A compressor stator ring circumferential limiting assembly and a circumferential gap measuring method

Abstract

The application discloses a compressor stator ring circumferential limiting assembly, which comprises a locking unit and a limiting unit. The locking unit is fastened on a compressor cylinder body. The locking unit is adjacent to the limiting unit to limit the radial displacement of the limiting unit. The limiting unit limits the circumferential gap of the stator ring. The circumferential limiting assembly further comprises a gap measuring unit. The gap measuring unit measures the circumferential gap between the limiting unit and the stator ring. The gap measuring unit comprises a first wedge and a second wedge. The first wedge and the second wedge are arranged at an angle and are arranged in the limiting unit. The second wedge can move along the circumferential direction of the stator ring. The first wedge moves under the pushing of the second wedge. The first wedge converts the displacement of the second wedge along the circumferential direction of the stator ring into the displacement along the radial direction of the stator ring. By measuring the radial displacement of the second wedge, the gap value between the limiting unit and the stator ring can be indirectly measured.

Description

Technical Field

[0001] The present invention relates to the field of heavy-duty gas turbines, and in particular to the circumferential limitation of a compressor stator ring. Background Art

[0002] During the assembly of stator rings, there are requirements for the circumferential clearance between the various ring segments. This clearance is controlled by circumferentially limiting each ring segment. In actual assembly, this circumferential limit function is typically achieved by inserting a pin into the stator ring groove. Existing technical solutions typically control the dimensions of the stator ring groove and the pin limiting portion to minimize the difference in size and clearance. During actual assembly, it is difficult to measure and confirm whether the stator ring groove is in close contact with the pin, and confirmation relies solely on on-site experience.

[0003] Although the existing technical solutions have certain engineering application experience, due to space limitations, it is impossible to directly observe and measure whether the pins are tightly attached to the stator ring grooves in the assembled state, and the actual state is unknown. As a result, the circumferential clearance values ​​of each stator ring segment measured after assembly are not necessarily accurate and are inconsistent with the design intent.

[0004] Patent CN115163209A discloses a circumferential limiting system for a blade assembly, including a blade assembly and a circumferential limiting structure. The blade assembly includes a plurality of circumferentially distributed blades, and the circumferential limiting structure is disposed in the circumferential gap between two adjacent blades in the blade assembly. When the blades in the blade assembly move circumferentially, the circumferential limiting structure contacts the blade retaining surface to reduce the contact stress between the blade and the circumferential limiting structure, thereby alleviating the strength requirements of the circumferential limiting structure. For similar stationary blade ring structures, the above scheme cannot directly observe and measure whether the circumferential limiting structure is in close contact with the stationary blade ring groove or the blade side, and the measurement of the circumferential gap value of the stationary blade ring segment or different stationary blade groups is also inaccurate.

[0005] In view of the above technical problems, the present invention is specially introduced. Summary of the Invention

[0006] The main purpose of the present invention is to provide a circumferential limit assembly for a compressor stator ring, which can determine whether the limit assembly is tightly attached to the stator ring groove, thereby ensuring the measurement accuracy of the circumferential clearance value of each stator ring segment.

[0007] In order to achieve the above-mentioned objectives, the present invention provides a circumferential limit assembly for a compressor stator ring, wherein the compressor is provided with a positioning hole, the stator ring includes different ring segments, each ring segment is provided with a circumferential groove, the circumferential limit assembly includes a locking unit and a limit unit, the limit unit is arranged between the positioning hole and the circumferential groove, the locking unit is fixed in the positioning hole, and the locking unit is adjacent to the limit unit to limit the radial displacement of the limit unit; the circumferential limit assembly also includes a gap measuring unit, the gap measuring unit measures whether the limit unit and the circumferential groove are tightly attached to ensure that the circumferential gap between each ring segment can be accurately measured; the gap measuring unit includes a first wedge bar and a second wedge bar, the first wedge bar and the second wedge bar are arranged in the limiting unit, and the first wedge bar and the second wedge bar are arranged at an angle; the first wedge bar can move along the circumferential direction of the stator ring, and the first wedge bar moves under the push of the second wedge bar, and the second wedge bar converts the displacement of the first wedge bar along the circumferential direction of the stator ring into displacement along the radial direction of the stator ring. A circumferential limit assembly is installed inside the limit unit. By measuring the radial displacement of the second wedge strip, the circumferential clearance between the limit unit and the stator ring can be indirectly measured to determine whether the circumferential groove and the limit unit are in close contact.

