A rotor tip clearance measurement method and device

Abstract

The present invention belongs to the technical field of aircraft secondary power systems and discloses a rotor tip clearance measurement method and device. The method comprises the following steps: first, measuring the distance a between the outer ring surface of the inlet outer ring support and the end face of the inlet outer ring, as well as the height of the inlet outer ring end face on a plane, to obtain the distance c from the bottom surface of the inlet outer ring to the clearance design point; then, directly measuring the distance between the lower end face of the product's intake bearing end cover and the surface of the intake bearing end cover for assembling the L-shaped sealing gasket, and measuring the distance between the bottom of the inlet outer ring and the lower end face of the intake bearing end cover. The distance A between the clearance design point on the outer ring of the inlet duct and the surface of the intake bearing end cover for assembling the L-shaped gasket is calculated; the axial clearance f of the product bearing under preload is then measured; finally, by measuring the thickness h of the L-shaped gasket and the distance g between the clearance design point on the centrifugal impeller and the bottom of the bearing inner ring, the distance B between the clearance design point on the impeller and the end face of the L-shaped gasket is obtained, B = g + the theoretical distance between the end faces of the inner and outer rings of the bearing ‑f / 2 + h; the tip clearance C at the clearance design point on the centrifugal impeller is calculated as B‑A. Compared with existing measurement methods, the method of the present invention measures the tip clearance during product assembly, eliminating the need for repeated disassembly and assembly of the entire product and the need to transfer the product back and forth between measuring equipment. This improves product assembly efficiency and is more suitable for batch operations.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft secondary power systems and relates to a rotor measurement method, in particular to a rotor tip clearance measurement method and device. Background Art

[0002] The powertrain is the power generation portion of the Thermal / Power Management Unit (PTMU), primarily consisting of a compressor, turbine, combustor, and related accessories. During the assembly of these core components, controlling the tip clearance between the rotor blades and stator has a direct impact on the product's efficiency, performance, and stability.

[0003] The tip clearance between the rotor and stator of the PTMU power unit is primarily controlled by multiple adjustment shims. Before adjusting the tip clearance, the actual tip clearance must be measured. The adjustment shims are then reworked and adjusted based on the comparison between the measured value and the designed value. Clearance is typically measured directly using specialized measuring tools such as feeler gauges and wire gauges. However, due to the numerous components and complex structure of the power unit, direct tip clearance measurement during assembly is often impossible.

[0004] CN202111350602.6, CN202111225691.1, and CN201410357627.2 disclose different methods for measuring rotor tip clearance. The former adopts an optical measurement method, which requires the arrangement of a drive unit and a camera. This solution is relatively complicated and can only measure a single rotor tip clearance. Replacing the rotor requires rearrangement and fixing of points, and cannot be used in large quantities in industrial production; CN202111225691.1 adopts a grinding measurement method, which not only requires sticking wax blocks on the blades, but also running the rotor, and finally measuring the wear of the wax blocks. This method is time-consuming and labor-intensive, and cannot be used in large quantities in industrial production; CN201410357627.2 adopts an electrical signal measurement method, which requires the arrangement of sensors and other components, and then measurement on the instrument, and also cannot be used in large quantities in industrial production. Summary of the Invention

[0005] To address the inability to directly measure blade tip clearance during assembly and the inability of existing methods to be used in large-scale industrial production, the present invention provides a rotor tip clearance measurement method and device. These methods are used to calculate rotor tip clearance during assembly through indirect measurement, thereby determining the amount of shim rework and adjusting the clearance to meet design requirements. The method is rapid and accurate, making it suitable for adjustment in industrial mass production and assembly.

[0006] The technical solution of the present invention:

[0007] A method for measuring rotor blade tip clearance comprises the following steps:

[0008] S1: The distance c from the bottom surface of the inlet outer ring to the clearance design point is obtained by measuring the distance a between the outer ring surface of the inlet outer ring support and the end face of the inlet outer ring, as well as the height of the end face of the inlet outer ring on the plane.

