Compressor rotor pressing device and pressing method

Abstract

The application discloses a compressor rotor pressing device and a pressing method. The compressor rotor pressing device comprises a variable-diameter clamp, a pressure mechanism and a torque wrench. The outer diameter of the variable-diameter clamp can be adjusted tightly, the variable-diameter clamp is used for penetrating through a pull rod locking nut in an axial direction and is threadedly connected with an inner hole of a central pull rod, so as to clamp and fix the central pull rod; the pressure mechanism is installed on the variable-diameter clamp and is used for abutting against a rotor and applying an axial pressure to the rotor and an axial tension to the variable-diameter clamp in a direction away from the rotor; and the torque wrench is used for clamping the pull rod locking nut and applying a torque to the pull rod locking nut, so as to lock the central pull rod with an axial force reaching a preset range. For the compressor rotor assembly with an inner hole of the pull rod locking nut being smaller than an inner hole of the central pull rod, the variable-diameter clamp can be inserted into the inner hole of the pull rod locking nut and connected with the central pull rod into an integral structure, the inner thread of the central pull rod is used for achieving the pressing requirement of the axial force, and the safety and reliability of the compressor rotor assembly are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engine assembly, in particular, to a compressor rotor pressing device. Furthermore, the present application also relates to a compressor rotor pressing method using the compressor rotor pressing device. BACKGROUND

[0002] An aero-engine is a core component of an aircraft, which provides power required for flight of the aircraft through high-speed rotation of a compressor rotor. The high-speed rotation of the compressor rotor needs to withstand huge centrifugal force and axial force, so the assembly strength of the compressor rotor is crucial. The compressor rotor is composed of a center pull rod, a centrifugal impeller and a plurality of integral blade discs, and the assembly of the compressor rotor is to place the plurality of integral blade discs and the centrifugal impeller on a base in turn from bottom to top, and to connect them through circular arc end teeth to center and transmit torque, and then to pass the center pull rod through the center holes of the plurality of integral blade discs and the centrifugal impeller in the axial direction, so that one end of the center pull rod with external threads is fastened with the shaft neck of the integral blade disc through threads, and the other end is abutted against the end face of the centrifugal impeller through the pull rod locking nut to form a rigid whole. At this time, an axial force exceeding 80KN needs to be applied to the center pull rod to meet the requirement of assembly pre-tightening force, and then a larger torque is applied to the pull rod locking nut through a torque wrench to press the pull rod locking nut against the end face of the centrifugal impeller to complete the assembly of the compressor rotor.

[0003] The center pull rod is a hollow thin-walled shaft, and the inner hole of the connecting end of the pull rod locking nut is provided with internal threads. When the compressor rotor is assembled, the internal threads are used to load the axial force on the center pull rod. However, since the pull rod locking nut is a variable-diameter hollow structure, the inner diameter of the end away from the centrifugal impeller is smaller than the inner diameter of the center pull rod, so the general tooling tool cannot pass through the inner hole of the pull rod locking nut to cooperate with the internal threads of the center pull rod, so that the requirement of loading the axial force exceeding 80KN on the center pull rod through the internal threads of the center pull rod cannot be met. In addition, since a larger axial force needs to be applied to the center pull rod, the stability of the compressor rotor assembly process is difficult to guarantee, and the strong holding is easy to cause deformation of the shaft body of the center pull rod. At the same time, the pull rod locking nut needs to be tightened through the torque wrench, which requires higher operation requirements, and the operation is easy to slip and damage the parts. SUMMARY

[0004] The present application provides a compressor rotor pressing device to solve the technical problem that the pressing of the center pull rod with the structure that the inner hole diameter of the pull rod locking nut is smaller than the inner hole diameter of the center pull rod cannot meet the requirement of axial force in the prior art.

[0005] According to one aspect of the present application, a pressurizing device for a compressor rotor assembly is provided, the compressor rotor assembly comprising a rotor, a center pull rod axially penetrating a center hole of the rotor, and a pull rod locking nut sleeved on the center pull rod for pressing the rotor, the pressurizing device comprising:

[0006] a variable-diameter clamp, which is axially penetrated through the pull rod locking nut and is threadedly connected with an inner hole of the center pull rod to clamp and fix the center pull rod;

[0007] a pressure mechanism, which is installed on the variable-diameter clamp and is used for abutting against the rotor and for applying an axial pressure to the rotor and an axial tension to the variable-diameter clamp in a direction away from the rotor to make the axial force of the center pull rod reach a preset range;

[0008] a torque wrench, which is used for clamping the pull rod locking nut and applying a torque to the pull rod locking nut to lock the center pull rod with the axial force reaching the preset range.

[0009] Further, the variable-diameter clamp comprises a limiting screw, a variable-diameter assembly, a positioning assembly and a locking member, which are axially and sequentially sleeved on the limiting screw, and the variable-diameter assembly is movably clamped on the limiting screw;

[0010] an end of the limiting screw away from the locking member is provided with a variable-diameter structure, a first end of the variable-diameter assembly is used for being driven by the variable-diameter structure to radially expand and clamp the inner hole of the center pull rod, the positioning assembly movably cooperates with the limiting screw, and the positioning assembly is used for being axially inserted into a second end of the variable-diameter assembly to circumferentially limit and expand the second end of the variable-diameter assembly;

[0011] the locking member is threadedly connected with the limiting screw to lock the positioning assembly and the variable-diameter assembly on the limiting screw.

