Fan shaft simulation device and measurement method of two-stage fan impeller

Abstract

The application discloses a fan shaft simulation device and a measuring method of a two-stage fan impeller, and belongs to the fan impeller measuring field. The application provides a fan shaft simulation device and a measuring method of a two-stage fan impeller, adopts an asymmetric supporting structure to realize the centering of a two-stage fan wheel disc, completes the positioning of an integral ring structure casing on the same side, and simultaneously satisfies the requirements of fan unit body measurement in a horizontal state and bearing clearance elimination. The simulation device with the fan shaft can be connected to a turnover frame to realize the overall turnover function, satisfies the process of vertical assembly-horizontal measurement, and is safer and more reasonable for the assembly of the rotor and the casing; the assembly can eliminate the bearing axial clearance on the simulation device, and the top tool does not need to be newly manufactured and arranged; the simulation device with the fan shaft becomes an integrated device after the first assembly and detection, is easy to maintain, can be repeatedly used for component assembly, and indirectly saves the assembly period.

Description

Technical Field

[0001] This invention belongs to the field of fan impeller measurement, and in particular to a fan shaft simulation device and a measurement method for a two-stage fan impeller. Background Technology

[0002] Previously, during final assembly, a certain type of engine used rear-end parts for positioning to measure fan-stator clearance and blade tip runout in the assembled state. Due to a change in drawing hierarchy, the newly issued fan unit drawings only include two stages of rotor disks and a two-stage ring-structure casing; the unit does not include the rotating shaft and rotating bearing. According to the design requirements, the fan unit must be able to measure fan-stator clearance and blade tip runout in a horizontal state after assembly. The traditional process design using a dual-support simulated shaft at the front and rear ends fails to meet the requirements for measurement reference conversion, resulting in deviations from the overall engine structure and potentially inaccurate measurement data. Furthermore, the dual-support simulated shaft makes the ring-structure casing difficult to install and disassemble, leading to poor manufacturability. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a fan shaft simulation device and a method for measuring a two-stage fan impeller.

[0004] To achieve the above objectives, the present invention employs the following technical solution:

[0005] A fan shaft simulation device with a cantilever structure includes a fan shaft positioning ring, a fan simulation shaft is provided inside the fan shaft positioning ring, a roller bearing is provided around the lower end of the fan simulation shaft, an outer ring clamping nut is provided on the roller bearing, and an inner ring clamping nut and an axial adjuster are provided inside the roller bearing.

[0006] The upper end of the fan simulation shaft is provided with a ball bearing, which is fixed by a ball bearing pressure ring, connecting bolts and a clamping nut.

[0007] The bottom of the fan shaft positioning ring is provided with a base, and the periphery of the fan shaft positioning ring is provided with a positioning support plate, which is located on the base; the base is also provided with a simulated flow divider housing positioning block.

[0008] Furthermore, the simulated shunt casing positioning block is fixed to the base via connecting bolts between the base and the simulated casing.

[0009] Furthermore, a support plate is provided between the positioning block of the simulated flow divider casing and the base.

[0010] Furthermore, a pressure ring is provided at the top of the fan shaft positioning ring.

[0011] Furthermore, the top of the simulated diversion casing positioning block is equipped with simulation device connecting bolts and washers to the casing.

[0012] Furthermore, the inner steel ring of the roller bearing and the journal, and the outer steel ring and the bearing housing are both interference fits; or / and

[0013] The inner steel ring of a ball bearing is fitted to the journal, and the outer steel ring is fitted to the housing; both are interference fits.

[0014] Furthermore, the outer circumference of the base is provided with flange holes.

[0015] A method for measuring a two-stage fan impeller includes the following steps:

[0016] (1) The fan shaft simulation device of the cantilever structure described in this invention is connected to the base of the rotating assembly frame through the flange hole on the outer circle to realize the flipping function;

[0017] (2) Flip the fan shaft simulation device of the cantilever structure described in this invention to a vertical state, install the secondary fan wheel and the secondary fan casing in sequence, use the connector to complete the positioning of the rotor and stator, and then flip the simulation device with the secondary fan wheel and the secondary fan casing installed, and measure the runout of the secondary rotor blade tip and the clearance value of the rotor stator in sequence.