[0009] S2: Directly measure the distance between the lower end face of the intake bearing end cover and the surface of the intake bearing end cover for mounting the L-shaped gasket, as well as the distance from the bottom of the intake duct outer ring to the lower end face of the intake bearing end cover. Calculate the distance A from the clearance design point on the intake duct outer ring to the surface of the intake bearing end cover for mounting the L-shaped gasket.

[0010] S3: Measure the axial clearance f of the product bearing under preload;

[0011] S4: Measure the thickness h of the L-shaped gasket and the distance g between the clearance design point on the centrifugal impeller and the bottom of the bearing inner ring; obtain the distance B between the clearance design point on the impeller and the end face of the L-shaped gasket, B = g + the theoretical distance between the end faces of the bearing inner ring and outer ring - f / 2 + h;

[0012] S5: Tip clearance C=BA at the clearance design point on the centrifugal impeller.

[0013] Furthermore, S1 is specifically as follows: install the product's air intake outer ring on the air intake outer ring support, measure the distance a between the outer ring surface of the air intake outer ring support and the end face of the air intake outer ring, then remove the air intake outer ring from the air intake outer ring support, place it on a plane, and measure the distance b between the plane and the end face of the air intake outer ring; the value of b minus a is the distance c from the bottom surface of the air intake outer ring to the clearance design point;

[0014] Furthermore, S2 is specifically as follows: measure the distance d between the lower end face of the product's intake bearing end cover and the surface of the intake bearing end cover for assembling the L-shaped sealing gasket, assemble the product's intake bearing end cover, intake air hood, and intake duct outer ring on the intake support unit, measure the distance e from the bottom of the intake duct outer ring to the lower end face of the intake bearing end cover, and obtain the distance A from the gap measurement point on the intake duct outer ring to the surface of the intake bearing end cover for assembling the L-shaped sealing gasket by subtracting d from e and c.

[0015] Furthermore, S3 is specifically as follows: assemble the product bearing, L-shaped sealing gasket, intake bearing end cover, intake air hood, and intake duct outer ring on the intake support unit, fasten the bearing with a bearing clamp, measure the distance between the bottom of the intake duct outer ring and the end face of the bearing mounting seat and record it as f1, then apply a preload force to the bearing clamp, measure the distance between the bottom of the intake duct outer ring and the end face of the bearing mounting seat and record it as f2, and the bearing axial clearance is recorded as f=2(f1-f2).

[0016] Furthermore, S4 is specifically as follows: measure the thickness h of the L-type sealing gasket; assemble the product rotor assembly, assemble the impeller fixture on the centrifugal impeller, and measure the distance between the clearance design point on the centrifugal impeller calibrated by the impeller fixture and the bottom of the bearing inner ring, which is recorded as g; by calculating g plus the theoretical distance between the end faces of the inner ring and the outer ring of the bearing minus half of the axial clearance f of the bearing plus the thickness h of the L-type sealing gasket, the distance B between the clearance design point on the impeller and the end face of the L-type sealing gasket is obtained.

[0017] A rotor tip clearance measuring device, used for the above-mentioned rotor tip clearance measuring method, includes an inlet outer ring support used in S1, the inlet outer ring support is a base structure with three circles of protruding circular rings, the innermost circular ring of the inlet outer ring support positions the inlet outer ring, the outer diameter of the circular ring of the second layer of the inlet outer ring support matches the clearance design point position of the inlet outer ring during actual product installation; the outermost circular ring of the inlet outer ring support is the same height as the circular ring of the second layer, and the radius of the outermost circular ring is larger than the radius of the inlet outer ring.

[0018] A rotor tip clearance measuring device, used for the above-mentioned rotor tip clearance measuring method, includes a bearing fixture used in S3, the bearing fixture includes an upper bearing mounting seat and a lower bearing mounting seat; the upper bearing mounting seat and the lower bearing mounting seat are respectively installed on the upper and lower sides of the product bearing to axially fix the inner ring of the product bearing, and the upper end of the upper bearing mounting seat extends out of the outer ring of the air inlet duct.