[0012] Further, the variable-diameter assembly comprises a support disc movably axially penetrating the limiting screw, a track block and a limiting rod fixed to axially two ends of the support disc, and a variable-diameter ring movably installed in the track block in a radial direction, the limiting rod is arranged at an end of the support disc away from the rotor to be clamped with the positioning assembly to limit circumferential rotation thereof;

[0013] the variable-diameter ring is used for being guided to move along the track block, and an outer wall of an end of the variable-diameter ring away from the support disc is provided with an external thread to be threadedly connected with the inner hole of the center pull rod.

[0014] Further, the positioning assembly comprises an inner expanding sleeve movably sleeved on the limiting screw in an axial direction, and a positioning disc annularly arranged outside the inner expanding sleeve and fixedly connected with the inner expanding sleeve, the positioning disc is provided with an anti-rotation groove corresponding to the limiting rod to be axially penetrated by the limiting rod.

[0015] The inner expanding sleeve is arranged towards the variable-diameter assembly and is inserted into the second end of the variable-diameter ring in the axial direction to expand the inner hole of the variable-diameter ring and abut the variable-diameter ring against the inner wall of the central pull rod.

[0016] Further, the limiting screw comprises a guide section movably connected with the variable-diameter assembly and the positioning assembly in the axial direction, an expanding section for expanding the inner hole of the variable-diameter ring to abut against the inner wall of the central pull rod, a tapered transition section arranged between the guide section and the expanding section, and a limiting boss arranged on the side of the expanding section away from the guide section for axially limiting the variable-diameter ring, wherein the outer diameter of the limiting boss is smaller than the minimum inner diameter of the pull rod locking nut, and the tapered transition section and the expanding section jointly form a variable-diameter structure.

[0017] Further, the pressure mechanism comprises a support sleeve, a hydraulic device and a fixing assembly which are sequentially arranged on the outside of the variable-diameter clamp in the axial direction, the fixing assembly is arranged on the end of the variable-diameter clamp away from the rotor and is threadedly connected with the limiting screw, and is used for pressing the support sleeve and the hydraulic device against the end surface of the rotor.

[0018] The hydraulic device is axially clamped with the support sleeve and is fixedly connected with the limiting screw, and is used for applying an axial tension to the fixing assembly in the direction away from the rotor, so as to apply an axial pre-tightening force to the central pull rod through the cooperation of the fixing assembly and the limiting screw.

[0019] Further, the side edge of the support sleeve is provided with an opening for the operation end of the torque wrench to extend out.

[0020] Further, the fixing assembly comprises a pre-tightening nut and a pressing plate arranged between the pre-tightening nut and the hydraulic device, the pre-tightening nut is threadedly connected with the limiting screw, and is used for pressing the pressing plate against the hydraulic device.

[0021] Further, the torque wrench comprises a wrench ring for being clamped outside the pull rod locking nut and a handle fixed to the wrench ring, and the inner wall of the wrench ring is provided with a clamping groove for clamping with the pull rod locking nut.

[0022] According to another aspect of the present application, a method for pressing the rotor of the air compressor by using the rotor pressing device is also provided, which comprises the following steps:

[0023] S1: inserting the central pull rod into the rotor in the axial direction, clamping the pull rod locking nut outside the central pull rod to press the end surface of the rotor, and clamping the torque wrench outside the pull rod locking nut to clamp with the pull rod locking nut;

[0024] S2: inserting the variable-diameter clamp into the pull rod locking nut in the axial direction, and threadedly connecting the variable-diameter clamp with the inner hole of the central pull rod to be integrated;

[0025] S3: A pressure mechanism is sleeved outside the variable-diameter clamp to fix the variable-diameter clamp and abut against the end face of the rotor, axial pressure is applied to the rotor by controlling the pressure mechanism, and the variable-diameter clamp is clamped to apply axial tension to the variable-diameter clamp in a direction away from the rotor, so that the center pull rod is forced synchronously with the variable-diameter clamp;

[0026] S4: When the axial force of the center pull rod reaches a preset range, the torque wrench applies torque to the pull rod locking nut to lock the center pull rod and the rotor, thereby completing the tension and compression assembly of the rotor.

[0027] The compressor rotor pressing device has the following beneficial effects:

[0028] The compressor rotor pressing device has the following beneficial effects:

[0029] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings, which form a part of the present application, are intended to provide a further understanding of the present application, and the illustrative embodiments thereof, and are not intended to limit the present application. In the drawings:

[0031] Figure 1 is a cross-sectional schematic view of the compressor rotor pressing device of the preferred embodiment of the present application in a pressing state;

[0032] Figure 2 is a cross-sectional schematic view of the variable-diameter clamp of the preferred embodiment of the present application;

[0033] Figure 3 is a structural schematic view of the pressure mechanism of the preferred embodiment of the present application;

[0034] Figure 4 Fig. 4 is an A-A sectional view of the pressurizing device of the compressor rotor according to a preferred embodiment of the present application;

[0035] Figure 5 Fig. 5 is a structural schematic view of the torque wrench according to a preferred embodiment of the present application.

