CN117489414A - Rotor core of expander, first assembling method and repeated assembling detection method - Google Patents

Rotor core of expander, first assembling method and repeated assembling detection method Download PDF

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Publication number
CN117489414A
CN117489414A CN202311339035.3A CN202311339035A CN117489414A CN 117489414 A CN117489414 A CN 117489414A CN 202311339035 A CN202311339035 A CN 202311339035A CN 117489414 A CN117489414 A CN 117489414A
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CN
China
Prior art keywords
main shaft
pull rod
cylindrical guide
impeller
section
Prior art date
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Pending
Application number
CN202311339035.3A
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Chinese (zh)
Inventor
康少博
邵广军
李亚康
陈志强
许建忠
张坤
许俊伟
邢鹤琛
王政森
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Zheng Ji Suo Zhengzhou Transmission Technology Co ltd
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Zheng Ji Suo Zhengzhou Transmission Technology Co ltd
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Application filed by Zheng Ji Suo Zhengzhou Transmission Technology Co ltd filed Critical Zheng Ji Suo Zhengzhou Transmission Technology Co ltd
Priority to CN202311339035.3A priority Critical patent/CN117489414A/en
Publication of CN117489414A publication Critical patent/CN117489414A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/02—Blade-carrying members, e.g. rotors
    • F01D5/025—Fixing blade carrying members on shafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P21/00—Machines for assembling a multiplicity of different parts to compose units, with or without preceding or subsequent working of such parts, e.g. with programme control
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M1/00—Testing static or dynamic balance of machines or structures
    • G01M1/14—Determining imbalance
    • G01M1/16—Determining imbalance by oscillating or rotating the body to be tested

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

The invention relates to the technical field of turbine expanders, and discloses a rotor core of an expander, a first assembling method and a repeated assembling detection method thereof, wherein the rotor core of the expander comprises a main shaft, a pull rod and an impeller, a connecting end of the main shaft and the impeller are matched and centered through conical surfaces, an internal threaded hole and a cylindrical guide hole are coaxially arranged in the main shaft, the cylindrical guide hole is positioned between the internal threaded hole and the end face of the connecting end of the main shaft, an external threaded section and a cylindrical guide section are coaxially arranged on an extending section of the pull rod, the extending section of the pull rod extends into the main shaft, the external threaded section of the pull rod is matched with the internal threaded hole of the main shaft in a threaded manner, the cylindrical guide section of the pull rod is matched with the cylindrical guide hole of the main shaft in a transition manner or a clearance manner, the exposed section of the pull rod penetrates through the impeller, and the exposed section of the pull rod is clamped with the impeller in a coaxial locking nut or bolt manner. The invention adds a pair of guide structures such as the cylindrical guide hole and the cylindrical guide section, and can greatly avoid the problem that the axle center of the pull rod and the axle center of the main shaft are easy to deviate greatly.

Description

Rotor core of expander, first assembling method and repeated assembling detection method
Technical Field
The invention relates to the technical field of turbine expanders, in particular to a rotor core of an expander, a first assembling method and a repeated assembling detection method thereof.
Background
The main shaft and the impeller are basic core parts of the rotor of the expander, so the dynamic balance precision of the rotor is basically determined by the main shaft and the impeller which are independent parts and the dynamic balance precision of the two parts after being connected and fixed. The connection between the main shaft and the impeller is fixed in various forms, wherein the most main and reliable connection structure is fixed by connecting through a pull rod and a nut or a bolt. However, the length of the pull rod is large, and the manufacturing precision of the screw thread pair is relatively low, so that after the existing pull rod is in threaded fit connection with the spindle, the axle center of the pull rod and the axle center of the spindle are easy to deviate greatly, the dynamic balance precision of the rotor is greatly affected, and the dynamic balance precision of the rotor sometimes cannot meet the requirement.
In addition, since the existing assembly process is rough, although the dynamic balance accuracy of each independent part meets the requirement, the dynamic balance accuracy after assembling part or all parts of the rotor may not meet the requirement. And because of structural factors, part or all parts of the rotor need to be repeatedly assembled, and the prior art does not have a finer and standardized method for repeated assembly operation, so that the dynamic balance precision of the rotor and the dynamic balance precision after repeated assembly are easy to be kept and the stability of the expander is poor.