[0019] Furthermore, it also includes a bracket, a spring and a hexagonal nut with a flange; the lower bearing mounting seat has an external thread, and the middle of the bracket has a through hole. After the bracket passes through the lower bearing mounting seat through the through hole, it is tightened on the intake bearing end cover with a spring and a hexagonal nut with a flange, applying a preload force to the combination of the upper bearing mounting seat and the lower bearing mounting seat.

[0020] A rotor tip clearance measuring device, used in the above-mentioned rotor tip clearance measuring method, includes an impeller fixture used in S4, the impeller fixture includes a pressure ring and a positioning ring; the inner diameter of the pressure ring matches the clearance design point on the centrifugal impeller; the positioning ring is connected to the pressure ring from the bottom to fix the position of the pressure ring.

[0021] Furthermore, the system also includes a hexagonal bolt, a high-precision bolt. The pressure ring and locating ring are provided with U-shaped grooves. The hexagonal bolt connects to the locating ring from below, aligned with the U-shaped groove. The hexagonal bolt can be screwed from below to the lower surface of the pressure ring. By measuring the position of the top of the hexagonal bolt in the U-shaped groove, the position of the clearance design point on the centrifugal impeller where the pressure ring is positioned can be measured. The measurement is performed by inserting the measuring instrument into the U-shaped groove.

[0022] Advantages of the present invention:

[0023] 1. Compared with existing rotor tip clearance measurement methods such as optical measurement methods, grinding measurement methods, and electrical signal measurement methods, the rotor tip clearance measurement method and device of the present invention are simple to operate and can measure the tip clearance during product assembly without the need to repeatedly disassemble and assemble the entire product. At the same time, there is no need to transfer the product back and forth between measuring equipment, which improves the assembly efficiency of the product and is more suitable for batch operations.

[0024] 2. Compared with the optical and electrical signal generating equipment required by the existing rotor tip clearance measurement method, the measuring device used in the rotor tip clearance measurement method of the present invention is simple to manufacture, and the measuring tools mainly use existing tools such as altimeters, depth gauges, and calipers. There is no need to purchase expensive measuring equipment or increase personnel training, which saves costs.

[0025] 3. In the rotor tip clearance measurement method and device of the present invention, the outer diameter of the middle circular ring of the inlet outer ring support and the inner diameter of the impeller clamp intermediate pressure ring are mainly matched with the clearance design points of the inlet outer ring and the centrifugal impeller. After multiple measurements, the inlet outer ring support and the impeller clamp intermediate pressure ring may have certain wear. Since the intermediate ring surface of the inlet outer ring support and the impeller clamp intermediate pressure ring have simple structures and their own thickness does not affect the measurement results, the worn surface can be processed off and continued to be used, so the equipment maintenance cost is low and the maintenance cycle is short. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 This is a simplified diagram of the blade tip clearance of the product of the present invention.

[0028] Figure 2 This is the assembly cross-sectional view and measurement diagram of the air intake outer ring support of the present invention.

[0029] Figure 3 This is a cross-sectional view and measurement diagram of the outer ring of the air intake duct of the present invention.

[0030] Figure 4 This is a simplified diagram of the gap design point on the outer ring of the air intake duct to the measurement reference size of the present invention.

[0031] Figure 5 This is the assembly cross-sectional view and measurement diagram of the bearing fixture of the present invention.

[0032] Figure 6 This is a simplified diagram of the assembly of the impeller fixture and impeller of the present invention.

[0033] Figure 7 This is a cross-sectional view of the impeller fixture and product assembly and a simplified measurement diagram of the present invention.