[0018] (3) Flip the simulation device described in this invention to a vertical position, install the first-stage fan disk on the second-stage fan disk, stack the air intake and the first-stage fan casing on the second-stage fan casing, use the connector to complete the positioning of the rotor and stator, and then flip the simulation device to measure the runout of the first-stage rotor blade tip and the clearance value of the rotor stator in sequence.

[0019] Furthermore, step (1) includes the following prior to:

[0020] The coaxiality and concentricity of the fan shaft simulation device of the cantilever structure described in this invention are measured.

[0021] Furthermore, step (3) is followed by:

[0022] Calculate the machining allowance based on the measurement results, and perform additional machining on the corresponding allowance at the mating position. Repeat steps (2) to (3) until the mating clearance requirements are met.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] This invention provides a fan shaft simulation device and a measurement method for two-stage fan impellers. An asymmetrical support structure is used to center the two-stage fan impellers, and the entire ring casing is positioned on the same side. This simultaneously meets the requirements for horizontal measurement of the fan unit and elimination of bearing clearance. The simulation device with the fan shaft can be transferred to a tilting frame to achieve overall tilting, satisfying the vertical assembly-horizontal measurement process. This makes the assembly of the rotor and casing safer and more efficient. Assembly can eliminate axial bearing clearance on the simulation device without remanufacturing and installing mounting fixtures. The simulation device with the fan shaft becomes a single unit after initial assembly and testing, simplifying maintenance. The components can be reused, indirectly saving assembly time.

[0025] This invention provides a measurement method for a two-stage fan impeller, which can realize rotor rotation, eliminate axial clearance, and complete the measurement of rotor-stator clearance and blade tip runout in a horizontal state, ensuring high assembly and measurement accuracy. Attached Figure Description

[0026] Figure 1 This is a structural diagram of a fan shaft simulation device with a cantilever structure;

[0027] Figure 2 This is a top view of a fan shaft simulation device with a cantilever structure;

[0028] Figure 3 This is a schematic diagram of a fan's simulated shaft;

[0029] Figure 4 This is a schematic diagram of the outer ring clamping nut and axial adjuster of the roller bearing.

[0030] Wherein: 1-Simulated flow divider housing positioning block; 2-Fan shaft positioning ring; 3-Positioning support plate; 4-Pressure ring; 5-Base; 6-Support plate; 7-Ball bearing pressure ring and connecting bolt; 8-Simulated device and housing connection bolt; 9-Base and simulated housing connection bolt; 10-Washer; 11-Ball bearing; 12-Fan simulated shaft; 13-Roller bearing; 14-Inner ring clamping nut and axial adjuster. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0033] The present invention will now be described in further detail with reference to the accompanying drawings:

[0034] Example 1

[0035] This invention provides a fan shaft simulation device with a cantilever structure. It employs an asymmetrical support structure to center the two-stage fan discs, achieving the positioning of the entire ring casing on the same side, while simultaneously meeting the requirements for horizontal measurement of the fan unit and elimination of bearing clearance. The cantilever fan shaft simulation device of this invention is implemented through the following steps:

[0036] Design of fan unit cantilever support scheme: Based on the structural characteristics of the cantilever rotor fan unit, design a fan shaft simulation device with cantilever structure, and at the same time design a fan shaft positioning base - simulation splitter casing. The combined simulation device is required to realize the layer-by-layer assembly and individual measurement of the fan from single stage to two stages.

[0037] Manufacturing simulation device and selecting process bearings: Based on the characteristics of the cantilever fan unit and the support layout in the overall engine structure, a support scheme for the fan cantilever structure simulation shaft with ball bearings at the first support point and roller bearings at the second support point is selected. Bearings of the same level as the engine main bearings are selected to ensure that the positioning effect of the simulation device is consistent with the overall engine assembly state to the greatest extent.

