Grate tooth sealing assembly, gas turbine and active clearance control method

Abstract

The embodiment of the invention discloses a labyrinth sealing assembly, a gas turbine and an active clearance control method.The labyrinth sealing assembly comprises a stator casing and a rotor, an annular deformation part is arranged on the inner circumferential wall of the stator casing, and the central axis of the deformation part and the central axis of the stator casing are coaxially arranged; the deformation part can actively deform in the radial direction of the stator casing, the rotor is provided with at least two labyrinth teeth, the position of at least one labyrinth tooth corresponds to the deformation part in the radial direction of the stator casing, the labyrinth teeth are defined as active control labyrinth teeth, and the active control labyrinth teeth are consistent with other labyrinth teeth in outer diameter and cold-state gap value. The gap between the deformation part and the active control comb teeth is adjusted through deformation of the deformation part. The labyrinth sealing assembly provided by the embodiment of the invention is mainly used for reducing leakage between the rotor and the stator and improving the efficiency of the gas turbine. Through active adjustment of the deformation part, the minimum leakage gap can be kept, and therefore energy loss is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of power machinery, and in particular to a comb tooth sealing component, a gas turbine and an active clearance control method. Background Art

[0002] In the gas turbine structure, comb tooth seals are widely used between the rotor and stator to achieve minimum leakage and meet sealing requirements due to their simple structure, low cost, easy maintenance, high reliability at high temperature and high speed, and good rotor dynamic characteristics.

[0003] In order to reduce seal leakage, the smaller the grate gap is, the better. However, since the grate gap is affected by bearing clearance, rotor bending, rotor vibration, and rotor processing and assembly errors, a larger margin of cold clearance needs to be reserved. If the cold clearance of the grate is designed to be too large, the hot clearance of the gas turbine in the working state will also be large, which will lead to seal leakage problems. At the same time, if the cold clearance of the grate is designed to be too small, the gas turbine rotor will be stuck during mechanical operation, and it is easy to collide and rub in the working state, which may cause mechanical failure. Summary of the invention

[0004] The present invention is based on the inventor's discovery and understanding of the following facts and problems:

[0005] In the related art, the control methods of the comb tooth gap are divided into two types: passive and active.

[0006] In the passive method, the spoke plate structure of the comb disc is improved to keep the comb tooth gap at a small value when cold and achieve a small value when hot. However, this scheme has difficulties such as difficulty in material selection and difficulty in accurately calculating the deformation under different working conditions.

[0007] In the active method, memory alloy wire is used to connect the active gap control mechanism to control the outward movement of multiple rows of circumferential comb teeth when the temperature is high, thereby increasing the sealing gap. However, this scheme has problems such as uneven rotor-stator gap and axial gaps generated by the circumferentially arranged comb tooth seats during outward movement, resulting in increased leakage.

[0008] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0009] To this end, an embodiment of the present invention provides a comb teeth sealing assembly capable of actively controlling the gap.

[0010] The comb teeth sealing assembly of the embodiment of the present invention includes a stator casing and a rotor, the inner circumferential wall of the stator casing is provided with an annular deformation portion, the central axis of the deformation portion and the central axis of the stator casing are coaxially arranged, the deformation portion can actively deform along the radial direction of the stator casing, the rotor is provided with at least two comb teeth, at least one of which is located corresponding to the deformation portion in the radial direction of the stator casing, the comb teeth are defined as actively controlled comb teeth, the outer diameter and cold clearance value of the actively controlled comb teeth are consistent with those of the other comb teeth, and the gap between the deformation portion and the actively controlled comb teeth is adjusted by deformation of the deformation portion.

[0011] In some embodiments, the stator casing includes at least two straight sections arranged at intervals along the axial direction of the stator casing and a transition section connecting two adjacent straight sections, the inner diameter of the transition section is larger than the inner diameter of the straight section, the deformation portion is located in the transition section, and the inner diameter of the deformation portion is equal to the inner diameter of the straight section.

[0012] In some embodiments, two opposite step surfaces are formed between the transition section and the two straight sections connected thereto, and both step surfaces are provided with annular assembly grooves, and the two assembly grooves correspond to each other along the axial direction of the stator casing. The assembly grooves are located at the intersection of the step surface and the inner wall surface of the straight section, and the two ends of the deformation portion are respectively installed in the two assembly grooves.