[0034] Among them, 1—bearing upper mounting seat, 2—bearing lower mounting seat, 3—bracket, 4—spring, 5—hexagonal nut with flange, 6—nut, 7—bolt, 8—pressure ring, 9—locating ring, 10—hexagonal head bolt; 11—inlet duct outer ring, 12—centrifugal impeller, 13—inlet duct outer ring base, 14—platform, 15—inlet support unit, 16—inlet bearing end cover, 17—inlet air hood, 18—bearing, 19—sealing gasket. DETAILED DESCRIPTION

[0035] This section is an embodiment of the present invention, which is used to explain and illustrate the technical solution of the present invention. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships for the purposes of the accompanying drawings, and are intended only to facilitate the description of the present invention and simplify the description, rather than to indicate or imply that the device or case referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first", "second" and the like are used for descriptive purposes only, and should not be understood as indicating or implying relative importance or implying the number of technical features indicated. Thus, features defined as "first", "second" and the like may explicitly or implicitly include more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they may refer to fixed, detachable, or integrated connections; mechanical or point connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0038] Example 1:

[0039] A method for measuring rotor blade tip clearance comprises the following steps:

[0040] S1: The distance c from the bottom surface of the inlet outer ring to the clearance design point is obtained by measuring the distance a between the outer ring surface of the inlet outer ring support and the end face of the inlet outer ring, as well as the height of the end face of the inlet outer ring on the plane.

[0041] S2: Directly measure the distance between the lower end face of the intake bearing end cover and the surface of the intake bearing end cover for mounting the L-shaped gasket, as well as the distance from the bottom of the intake duct outer ring to the lower end face of the intake bearing end cover. Calculate the distance A from the clearance design point on the intake duct outer ring to the surface of the intake bearing end cover for mounting the L-shaped gasket.

[0042] S3: Measure the axial clearance f of the product bearing under preload;

[0043] S4: Measure the thickness h of the L-shaped gasket and the distance g between the clearance design point on the centrifugal impeller and the bottom of the bearing inner ring; obtain the distance B between the clearance design point on the impeller and the end face of the L-shaped gasket, B = g + the theoretical distance between the end faces of the bearing inner ring and outer ring - f / 2 + h;

[0044] S5: Tip clearance C=BA at the clearance design point on the centrifugal impeller.

[0045] S1 is as follows: Install the product's air intake outer ring on the air intake outer ring support, measure the distance a between the outer ring surface of the air intake outer ring support and the end face of the air intake outer ring, then remove the air intake outer ring from the air intake outer ring support, place it on a flat surface, and measure the distance b between the flat surface and the end face of the air intake outer ring; the value of b minus a is the distance c from the bottom surface of the air intake outer ring to the clearance design point;

[0046] S2 is specifically as follows: measure the distance d between the lower end face of the product's intake bearing end cover and the surface of the intake bearing end cover used to assemble the L-shaped sealing gasket, assemble the product's intake bearing end cover, intake air hood, and intake duct outer ring on the intake support unit, measure the distance e from the bottom of the intake duct outer ring to the lower end face of the intake bearing end cover, and obtain the distance A from the gap measurement point on the intake duct outer ring to the surface of the intake bearing end cover used to assemble the L-shaped sealing gasket by subtracting d from e and c.

[0047] S3 is specifically as follows: Assemble the product bearing, L-shaped sealing gasket, intake bearing end cover, intake air hood, and intake duct outer ring on the intake support unit, tighten the bearing with a bearing clamp, measure the distance between the bottom of the intake duct outer ring and the end face of the bearing mounting seat and record it as f1, then apply a preload force to the bearing clamp, measure the distance between the bottom of the intake duct outer ring and the end face of the bearing mounting seat and record it as f2, then the bearing axial clearance is recorded as f=2(f1-f2).

[0048] S4 is specifically as follows: measure the thickness h of the L-type sealing gasket; assemble the product rotor assembly, assemble the impeller fixture on the centrifugal impeller, and measure the distance between the clearance design point on the centrifugal impeller calibrated by the impeller fixture and the bottom of the bearing inner ring, recorded as g; by calculating g plus the theoretical distance between the end faces of the bearing inner ring and the outer ring minus half of the bearing axial clearance f and then adding the thickness h of the L-type sealing gasket, the distance B between the clearance design point on the impeller and the end face of the L-type sealing gasket is obtained.