[0036] Fig. 6 is a structural schematic view of the torque wrench according to another preferred embodiment of the present application.

[0037] 100, rotor; 200, center pull rod; 300, pull rod locking nut; 400, variable diameter clamp; 401, limiting screw; 4011, guide section; 4012, tensioning section; 4013, conical transition section; 4014, limiting boss; 402, variable diameter assembly; 4021, support disc; 4022, track block; 4023, limiting rod; 4024, variable diameter ring; 403, positioning assembly; 4031, inner tensioning sleeve; 4032, positioning disc; 404, locking member; 500, pressure mechanism; 501, support sleeve; 502, hydraulic device; 503, fixing assembly; 5031, pre-tightening nut; 5032, pressure plate; 600, torque wrench; 601, wrench ring; 6011, clamping groove; 602, handle. DETAILED DESCRIPTION

[0038] The embodiments of the present application will be described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways as defined and covered by the following description.

[0039] As Figure 1As shown, the compressor rotor pressing device of the embodiment is used for disassembling and assembling the compressor rotor assembly, the compressor rotor assembly comprises a rotor 100, a center pull rod 200 axially penetrating into the center hole of the rotor 100, and a pull rod locking nut 300 sleeved on the center pull rod 200 and used for pressing the rotor 100. The compressor rotor pressing device comprises a variable-diameter clamp 400, a pressure mechanism 500 and a torque wrench 600. Specifically, the outer diameter of the variable-diameter clamp 400 can be adjusted to be expanded, the variable-diameter clamp 400 is used for penetrating through the pull rod locking nut 300 in the axial direction and is threadedly connected with the inner hole of the center pull rod 200, so as to clamp and fix the center pull rod 200, and the variable-diameter clamp 400 is fixedly connected with the center pull rod 200 to form an integral structure. The pressure mechanism 500 is installed on the variable-diameter clamp 400 and is used for abutting against the end surface of the rotor 100, and is used for applying an axial pressure to the rotor 100 in the direction of the rotor 100 and applying an axial tension to the variable-diameter clamp 400 in the direction away from the rotor 100, so that the axial force control of the center pull rod 200 can be realized by controlling the pressure mechanism 500 to apply the axial force to the variable-diameter clamp 400, so that the axial force of the center pull rod 200 reaches a preset range, and preferably, the preset range is 80 KN. By installing the pressure mechanism 500 on the variable-diameter clamp 400 and abutting against the rotor 100 in the axial direction, the variable-diameter clamp 400 can be positioned, the coaxiality of the variable-diameter clamp 400, the center pull rod 200 and the rotor 100 is ensured, the center pull rod 200 is prevented from shaking when the pressure mechanism 500 applies a large axial force, the shaft of the center pull rod 200 is prevented from deforming, and the stability of the assembly process of the compressor rotor 100 is ensured. The torque wrench 600 is used for clamping the pull rod locking nut 300 and applying a torque to the pull rod locking nut 300, so as to lock the center pull rod 200 whose axial force reaches the preset range. By clamping the torque wrench 600 and the pull rod locking nut 300, the problem of slipping due to carelessness of operation is prevented, and the parts are prevented from being damaged. Therefore, for the compressor rotor assembly whose inner hole of the pull rod locking nut 300 is smaller than the inner hole of the center pull rod 200, the axial force pressing requirement can be realized by using the inner thread of the center pull rod 200, the safety and reliability of the pressing assembly of the compressor rotor assembly is ensured, and time and labor are saved.

[0040] As shown in Figure 1 and Figure 2 The variable-diameter clamp 400 comprises a limiting screw 401, a variable-diameter assembly 402, a positioning assembly 403 and a locking piece 404. The limiting screw 401 penetrates into the variable-diameter assembly 402, the positioning assembly 403 and the locking piece 404 in sequence in the axial direction. The variable-diameter assembly 402 comprises a fixed end penetrating into the limiting screw 401 in the axial direction and a movable end slidingly installed in the fixed end in the radial direction. The movable end is arranged on the side of the variable-diameter assembly 402 close to the rotor 100 and is in movable hoop cooperation with the limiting screw 401. The movable end comprises a first end cooperating with the limiting screw 401 and a second end cooperating with the positioning assembly 403.