[0013] In some embodiments, the inner wall surface of the transition section, the outer wall surface of the deformation portion and the two step surfaces jointly define a closed annular cavity, and the transition section is provided with a liquid inlet hole and a liquid return hole connected to the closed annular cavity, so as to fill the fluid medium into the closed annular cavity through the liquid inlet hole and discharge the fluid medium in the closed annular cavity through the liquid return hole.

[0014] In some embodiments, a pressure control valve and a pressure sensor are provided on the upstream pipeline of the liquid inlet hole, and a switch valve is provided on the downstream pipeline of the liquid return hole.

[0015] In some embodiments, a monitoring hole is provided on the straight section, a distance sensor is provided in the monitoring hole, and the comb teeth corresponding to the distance sensor in the radial direction of the stator casing are real-time measurement comb teeth.

[0016] In some embodiments, the deformation portion is an elastic metal part in a full ring shape, and the wall thickness of the deformation portion is smaller than the wall thickness of the stator casing.

[0017] In some embodiments, the tooth tops of the actively controlled comb teeth correspond to the position of maximum radial deformation of the deformation portion in the radial direction of the stator casing.

[0018] The comb teeth sealing assembly of the embodiment of the present invention controls the deformation part on the inner wall of the stator casing to actively deform by hydraulic means, thereby realizing the adjustment of the comb teeth clearance, and has a simple structure and a simple principle. By hydraulic means, the pressure in the closed annular cavity is evenly stressed, so that the deformation of the deformation part is even, which can improve the shortcomings of the previous active clearance control scheme that only realizes radial deformation in certain specific directions of the circumference. The deformation part is fixed to the inner wall of the stator casing by welding, and the processing method is simple and easy to implement.

[0019] An embodiment of the present invention further provides a gas turbine.

[0020] The gas turbine of the embodiment of the present invention comprises the comb tooth sealing assembly described in any one of the above embodiments.

[0021] An embodiment of the present invention further provides an active gap control method, which is applicable to the comb tooth sealing assembly described in any one of the above embodiments.

[0022] The active gap control method of the embodiment of the present invention includes:

[0023] Design the comb tooth gap interval [△1, △2];

[0024] Fill the closed annular cavity of the stator casing with hydraulic medium, adjust the liquid inlet pressure p, and measure the liquid inlet pressure value and the maximum radial deformation value of the deformation part △ p , and obtain the liquid inlet pressure p and the maximum radial deformation value of the deformation part △ p The functional relationship of p =f(p), and the deformation value of the deformation part toward the axis of the stator casing is negative;

[0025] Get the real-time comb tooth gap value△ a ;

[0026] Control the inlet pressure p, according to the functional relationship △ p =f(p), calculate the maximum radial deformation value of the deformation part△ p ;

[0027] According to the real-time minimum gap value calculation formula △ min =△ a +△ p , the real-time comb tooth gap value △ a Maximum radial deformation value of the superimposed deformation part△ p , get the real-time minimum gap value △ min ;

[0028] Determine the real-time minimum gap value△ min Is it within the real-time comb tooth gap interval [△1, △2]? If not, continue to adjust the liquid inlet pressure p; if within the interval, the process ends. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a cross-sectional schematic diagram of a comb teeth sealing assembly according to an embodiment of the present invention.

[0030] Figure 2 is a flow chart of an active gap control method according to an embodiment of the present invention.

[0031] Reference numerals:

[0032] 1-rotor, 2-active control grate teeth, 3-real-time measurement grate teeth, 4-stator casing, 5-closed ring cavity, 6-liquid inlet hole, 7-deformation part, 8-distance sensor, 9-liquid return hole. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0034] The comb teeth sealing assembly according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

[0035] like Figure 1 As shown, the comb seal assembly of the embodiment of the present invention comprises a stator casing 4 and a rotor 1. The inner peripheral wall of the stator casing 4 is provided with an annular deformation portion 7, the central axis of the deformation portion 7 is coaxially arranged with the central axis of the stator casing 4, and the deformation portion 7 can actively deform along the radial direction of the stator casing 4.

[0036] The rotor 1 has at least two comb teeth, at least one of which is located corresponding to the deformation portion 7 in the radial direction of the stator casing 4. The comb tooth is defined as an actively controlled comb tooth 2. The outer diameter and cold clearance value of the actively controlled comb tooth 2 are consistent with those of other comb teeth. The clearance between the deformation portion 7 and the actively controlled comb tooth 2 is adjusted by deforming the deformation portion 7.

