Rotor blade tip clearance measuring method and device

Abstract

The invention belongs to the technical field of airplane two-power systems, and discloses a rotor blade tip clearance measuring method and device, and the method comprises the steps: firstly, measuring the distance a between the outer ring surface of an air inlet channel outer ring support and the end surface of an air inlet channel outer ring, and measuring the height of the end surface of the air inlet channel outer ring on a plane; then directly measuring the distance between the lower end surface of the air inlet bearing end cover of the product and the surface of the air inlet bearing end cover, which is used for assembling the L-shaped sealing gasket, and measuring the distance between the bottom of the air inlet outer ring and the lower end surface of the air inlet bearing end cover; calculating to obtain a distance A from a gap design point on the air inlet channel outer ring to a surface, used for assembling an L-shaped sealing gasket, of the air inlet bearing end cover; measuring the bearing axial clearance f of the product bearing under the pretightening force; measuring the thickness h of the L-shaped sealing gasket, and measuring the distance g from a gap design point on the centrifugal impeller to 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 sealing gasket is obtained, wherein B = g + the theoretical distance between the end faces of the inner ring and the outer ring of the bearing-f / 2 + h; and calculating the blade tip clearance C = B-A at the clearance design point on the centrifugal impeller. Compared with an existing measuring method, the method has the advantages that the blade tip clearance is measured in the product assembling process, the whole product does not need to be disassembled and assembled repeatedly, meanwhile, the product does not need to be transferred back and forth between measuring equipment, the product assembling efficiency is improved, and the method is more suitable for batch operation.

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 power module is the power generation part of the thermal / energy management unit (PTMU), which is mainly composed of the compressor, turbine, combustion chamber and related accessories. During the assembly process of its core components, the control of the tip clearance between the rotor blades and the stator has a direct impact on the efficiency, work capacity and stability of the product.

[0003] The tip clearance between the rotor and stator of the PTMU power assembly is mainly controlled by multiple adjustment pads. Before adjusting the tip clearance, the actual tip clearance of the product must be measured first, and the adjustment pads must be reworked and adjusted based on the comparison between the actual measured value and the design value. The clearance is generally measured directly using special measuring tools such as feeler gauges and wire gauges, but due to the large number of power assembly parts and complex structures, it is usually impossible to directly measure the tip clearance during the assembly process.

[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 requires 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 is performed on the instrument, and it also cannot be used in large quantities in industrial production. Summary of the invention

[0005] In order to solve the problem that the blade tip clearance cannot be directly measured during the assembly process and most of the existing methods for measuring the blade tip clearance cannot be used in large quantities in industrial production, the present invention provides a rotor blade tip clearance measurement method and device, which is used to calculate the rotor blade tip clearance by indirect measurement during the assembly process, thereby determining the gasket rework amount and adjusting the clearance to meet the design requirements. The method of the present invention is fast and accurate, and can be suitable for adjustment and use in industrial mass production assembly.

[0006] The technical solution of the present invention:

[0007] A rotor tip clearance measurement method 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 of the product and the surface of the intake bearing end cover for assembling the L-shaped gasket, and measure the distance from the bottom of the intake duct outer ring to the lower end face of the intake bearing end cover, and 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 assembling the L-shaped gasket;

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

[0011] S4: By measuring the thickness h of the L-type sealing gasket and the distance g between the clearance design point on the centrifugal impeller and the bottom of the inner ring of the bearing, the distance B between the clearance design point on the impeller and the end face of the L-type sealing gasket is obtained, where B=g+theoretical distance between the end faces of the inner ring and the outer ring of the bearing-f / 2+h;

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

[0013] Further, S1 is specifically as follows: install the air inlet outer ring of the product on the air inlet outer ring support, measure the distance a between the outer ring surface of the air inlet outer ring support and the end face of the air inlet outer ring, then remove the air inlet outer ring from the air inlet outer ring support, place it on a plane, and measure the distance b between the plane and the end face of the air inlet outer ring; the value of b minus a is the distance c from the bottom surface of the air inlet 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 e from d from c.

[0015] Furthermore, S3 is specifically as follows: assemble the product bearing, L-shaped sealing gasket, intake bearing end cover, intake hood, and intake duct outer ring on the intake support unit, fasten the bearing with a bearing clamp, measure the distance from the bottom of the intake duct outer ring to the end face of the bearing mounting seat as f1, then apply a preload force to the bearing clamp, measure the distance from the bottom of the intake duct outer ring to the end face of the bearing mounting seat 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 clamp on the centrifugal impeller, and measure the distance from the clearance design point on the centrifugal impeller calibrated by the impeller clamp to the bottom of the inner ring of the bearing, 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 from the clearance design point on the impeller to 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 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 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, and a preload force is applied to the combination of the upper bearing mounting seat and the lower bearing mounting seat.