[0041] Specifically, the limiting screw 401 is provided with a variable-diameter structure at one end close to the rotor 100. By controlling the movement of the limiting screw 401 in a direction away from the rotor 100, the variable-diameter structure can be inserted into the first end of the movable end of the variable-diameter assembly 402 to expand the inner hole of the variable-diameter assembly 402 for variable-diameter, so that the outer diameter of the first end of the movable end of the variable-diameter assembly 402 is increased to adapt to the inner hole diameter of the center pull rod 200 to contact the inner wall of the center pull rod 200. In addition, the limiting screw 401 is also provided with a limiting structure, which is arranged on the side of the variable-diameter structure away from the variable-diameter assembly 402, for axially limiting the movable end of the variable-diameter assembly 402 to prevent the movable end of the variable-diameter assembly 402 from being pulled out of the limiting screw 401 in the axial direction after variable-diameter. The limiting screw 401 can drive the variable-diameter assembly 402 to move in the axial direction away from the rotor 100 through the limiting structure, so that the axial tension on the limiting screw 401 can be transmitted to the variable-diameter assembly 402. The positioning assembly 403 close to one end of the variable-diameter assembly 402 can be inserted into the second end of the movable end of the variable-diameter assembly 402 in the axial direction to expand the inner hole of the variable-diameter assembly 402 for variable-diameter, so that the outer diameter of the second end of the movable end of the variable-diameter assembly 402 away from the rotor 100 is also increased to adapt to the inner hole diameter of the center pull rod 200, ensuring that the hole diameters of both ends of the movable end of the variable-diameter assembly 402 are the same, avoiding the local contact of the movable end of the variable-diameter assembly 402 with the limiting screw 401, and preventing the local stress on the limiting screw 401. The positioning assembly 403 inserted into the variable-diameter assembly 402 in the axial direction forms an anti-rotation structure with the variable-diameter assembly 402, so that the variable-diameter assembly 402 can be synchronously rotated by rotating the positioning assembly 403 to make the outer wall of the variable-diameter assembly 402 threadedly connected with the inner wall of the center pull rod 200, realizing the fixation of the variable-diameter assembly 402 with the center pull rod 200. The locking member 404 is threadedly connected with the limiting screw 401 to lock the positioning assembly 403 and the variable-diameter assembly 402 on the limiting screw 401 to form an integral structure. Preferably, the locking member 404 is a shoulder hexagonal nut, and a gasket is arranged between the locking member 404 and the positioning assembly 403 to enhance the fastening force of the locking member 404.

[0042] In use, the variable diameter assembly 402 is moved along the axial direction of the limiting screw 401 to the side away from the rotor 100, so that the movable end of the variable diameter assembly 402 can smoothly extend into the inner hole of the center pull rod 200 through the pull rod locking nut 300. When the movable end of the variable diameter assembly 402 reaches the inner threaded position of the inner hole of the center pull rod 200, the limiting screw 401 is pulled away from the rotor 100, so that the variable diameter structure expands the inner hole of the first end of the movable end of the variable diameter assembly 402 to make the outer wall of the movable end of the variable diameter assembly 402 in threaded contact with the inner hole of the center pull rod 200. At this time, the limiting structure at the end of the limiting screw 401 is in axial contact with the movable end of the variable diameter assembly 402. Then, the positioning assembly 403 is moved towards the variable diameter assembly 402, so that the positioning assembly 403 extends into the variable diameter assembly 402 to expand the inner hole of the second end of the movable end of the variable diameter assembly 402, and the positioning assembly 403 and the fixed end of the variable diameter assembly 402 are connected as an anti-rotation structure. Thus, the rotation of the positioning assembly 403 and / or the fixed end of the variable diameter assembly 402 is controlled, so that the movable end of the variable diameter assembly 402 is connected with the threads of the inner hole of the center pull rod 200. Then, the locking member 404 is screwed towards the rotor 100 to abut against the end surface of the positioning assembly 403, so that the positioning assembly 403 and the variable diameter assembly 402 are locked on the limiting screw 401, and the positioning assembly 403 and the variable diameter assembly 402 form an integral structure with the limiting screw 401. Thus, by applying an axial force away from the rotor 100 to the end of the limiting screw 401 away from the rotor 100, the limiting screw 401 can transmit the force to the integral structure through the limiting structure, and the integral structure is fixed through the threaded connection with the inner hole of the center pull rod 200, so that the center pull rod 200 can be pre-tightened by pressing.

[0043] As Figure 1 , Figure 2 and Figure 4As shown, the variable-diameter assembly 402 includes a fixed end and a movable end movably mounted in the fixed end in the radial direction, the fixed end including a support disc 4021 movably mounted on the limiting screw 401 in the axial direction and track blocks 4022 and limiting rods 4023 fixed at both ends of the support disc 4021 respectively, and the movable end including two variable-diameter rings 4024 arranged in a split manner, the two variable-diameter rings 4024 being hoop arranged on the limiting screw 401. A radial gap is left between the central hole of the support disc 4021 and the limiting screw 401, so that the positioning assembly 403 can smoothly extend into the support disc 4021 and contact the inner wall of the variable-diameter ring 4024. Specifically, the second end of the variable-diameter ring 4024 is fixedly connected with a connecting plate, the connecting plate is perpendicular to the axis of the variable-diameter ring 4024 and is arranged in a direction away from the variable-diameter ring 4024, two track blocks 4022 are symmetrically arranged on both sides of the variable-diameter ring 4024, and sliding grooves for accommodating the connecting plate are correspondingly arranged in the two track blocks 4022, so that the variable-diameter ring 4024 realizes radial sliding in the support disc 4021 through the movable cooperation of the connecting plate and the sliding groove. And the sliding groove is arranged in a direction perpendicular to the axis of the variable-diameter ring 4024, which can realize the axial positioning of the connecting plate. Preferably, the sliding groove is arranged in close contact with the end face of the support disc 4021, so that the connecting plate can be in close contact with the end face of the support disc 4021, the area of the sliding guide surface of the connecting plate is increased, and the stability of sliding is improved. Preferably, a positioning pin is arranged on the side of the connecting plate away from the limiting screw 401, the positioning pin protrudes from the end face of the support disc 4021 and is fixed with the support disc 4021, so as to radially position the variable-diameter ring 4024 and prevent it from coming out of the support disc 4021. Optionally, the two ends of the sliding groove are provided with baffles to radially position the connecting plate. The limiting rods 4023 are arranged in two along the circumference of the support disc 4021, the two limiting rods 4023 are inserted into the support disc 4021 in the axial direction, so as to be inserted into the positioning assembly 403 in the axial direction and be circumferentially positioned by clamping with the positioning assembly 403, so as to prevent the positioning assembly 403 and the variable-diameter assembly 402 from rotating relative to each other and ensure their common rotation. Preferably, the positioning pin and the limiting rod 4023 are both cylindrical pins.