[0037] It is understandable that the comb teeth clearance mentioned in the related art is affected by factors such as bearing clearance and rotor 1 bending, and these factors may change during operation, resulting in the gap not always being maintained in the optimal state. The comb teeth sealing assembly of the embodiment of the present invention makes it possible to adjust the gap by introducing an annular deformation portion 7 that can actively deform in the radial direction. The deformation portion 7 on the inner circumferential wall of the stator casing 4 can respond to an external control signal to adjust and actively control the gap between the comb teeth 2.

[0038] The active control comb teeth 2 of the embodiment of the present invention have the same outer diameter and cold clearance value as other comb teeth, ensuring the uniformity of the design. By deforming the deformation portion 7, the clearance in the hot state can be accurately adjusted, thereby reducing sealing leakage caused by excessive hot clearance.

[0039] Furthermore, the adjustable gap design of the embodiment of the present invention avoids the problem in the related art that the cold state gap is designed to be too small, which may cause the rotor 1 to get stuck or rub during mechanical operation, causing mechanical failure, because the deformation portion 7 can adjust the gap according to the actual operating state of the rotor 1 to ensure that no jamming or rubbing will occur even in a hot state.

[0040] The comb teeth sealing assembly according to the embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0041] like Figure 1 As shown, the comb seal assembly of the specific embodiment of the present invention includes a stator casing 4 and a rotor 1.

[0042] The stator casing 4 includes at least two straight sections spaced apart along the axial direction of the stator casing 4 and a transition section connecting two adjacent straight sections. Optionally, there are two straight sections and one transition section, the transition section is connected between the two straight sections, and each section is connected by welding or other means to ensure the sealing performance of the stator casing 4, effectively prevent gas leakage, and thus reduce energy loss.

[0043] The inner diameter of the transition section is larger than that of the straight section. Two opposite step surfaces are formed between the transition section and the two straight sections connected thereto. An annular assembly groove is provided on both step surfaces. The two assembly grooves correspond to each other in the axial direction of the stator casing 4. The assembly groove is located at the intersection of the step surface and the inner wall surface of the straight section. The annular assembly groove design provides an auxiliary structure for installing and fixing other components (such as the deformation portion 7), which helps to ensure the correct position and fixation of the components.

[0044] An annular deformation portion 7 is provided on the inner side of the transition section, and the deformation portion 7 can actively deform along the radial direction of the stator casing 4. The two ends of the deformation portion 7 are respectively installed in two assembly grooves by welding, and the inner diameter of the deformation portion 7 is equal to the inner diameter of the straight section.

[0045] Preferably, the deformation part 7 is a fully annular elastic metal part, and the wall thickness of the deformation part 7 is less than the wall thickness of the stator casing 4, so that the deformation response speed of the elastic metal part is fast, and it can quickly adapt to the state change and reduce the sealing leakage. In addition, the fully annular elastic metal part design ensures the integrity and stability of the structure and reduces the safety risks in operation.

[0046] The annular deformation portion 7 can be actively deformed, which is the key to achieving active clearance control. By changing the shape of the deformation portion 7, the clearance between the active control comb teeth 2 can be adjusted. The design of the deformation portion 7 allows the clearance to be adjusted as needed during operation to adapt to changes in the position of the rotor 1 caused by temperature changes, mechanical vibrations, etc. Therefore, during the operation of the gas turbine, the clearance can be dynamically adjusted according to the actual operating conditions, thereby improving the adaptability and reliability of the system.

[0047] For example, the inner wall surface of the transition section, the outer wall surface of the deformation portion 7 and the two step surfaces jointly define the closed annular cavity 5, and the transition section is provided with a liquid inlet hole 6 and a liquid return hole 9 connected to the closed annular cavity 5, so that the fluid medium (hydraulic oil) can be filled into the closed annular cavity 5 through the liquid inlet hole 6, and the fluid medium in the closed annular cavity 5 can be discharged through the liquid return hole 9. By filling or discharging the fluid medium into the closed annular cavity 5 through the liquid inlet hole 6 and the liquid return hole 9, the deformation of the deformation portion 7 can be controlled, and then the gap can be adjusted.

[0048] A pressure control valve and a pressure sensor are provided on the upstream pipeline of the liquid inlet hole 6. The pressure control valve is used to adjust the liquid inlet pressure of the closed annular cavity 5, and the pressure sensor is used to monitor the liquid inlet pressure of the closed annular cavity 5. A switch valve is provided on the downstream pipeline of the liquid return hole 9. The switch valve is used to control the on-off of the liquid return pipeline. The liquid inlet pressure can be accurately adjusted by the pressure control valve and the pressure sensor, thereby realizing fine control of the gap and improving the sealing performance.