Disclosure of Invention
The invention provides a rotor core of an expander, a first assembling method and a repeated assembling detection method thereof for overcoming the defects in the prior art. The invention achieves the above object by the following technical scheme.
The rotor core of the expander comprises a main shaft, a pull rod and an impeller, wherein the connecting end of the main shaft and the impeller are centered through conical surface matching, an internal threaded hole and a cylindrical guide hole are coaxially arranged in the main shaft, the cylindrical guide hole is positioned between the internal threaded hole and the end face of the connecting end of the main shaft, an external threaded section and a cylindrical guide section are coaxially arranged on an extending section of the pull rod, the extending section of the pull rod extends into the main shaft, the external threaded section of the pull rod is in threaded fit with the internal threaded hole of the main shaft, the cylindrical guide section of the pull rod is in transition fit or clearance fit with the cylindrical guide hole of the main shaft, the exposed section of the pull rod is penetrated in the impeller, and the exposed section of the pull rod is tightly clamped with the impeller through a coaxial locking nut or bolt.
In the scheme, the connecting end of the main shaft and the impeller are matched and centered through conical surfaces, a coaxial outer conical surface is arranged at the connecting end of the main shaft, and an inner conical surface is coaxially arranged on the impeller. The scheme increases a pair of guide structures such as the cylindrical guide hole and the cylindrical guide section, the deviation angle of the axis of the pull rod is limited by the cylindrical guide hole, and the problem that the axis of the pull rod and the axis of the main shaft are easily deviated greatly can be avoided to a great extent, so that the dynamic balance precision of the rotor core is improved, and the dynamic balance precision of the whole rotor is further ensured.
As a further improved structural form, the connecting end of the main shaft is provided with a coaxial regular polygon column section, the impeller is provided with a regular polygon column hole, and when the impeller is connected with the main shaft, the regular polygon column section is matched and inserted into the regular polygon column hole. The regular polygon column section and the regular polygon column hole are matched to circumferentially position the impeller and the main shaft, meanwhile, a good transmission function is achieved, and the installation is convenient.
As a further improved structural form, the cylindrical guide section of the pull rod and the cylindrical guide hole of the main shaft are in H/k type transition fit. The centering precision of the pull rod and the main shaft is directly affected by the selection of the matching types of the cylindrical guide section and the cylindrical guide hole, and experiments and practices prove that the centering precision of the pull rod and the main shaft can be ensured by adopting H/k type transition matching of the cylindrical guide section and the cylindrical guide hole, so that the dynamic balance precision of a rotor core is ensured.
As a further improved structural form, chamfer angles are respectively arranged at the port of the cylindrical guide hole of the main shaft and at the edges of the two ends of the cylindrical guide section of the pull rod. During assembly, grease is usually required to be smeared, grease can enter between the matching surfaces more easily through the chamfer, lubrication is more sufficient, and the phenomenon that contact stress is too concentrated due to sharp corners can be avoided through the chamfer.
The invention introduces a first assembly method of a rotor core of an expander, which comprises the following steps of:
s1, coating grease on an external thread section and a cylindrical guide section of a pull rod, guiding Kong Tuma grease on a cylinder of a main shaft, enabling the external thread section of the pull rod to pass through the cylindrical guide hole of the main shaft and screwed into an internal threaded hole of the main shaft, inserting the cylindrical guide section of the pull rod into the cylindrical guide hole of the main shaft, pre-tightening the pull rod and the main shaft by adopting a torque wrench, and marking the phase positions of the pull rod and the main shaft after pre-tightening;
s2, respectively smearing lubricating grease on conical surfaces of the main shaft and the impeller, sleeving the impeller on the main shaft, centering by utilizing the conical surfaces, circumferentially positioning by utilizing the cooperation of the regular polygon column section and the regular polygon column hole, and then marking the phase positions of the main shaft and the impeller;
s3, respectively smearing lubricating grease at the screw thread positions of the pull rod and the nut or the bolt, respectively smearing lubricating grease at the mutual contact surfaces of the impeller and the nut or the bolt, then pre-tightening the nut or the bolt by adopting a torque wrench, clamping the impeller, and marking the phase positions of the pull rod and the nut or the bolt after pre-tightening.