[0020] A rotor tip clearance measuring device, used for 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 of the pressure ring to fix the position of the pressure ring.

[0021] Furthermore, it also includes a hexagonal bolt, which is a high-precision bolt. The pressure ring and the positioning ring are provided with a U-shaped groove. The hexagonal bolt is connected to the positioning ring from the position of the U-shaped groove below the positioning ring. The hexagonal bolt can be screwed from the bottom 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 located can be measured. When measuring, just insert the measuring equipment into the U-shaped groove.

[0022] Advantages of the present invention:

[0023] 1. Compared with the 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 the product assembly process 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 middle pressure ring of the impeller fixture 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 middle pressure ring of the impeller fixture may show certain wear. Since the middle ring surface of the inlet outer ring support and the middle pressure ring of the impeller fixture have simple structures and their own thickness does not affect the measurement results, the worn surface can be machined off and continued to be used, and 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 solution of the implementation method of the patent of the present invention, the following is a brief introduction to the drawings required for use in the implementation method. It should be understood that the following drawings only show certain embodiments of the patent 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 paying 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 It is an assembly cross-sectional view and a measurement diagram of the air inlet outer ring support of the present invention.

[0029] Figure 3 It is a cross-sectional view and measurement diagram of the outer ring of the air inlet 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 inlet duct of the present invention to the measurement reference dimension.

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

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

[0033] Figure 7 It is a cross-sectional view and a measurement diagram of the impeller fixture and product assembly 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 as given in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or case referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implying the number of technical features indicated. Thus, features defined as "first", "second", etc. 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 clearly specified and limited, the terms "installed", "connected" and "connected" should be interpreted in a broad sense, for example, it can be a fixed connection, a detachable connection or an integrated connection; it can be a mechanical connection or a point connection; it can be a direct connection or an indirect connection 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 by specific circumstances.

[0038] Embodiment 1:

[0039] A rotor tip clearance measurement method 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 of the product and the surface of the intake bearing end cover for assembling the L-shaped gasket, and measure the distance from the bottom of the intake duct outer ring to the lower end face of the intake bearing end cover, and 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 assembling the L-shaped gasket;

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

[0043] S4: By measuring the thickness h of the L-type sealing gasket and the distance g between the clearance design point on the centrifugal impeller and the bottom of the inner ring of the bearing, the distance B between the clearance design point on the impeller and the end face of the L-type sealing gasket is obtained, where B=g+theoretical distance between the end faces of the inner ring and the outer ring of the bearing-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 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;

[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 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 e from d from c.

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

[0048] S4 is 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 from the clearance design point on the centrifugal impeller calibrated by the impeller fixture to the bottom of the inner ring of the bearing, 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 from the clearance design point on the impeller to 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 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 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 inlet duct.

[0051] It also includes a bracket 3, a spring 4 and a hexagonal nut 5 with a flange; 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 5 with a flange are used to tighten on the intake bearing end cover, and a preload force is applied to the combination of the upper bearing mounting seat 1 and the lower bearing mounting seat 2.

[0052] A rotor tip clearance measuring device, used for 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 of the pressure ring 8 to fix the position of the pressure ring 8.

[0053] It also includes a hexagonal 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 bolt 10 is connected to the positioning ring 9 from the position of the U-shaped groove below the positioning ring 9. The hexagonal bolt 10 can be screwed from the bottom 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 positioned by the pressure ring 8 can be measured. When measuring, the measuring equipment can be inserted into the U-shaped groove.

[0054] Embodiment 2:

[0055] See also 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 also 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 outer ring of the air inlet outer ring base, which is recorded as a.

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

[0058] See also Figure 4 , first measure the distance between the lower end face of the intake bearing end cover and the non-matching surface, recorded as d. Assemble the intake bearing end cover, intake hood, and intake duct outer ring on the intake support unit, and 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, recorded as e. By calculating the dimension b minus a, the distance from the bottom surface of the intake duct outer ring to the clearance design point can be obtained, recorded as c. By calculating the value of e minus d minus c, 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 can be obtained. Recorded as A.