[0008] The following is a further optimization of the above scheme by the present invention:

[0009] Furthermore, the first wedge strip includes a first wedge surface, the second wedge strip includes a second wedge surface, the first wedge surface and the second wedge surface are in contact with each other, and the second wedge strip transmits displacement through the interaction between the second wedge surface and the first wedge surface.

[0010] Furthermore, the second wedge-shaped surface has a second inclination angle, the first wedge-shaped surface has a first inclination angle, and the second inclination angle is equal to the first inclination angle.

[0011] Furthermore, the first wedge-shaped strip and the second wedge-shaped strip are arranged vertically.

[0012] Furthermore, the limiting unit includes a guide portion and a limiting portion, the guide portion passes through the compressor cylinder body, the guide portion has a top surface, and the top surface is adjacent to the locking unit; the limiting portion is inserted into the circumferential groove, the limiting portion includes a limiting surface, and the limiting surface can be tightly attached to the circumferential groove.

[0013] Furthermore, the limiting unit further includes a positioning portion, which is arranged on the guide portion, and the positioning portion makes the limiting surface parallel to the opening direction of the circumferential groove.

[0014] Furthermore, the limiting unit is provided with an L-shaped groove, which includes a first notch and a second notch. The second notch is provided on the limiting surface adjacent to the circumferential groove, and the first notch is provided on the top surface of the guide portion.

[0015] Furthermore, the first wedge-shaped strip passes through the first notch, the second wedge-shaped strip passes through the second notch, and the first wedge-shaped surface and the second wedge-shaped surface are in contact with each other.

[0016] Furthermore, the locking unit adopts thread locking.

[0017] According to another aspect of the present invention, a method for measuring the circumferential clearance of a compressor stator ring is provided, using any of the above-mentioned circumferential limit assemblies, comprising the following steps:

[0018] Assembling step S1: insert the first wedge strip through the first notch and the second wedge strip through the second notch, with the first wedge surface and the second wedge surface in contact with each other;

[0019] In step S2, the second wedge strip is pushed toward the first wedge surface until it stops moving. The distance A1 between the second wedge strip and the top surface of the guide portion is recorded. At this time, the distance B that the first wedge strip extends beyond the first limit surface is recorded.

[0020] Installation step S3: Slide the gap measurement unit and the limit unit assembled in step S1 into the positioning hole of the compressor cylinder, insert them between the positioning hole and the circumferential groove, and slide the positioning part along the guide groove of the positioning hole to ensure that the limit surface is parallel to the opening direction of the circumferential groove;

[0021] In the close contact determination step S4, the stator ring is rotated circumferentially so that the circumferential groove and the extended portion of the second wedge strip are in close contact with each other and the movement is continued until the circumferential groove is in close contact with the limit surface. At this time, the distance A2 between the first wedge strip and the top surface of the guide portion is recorded. The difference between the distance A2 measured in this step and the distance A1 measured in the extension distance confirmation step S2 is C = A2 - A1. By determining the relationship between B and C, it is determined whether the positioning portion and the circumferential groove are in close contact with each other.

[0022] In a radial limiting step S5, if it is determined in the close contact determination step S4 that the positioning portion is in close contact with the circumferential groove, the second wedge strip is removed and the locking unit is tightened;

[0023] In the circumferential clearance measurement step S6, the circumferential clearance between the ring segments is measured.

[0024] The application of the technical solution of the present invention achieves at least the following beneficial effects:

[0025] 1. Install a circumferential limit assembly inside the limit unit. By measuring the radial displacement of the second wedge strip, the gap between the limit unit and the circumferential groove can be indirectly measured to determine whether the circumferential groove and the limit unit are in close contact.