The assembly of many expander rotors belongs to high accuracy assembly, so usually need to carry out dynamic balance accuracy detection to whole rotor after whole rotor is all assembled, if the dynamic balance accuracy that detects this moment does not reach the requirement, need to disassemble whole rotor entirely, then assemble after changing corresponding part again. But this would certainly take more process time. For the rotor adopting the pull rod to connect the impeller, the dynamic balance precision of the rotor core of the expander consisting of the main shaft, the pull rod, the impeller, the nut or the bolt and the like meets the requirement, and the dynamic balance precision of the whole rotor generally meets the requirement. Therefore, the scheme develops a first assembly method, namely only the rotor core is assembled, and then the rotor core can be firstly subjected to the dynamic balance precision detection according to the requirement, so that the basis is provided for the subsequent assembly and other operations. The first assembling method developed by the scheme is characterized in that the assembling sequence of each part is regulated according to the structural characteristics, and lubricating grease is smeared on a plurality of assembling contact surfaces, so that the assembling method is more standardized, refined and normalized. And the phase positions are marked between the mutually matched parts, so that the repeatability of assembly can be determined according to the marked phase positions in the subsequent repeated assembly, the repeatability of the assembly precision can be greatly improved, and the dynamic balance precision of the rotor core and the whole rotor can be maintained after repeated assembly.
As further optimization, the pretension is performed in a plurality of times, and the torque increase amplitude during each tightening is 5% -10% of the maximum pretension torque. The maximum pre-tightening torque force can be obtained by looking up a table according to parameters such as the size of the screw thread. The tightening speed of the thread fit has influence on coaxial precision, pretightening force and wear of the fit contact surface, and the pretightening process is discretized and standardized by the scheme, so that coaxial precision and effective pretightening can be ensured to the greatest extent, and the wear of the fit contact surface is reduced.
As a further optimization, the phase of the torque wrench force is recorded each time it is tightened. The assembly process is further standardized, a basis is provided for subsequent repeated assembly, and the repeated assembly is carried out according to the recorded force phase through practical inspection, so that the repeatability of the dynamic balance precision of the rotor core can be greatly improved.
As a further optimization, before S1, the bench clamp is used to fix the position of the spindle, and the initial phase of the spindle is marked. The assembly process is further standardized, a basis is provided for subsequent repeated assembly, and the repeated assembly is carried out according to the initial phase of the main shaft mark through practical inspection, so that the repeatability of the dynamic balance precision of the rotor core can be greatly improved.
The invention also discloses a method for detecting the repeated assembly of the rotor core of the expander, which comprises the first assembly method of the rotor core of the expander, wherein the repeated assembly detection method further comprises the following steps after S3:
s4, detecting dynamic balance accuracy of a rotor core, wherein the dynamic balance accuracy comprises a numerical value and a phase; if the dynamic balance precision exceeds the precision requirement, replacing the pull rod and reassembling according to S1 to S3; if the dynamic balance precision meets the precision requirement, recording the dynamic balance precision including a numerical value and a phase, and then carrying out the next step;
s5, reversely and sequentially disassembling the parts according to the installation sequence in the steps S1 to S3, and then cleaning the disassembled parts;
s6, coating grease on the external thread section and the cylindrical guide section of the pull rod, guiding Kong Tuma grease on the cylinder of the main shaft, enabling the external thread section of the pull rod to pass through the cylindrical guide hole of the main shaft and screwed into the internal threaded hole of the main shaft, inserting the cylindrical guide section of the pull rod into the cylindrical guide hole of the main shaft, pre-tightening the pull rod and the main shaft by adopting a torque wrench, and ensuring the repeatability of phase position marks of the pull rod and the main shaft;
s7, respectively smearing lubricating grease on conical surfaces of the main shaft and the impeller, sleeving the impeller on the main shaft, centering by utilizing the conical surfaces, circumferentially positioning by utilizing the cooperation of the regular polygon column section and the regular polygon column hole, and ensuring the repeatability of the phase position marks of the main shaft and the impeller;
s8, respectively smearing lubricating grease at the screw thread positions of the pull rod and the nut or the bolt, respectively smearing lubricating grease at the mutual contact surfaces of the impeller and the nut or the bolt, and then pre-tightening the nut or the bolt by adopting a torque wrench and clamping the impeller, thereby ensuring the repeatability of the phase position marks of the pull rod and the nut or the bolt;
s9, detecting the dynamic balance precision of the rotor core again, and if the dynamic balance precision exceeds the precision requirement, replacing the pull rod and repeating the operations from S1 to S8; if the dynamic balance accuracy meets the accuracy requirement, recording the dynamic balance accuracy, including the numerical value and the phase, and ending the operation at the stage.