[0044] The outer wall of the first end of the variable-diameter ring 4024 is provided with external threads, and the axial length of the external threads is greater than the axial length of the internal threaded section of the central pull rod 200, so as to be threadedly connected with the internal hole of the central pull rod 200. Preferably, the outer wall of the variable-diameter ring 4024 is provided with a scale line, so as to determine whether the variable-diameter ring 4024 reaches the threaded position of the internal hole of the central pull rod 200, that is, when the variable-diameter ring 4024 extends into the internal hole of the central pull rod 200 along with the limiting screw 401 into the internal hole of the central pull rod 200, and the scale line on the variable-diameter ring 4024 coincides with the upper end face of the pull rod locking nut 300, it indicates that the variable-diameter ring 4024 has reached the threaded position of the central pull rod 200.

[0045] As shown in FIG. 6, the variable-diameter assembly 402 is arranged in the variable-diameter hole 201 of the centering assembly 403, and the variable-diameter ring 4024 is arranged in the variable-diameter hole 201 of the centering assembly 403 in the radial direction. Figure 1 and Figure 2As shown, the positioning assembly 403 comprises an inner expanding sleeve 4031 and a positioning disc 4032, the inner expanding sleeve 4031 is movably sleeved on the limiting screw 401 in the axial direction, and the positioning disc 4032 is annularly arranged outside the inner expanding sleeve 4031 and fixedly connected with the inner expanding sleeve 4031 to axially limit the inner expanding sleeve 4031. The inner expanding sleeve 4031 protrudes from the positioning disc 4032 towards the variable-diameter assembly 402, and the length of the inner expanding sleeve 4031 protruding from the positioning disc 4032 is greater than the thickness of the supporting disc 4021, so that the inner expanding sleeve 4031 can extend into the variable-diameter ring 4024 to support the inner hole of the second end of the variable-diameter ring 4024. The positioning disc 4032 is axially provided with an anti-rotation groove corresponding to the position of the limiting rod 4023, for axially inserting the limiting rod 4023 to circumferentially position the positioning assembly 403, prevent relative rotation between the positioning assembly 403 and the variable-diameter assembly 402, and ensure common rotation.

[0046] As shown in Figure 1 and Figure 2 , the limiting screw 401 comprises a limiting structure, a variable-diameter structure and a guide section 4011 arranged in sequence in the axial direction, the variable-diameter structure comprises a tensioning section 4012 and a conical transition section 4013, the outer diameter of the tensioning section 4012 is greater than the outer diameter of the guide section 4011, so that the first end of the variable-diameter ring 4024 can be expanded by the tensioning section 4012, and the outer wall of the expanded variable-diameter ring 4024 is in contact with the inner hole wall of the center pull rod 200. The tensioning section 4012 and the guide section 4011 are transitioned by the conical transition section 4013 to ensure the stability of the tensioning section 4012 expanding the variable-diameter ring 4024. The limiting structure adopts a limiting boss 4014, the outer diameter of the limiting boss 4014 is greater than the maximum outer diameter of the variable-diameter ring 4024 clamped on the tensioning section 4012, so as to axially limit the variable-diameter ring 4024, and the outer diameter of the limiting boss 4014 is less than the minimum inner diameter of the pull rod locking nut 300, so that the limiting screw 401 can extend into the pull rod locking nut 300 to reach the inner hole of the center pull rod 200. Preferably, the limiting boss 4014 adopts a cylindrical structure, which can guide and roughly position the penetration of the limiting screw 401 in the center pull rod 200.