[0038] See Figure 1 and Figure 2 The present invention provides a fan shaft simulation device with a cantilever structure, including a simulated splitter casing positioning block 1, a fan shaft positioning ring 2, a positioning support plate 3, a pressure ring 4, a base 5, a support plate 6, a ball bearing pressure ring and connecting bolts 7, a simulation device and casing connecting bolts 8, a base and simulated casing connecting bolts 9, a washer 10, a ball bearing and clamping nut 11, a fan simulated shaft 12, a roller bearing 13, and an inner ring clamping nut and an axial adjuster 14;

[0039] The fan shaft positioning ring 2 houses a fan simulation shaft 12. A roller bearing 13 surrounds the lower end of the fan simulation shaft 12. An outer ring clamping nut is mounted on the roller bearing 13, and an inner ring clamping nut and an axial adjuster 14 are located inside the roller bearing 13. A ball bearing 11 is mounted on the upper end of the fan simulation shaft 12. The ball bearing 11 is fixed by a ball bearing clamping ring, connecting bolts 7, and clamping nuts. A base 5 is located at the bottom of the fan shaft positioning ring 2, and a positioning support plate 3 is located around the fan shaft positioning ring 2, situated on the base 5. A simulation splitter housing positioning block 1 is also fixed to the base 5 via base-to-simulation housing connecting bolts 9. A support plate 6 is mounted on the simulation splitter housing positioning block 1. A clamping ring 4 is located at the top of the fan shaft positioning ring 2. A simulation device-to-housing connecting bolt 8 and a washer 10 are located at the top of the simulation splitter housing positioning block 1.

[0040] The lower end of the fan simulation shaft 12 has a roller bearing 13 forming the first fulcrum, and the upper end of the fan simulation shaft 12 has a ball bearing 11 forming the second fulcrum. This invention uses an asymmetrical support structure to achieve centering of the two-stage fan disc.

[0041] The simulated splitter casing acts as a centering and cantilever support for the simulated fan shaft. At the same time, the structure of the stop and precision screw holes enables the centering and axial and radial positioning of the fan casing.

[0042] This invention provides an implementation method for a fan-simulated shaft, as detailed below:

[0043] See Figure 3 , Figure 3 This is a schematic diagram of a fan simulation shaft; the simulation shaft realizes the cantilever support function and provides a reliable, high-precision positioning reference for the fan blade disk.

[0044] This invention provides an embodiment of a roller bearing outer ring clamping nut and an axial adjuster, as detailed below:

[0045] See Figure 4 , Figure 4 This is a schematic diagram of the roller bearing outer ring clamping nut and axial adjuster; while clamping the bearing steel ring, this part has six centrally symmetrical threaded holes. On the assembled simulation device, the axial clearance of the cantilever fan rotor can be eliminated by using bolts and the reserved threaded holes.

[0046] Example 2

[0047] This invention provides an assembly simulation method for a cantilever fan rotor, comprising the following steps:

[0048] Assembly and testing simulation device:

[0049] Assemble the simulated splitter housing positioning block 1, the simulated fan shaft 12, and the bearings at the two support points; to meet the bearing support accuracy of the shaft, the inner steel ring of the bearing and the journal, and the outer steel ring of the bearing and the bearing housing are interference fits, requiring freeze / heat assembly; after assembly, measure the coaxiality, concentricity, and other dimensions of the simulated device; connect the assembled and measured simulated device to the base of the rotating assembly frame through the flange hole on the outer circle to achieve the flipping function;

[0050] Installation and measurement of the secondary casing and secondary fan impeller

[0051] The simulation device was flipped to a vertical position, and the secondary fan wheel and secondary fan casing were installed in sequence. The rotor and stator were positioned using the process connectors. Then the simulation device with the secondary fan wheel and secondary fan casing was flipped, and the runout of the secondary rotor blade tip and the clearance value of the rotor and stator were measured in sequence.

[0052] Installation and measurement of the first-stage casing and first-stage fan impeller

[0053] The simulation device is flipped to a vertical position. The first-stage fan disc is installed on the second-stage fan disc. The air intake and the first-stage fan casing are stacked on the second-stage fan casing. The rotor and stator are positioned using process connectors. Then the simulation device containing the parts is flipped over, and the runout of the first-stage rotor blade tip and the clearance value of the rotor and stator are measured in sequence.