[0026] 2. The present invention utilizes two wedge-shaped surfaces to convert the measurement of the unmeasurable gap value into the measurement of the measurable radial height difference, thereby ensuring that the actual tightness between the stator ring groove and the positioning pin can be simulated during the assembly stage to accurately measure the circumferential gap between the stator ring segments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 A front view of the stationary blade ring is shown;

[0029] Figure 2 An axonometric view of the stator ring is shown;

[0030] Figure 3 The figure shows the state of the circumferential limiting assembly before limiting;

[0031] Figure 4 A partial enlarged view of the circumferential limit assembly before limiting is shown;

[0032] Figure 5 Shows the state of the circumferential limit assembly after limiting;

[0033] Figure 6 A schematic diagram of the first state assembly of the locking unit, the first wedge strip, and the second wedge strip is shown;

[0034] Figure 7 A schematic diagram of the second state assembly of the locking unit, the first wedge strip, and the second wedge strip is shown;

[0035] Figure 8 shows a schematic diagram of the axonometric view of the limit unit;

[0036] Figure 9 A cross-sectional view of the limiting unit is shown;

[0037] Figure 10 Shows a front view of the limit unit;

[0038] Figure 11 shows an axonometric view of the limit unit;

[0039] Figure 12 shows a top view of the limiting unit;

[0040] Figure 13 An axonometric view of a first wedge strip is shown;

[0041] Figure 14 An axonometric view of a second wedge strip is shown;

[0042] Figure 15 shows an axonometric view of the locking unit;

[0043] Figure 16 A flow chart showing a method for measuring the circumferential clearance of a stationary blade ring is shown.

[0044] The above drawings include the following reference numerals:

[0045] 1. First wedge strip; 2. Second wedge strip; 3. First wedge surface; 4. Second wedge surface; 5. Stationary blade ring; 6. Locking unit; 7. Limiting unit; 8. First notch; 9. Second notch; 10. Circumferential groove; 11. L-shaped groove; 12. Side surface of stationary blade ring; 13. Compressor cylinder; 14. Positioning hole;

[0046] 71. Guide portion; 72. Limiting portion; 73. Top surface; 74. Limiting surface; 75. Positioning portion; 76. First plane; 77. Second plane;

[0047] A, circumferential gap; A1, distance between the second wedge strip and the top surface of the guide portion in the first state; B, length of the protruding portion; A2, distance between the second wedge strip and the top surface of the guide portion in the second state. DETAILED DESCRIPTION

[0048] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0049] The present invention is described in further detail below with reference to specific embodiments. These embodiments are not to be construed as limiting the scope of protection claimed by the present invention. The term "including" when used indicates the presence of a feature, but does not exclude the presence or addition of one or more other features; the terms "lateral", "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for ease of description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be construed as limiting the present invention; in addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance.

[0050] In this description, it should be noted that, unless otherwise specified or limited, the terms "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention. Furthermore, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0051] The compressor blades of a gas turbine include a row of moving blades and a row of stationary blades. The stationary blade rows are usually installed in sections into the stationary blade ring 5, and then installed into the cylinder through the stationary blade ring 5. Figure 1-Figure 2 During the assembly of the stator ring 5, there are typically requirements for the circumferential clearance A between the stator ring side surfaces 12 between each ring segment. Excessive clearance between the stator ring side surfaces 12 can affect the gas turbine's aerodynamic performance; too small a clearance between the stator ring side surfaces 12 can generate significant stress during gas turbine operation due to thermal expansion. Therefore, it is important to ensure that the circumferential clearance A between the stator ring segments measured in the assembled state is consistent with the actual circumferential clearance value during operation, ensuring that the clearance between the stator ring side surfaces 12 is maintained at a reasonable level.

[0052] During assembly, when measuring the circumferential clearance A between each ring segment, it is necessary to ensure that the circumferential groove 10 is in close contact with the stopper 7. This ensures that the circumferential clearance value A measured in the assembled state is consistent with the circumferential clearance value in the actual operating state, consistent with the design intent. The circumferential stopper assembly of the present invention ensures accurate measurement of the circumferential clearance A between each stator ring segment in the assembled state.