[0047] As shown in Figure 1 and Figure 3As shown, the pressure mechanism 500 comprises a support sleeve 501, a hydraulic device 502 and a fixing assembly 503 which are sequentially sleeved outside the variable-diameter clamp 400 in the axial direction. The fixing assembly 503 is arranged at the end of the variable-diameter clamp 400 away from the rotor 100 and is threadedly connected with the limiting screw 401, for pressing the support sleeve 501 and the hydraulic device 502 against the end surface of the rotor 100. Specifically, the hydraulic device 502 comprises a hydraulic cylinder outer ring and a hydraulic cylinder inner ring. The hydraulic cylinder outer ring is clamped with the support sleeve 501 in the axial direction, and the hydraulic cylinder inner ring is fixed with the limiting screw 401, for exerting an axial pulling force on the fixing assembly 503 in the direction away from the rotor 100, so as to exert an axial pre-tightening force on the center pull rod 200 through the cooperation of the fixing assembly 503 and the limiting screw 401. The hydraulic cylinder outer ring is sleeved outside the hydraulic cylinder inner ring, and the side edge of the hydraulic cylinder outer ring is provided with a hydraulic interface connected with the hydraulic equipment. Thus, by connecting the hydraulic equipment with the hydraulic interface, the hydraulic cylinder inner ring and the hydraulic cylinder outer ring can be relatively moved in the axial direction, so as to realize the pressing of the center pull rod 200. The hydraulic device 502 is used to exert the force, which can meet the axial force requirement of the center pull rod 200, and the hydraulic pressure is relatively stable, thereby improving the pressing efficiency and stability.

[0048] As shown in Figure 1 and Figure 3 , the support sleeve 501 is a funnel-shaped structure with openings at the top and bottom. When installed, the end with the larger opening is placed towards the rotor 100. This structure has strong stability and can maintain good structural stability when the pressure mechanism 500 exerts a large force, and ensures that the force direction is coaxial with the center pull rod 200. The side edge of the support sleeve 501 is also provided with an opening, which is arranged at the lower end of the support seat to allow the pull rod locking nut 300 to pass through, so that the torque wrench 600 can be extended through the side edge opening. This facilitates the pre-tightening of the pull rod locking nut 300 by the torque wrench 600 from the outside of the support seat, and ensures that the pull rod locking nut 300 is tightly attached to the end surface of the rotor 100 boss.

[0049] As shown in Figure 1 and Figure 3 , the fixing assembly 503 comprises a pre-tightening nut 5031 and a pressing plate 5032 arranged between the pre-tightening nut 5031 and the hydraulic device 502. The pre-tightening nut 5031 is threadedly connected with the limiting screw 401 to press the pressing plate 5032 against the inner ring of the hydraulic cylinder, and the inner ring of the hydraulic cylinder is fixed with the limiting screw 401, so that the inner ring of the hydraulic cylinder can control the pressing plate 5032 and the limiting screw 401 to exert an axial pulling force on the center pull rod 200 in the direction away from the rotor 100 to press the center pull rod 200. Preferably, the pre-tightening nut 5031 is a shoulder hexagonal nut, and a gasket is arranged between the pre-tightening nut 5031 and the pressing plate 5032 to enhance the fastening force of the pre-tightening nut 5031.

[0050] As shown in Figure 1 and Figure 5As shown, the torque wrench 600 comprises a wrench ring 601 and a handle 602 fixed on the wrench ring 601, the inner diameter of the wrench ring 601 is matched with the outer diameter of the pull rod locking nut 300 to clamp the pull rod locking nut 300, and a clamping groove 6011 is arranged on the inner wall of the wrench ring 601 and used for clamping connection with the pull rod locking nut 300. Specifically, the anti-rotation boss is arranged on the pull rod locking nut 300 in the circumferential direction, and the clamping groove 6011 on the wrench ring 601 is arranged in correspondence with the anti-rotation boss, the circumferential positioning of the wrench ring 601 and the pull rod locking nut 300 is realized through the clamping of the clamping groove 6011 and the anti-rotation boss, the relative sliding between the torque wrench 600 and the pull rod locking nut 300 in the rotating process is prevented, and the damage to the surrounding parts is avoided. The anti-rotation boss of the tightened pull rod locking nut 300 is aligned with any hole of the rotor 100 mounting edge.

[0051] In addition, the present application also discloses a method for pressing the compressor rotor 100, which adopts the above-mentioned compressor rotor pressing device and comprises the following steps:

[0052] S1: the center pull rod 200 is arranged in the rotor 100 in the axial direction, the distance AP between the upper end surface of the center pull rod 200 and the upper end surface of the rotor 100 disc is measured and recorded, the pull rod locking nut 300 is sleeved on the upper end of the center pull rod 200 to press the upper end surface of the boss of the rotor 100, the torque wrench 600 is sleeved outside the pull rod locking nut 300 to be clamped with the pull rod locking nut 300, the torque is applied to the torque wrench 600 to tighten the pull rod locking nut 300, and the axial gap between the tightened pull rod locking nut 300 and the upper end surface of the boss of the rotor 100 is checked by using a feeler gauge, so that the axial gap is greater than 0.02 thickness;

[0053] S2: the variable-diameter clamp 400 is inserted into the pull rod locking nut 300 in the axial direction, and is fixed as a whole with the inner hole thread of the center pull rod 200. Specifically, the variable-diameter assembly 402 is lifted to make the variable-diameter ring 4024 in the closed loop state and be clamped on the guide section 4011 of the limiting screw 401, the variable-diameter ring 4024 in the closed loop state is arranged in the inner hole of the center pull rod 200 together with the limiting screw 401, when the mark line on the variable-diameter ring 4024 is flush with the top end of the pull rod locking nut 300, it indicates that the external thread on the variable-diameter ring 4024 has reached the inner thread of the inner hole of the center pull rod 200 completely;