As described above, if the dynamic balance accuracy detection is not required after the whole rotor is assembled, it takes a long time to process. Therefore, the dynamic balance precision detection is directly carried out after the rotor core is assembled for the first time, the subsequent repeated assembly can be carried out only if the dynamic balance precision of the rotor core meets the requirement, and the repeated assembly detection method is more standardized, refined and normalized, so that the maintenance of the dynamic balance precision after repeated assembly can be greatly ensured, and the stable operation of the expander is further ensured. Through practical inspection, according to the method of the scheme, after the rotor core assembled for the first time is directly subjected to dynamic balance accuracy detection, the dynamic balance accuracy of the rotor core assembled again and again usually meets the requirements, and further the dynamic balance accuracy of the whole rotor is ensured, so that the process time can be greatly reduced.
Compared with the prior art, the invention has the following main beneficial effects: the pair of guide structures such as the cylindrical guide hole and the cylindrical guide section is added, so that the problem that the axle center of the pull rod and the axle center of the main shaft are easy to deviate greatly can be avoided to a great extent, and the dynamic balance precision of the rotor core is improved. The method provided by the invention has the advantages that the disassembly and assembly sequence of each part is regulated according to the structural characteristics, the lubricating grease is smeared on a plurality of assembly contact surfaces, and the method is more standardized, refined and normalized. And the phase positions are marked among the mutually matched parts, so that the repeatability of assembly can be determined according to the marked phase positions in the subsequent repeated assembly, the repeatability of the assembly precision can be greatly improved, the dynamic balance precision of the rotor core is maintained after repeated assembly, and the reliability and the repeatability of the whole rotor assembly and disassembly precision are further ensured. In addition, the pre-tightening process in the method is discretized and standardized, so that coaxial precision and effective pre-tightening can be ensured to the greatest extent, and abrasion of the matched contact surface is reduced. After the rotor core is assembled for the first time, dynamic balance precision detection is directly carried out, the subsequent repeated assembly can be carried out only if the dynamic balance precision of the rotor core meets the requirement, and the method is more standardized, refined and normalized, so that the maintenance of the dynamic balance precision after repeated assembly can be greatly ensured, the stable operation of the expander is further ensured, and meanwhile, the process time can be greatly reduced.
Drawings
Fig. 1 is a schematic cross-sectional view of a rotor core according to an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of an impeller according to an embodiment of the present invention.
Fig. 3 is a schematic cross-sectional structure of a spindle according to an embodiment of the present invention.
Fig. 4 is a schematic structural view of a pull rod according to an embodiment of the present invention.
Description of the embodiments
The invention is further described below with reference to the accompanying drawings. The drawings are for illustrative purposes only and are not to be construed as limiting the present patent. For the sake of brevity of description of the present embodiment, some parts of the drawings or description that are well known to those skilled in the art but not relevant to the main content of the present invention will be omitted. In addition, some parts in the drawings may be omitted, enlarged or reduced for convenience of description, but not represent the size or the whole structure of the actual product.
As shown in fig. 1, 2, 3 and 4, the rotor core of the expander comprises a main shaft 1, a pull rod 2 and an impeller 3. The connecting end of the main shaft 1 is provided with an outer conical surface 11, the impeller 3 is provided with an inner conical surface 31, and the connecting end of the main shaft 1 and the impeller 3 are matched and centered through the conical surface. The connecting end of the main shaft 1 is coaxially provided with a regular hexagon column section 12 with a regular hexagon cross section, the impeller 3 is coaxially provided with a regular hexagon column hole 32 with a regular hexagon cross section, and when the impeller 3 is connected with the main shaft 1, the regular hexagon column section 12 is matched and inserted into the regular hexagon column hole 32. Because of the conical surface fit centering, a looser clearance fit between the regular hexagonal post segments 12 and the regular hexagonal post holes 32 may be used.