[0059] See also 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 fasten the bearing with the bearing upper mounting seat 1 and the bearing lower mounting seat 2 in the bearing fixture. 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 applies a preload force to the bearing, and measures 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 f2, and the bearing axial clearance is recorded as f=2(f1-f2).

[0060] See also Figure 6 , Figure 7, measure the thickness of the L-type gasket, recorded as h. Assemble the product rotor assembly. During the assembly process, first select 3 gaskets with a thickness of 1.5 mm. Place the rotor assembly on the support, place the pressure ring 8 on the centrifugal impeller, and then install the positioning ring 9. The positioning ring fits the bottom plane of the centrifugal impeller to ensure the horizontal positioning of the impeller fixture. The positioning ring 9 is connected to the pressure ring 8 through 6 bolts 7 and 6 nuts 6 to clamp the centrifugal impeller. Install 6 hexagonal bolts 10 at the lower end of the positioning ring 9, so that the bottom end of the hexagonal bolt 10 is against the lower end of the pressure ring 8. Use the height gauge probe to measure the distance from the bottom end of the hexagonal bolt 10 to the lower end of the inner ring of the bearing through the grooves on the pressure ring 8 and the positioning ring 9, and take the average value, recorded as g. By calculating g plus the nominal distance between the end faces of the inner ring and the outer ring of the bearing minus half of the axial clearance of the bearing and adding the thickness of the L-type gasket h, the distance from the clearance design point on the impeller to the end face of the L-type gasket can be obtained, recorded as B.

[0061] By calculating B minus A, the blade tip clearance at the design point can be obtained, which is recorded as C. By comparing the C value with the design clearance of 0.3 mm, the rework adjustment value of the adjustment pad can be obtained.

[0062] The above is only a specific embodiment of the present invention, and the present invention is described in detail. The unexplained part is a conventional technology. However, the protection scope of the present invention is not limited to this. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The protection scope of the present invention shall be based on the protection 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 of the product and the surface of the intake bearing end cover for assembling the L-shaped gasket, and measure the distance from the bottom of the intake duct outer ring to the lower end face of the intake bearing end cover, and 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 assembling the L-shaped gasket; S3: Measure the axial clearance f of the product bearing under preload; S4: By measuring the thickness h of the L-type sealing gasket and the distance g between the clearance design point on the centrifugal impeller and the bottom of the inner ring of the bearing, the distance B between the clearance design point on the impeller and the end face of the L-type sealing gasket is obtained, where B=g+theoretical distance between the end faces of the inner ring and the outer ring of the bearing-f / 2+h; S5: Tip clearance C=BA at the clearance design point on the centrifugal impeller.

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

4. The rotor tip clearance measurement method according to claim 1, characterized in that: S3 is as follows: Assemble the product bearing, L-shaped sealing gasket, intake bearing end cover, intake hood, and intake duct outer ring on the intake support unit, fasten the bearing with a bearing clamp, measure the distance from the bottom of the intake duct outer ring to the end face of the bearing mounting seat as f1, then apply a preload force to the bearing clamp, measure the distance from the bottom of the intake duct outer ring to the end face of the bearing mounting seat as f2, and 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 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 from the clearance design point on the centrifugal impeller calibrated by the impeller fixture to the bottom of the inner ring of the bearing, 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 from the clearance design point on the impeller to the end face of the L-type sealing gasket is obtained.

6. A rotor tip clearance measuring device, used in a rotor tip clearance measuring method as claimed in claim 2, characterized in that: Including the air inlet outer ring support used in S1, the air inlet outer ring support is a base structure with three circles of protruding circular rings, the innermost circular ring of the air inlet outer ring support positions the air inlet outer ring, the outer diameter of the circular ring of the second layer of the air inlet outer ring support matches the position of the clearance design point of the air inlet outer ring during actual product installation; the outermost circular ring of the air inlet 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 inlet outer ring.

7. A rotor tip clearance measuring device, used in a rotor tip clearance measuring method as claimed in claim 4, characterized in that: 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 mounted 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.

8. The rotor tip clearance measuring device according to claim 7, characterized in that: The invention also comprises a bracket (3), a spring (4) and a hexagonal nut with a flange (5); the lower bearing mounting seat (2) has an external thread, the middle of the bracket (3) has a through hole, and 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, so as to apply 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 a rotor tip clearance measuring method as claimed in claim 5, characterized in that: The impeller clamp includes an impeller clamp used in S4, and the impeller clamp 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 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 comprises a hexagonal head bolt (10), which is a high-precision bolt. The pressure ring (8) and the positioning ring (9) are provided with U-shaped grooves. 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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