[0054] Then the limiting screw 401 is lifted to move towards the direction away from the rotor 100, and the limiting boss 4014 is axially attached to the end surface of the variable diameter ring 4024, and the positioning assembly 403 is inserted into the support disc 4021 along the axial direction to extend into the variable diameter ring 4024, so that the first end and the second end of the inner hole of the variable diameter ring 4024 are respectively supported by the variable diameter structure of the limiting screw 401 and the inner expanding sleeve 4031 of the positioning assembly 403, so that the outer thread of the first end of the variable diameter ring 4024 after being supported is in abutment with the inner thread of the center pull rod 200, and the variable diameter assembly 402 forms a circumferentially relatively static structure with the positioning assembly 403 through the limiting rod 4023, and the support disc 4021 is rotated to connect and fix the variable diameter ring 4024 with the center pull rod 200 through the outer thread and the inner thread, and the distance L between the upper end surface of the support disc 4021 and the upper end surface of the rotor 100 is measured, so that L=(80+AP)±0.6, which means that the variable diameter clamp 400 has been installed in place.

[0055] S3: The pressure mechanism 500 is sleeved outside the variable diameter clamp 400 to be fixed with the variable diameter clamp 400 and abutted with the end surface of the rotor 100, the pressure mechanism 500 is controlled to apply axial pressure to the rotor 100, and the variable diameter clamp 400 is clamped to apply axial tension away from the rotor 100, so that the center pull rod 200 is synchronously stressed with the variable diameter clamp 400.

[0056] Specifically, the support sleeve 501 is sleeved outside the variable diameter clamp 400 to cover the upper end surface of the rotor 100, the hydraulic cylinder 502 is installed above the support sleeve 501, the hydraulic cylinder outer ring is axially clamped with the support sleeve 501, the hydraulic cylinder inner ring is fixed with the limiting screw 401, and then the fixing assembly 503 is screwed on the limiting screw 401 to press the hydraulic cylinder inner ring.

[0057] The oil pipe between the hydraulic interface and the hydraulic equipment is connected, the hydraulic valve is opened, and the hydraulic cylinder inner ring and the hydraulic cylinder outer ring are relatively displaced along the axial direction to tension the center pull rod 200.

[0058] S4: When the axial force of the center pull rod 200 reaches the preset range, the torque wrench 600 is controlled to apply torque to the pull rod lock nut 300 for pre-tightening to lock the center pull rod 200 and the rotor 100, and then the hydraulic cylinder 502 is depressurized, so that the center pull rod 200 is completed. The tensioning. In turn, the fixing assembly 503, the pressure mechanism 500, the variable diameter clamp 400 and the torque wrench 600 are removed, and the assembly of the compressor rotor 100 is completed.

[0059] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A pressurizing device for disassembling and assembling a compressor rotor assembly, the compressor rotor assembly comprising a rotor (100), a center pull rod (200) axially penetrating a center hole of the rotor (100), and a pull rod locking nut (300) sleeved on the center pull rod (200) for pressing the rotor (100), characterized in that, The compressor rotor pressing device comprises: A variable-diameter clamp (400) with an outer diameter that can be tightened and adjusted, which is used to be screwed with the inner hole of the center pull rod (200) along the axial direction through the pull rod locking nut (300), so as to clamp and fix the center pull rod (200); A pressure mechanism (500) installed on the variable-diameter clamp (400) and used to abut against the rotor (100), and also used to apply axial pressure to the rotor (100) and axial tension to the variable-diameter clamp (400) in a direction away from the rotor (100), so that the axial force of the center pull rod (200) reaches a preset range; A torque wrench (600) used to be clamped on the pull rod locking nut (300) and apply torque to the pull rod locking nut (300), so as to lock the center pull rod (200) with axial force reaching the preset range; The variable-diameter clamp (400) comprises a limiting screw (401), a variable-diameter assembly (402), a positioning assembly (403) and a locking piece (404) which are sequentially sleeved on the limiting screw (401) along the axial direction, and the variable-diameter assembly (402) is movably clamped on the limiting screw (401); The limiting screw (401) is provided with a variable-diameter structure at an end away from the locking piece (404), the first end of the variable-diameter assembly (402) is used to be driven by the variable-diameter structure to radially tighten and clamp the inner hole of the center pull rod (200), the positioning assembly (403) movably cooperates with the limiting screw (401), and the positioning assembly (403) is used to be inserted into the second end of the variable-diameter assembly (402) along the axial direction to circumferentially limit and change the diameter of the second end of the variable-diameter assembly (402); The locking piece (404) is screwed with the limiting screw (401) to lock the positioning assembly (403) and the variable-diameter assembly (402) on the limiting screw (401).