An internal threaded hole 13 and a cylindrical guide hole 14 are coaxially arranged in the main shaft 1, and the cylindrical guide hole 14 is positioned between the internal threaded hole 13 and the end face of the connecting end of the main shaft 1 and is close to the end face. The stretching-in section of the pull rod 2 is coaxially provided with an external thread section 21 and a cylindrical guide section 22, the stretching-in section of the pull rod 2 stretches into the main shaft 1, the external thread section 21 of the pull rod 2 is in threaded fit with the internal thread hole 13 of the main shaft 1, and the cylindrical guide section 22 of the pull rod 2 is in transitional fit with the cylindrical guide hole 14 of the main shaft 1. The transition fit of the cylindrical guide section 22 and the cylindrical guide bore 14 in this embodiment employs an H/k type transition fit. In other embodiments the cylindrical guide section and the cylindrical guide bore may also be a clearance fit. The exposed section of the pull rod 2 passes through the impeller 3, and the exposed section of the pull rod 2 is matched with the coaxial lock nut 4 through threads, so that the impeller 3 is clamped. The main body of the nut 4 in the embodiment is round nut, the main body of the nut 4 coaxially extends out of a hexagonal wrench position, a countersink is coaxially arranged on the impeller 3, and the main body of the nut 4 is in clearance fit and extends into the countersink of the impeller 3, so that the pull rod 2 can be guided, the centering precision of the pull rod 2 and the impeller 3 is ensured, and the dynamic balance precision of a rotor core is further ensured. The hexagonal wrench is exposed to the impeller 3 to facilitate the locking operation of the nut 4.
In this embodiment, chamfers are respectively provided at the end ports of the cylindrical guide hole 14 of the spindle 1 and at the edges of both ends of the cylindrical guide section 22 of the pull rod 2. During assembly, grease is usually required to be smeared, grease can enter between the matching surfaces more easily through the chamfer, lubrication is more sufficient, and the phenomenon that contact stress is too concentrated due to sharp corners can be avoided through the chamfer.
The main shaft 1 and the impeller 3 in the embodiment adopt the regular hexagonal column section 12 and the regular hexagonal column hole 32 to be matched for circumferential positioning, so that the installation is convenient, and a good transmission effect can be achieved after the assembly. The most important is that this embodiment adds a pair of guide structures such as cylinder guiding hole 14 and cylinder guide section 22, and the deflection angle of pull rod 2 axle center is restricted by cylinder guiding hole 14, can avoid the axle center of pull rod 2 and the easy great problem that deviates of axle center of main shaft 1 to a great extent. Moreover, the cylindrical guide section 22 and the cylindrical guide hole 14 are in H/k type transition fit, and experiments and practices prove that the centering accuracy of the pull rod 2 and the main shaft 1 can be ensured, and further the dynamic balance accuracy of the rotor core is ensured.
With respect to the rotor core of the expander, this embodiment describes a first assembly method of the rotor core of the expander: firstly, horizontally fixing a main shaft 1 by using bench clamps, and marking the initial phase of the main shaft 1;
s1, uniformly coating grease on an external thread section 21 and a cylindrical guide section 22 of a pull rod 2, uniformly coating grease on a cylindrical guide hole 14 of a main shaft 1, enabling the external thread section 21 of the pull rod 2 to pass through the cylindrical guide hole 14 of the main shaft 1 and be screwed into an internal threaded hole 13 of the main shaft 1, simultaneously enabling the cylindrical guide section 22 of the pull rod 2 to be inserted into the cylindrical guide hole 14 of the main shaft 1, then pre-tightening the pull rod 2 and the main shaft 1 by adopting a torque wrench, and marking the phase positions of the pull rod 2 and the main shaft 1 after pre-tightening;
s2, uniformly smearing lubricating grease on conical surfaces of the main shaft 1 and the impeller 3, sleeving the impeller 3 on the main shaft 1, centering by utilizing the conical surfaces in a matched manner, circumferentially positioning by utilizing the regular hexagonal column section 12 and the regular hexagonal column hole 32 in a matched manner, and marking the phase positions of the main shaft 1 and the impeller 3;
s3, respectively and uniformly smearing lubricating grease at the screw thread positions of the pull rod 2 and the nut 4, respectively and uniformly smearing lubricating grease at the mutual contact surfaces of the impeller 3 and the nut 4, then pre-tightening the nut 4 by adopting a torque wrench and clamping the impeller 3, and marking the phase positions of the pull rod 2 and the nut 4 after pre-tightening.
