshop processing and production, and can also be used to transform the in-service units, and the changes are very small. According to the installation structure of the imported adjustable blades of this embodiment, the in-service units are transformed, which can reduce risks and processing costs, and have certain economic benefits.

[0067] Based on the above-mentioned installation structure of the inlet adjustable blades, the embodiment of the utility model further provides an installation method of the above-mentioned installation structure of the inlet adjustable blades in this embodiment, and the installation method includes the following steps in sequence.

[0068] Step 1: Assemble the two threaded rings 7 with the bushing 4, inject grease into the oil filling hole 410 on the bushing 4, fill the first oil storage tank 400 with grease until it overflows, and coat the inner circumferential side of the bushing 4 with the overflowed grease.

[0069] Step 2: Place the bushing 4 into the mounting hole 200 on the cylinder body 2 , so that a threaded ring 7 on the bushing 4 contacts the outer surface of the cylinder body 2 .

[0070] Step 3: insert the blade root 101 of the blade 1 into the bushing 4 from the inside of the cylinder body 2 and arrange the second sealing ring 11 between the outer peripheral surface of the blade root platform and the cylinder body 2, and use the second bolt 10 to preliminarily connect and fix the rocker arm 8 and the blade root 101.

[0071] Step 4: Use the first bolt 9 to preliminarily connect and fix the two threaded rings 7 to the cylinder body 2.

[0072] Step 5, rotate the bushing 4 so that it moves toward the inside of the cylinder body 1 until the bushing 4 contacts the blade root platform, and then rotate the bushing 4 in the opposite direction until a second axial gap B is left between the bushing 4 and the blade root platform. Rotate the bushing 4 in the opposite direction by 1 / 8 of a turn to preliminarily ensure that the second axial gap B between the bushing 4 and the blade root platform satisfies: 0.05≤B≤0.25.

[0073] Step 6, adjust the threaded ring 7 and the rocker arm 8 so that there is a first axial gap A between the rocker arm 8 and the bushing 4, a third gap C between the rocker arm 8 and a threaded ring 7 close to the rocker arm 8, and a fourth gap D between two threaded rings 7, and each gap satisfies: 0.1≤A≤0.15, 1.5≤C≤2, 1.5≤D≤2.

[0074] Step 7: Tighten the first bolt 9 and the second bolt 10.

[0075] When the installation structure and installation method of the above-mentioned inlet adjustable blades of this embodiment are applied to the inlet adjustable blades of a gas turbine compressor, the installation method is specifically as follows: first, by repeating the above-mentioned steps 1 to 4 for multiple times, the multiple blades 1 of the compressor are preliminarily installed and fixed to the cylinder body 2 one by one; after all the blades 1 are installed, the second oil storage tank 500 on the half-bearing 5 is first filled with grease until it overflows, and the overflowing grease is coated on the inner circumferential surface of the half-bearing 5; then, the half-bearing 5 is installed in the inner ring 3; and then the inner ring 3 is installed to the blade tip 102 of the blade 1 through the half-bearing 5, and a first sealing ring 6 is arranged between the outer circumferential surface of the blade tip platform and the inner ring 3. Temporarily assemble the inner ring 3 so that the center plane of the cylinder body 2 and the center plane of the inner ring 3 are located in the same plane, and the cylinder body 2 and the inner ring 3 are centered; then, by repeating the above steps 5 and 6 for many times, first adjust the gaps of the mounting structure of the four blades 1 adjacent to the center plane of the cylinder body 2 and the two blades 1 located on the normal line of the center plane of the cylinder body 2, a total of six blades 1, one by one, and then adjust the gaps of the mounting structure of the remaining blades 1 one by one; after the gaps at all the blades 1 are adjusted, execute the above step 7, tighten all the first bolts 9 and the second bolts 10, and finally assemble the cylinder body 2 and the inner ring 3.