[0053] like Figure 3-Figure 5 As shown, the compressor cylinder 13 of the compressor is provided with a positioning hole 14, and the stator ring includes different ring segments, each of which is provided with a circumferential groove 10. The circumferential limit assembly of the compressor stator ring 5 includes a locking unit 6 and a limit unit 7. The limit unit 7 is arranged between the positioning hole 14 and the circumferential groove 10, connecting the compressor cylinder and the ring segment of the stator ring. The locking unit 6 is fixed in the positioning hole, and the locking unit 6 is adjacent to the limit unit 7 to limit the radial displacement of the limit unit 7. The limit unit 7 also limits the circumferential displacement of the stator ring segment. In order to measure the circumferential clearance value under actual working conditions, the circumferential limit assembly also includes a clearance measuring unit to measure whether the limit unit 7 and the circumferential groove 10 are tightly attached to ensure that the circumferential clearance A between the ring segments can be accurately measured. The clearance measuring unit includes a first wedge bar 1 and a second wedge bar 2. The first wedge bar 1 and the second wedge bar 2 are arranged in the limit unit 7, and the two are arranged at an angle. The first wedge strip 1 is movable along the circumferential direction of the stationary blade ring 5. This movement is driven by the second wedge strip 2, which converts the displacement of the first wedge strip 1 along the circumferential direction of the stationary blade ring 5 into displacement along the radial direction of the stationary blade ring 5. A circumferential limit assembly is installed within the limit unit 7. By measuring the radial displacement of the second wedge strip 2, the clearance between the limit unit 7 and the circumferential groove 10 can be indirectly measured to determine whether the circumferential groove 10 and the limit unit 7 are in close contact.

[0054] Figures 8-15 Schematic diagrams of the limiting unit 7, the first wedge strip 1, the second wedge strip 2, and the locking unit 6 are shown respectively.

[0055] Limiting unit 7 Figures 8-12As shown, it includes a guide portion 71 and a stopper 72. The guide portion 71 passes through the compressor cylinder 13 and has a top surface 73 and a stopper surface 74. The stopper 72 is inserted into the circumferential groove 10, and the locking unit 6 is mounted on its upper side. The top surface 73 of the guide portion 71 abuts the locking unit 6, and the stopper surface 74 can be in close contact with the circumferential groove 10.

[0056] The limiting unit 7 defines an L-shaped slot 11, which includes a first notch 8 and a second notch 9. The first notch 8 is located on a limiting surface 74 adjacent to the circumferential groove 10, while the second notch 9 is located on the top surface 73 of the guide portion 71. The first wedge strip 1 passes through the first notch 8, and the second wedge strip 2 passes through the second notch 9, with the first wedge surface 3 and the second wedge surface 4 in contact. The limiting unit 7 also includes a positioning portion 75, which is located on the guide portion 71 so that the limiting surface 74 is parallel to the opening direction of the circumferential groove 10.

[0057] Figure 13 、 Figure 14 The first wedge strip 1 and the second wedge strip 2 are shown. The first wedge strip 1 includes a first wedge surface 3, and the second wedge strip 2 includes a second wedge surface 4. The first wedge surface 3 and the second wedge surface 4 are in contact with each other, and the second wedge strip 2 transmits displacement through the interaction between the second wedge surface 4 and the first wedge surface 3. To ensure space for relative movement between the first wedge surface 3 and the second wedge surface 4, a first flat surface 76 and a second flat surface 77 are provided between the first wedge surface 3 and the second wedge surface 4, respectively.

[0058] The second wedge surface 4 has a second inclination angle, and the first wedge surface 3 has a first inclination angle, wherein the first inclination angle and the second inclination angle are complementary angles to each other, so as to ensure that the limiting unit 7 fits in the L-shaped groove 11. Figure 6-Figure 7 In the example given, the second inclination angle is equal to the first inclination angle.