The pretension in the method is divided into multiple times of tightening, and the torque increase amplitude during each tightening is 5% -10% of the maximum pretension torque. The maximum pre-tightening torque force can be obtained by looking up a table according to parameters such as the size of the screw thread. The tightening speed of the screw thread fit has influence on the coaxial precision, the pretightening force and the abrasion of the fit contact surface, and the pretightening process is discretized and standardized, so that the coaxial precision and the effective pretightening can be ensured to the greatest extent, and the abrasion of the fit contact surface is reduced.
In the method, the force phase of the torque wrench is recorded when the torque wrench is screwed down each time. The assembly process is further standardized, a basis is provided for subsequent repeated assembly, and the repeated assembly is carried out according to the recorded force phase through practical inspection, so that the repeatability of the dynamic balance precision of the rotor core can be greatly improved.
In addition, before the main shaft 1 and the rotor core are fixed, the first assembling method respectively detects dynamic balance precision of the main shaft 1, the pull rod 2, the impeller 3 and the nut 4, records dynamic balance precision of each part, and only the parts meeting the respective precision requirements can be used during assembling.
For the rotor adopting the pull rod 2 to connect the impeller 3, the dynamic balance precision of the rotor core of the expander consisting of the main shaft 1, the pull rod 2, the impeller 3, the nut 4 and the like meets the requirements, and the dynamic balance precision of the whole rotor generally meets the requirements. Therefore, the first assembly method is developed, namely only the rotor core is assembled, and then the rotor core can be firstly subjected to the dynamic balance precision detection according to the requirement, so that the basis is provided for the subsequent assembly and other operations. The first assembling method developed in the embodiment specifies the assembling sequence of each part according to the structural characteristics, and provides that the lubricating grease is uniformly smeared on a plurality of assembling contact surfaces, so that the assembling method is more standardized, refined and normalized. And the phase positions are marked between the mutually matched parts, so that the repeatability of assembly can be determined according to the marked phase positions in the subsequent repeated assembly, the repeatability of the assembly precision can be greatly improved, and the dynamic balance precision of the rotor can be maintained after repeated assembly.
The embodiment also introduces a method for detecting repeated assembly of a rotor core of an expander, including the first method for assembling a rotor core of an expander, where the method for detecting repeated assembly further includes, after S3:
s4, detecting dynamic balance accuracy of a rotor core, wherein the dynamic balance accuracy comprises a numerical value and a phase; if the dynamic balance precision exceeds the precision requirement, replacing the pull rod 2 and reassembling according to S1 to S3; if the dynamic balance precision meets the precision requirement, recording the dynamic balance precision including a numerical value and a phase, and then carrying out the next step;
s5, reversely and sequentially disassembling the parts according to the installation sequence in the steps S1 to S3, and then cleaning the disassembled parts;
s6, uniformly coating grease on the external thread section 21 and the cylindrical guide section 22 of the pull rod 2, uniformly coating grease on the cylindrical guide hole 14 of the main shaft 1, enabling the external thread section 21 of the pull rod 2 to pass through the cylindrical guide hole 14 of the main shaft 1 and screwed into the internal threaded hole 13 of the main shaft 1, simultaneously enabling the cylindrical guide section 22 of the pull rod 2 to be inserted into the cylindrical guide hole 14 of the main shaft 1, then pre-tightening the pull rod 2 and the main shaft 1 by adopting a torque wrench, and ensuring the repeatability of phase position marks of the pull rod 2 and the main shaft 1;
s7, uniformly smearing lubricating grease on conical surfaces of the main shaft 1 and the impeller 3, sleeving the impeller 3 on the main shaft 1, centering by utilizing the conical surfaces in a matched manner, circumferentially positioning by utilizing the regular hexagonal column section 12 and the regular hexagonal column hole 32 in a matched manner, and ensuring the repeatability of phase position marks of the main shaft 1 and the impeller 3;
s8, respectively and uniformly smearing lubricating grease at the mutually matched screw thread positions of the pull rod 2 and the nut 4, respectively and uniformly smearing lubricating grease at the mutually contacted surfaces of the impeller 3 and the nut 4, and then pre-tightening the nut 4 and clamping the impeller 3 by adopting a torque wrench, thereby ensuring the repeatability of the phase position marks of the pull rod 2 and the nut 4;
s9, detecting the dynamic balance precision of the rotor core again, and if the dynamic balance precision exceeds the precision requirement, replacing the pull rod 2 and repeating the operations from S1 to S8; if the dynamic balance accuracy meets the accuracy requirement, recording the dynamic balance accuracy, including the numerical value and the phase, and ending the operation at the stage.