[0076] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. An installation structure for an inlet adjustable blade, wherein the blade (1) is arranged inside a cylinder (2), and the blade root (101) of the blade (1) is rotatably installed in a mounting hole (200) on the cylinder (2), characterized in that: The mounting structure comprises a bushing (4), wherein the bushing (4) is arranged between the blade root (101) and the mounting hole (200), and a first oil storage groove (400) is provided on the inner peripheral side surface of the bushing (4) matching with the blade root (101), and an oil filling hole (410) is provided on an end surface of the bushing (4) close to the outside of the cylinder body (2), and the oil filling hole (410) is connected to the first oil storage groove (400).

2. The installation structure of the inlet adjustable blade according to claim 1 is characterized in that: The first oil storage groove (400) includes a straight groove (401) extending along the axial direction of the bushing (4) and a plurality of annular grooves (402) extending along the circumference of the bushing (4); the plurality of annular grooves (402) are spaced apart along the axial direction of the bushing (4) and are interconnected through the straight grooves (401); the annular groove (402) closest to the oil injection hole (410) is connected to the oil injection hole (410).

3. The installation structure of the inlet adjustable blade according to claim 1 or 2, characterized in that: The blade tip (102) of the blade (1) is mounted on an inner ring (3) coaxially sleeved in the cylinder body (2), and the mounting structure also includes a half-bearing (5), the half-bearing (5) is arranged between the blade tip (102) and the inner ring (3), and a second oil storage groove (500) is provided on the inner circumferential surface of the half-bearing (5) matching with the blade tip (102).

4. The installation structure of the inlet adjustable blade according to claim 3 is characterized in that: A blade tip platform embedded in the inner ring (3) is provided between the blade tip (102) and the blade body (100) of the blade (1), and a first sealing ring (6) is provided between the outer peripheral surface of the blade tip platform and the inner ring (3).

5. The installation structure of the inlet adjustable blade according to claim 1 is characterized in that: It also includes a threaded ring (7) and a rocker arm (8), wherein the inner circumference of the threaded ring (7) is provided with an internal thread, the outer circumference of one end of the bushing (4) close to the outside of the cylinder body (2) is provided with an external thread and extends out of the mounting hole (200), the external thread is matched with the internal thread, the threaded ring (7) is connected to the cylinder body (2) by a first bolt (9), the blade root (101) is rotatably inserted into the bushing (4), the rocker arm (8) is connected to the blade root (101) by a second bolt (10) outside the cylinder body (2) and covers the bushing (4), a blade root platform embedded in the cylinder body (2) is provided between the blade root (101) and the blade body (100) of the blade (1), and a second sealing ring (11) is provided between the outer circumference of the blade root platform and the cylinder body (2).

6. The installation structure of the inlet adjustable blade according to claim 5 is characterized in that: A grease nipple is installed on the oil filling hole (410), or a avoidance hole (800) is opened on the rocker arm (8) at a position corresponding to the oil filling hole (410) to expose the oil filling hole (410), and a plunger is provided on the oil filling hole (410) to close or open the oil filling hole (410).

7. The installation structure of the inlet adjustable blade according to claim 5 is characterized in that: An angle dial (12) is provided on the end surface of the threaded ring (7) away from the cylinder body (2), and a pointer (13) is provided on the rocker arm (8). The pointer (13) indicates the angle of the blade (1) through the angle dial (12).

8. The installation structure of the inlet adjustable blade according to claim 5 is characterized in that: A first axial gap A is left between the rocker arm (8) and the bushing (4), and a second axial gap B is left between the bushing (4) and the blade root platform, and the following conditions are satisfied: 0.1≤A≤0.15, 0.05≤B≤0.

25.

9. The installation structure of the inlet adjustable blade according to claim 8, characterized in that: Two threaded rings (7) are sleeved on the outer peripheral surface of one end of the bushing (4) close to the outside of the cylinder body (2); the outer peripheral surface of the rocker arm (8) protrudes from the outer peripheral surface of the bushing (4) and a third gap C is left between the outer peripheral surface of the bushing (4) and a threaded ring (7) close to the rocker arm (8); a fourth gap D is left between the two threaded rings (7), and the following conditions are satisfied: 1.5≤C≤2, 1.5≤D≤2.

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