[0059] The present invention utilizes two wedge-shaped surfaces to convert the unmeasurable gap into a measurable radial height difference, so as to ensure that the actual tightness of the circumferential groove 10 and the limit unit 7 can be simulated during the assembly stage, thereby ensuring accurate measurement of the circumferential gap A between each stationary blade ring segment.

[0060] like Figure 6-Figure 7 As shown, the first wedge strip 1 is inserted into the horizontal section of the L-shaped slot 11 of the limiting unit 7, with its first wedge surface 3 facing the center of the limiting unit 7 and toward one side of the guide portion 71 of the limiting unit 7. The second wedge strip 2 is arranged perpendicular to the first wedge strip 1. The second wedge strip 2 is inserted into the vertical slot of the limiting unit 7, so that the second wedge surface 4 is placed in contact with the first wedge surface 3. The cross-section of the L-shaped slot 11 can be a square slot.

[0061] The first wedge strip 1 moves under the push of the second wedge strip 2. The second wedge strip 2 converts the displacement of the first wedge strip 1 along the circumferential direction of the stationary blade ring 5 into displacement along the radial direction of the stationary blade ring 5. This converts the clearance value between the stop surface 74 and the circumferential groove 10, which is difficult to measure in the assembled state, into a conveniently measurable radial position value along the stationary blade ring, thereby accurately determining whether the stop surface 74 and the circumferential groove 10 are in close contact.

[0062] Figure 6-Figure 7 Schematic diagrams of the first and second state assembly of the locking unit 6 with the first wedge strip 1 and the second wedge strip 2 are shown respectively.

[0063] In the first state, the second wedge strip 2 is pushed toward the first wedge surface 3 to a position where it cannot move. At this time, the first wedge strip 1 extends out of the square groove of the locking unit 6, and the length of the extended part is B. At this time, the distance A1 between the second wedge strip 2 and the top surface 73 of the guide portion 71 is recorded.

[0064] The assembled limiting unit 7, the first wedge strip 1 and the second wedge strip 2 are installed into the positioning hole 14 of the compressor cylinder, and the positioning portion 75 of the limiting unit 7 slides along the guide groove of the positioning hole of the compressor cylinder to ensure that the limiting surface 74 of the limiting unit 7 is placed along the circumferential direction. At this time, the limiting portion 72 of the limiting unit 7 is already located in the circumferential groove 10 of the stationary blade ring 5.

[0065] Rotate the stationary blade ring 5 in the circumferential direction, make one side of the circumferential groove 10 close to the extended part of the first wedge strip 1 and continue to move until one side of the circumferential groove 10 is close to the limiting surface 74 of the limiting unit 7. This state is Figure 7 The second state is shown. At this time, the distance A2 between the first wedge strip 1 and the top surface 73 of the guide portion 71 is recorded.

[0066] Assuming the difference between the values ​​of A1 and A2 is C, the criterion for tight contact is determined by the relationship between the C and B values. When the wedge surfaces of the first wedge strip 1 and the second wedge strip 2 are both at 45°, the C value should equal the B value. In other words, when the C and B values ​​are equal, the circumferential groove 10 is considered to be in tight contact with the stop element 7. When the circumferential groove 10 of each ring segment is in tight contact with the stop element 7, the circumferential clearance A between the various ring segments of the stator ring 5 can be accurately measured. If the stop surface 74 is not in tight contact with the circumferential groove 10, the stator ring segments can be adjusted to achieve tight contact.

[0067] When the circumferential groove 10 is tightly attached to the locking unit 6, the second wedge strip 2 is removed and the locking unit 6 is radially screwed into the positioning hole of the compressor cylinder, with the lower end surface tightly attached to the top surface 73 of the locking unit 6 to achieve radial limiting.

[0068] Figure 15A schematic diagram of the locking unit 6 is shown. The locking unit 6 shown in the figure is a large screw structure, which is thread-locked with the positioning hole of the compressor cylinder.