[0049] A rotor tip clearance measuring device, used for the above-mentioned rotor tip clearance measuring method, includes an inlet outer ring support used in S1, the inlet outer ring support is a base structure with three circles of protruding circular rings, the innermost circular ring of the inlet outer ring support positions the inlet outer ring, the outer diameter of the circular ring of the second layer of the inlet outer ring support matches the clearance design point position of the inlet outer ring during actual product installation; the outermost circular ring of the inlet outer ring support is the same height as the circular ring of the second layer, and the radius of the outermost circular ring is larger than the radius of the inlet outer ring.

[0050] A rotor tip clearance measuring device, used for the above-mentioned rotor tip clearance measuring method, includes a bearing fixture used in S3, the bearing fixture includes an upper bearing mounting seat 1 and a lower bearing mounting seat 2; the upper bearing mounting seat 1 and the lower bearing mounting seat 2 are respectively installed on the upper and lower sides of the product bearing to axially fix the inner ring of the product bearing, and the upper end of the upper bearing mounting seat 1 extends out of the outer ring of the air inlet duct.

[0051] It also includes a bracket 3, a spring 4 and a hexagonal nut 5 with a flange; the bearing lower mounting seat 2 has an external thread, and the bracket 3 has a through hole in the middle. After the bracket 3 passes through the bearing lower mounting seat 2 through the through hole, it is tightened against the intake bearing end cover with the spring 4 and the hexagonal nut 5 with a flange, applying a preload force to the combination of the bearing upper mounting seat 1 and the bearing lower mounting seat 2.

[0052] A rotor tip clearance measuring device, used in the above-mentioned rotor tip clearance measuring method, includes an impeller fixture used in S4, the impeller fixture includes a pressure ring 8 and a positioning ring 9; the inner diameter of the pressure ring 8 matches the clearance design point on the centrifugal impeller; the positioning ring 9 is connected to the pressure ring 8 from the bottom to fix the position of the pressure ring 8.

[0053] The device also includes a hexagonal bolt 10, which is a high-precision bolt. U-shaped grooves are provided on the pressure ring 8 and the positioning ring 9. The hexagonal bolt 10 connects to the positioning ring 9 from the bottom of the positioning ring 9, aligned with the U-shaped groove. The hexagonal bolt 10 can be screwed from below to the lower surface of the pressure ring 8. By measuring the position of the top of the hexagonal bolt 10 in the U-shaped groove, the position of the clearance design point on the centrifugal impeller where the pressure ring 8 is located can be measured. When measuring, simply insert the measuring equipment into the U-shaped groove.

[0054] Example 2:

[0055] See Figure 1 The measurement point of the product tip clearance is set at 94mm from the center line of the Li Xin impeller and the outer ring of the inlet duct, and the design clearance is 0.3mm.

[0056] See Figure 2 First, install the air inlet outer ring on the air inlet outer ring base, and use a depth gauge to measure the distance between the end face of the air inlet outer ring and the end face of the air inlet outer ring base, which is recorded as a.

[0057] See Figure 3 , remove the air inlet outer ring from the air inlet outer ring base, place it on the platform, and use the depth gauge to measure the distance between the end face of the air inlet outer ring and the plane, which is recorded as b.

[0058] See Figure 4 First, measure the distance from the lower end face of the intake bearing end cover to the non-matching surface, denoted as d. Assemble the intake bearing end cover, intake hood, and intake duct outer ring on the intake support unit. Use a depth gauge to measure the distance from the bottom of the intake duct outer ring to the lower end face of the intake bearing end cover, denoted as e. By subtracting a from dimension b, we can find the distance from the bottom surface of the intake duct outer ring to the clearance design point, denoted as c. By subtracting e from d from c, we can find the distance from the clearance measurement point on the intake duct outer ring to the non-matching end face of the intake bearing end cover. This is denoted as A.

[0059] See Figure 5 , Assemble the product bearing, L-shaped sealing gasket, intake bearing end cover, intake air hood, and intake duct outer ring on the intake support unit, and use the bearing upper mounting seat 1 and bearing lower mounting seat 2 in the bearing fixture to tighten the bearing. Use the altimeter to measure the distance between the bottom of the intake duct outer ring and the end face of the bearing upper mounting seat 1, record it as f1, and then install the bracket 3, spring 4, and flanged hexagonal nut 5 in the bearing fixture, and tighten the flanged hexagonal nut 5 until the flange surface is against the bracket 3. At this time, the spring is used to apply preload force to the bearing, and the distance between the bottom of the intake duct outer ring and the end face of the bearing upper mounting seat 1 is measured, record it as f2, and the bearing axial clearance is recorded as f=2(f1-f2).