Although the parts which are detected and meet the precision requirement can be assembled, the phenomena of error accumulation, superposition and the like can exist after the assembly, so that the situation that the assembled parts cannot meet the precision requirement can be possibly caused, and the probability of occurrence of the situation is small, but the situation needs to be considered. For the rotor core and the rotor adopting the pull rod 2 to connect the impeller 3, the dynamic balance precision exceeds the precision requirement usually due to the phenomena of accumulation and superposition of errors of the pull rod 2 and the main shaft 1. Because the replacement of the tie rod 2 is labor-saving and relatively low in cost due to factors such as weight and cost, only the tie rod 2 is replaced when the dynamic balance accuracy detected in the repeated assembly detection method in the embodiment exceeds the accuracy requirement.
According to the method, dynamic balance accuracy detection is directly carried out after the rotor core is assembled for the first time, subsequent repeated assembly can be carried out only if the dynamic balance accuracy of the rotor core meets the requirement, and the repeated assembly detection method is more standardized, refined and normalized, so that maintenance of the dynamic balance accuracy after repeated assembly can be greatly ensured, and stable operation of the expander is further ensured. After practical inspection, the rotor core assembled according to the first assembly method directly performs dynamic balance accuracy detection to meet the requirements, and according to the method of the embodiment, the dynamic balance accuracy of the rotor core after repeated assembly also generally meets the requirements. That is, as long as the rotor core is assembled according to the method of the present embodiment in the subsequent repeated assembly process, the accuracy of the entire rotor is ensured, and thus the process time can be greatly reduced.
The foregoing is only one embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept of the present invention fall within the scope of the present invention.

Claims (9)

1. The rotor core of the expander is characterized by comprising a main shaft, a pull rod and an impeller, wherein the connecting end of the main shaft and the impeller are centered through conical surface matching, an internal threaded hole and a cylindrical guide hole are coaxially arranged in the main shaft, the cylindrical guide hole is positioned between the internal threaded hole and the end face of the connecting end of the main shaft, an external threaded section and a cylindrical guide section are coaxially arranged on an extending section of the pull rod, the extending section of the pull rod extends into the main shaft, the external threaded section of the pull rod is in threaded fit with the internal threaded hole of the main shaft, the cylindrical guide section of the pull rod is in transition fit or clearance fit with the cylindrical guide hole of the main shaft, the exposed section of the pull rod is arranged on the impeller in a penetrating mode, and the impeller is clamped by the exposed section of the pull rod through a coaxial locking nut or bolt.
2. The expander rotor core according to claim 1, wherein the connecting end of the main shaft is provided with a coaxial regular polygonal column section, the impeller is provided with a regular polygonal column hole, and the regular polygonal column section is inserted into the regular polygonal column hole in a matching manner when the impeller is connected with the main shaft.
3. The expander rotor core of claim 1 wherein the cylindrical guide section of the tie rod and the cylindrical guide bore of the main shaft are in a H/k type transition fit.
4. The expander rotor core according to claim 1, wherein chamfers are respectively provided at the ports of the cylindrical guide holes of the main shaft and at both end edges of the cylindrical guide sections of the tie rod.