[0049] The rotor 1 has at least two grate teeth (for example, straight teeth, helical teeth, special-shaped teeth), wherein the position of at least one grate tooth corresponds to the deformation portion 7 in the radial direction of the stator casing 4, and the grate tooth is defined as the actively controlled grate tooth 2. The gap between the deformation portion 7 and the actively controlled grate tooth 2 is adjusted by deforming the deformation portion 7. Preferably, the tooth top of the actively controlled grate tooth 2 corresponds to the maximum radial deformation of the deformation portion 7 in the radial direction of the stator casing 4. The outer diameter and cold clearance value of the actively controlled grate tooth 2 are consistent with those of other grate teeth.

[0050] A monitoring hole is provided on the straight section, and a distance sensor 8 is provided in the monitoring hole. The grate teeth corresponding to the distance sensor 8 in the radial direction of the stator casing 4 are real-time measuring grate teeth 3. The distance sensor 8 is used for real-time monitoring of the gap value.

[0051] In summary, the comb teeth sealing assembly of the embodiment of the present invention controls the deformation portion 7 on the inner wall surface of the stator casing 4 to actively deform by hydraulic means, thereby realizing the adjustment of the comb teeth clearance, and has a simple structure and a simple principle. By hydraulic means, the pressure in the closed annular cavity 5 is evenly stressed, so that the deformation of the deformation portion 7 is even, which can improve the shortcomings of the previous active clearance control scheme that only radial deformation is achieved in certain specific directions of the circumference. The deformation portion 7 is fixed to the inner wall of the stator casing 4 by welding, and the processing method is simple and easy to implement.

[0052] Next, a gas turbine according to an embodiment of the present invention will be described.

[0053] The gas turbine of the embodiment of the present invention includes the comb seal assembly in any of the above embodiments. The main function of the comb seal assembly is to reduce the leakage between the rotor 1 and the stator and improve the efficiency of the gas turbine. Through the active adjustment of the deformation part 7, the minimum leakage gap can be maintained, thereby reducing energy loss.

[0054] During the operation of the gas turbine, the rotor 1 and the stator may be displaced due to temperature changes, vibrations, etc. The comb seal assembly can adapt to these displacements and maintain an effective sealing effect.

[0055] The active gap control method according to an embodiment of the present invention is described below in conjunction with the accompanying drawings. The active gap control method is applicable to the comb tooth sealing assembly in any of the above embodiments.

[0056] like Figure 2 As shown, the active gap control method of the embodiment of the present invention includes:

[0057] S1: Design the comb tooth gap interval [△1, △2] according to the actual working conditions.

[0058] S2: After the stator casing 4 is welded, hydraulic oil is introduced into the closed annular cavity 5 of the stator casing 4. When the oil fills the closed annular cavity 5, the valve of the return hole 9 is closed, and the oil inlet pressure p is continuously adjusted through the pressure control valve. The inlet pressure value and the maximum radial deformation value of the deformation part 7 are measured. p After multiple measurements, the mathematical fitting method is used to obtain the liquid inlet pressure p and the maximum radial deformation value of the deformation part 7 △ p The functional relationship of p =f(p). To ensure the consistency of the signs, the deformation value of the deformation portion 7 in the axial direction of the stator casing 4 is specified as △ p is negative, otherwise it is positive.

[0059] S3: After the rotor 1 is installed, when the rotor 1 rotates, the distance sensor 8 is used to obtain the real-time measurement of the gap value of the comb teeth 3 △ a .

[0060] S4: Control the liquid inlet pressure p, according to the functional relationship △ p =f(p), calculate the maximum radial deformation value of the deformation portion 7 △ p .

[0061] S5: Calculate the minimum clearance value according to the real-time formula △ min =△ a +△ p , the gap value of the comb teeth 3 will be measured in real time aMaximum radial deformation value of the superimposed deformation portion 7 △ p , get the real-time minimum gap value △ min .

[0062] S6: Determine the real-time minimum gap value △ min Whether it meets the design requirements, that is, whether it is within the real-time comb tooth gap interval [△1, △2]. If not, return to step 4 and continue to adjust the liquid inlet pressure p. If it is within the interval, the process ends.

[0063] Therefore, the active clearance control method of the embodiment of the present invention first controls the oil inlet pressure of the closed annular cavity 5 of the stator casing 4, measures the radial deformation of the elastic thin-walled metal part, and obtains the functional relationship between the two; then, according to the above functional relationship, controls the oil inlet pressure, calculates the maximum radial deformation of the elastic thin-walled metal part, and superimposes the real-time monitoring clearance value to obtain the real-time minimum clearance value that meets the design requirements.