[0060] See Figure 6 、 Figure 7Measure the thickness of the L-shaped gasket, denoted as h. Assemble the rotor assembly. During assembly, first select three 1.5mm thick gaskets. Place the rotor assembly on the support. Place the pressure ring 8 on the impeller. Install the locating ring 9, ensuring the impeller fixture is horizontally positioned by fitting the locating ring against the flat surface at the bottom of the impeller. Connect the locating ring 9 to the pressure ring 8 using six bolts 7 and six nuts 6 to clamp the impeller. Install six hexagonal bolts 10 at the lower end of the locating ring 9, ensuring the bottom ends of the hexagonal bolts 10 rest against the lower end of the pressure ring 8. Use the height gauge probe through the grooves in the pressure ring 8 and locating ring 9 to measure the distance from the bottom end of the hexagonal bolts 10 to the lower end of the bearing inner ring. Take the average value, denoted as g. The distance from the impeller clearance design point to the end face of the L-shaped gasket is calculated by adding g to the nominal distance between the bearing inner and outer ring end faces, minus half of the bearing axial clearance, and then adding the L-shaped gasket thickness h. This is denoted as B.

[0061] By subtracting A from B, we can get the tip clearance at the design point, which is recorded as C. Comparing the C value with the design clearance of 0.3 mm, we can know the rework adjustment value of the adjustment pad.

[0062] The above description is merely a detailed description of specific embodiments of the present invention. Any unspecified portions are conventional techniques. However, the scope of the present invention is not limited thereto. Any changes or substitutions that can be readily conceived by a person skilled in the art within the technical scope disclosed in the present invention are intended to be encompassed within the scope of the present invention. The scope of the present invention shall be determined by the scope of the claims.

Claims

1. A rotor tip clearance measurement method, characterized in that: The following steps are involved: S1: The distance c from the bottom surface of the inlet outer ring to the clearance design point is obtained by measuring the distance a between the outer ring surface of the inlet outer ring support and the end face of the inlet outer ring, as well as the height of the end face of the inlet outer ring on the plane. S2: Directly measure the distance between the lower end face of the intake bearing end cover and the surface of the intake bearing end cover for mounting the L-shaped gasket, as well as the distance from the bottom of the intake duct outer ring to the lower end face of the intake bearing end cover. Calculate the distance A from the clearance design point on the intake duct outer ring to the surface of the intake bearing end cover for mounting the L-shaped gasket. S3: Measure the axial clearance f of the product bearing under preload; S4: Measure the thickness h of the L-shaped gasket and the distance g between the clearance design point on the centrifugal impeller and the bottom of the bearing inner ring; obtain the distance B between the clearance design point on the impeller and the end face of the L-shaped gasket, B = g + the theoretical distance between the end faces of the bearing inner ring and outer ring - f / 2 + h; S5: Tip clearance C=BA at the clearance design point on the centrifugal impeller.

2. The rotor tip clearance measurement method according to claim 1, characterized in that: S1 is specifically as follows: install the product's air intake outer ring on the air intake outer ring support, measure the distance a between the outer ring surface of the air intake outer ring support and the end face of the air intake outer ring, then remove the air intake outer ring from the air intake outer ring support, place it on a plane, and measure the distance b between the plane and the end face of the air intake outer ring; the value of b minus a is the distance c from the bottom surface of the air intake outer ring to the gap design point.

3. The rotor tip clearance measurement method according to claim 1, characterized in that: S2 is specifically as follows: measure the distance d between the lower end face of the product's intake bearing end cover and the surface of the intake bearing end cover used to assemble the L-shaped sealing gasket, assemble the product's intake bearing end cover, intake air hood, and intake duct outer ring on the intake support unit, measure the distance e from the bottom of the intake duct outer ring to the lower end face of the intake bearing end cover, and obtain the distance A from the gap measurement point on the intake duct outer ring to the surface of the intake bearing end cover used to assemble the L-shaped sealing gasket by subtracting d from e and c.