5. A method of first assembling a rotor core of an expander, comprising the rotor core of an expander of claim 2, the first assembling method comprising:
s1, coating grease on an external thread section and a cylindrical guide section of a pull rod, guiding Kong Tuma grease on a cylinder of a main shaft, enabling the external thread section of the pull rod to pass through the cylindrical guide hole of the main shaft and screwed into an internal threaded hole of the main shaft, inserting the cylindrical guide section of the pull rod into the cylindrical guide hole of the main shaft, pre-tightening the pull rod and the main shaft by adopting a torque wrench, and marking the phase positions of the pull rod and the main shaft after pre-tightening;
s2, respectively smearing lubricating grease on conical surfaces of the main shaft and the impeller, sleeving the impeller on the main shaft, centering by utilizing the conical surfaces, circumferentially positioning by utilizing the cooperation of the regular polygon column section and the regular polygon column hole, and then marking the phase positions of the main shaft and the impeller;
s3, respectively smearing lubricating grease at the screw thread positions of the pull rod and the nut or the bolt, respectively smearing lubricating grease at the mutual contact surfaces of the impeller and the nut or the bolt, then pre-tightening the nut or the bolt by adopting a torque wrench, clamping the impeller, and marking the phase positions of the pull rod and the nut or the bolt after pre-tightening.
6. The method of assembling a rotor core for an expander according to claim 5, wherein the pre-tightening is performed in multiple tightening steps, and the torque increases by 5% -10% of the maximum pre-tightening torque during each tightening step.
7. The method of assembling a rotor core for an expander of claim 6, wherein the torque wrench force phase is recorded for each tightening.
8. The method of assembling a rotor core for an expander according to claim 5, wherein prior to said step S1, the spindle is fixed in position by using a pair of pliers, and an initial phase of the spindle is marked.
9. A method for detecting the repeated assembly of a rotor core of an expander, comprising the first assembly method of a rotor core of an expander according to claim 5, wherein the repeated assembly detection method further comprises, after S3:
s4, detecting dynamic balance accuracy of a rotor core, wherein the dynamic balance accuracy comprises a numerical value and a phase; if the dynamic balance precision exceeds the precision requirement, replacing the pull rod and reassembling according to S1 to S3; if the dynamic balance precision meets the precision requirement, recording the dynamic balance precision including a numerical value and a phase, and then carrying out the next step;
s5, reversely and sequentially disassembling the parts according to the installation sequence in the steps S1 to S3, and then cleaning the disassembled parts;
s6, coating grease on the external thread section and the cylindrical guide section of the pull rod, guiding Kong Tuma grease on the cylinder of the main shaft, enabling the external thread section of the pull rod to pass through the cylindrical guide hole of the main shaft and screwed into the internal threaded hole of the main shaft, inserting the cylindrical guide section of the pull rod into the cylindrical guide hole of the main shaft, pre-tightening the pull rod and the main shaft by adopting a torque wrench, and ensuring the repeatability of phase position marks of the pull rod and the main shaft;
s7, respectively smearing lubricating grease on conical surfaces of the main shaft and the impeller, sleeving the impeller on the main shaft, centering by utilizing the conical surfaces, circumferentially positioning by utilizing the cooperation of the regular polygon column section and the regular polygon column hole, and ensuring the repeatability of the phase position marks of the main shaft and the impeller;
s8, respectively smearing lubricating grease at the screw thread positions of the pull rod and the nut or the bolt, respectively smearing lubricating grease at the mutual contact surfaces of the impeller and the nut or the bolt, and then pre-tightening the nut or the bolt by adopting a torque wrench and clamping the impeller, thereby ensuring the repeatability of the phase position marks of the pull rod and the nut or the bolt;
s9, detecting the dynamic balance precision of the rotor core again, and if the dynamic balance precision exceeds the precision requirement, replacing the pull rod and repeating the operations from S1 to S8; if the dynamic balance accuracy meets the accuracy requirement, recording the dynamic balance accuracy, including the numerical value and the phase, and ending the operation at the stage.
CN202311339035.3A 2023-10-17 2023-10-17 Rotor core of expander, first assembling method and repeated assembling detection method Pending CN117489414A (en)

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CN202311339035.3A CN117489414A (en) 2023-10-17 2023-10-17 Rotor core of expander, first assembling method and repeated assembling detection method

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CN202311339035.3A CN117489414A (en) 2023-10-17 2023-10-17 Rotor core of expander, first assembling method and repeated assembling detection method

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