[0069] The method for measuring the circumferential clearance of the compressor stator ring 5 using the circumferential limit assembly is as follows Figure 16 As shown, the following steps are included:

[0070] Assembly step S1: insert the first wedge strip 1 through the first notch 8, and the second wedge strip 2 through the second notch 9, with the first wedge surface 3 and the second wedge surface 4 abutting each other, thereby completing the assembly of the gap measurement unit and the limit unit 7;

[0071] In step S2 , the second wedge strip 2 is pushed toward the first wedge surface 3 until it stops moving. The distance A1 between the second wedge strip 2 and the top surface 73 of the guide portion 71 is recorded. The distance B between the first wedge strip 1 and the first limiting surface 74 is recorded.

[0072] Installation step S2, slide the gap measuring unit and the limit unit 7 assembled in the assembly step S1 into the positioning hole 14 of the compressor cylinder, penetrate between the positioning hole 14 and the circumferential groove 10, and slide the positioning portion 75 along the guide groove of the positioning hole 14 to ensure that the limit surface 74 is parallel to the opening direction of the circumferential groove 10.

[0073] In the close contact determination step S4, the stator ring 5 is rotated circumferentially until the circumferential groove 10 and the extended portion of the second wedge strip 2 are in close contact. The movement is continued until the circumferential groove 10 is in close contact with the stop surface 74. At this point, the distance A2 between the first wedge strip 1 and the top surface 73 of the guide portion 71 is recorded. The difference between the distance A2 measured in this step and the distance A1 measured in the extended distance confirmation step S2 is calculated as C = A2 - A1. By determining the relationship between B and C, it is determined whether the positioning portion 75 and the circumferential groove 10 are in close contact.

[0074] In a radial limiting step S5, if it is determined in the close contact determination step S4 that the positioning portion 75 is in close contact with the circumferential groove 10, the locking unit 6 is tightened;

[0075] In the circumferential clearance measurement step S6, the circumferential clearance between the ring segments is measured.

[0076] In summary, from the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0077] 1. Install a circumferential limit assembly inside the limit unit 7. By measuring the radial displacement of the second wedge strip 2, the gap between the limit unit 7 and the circumferential groove 10 can be indirectly measured to determine whether the circumferential groove 10 and the limit unit 7 are in close contact.

[0078] 2. The present invention utilizes two wedge-shaped surfaces to convert the unmeasurable circumferential clearance into a measurable radial height difference, thereby ensuring that the actual tightness of the circumferential groove and the limit unit can be simulated during the assembly stage, and the circumferential clearance A between the various ring segments of the stationary blade ring can be accurately measured.

[0079] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A compressor stator ring circumferential limit assembly, wherein the compressor is provided with a positioning hole (14), the stator ring (5) comprises a plurality of ring segments, each of the ring segments is provided with a circumferential groove (10), the circumferential limit assembly comprises a locking unit (6) and a limit unit (7), the limit unit (7) is arranged between the positioning hole (14) and the circumferential groove (10), the locking unit (6) is fixed in the positioning hole (14), and the locking unit (6) is adjacent to the limit unit (7) to limit the radial displacement of the limit unit (7), Its characteristics are: The circumferential limit assembly further includes a gap measuring unit, which measures whether the limit unit (7) and the circumferential groove (10) are in close contact with each other, so as to ensure that the circumferential gap between the ring segments can be accurately measured; The gap measurement unit comprises a first wedge-shaped strip (1) and a second wedge-shaped strip (2), wherein the first wedge-shaped strip (1) and the second wedge-shaped strip (2) are inserted into the limiting unit (7), and the first wedge-shaped strip (1) and the second wedge-shaped strip (2) are arranged at an angle; The first wedge strip (1) can move along the circumferential direction of the stationary blade ring (5), and the first wedge strip (1) moves under the push of the second wedge strip (2), and the second wedge strip (2) converts the displacement of the first wedge strip (1) along the circumferential direction of the stationary blade ring (5) into a displacement along the radial direction of the stationary blade ring (5).

2. The circumferential limit assembly according to claim 1, characterized in that: The first wedge strip (1) includes a first wedge surface (3), the second wedge strip (2) includes a second wedge surface (4), the first wedge surface (3) and the second wedge surface (4) are in contact with each other, and the second wedge strip (2) transmits displacement through the interaction between the second wedge surface (4) and the first wedge surface (3).