4. The rotor tip clearance measurement method according to claim 1, characterized in that: S3 is specifically as follows: Assemble the product bearing, L-shaped sealing gasket, intake bearing end cover, intake air hood, and intake duct outer ring on the intake support unit, tighten the bearing with a bearing clamp, measure the distance between the bottom of the intake duct outer ring and the end face of the bearing mounting seat and record it as f1, then apply a preload force to the bearing clamp, measure the distance between the bottom of the intake duct outer ring and the end face of the bearing mounting seat and record it as f2, then the bearing axial clearance is recorded as f=2(f1-f2).

5. The rotor tip clearance measurement method according to claim 1, characterized in that: S4 is specifically as follows: measure the thickness h of the L-type sealing gasket; assemble the product rotor assembly, assemble the impeller fixture on the centrifugal impeller, and measure the distance between the clearance design point on the centrifugal impeller calibrated by the impeller fixture and the bottom of the bearing inner ring, recorded as g; by calculating g plus the theoretical distance between the end faces of the bearing inner ring and the outer ring minus half of the bearing axial clearance f and then adding the thickness h of the L-type sealing gasket, the distance B between the clearance design point on the impeller and the end face of the L-type sealing gasket is obtained.

6. A rotor tip clearance measuring device, used in the rotor tip clearance measuring method according to claim 2, characterized in that: Including the air intake outer ring support used in S1, the air intake outer ring support is a base structure with three circles of protruding circular rings. The innermost circular ring of the air intake outer ring support positions the air intake outer ring. The outer diameter of the circular ring of the second layer of the air intake outer ring support matches the clearance design point position of the air intake outer ring during actual product installation; the outermost circular ring of the air intake outer ring support has the same height as the circular ring of the second layer, and the radius of the outermost circular ring is larger than the radius of the air intake outer ring.

7. A rotor tip clearance measuring device, used in a rotor tip clearance measuring method according to claim 4, characterized in that: The invention comprises a bearing fixture used in S3, wherein the bearing fixture comprises an upper bearing mounting seat (1) and a lower bearing mounting seat (2); the upper bearing mounting seat (1) and the lower bearing mounting seat (2) are respectively mounted on the upper and lower sides of the product bearing for axially fixing the inner ring of the product bearing, and the upper end of the upper bearing mounting seat (1) extends out of the outer ring of the air inlet duct.

8. The rotor tip clearance measuring device according to claim 7, characterized in that: The invention also includes a bracket (3), a spring (4) and a hexagonal nut with a flange (5); the lower bearing mounting seat (2) has an external thread, and the middle of the bracket (3) has a through hole. After the bracket (3) passes through the lower bearing mounting seat (2) through the through hole, the spring (4) and the hexagonal nut with a flange (5) are used to press against the intake bearing end cover, thereby applying a pre-tightening force to the assembly of the upper bearing mounting seat (1) and the lower bearing mounting seat (2).

9. A rotor tip clearance measuring device, used in the rotor tip clearance measuring method according to claim 5, characterized in that: The impeller clamp includes an impeller clamp used in S4, which includes a pressure ring (8) and a positioning ring (9); the inner diameter of the pressure ring (8) matches the clearance design point on the centrifugal impeller; and the positioning ring (9) is connected to the pressure ring (8) from the bottom of the pressure ring (8) to fix the position of the pressure ring (8).

10. The rotor tip clearance measuring device according to claim 9, characterized in that: The invention also includes a hexagonal head bolt (10), which is a high-precision bolt. The pressure ring (8) and the positioning ring (9) are provided with a U-shaped groove. The hexagonal head bolt (10) is connected to the positioning ring (9) from the position of the U-shaped groove below the positioning ring (9). The hexagonal head bolt (10) can be screwed from the bottom to the lower surface of the pressure ring (8).

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