2. The compressor rotor pressing device according to claim 1, wherein The variable-diameter assembly (402) comprises a support disc (4021) movably penetrating the limiting screw (401) along the axial direction, track blocks (4022) and limiting rods (4023) fixed at the axial two ends of the support disc (4021) respectively, and a variable-diameter ring (4024) movably installed in the track blocks (4022) along the radial direction, the limiting rods (4023) are arranged at an end of the support disc (4021) away from the rotor (100) and used to be clamped with the positioning assembly (403) to limit the circumferential rotation thereof; The variable-diameter ring (4024) is used to move along the track blocks (4022), and the outer wall of an end of the variable-diameter ring (4024) away from the support disc (4021) is provided with external threads for screwing with the inner hole of the center pull rod (200).

3. The compressor rotor pressing device according to claim 2, wherein The positioning assembly (403) comprises an inner expanding sleeve (4031) movably sleeved on the limiting screw rod (401) in the axial direction and a positioning disc (4032) annularly arranged outside the inner expanding sleeve (4031) and fixedly connected with the inner expanding sleeve (4031), the positioning disc (4032) is provided with anti-rotation grooves corresponding to the limiting rods (4023) and used for allowing the limiting rods (4023) to pass through in the axial direction. The inner expanding sleeve (4031) is arranged towards the variable-diameter assembly (402) and is inserted into the second end of the variable-diameter ring (4024) in the axial direction to expand the inner hole of the variable-diameter ring (4024).

4. The compressor rotor pressing device according to claim 2, characterized in that, The limiting screw rod (401) comprises a guide section (4011) movably connected with the variable-diameter assembly (402) and the positioning assembly (403) in the axial direction, an expanding section (4012) used for expanding the inner hole of the variable-diameter ring (4024) to abut against the inner wall of the center pull rod (200), a tapered transition section (4013) arranged between the guide section (4011) and the expanding section (4012), and a limiting boss (4014) arranged on the side of the expanding section (4012) away from the guide section (4011) and used for axially limiting the variable-diameter ring (4024), the outer diameter of the limiting boss (4014) is smaller than the minimum inner diameter of the pull rod locking nut (300), and the tapered transition section (4013) and the expanding section (4012) jointly form the variable-diameter structure.

5. The compressor rotor pressing device according to claim 1, characterized in that, The pressure mechanism (500) comprises a support sleeve (501), a hydraulic device (502) and a fixing assembly (503) sequentially sleeved outside the variable-diameter clamp (400) in the axial direction, the fixing assembly (503) is arranged at the end of the variable-diameter clamp (400) away from the rotor (100) and is threadedly connected with the limiting screw rod (401), and is used for pressing the support sleeve (501) and the hydraulic device (502) against the end surface of the rotor (100); The hydraulic device (502) is axially connected with the support sleeve (501) and is fixedly connected with the limiting screw rod (401), and is used for applying an axial tension to the fixing assembly (503) in the direction away from the rotor (100), so that the center pull rod (200) is axially pre-tightened through the cooperation of the fixing assembly (503) and the limiting screw rod (401).

6. The compressor rotor pressing device according to claim 5, characterized in that, An opening is formed in the side edge of the support sleeve (501) and is used for allowing the operating end of the torque wrench (600) to extend out.

7. The compressor rotor pressing device according to claim 5, characterized in that, The fixing assembly (503) comprises a pre-tightening nut (5031) and a pressing plate (5032) arranged between the pre-tightening nut (5031) and the hydraulic device (502), the pre-tightening nut (5031) is threadedly connected with the limiting screw rod (401) and is used for pressing the pressing plate (5032) on the hydraulic device (502).

8. The compressor rotor pressing device according to claim 1, characterized in that, The torque wrench (600) comprises a wrench ring (601) for being clamped outside the pull rod locking nut (300) and a handle (602) fixed to the wrench ring (601), and the inner wall of the wrench ring (601) is provided with a clamping groove (6011) for clamping the pull rod locking nut (300).

9. A method of pressurizing a compressor rotor using the pressurizing device for a compressor rotor according to any one of claims 1 to 8, characterized by, The method comprises the following steps: S1: the center pull rod (200) is axially arranged in the rotor (100), the pull rod locking nut (300) is arranged outside the center pull rod (200) to press the end face of the rotor (100), and the torque wrench (600) is arranged outside the pull rod locking nut (300) to be clamped with the pull rod locking nut (300); S2: the variable-diameter clamp (400) is axially inserted into the pull rod locking nut (300) and is fixedly connected with the inner hole of the center pull rod (200) in a threaded manner; S3: the pressure mechanism (500) is arranged outside the variable-diameter clamp (400) to be fixed with the variable-diameter clamp (400) and abut against the end face of the rotor (100), the pressure mechanism (500) is controlled to apply an axial pressure to the rotor (100), and the variable-diameter clamp (400) is clamped to apply an axial tension to the variable-diameter clamp (400) away from the rotor (100), so that the center pull rod (200) is synchronously stressed with the variable-diameter clamp (400); S4: when the axial force of the center pull rod (200) reaches a preset range, the torque wrench (600) is controlled to apply a torque to the pull rod locking nut (300) to lock the center pull rod (200) and the rotor (100), so that the pull-press assembly of the rotor (100) is completed.

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