[0064] In addition, the hydraulic casing structure and the active clearance control method of the embodiment of the present invention can be applied to both straight-through and stepped comb tooth sealing structures.

[0065] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0066] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0067] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0069] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0070] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A comb teeth sealing assembly, characterized in that: include: A stator casing, wherein an annular deformation portion is provided on the inner peripheral wall of the stator casing, the central axis of the deformation portion is coaxially arranged with the central axis of the stator casing, and the deformation portion can actively deform along the radial direction of the stator casing; A rotor having at least two grate teeth, wherein the position of at least one of the grate teeth corresponds to the deformation portion in the radial direction of the stator casing, and the grate teeth are defined as actively controlled grate teeth, the outer diameter and cold clearance value of the actively controlled grate teeth are consistent with those of the other grate teeth, and the clearance between the deformation portion and the actively controlled grate teeth is adjusted by deformation of the deformation portion.

2. The comb teeth sealing assembly according to claim 1, characterized in that: The stator casing includes at least two straight sections arranged at intervals along the axial direction of the stator casing and a transition section connecting two adjacent straight sections, the inner diameter of the transition section is larger than the inner diameter of the straight section, the deformation portion is located in the transition section, and the inner diameter of the deformation portion is equal to the inner diameter of the straight section.

3. The comb teeth sealing assembly according to claim 2, characterized in that: Two opposite step surfaces are formed between the transition section and the two straight sections connected thereto, and an annular assembly groove is provided on the two step surfaces. The two assembly grooves correspond to each other in the axial direction of the stator casing, and the assembly groove is located at the intersection of the step surface and the inner wall surface of the straight section, and the two ends of the deformation portion are respectively installed in the two assembly grooves.

4. The comb teeth sealing assembly according to claim 3, characterized in that: The inner wall surface of the transition section, the outer wall surface of the deformation portion and the two step surfaces jointly define a closed annular cavity. The transition section is provided with a liquid inlet hole and a liquid return hole connected to the closed annular cavity, so that the fluid medium is filled into the closed annular cavity through the liquid inlet hole and the fluid medium in the closed annular cavity is discharged through the liquid return hole.

5. The comb teeth sealing assembly according to claim 4, characterized in that: A pressure control valve and a pressure sensor are arranged on the upstream pipeline of the liquid inlet hole, and a switch valve is arranged on the downstream pipeline of the liquid return hole.

6. The comb teeth sealing assembly according to claim 2, characterized in that: A monitoring hole is provided on the straight section, a distance sensor is provided in the monitoring hole, and the comb teeth corresponding to the distance sensor in the radial direction of the stator casing are real-time measurement comb teeth.

7. The comb teeth sealing assembly according to any one of claims 1 to 6, characterized in that: The deformation portion is a fully annular elastic metal part, and the wall thickness of the deformation portion is smaller than the wall thickness of the stator casing.

8. The comb teeth sealing assembly according to claim 7, characterized in that: The tooth tops of the active control comb teeth correspond to the maximum radial deformation position of the deformation portion in the radial direction of the stator casing.

9. A gas turbine, characterized in that: The invention comprises a comb tooth sealing assembly as described in any one of claims 1 to 8.

10. An active gap control method, characterized in that: The active gap control method is applicable to the comb tooth sealing assembly according to any one of claims 1 to 8, and the active gap control method comprises: Design the comb tooth gap interval [△1, △2]; Fill the closed annular cavity of the stator casing with hydraulic medium, adjust the liquid inlet pressure p, and measure the liquid inlet pressure value and the maximum radial deformation value of the deformation part △ p , and obtain the liquid inlet pressure p and the maximum radial deformation value of the deformation part △ p The functional relationship of p =f(p), and the deformation value of the deformation part toward the axis of the stator casing is negative; Get the real-time comb tooth gap value△ a ; Control the inlet pressure p, according to the functional relationship △ p =f(p), calculate the maximum radial deformation value of the deformation part△ p ; According to the real-time minimum gap value calculation formula △ min =△ a +△ p , the real-time comb tooth gap value △ a Maximum radial deformation value of the superimposed deformation part△ p , get the real-time minimum gap value △ min ; Determine the real-time minimum gap value△ min Is it within the real-time comb tooth gap interval [△1, △2]? If not, continue to adjust the liquid inlet pressure p; if within the interval, the process ends.

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