3. The circumferential limit assembly according to claim 2, characterized in that: The second wedge-shaped surface (4) has a second inclination angle, the first wedge-shaped surface (3) has a first inclination angle, and the second inclination angle is equal to the first inclination angle.

4. The circumferential limit assembly according to claim 3, characterized in that: The first wedge-shaped strip (1) and the second wedge-shaped strip (2) are arranged vertically.

5. The circumferential limit assembly according to claim 4, characterized in that: The limiting unit (7) comprises a guide portion (71) and a limiting portion (72), wherein the guide portion (71) passes through the cylinder of the compressor, and the guide portion (71) has a top surface (73), and the top surface (73) is adjacent to the locking unit (6); The limiting portion (72) is inserted into the circumferential groove (10), and the limiting portion (72) includes a limiting surface (74), and the limiting surface (74) can be in close contact with the circumferential groove (10).

6. The circumferential limit assembly according to claim 5, characterized in that: The limiting unit (7) further includes a positioning portion (75), wherein the positioning portion (75) is provided on the guide portion (71), and the positioning portion (75) makes the limiting surface (74) parallel to the opening direction of the circumferential groove (10).

7. The circumferential limit assembly according to claim 6, characterized in that: The limiting unit (7) is provided with an L-shaped groove (11), and the L-shaped groove (11) includes a first groove (8) and a second groove (9), wherein the second groove (9) is provided on a limiting surface (74) adjacent to the circumferential groove (10), and the first groove (8) is provided on the top surface (73) of the guide portion (71).

8. The circumferential limit assembly according to claim 7, characterized in that: The first wedge strip (1) is inserted from the first notch (8), the second wedge strip (2) is inserted from the second notch (9), and the first wedge surface (3) and the second wedge surface (4) are in contact with each other.

9. The circumferential limit assembly according to claim 8, characterized in that: The locking unit (6) adopts thread locking.

10. A method for measuring the circumferential clearance of a compressor stator ring, characterized by: Using the circumferential limit assembly according to any one of claims 7 to 9 comprises the following steps: Assembling step S1, assembling the gap measuring unit and the limiting unit (7), inserting the first wedge strip (1) from the first notch (8), inserting the second wedge strip (2) from the second notch (9), and making the first wedge surface (3) and the second wedge surface (4) abut each other; In step S2 of confirming the extension distance, the second wedge strip (2) is pushed in the direction of the first wedge surface (3) until it cannot be moved. At this time, the distance A1 between the second wedge strip (2) and the top surface (73) of the guide portion (71) is recorded. At this time, the distance B by which the first wedge strip (1) extends beyond the first limiting surface (74) is recorded. Installation step S3, sliding the gap measuring unit and the limiting unit (7) assembled in the assembly step S1 into the positioning hole (14) of the compressor cylinder, and passing through the positioning hole (14) and the circumferential groove (10), and the positioning portion (75) sliding along the guide groove of the positioning hole (14) to ensure that the limiting surface (74) is parallel to the opening direction of the circumferential groove (10); In a close contact judgment step S4, the stator ring (5) is rotated circumferentially so that the circumferential groove (10) and the extended portion of the second wedge strip (2) are in close contact and continue to move until the circumferential groove (10) and the limit surface (74) are in close contact. At this time, the distance A2 between the first wedge strip (1) and the top surface (73) of the guide portion (71) is recorded. The difference between the distance A2 between the first wedge strip (1) and the top surface (73) of the guide portion (71) measured in this step and the distance A1 between the first wedge strip (1) and the top surface (73) of the guide portion (71) measured in the extended distance confirmation step S2 is C=A2-A1. By judging the relationship between B and C, it is judged whether the positioning portion (75) and the circumferential groove (10) are in close contact. A radial limiting step S5, in which, in the close contact determination step S4, if it is determined that the positioning portion (75) is in close contact with the circumferential groove (10), the second wedge strip (2) is removed and the locking unit (6) is tightened; In the circumferential clearance measuring step S6 , the circumferential clearance between the ring segments is measured.

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