[0054] Disassembly of the casing and impeller

[0055] After completing the measurement work, remove the two-stage fan wheel, the second-stage fan casing, the air intake, and the fan casing from the simulation device;

[0056] Calculate the machining allowance based on the measurement results, return the two-stage fan casing to the main manufacturing workshop, and perform additional machining on the corresponding allowance at the mating position to meet the mating clearance requirements. Repeat the steps after completing the additional machining until the mating clearance requirements are met.

[0057] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A fan shaft simulation device with a cantilever structure, characterized in that, Includes a fan shaft positioning ring (2), a fan simulation shaft (12) is provided inside the fan shaft positioning ring (2), a roller bearing (13) is provided around the lower end of the fan simulation shaft (12), an outer ring clamping nut is provided on the roller bearing (13), and an inner ring clamping nut and an axial adjuster (14) are provided inside the roller bearing (13). The upper end of the fan simulation shaft (12) is provided with a ball bearing (11), which is fixed by a ball bearing pressure ring, connecting bolts (7) and a clamping nut; The bottom of the fan shaft positioning ring (2) is provided with a base (5), and the periphery of the fan shaft positioning ring (2) is provided with a positioning support plate (3), which is located on the base (5); the base (5) is also provided with a simulated flow divider housing positioning block (1).

2. The fan shaft simulation device with cantilever structure according to claim 1, characterized in that, The simulated shunt casing positioning block (1) is fixed to the base (5) by the base and the simulated casing connecting bolt (9).

3. The fan shaft simulation device with cantilever structure according to claim 2, characterized in that, A support plate (6) is provided between the positioning block (1) of the simulated flow divider and the base (5).

4. The fan shaft simulation device with cantilever structure according to claim 1, characterized in that, A pressure ring (4) is provided on the top of the fan shaft positioning ring (2).

5. The fan shaft simulation device with cantilever structure according to claim 1, characterized in that, The top of the simulation shunt casing positioning block (1) is provided with simulation device connecting bolts (8) and washers (10).

6. The fan shaft simulation device with cantilever structure according to claim 1, characterized in that, The inner steel ring of the roller bearing (13) is fitted with the journal, and the outer steel ring is fitted with the housing; or / and The inner steel ring of the ball bearing (11) is fitted with the journal, and the outer steel ring is fitted with the housing. All fits are interference fits.

7. The fan shaft simulation device with cantilever structure according to claim 1, characterized in that, The outer circle of the base (5) has a flange hole.

8. A method for measuring the two-stage fan impeller of a fan shaft simulation device with a cantilever structure according to any one of claims 1-7, characterized in that, Includes the following steps: (1) Connect the fan shaft simulation device of the cantilever structure to the base of the rotating assembly frame through the flange hole on the outer circle to realize the flipping function; (2) Flip the fan shaft simulation device with cantilever structure to the vertical position, install the secondary fan wheel and the secondary fan casing in sequence, use the connector to complete the positioning of the rotor and stator, and then flip the simulation device with the secondary fan wheel and the secondary fan casing, and measure the runout of the secondary rotor blade tip and the clearance value of the rotor stator in sequence. (3) Turn the simulation device to a vertical position, install the first-stage fan wheel on the second-stage fan wheel, stack the air intake and the first-stage fan casing on the second-stage fan casing, use the connector to complete the positioning of the rotor and stator, and then turn the simulation device over to measure the runout of the first-stage rotor blade tip and the clearance value of the rotor stator in sequence.

9. The method for measuring a two-stage fan impeller according to claim 8, characterized in that, Step (1) includes the following: A fan shaft simulation device with a cantilever structure was used to measure coaxiality and concentricity.

10. The method for measuring a two-stage fan impeller according to claim 8, characterized in that, Step (3) is followed by: (4) Calculate the machining allowance according to the measurement results, and perform additional machining on the corresponding allowance at the mating position. Repeat steps (2) to (3) until the mating clearance requirements are met.

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