CN110469547B - Method for mounting impeller and rotor shaft - Google Patents
Method for mounting impeller and rotor shaft Download PDFInfo
- Publication number
- CN110469547B CN110469547B CN201910650214.6A CN201910650214A CN110469547B CN 110469547 B CN110469547 B CN 110469547B CN 201910650214 A CN201910650214 A CN 201910650214A CN 110469547 B CN110469547 B CN 110469547B
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- China
- Prior art keywords
- impeller
- rotor shaft
- positioning column
- nut
- rotor
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/266—Rotors specially for elastic fluids mounting compressor rotors on shafts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/284—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors
Abstract
The invention relates to a method for mounting an impeller and a rotor shaft, wherein the impeller is tightly pressed on a step surface of the rotor shaft through a positioning column, a shaft-holding tool, a first nut and a second nut; the positioning column is of a double-end stud structure, the thread directions of two sides are the same, preferably both are left-handed, one end of the positioning column is provided with an axial inner hexagonal or inner square blind hole, and the outer diameter of the positioning column is smaller than the inner diameter of the central hole of the impeller; under the action of a certain pre-tightening force, the structure opposite to the rotation direction of the compressor can ensure that the rotor assembly is a fastened and firm whole all the time in the rotation process of the compressor, thereby facilitating the loading of tightening torque. The rotor fastening structural member disclosed by the invention can be widely applied to centrifugal refrigeration compressors adopting the same structure, has the advantages of simple structure, lower cost, convenience in installation, better practicability, easiness in popularization and application and higher practical value.
Description
Technical Field
The invention belongs to the field of installation of a rotor impeller of a compressor, and particularly relates to an installation method of an impeller and a rotor shaft.
Background
The rotor fastening structure is an important structure in the centrifugal refrigeration compressor, and a certain pretightening force can be applied through the rotor fastening structure to fix a plurality of rotor parts (such as an impeller, a regulating pad, a shaft sleeve and the like) on a rotor shaft of the compressor so as to ensure that a rotor assembly of the centrifugal refrigeration compressor comprising the rotor shaft, the impeller, the regulating pad, the shaft sleeve and the like is a fixedly connected whole, thereby ensuring that the compressor cannot have the faults of rotor slipping, loosening and the like in the whole operation process.
As shown in fig. 1, the rotor fastening structure of the conventional centrifugal refrigerant compressor is generally a fastening screw structure, and the rotor assembly is integrally fastened by the fastening screw. However, for some centrifugal refrigeration compressors, as shown in fig. 2, because a complete motor product (i.e. including a motor stator, a motor rotor, a bearing, a motor housing, etc., integrated into a whole, similar to an electric spindle structure) is adopted, the motor has been packaged into a whole, and only one end shaft extends out for assembling rotor components such as an impeller of the centrifugal refrigeration compressor. At this moment, if adopt the fastening screw structure, rotor shaft one end encapsulation is inside the motor product, and the motor shaft can't be fixed, can appear following the commentaries on classics and lead to centrifugal refrigeration compressor rotor subassembly to twist not tight when assembling fastening screw, more can't load the pretightning force to the rotor subassembly appears slipping and not hard up when rotating and waits trouble.
The invention aims to provide a centrifugal refrigeration compressor which adopts a complete motor with only one end shaft extending out, and designs a rotor fastening structure, thereby realizing the fixed connection of a rotor component of the centrifugal refrigeration compressor.
Disclosure of Invention
The technical problems solved by the invention are as follows: the utility model provides a fastening structure of rotor shaft and impeller has solved the unable problem that links firmly the rotor subassembly of fastening screw structure commonly used
The technical scheme of the invention is as follows: the method comprises the steps of providing an impeller and a rotor shaft, wherein the impeller is tightly pressed on a step surface of the rotor shaft through a positioning column, a shaft holding tool, a first nut and a second nut;
the positioning column 1 is of a double-end stud structure, threads on two sides have the same rotating direction, preferably both threads are left-handed, one end of the positioning column 1 is provided with an axial inner hexagonal or inner square blind hole, and the outer diameter of the positioning column is smaller than the inner diameter of a central hole of the impeller; under the action of a certain pre-tightening force, the structure opposite to the rotation direction of the compressor can ensure that the rotor assembly is a fastened and firm whole all the time in the rotation process of the compressor, thereby facilitating the loading of tightening torque.
The rotor shaft is an impeller shaft of the compressor, and the front end of the rotor shaft is provided with an axial threaded hole which is matched with the external thread at the other end of the positioning column;
the shaft holding tool 14 can hold or clamp and fix the rotor shaft;
the first nut and the second nut are in threaded fit with one end of the positioning column, double nuts are self-locked, and the anti-loosening function is further achieved;
the method comprises the following steps:
step 1), the rotor shaft 9 is tightly held and fixed through a shaft holding tool 14, the other end of the positioning column is fastened with the rotor shaft through threads, and the shaft holding tool is detached;
step 2), sleeving the impeller on the rotor shaft, inserting a wrench into the inner hexagonal or inner square blind hole after the impeller is installed in place and the end part of the rotor shaft does not exceed the central hole of the impeller, and fixing the wrench to prevent the rotor shaft from rotating;
and 3) screwing a first nut and a second nut at one end of the positioning column, pressing the impeller tightly, and removing the wrench to finish the installation of the impeller.
Further, a spacer is interposed between the impeller and the step surface of the rotor shaft.
Further, the impeller comprises a primary impeller, a shaft sleeve and a secondary impeller.
Furthermore, the thread turning directions of the two sides of the positioning column 1 are opposite to the rotating direction of the impeller.
Further, the thickness of the first nut is larger than that of the second nut.
Has the advantages that: the invention effectively solves the problem of fastening the rotor component of the centrifugal refrigeration compressor which adopts the complete motor with only one end shaft extending out.
The rotor fastening structure can be widely applied to centrifugal refrigeration compressors with the same structure, and can also be used for fastening rotor components of centrifugal refrigeration compressors with other structure types. The rotor fastening structural member has the advantages of simple structure, low cost, convenience in installation, good practicability, easiness in popularization and application and higher practical value.
Drawings
FIG. 1 is a block diagram of a centrifugal refrigerant compressor rotor assembly;
FIG. 2 is a structural assembly view of a complete motor and rotor assembly of the centrifugal refrigeration compressor;
FIG. 3 is a schematic view of a centrifugal refrigerant compressor rotor fastening structure, assembly tooling and installation;
FIG. 4 is a schematic structural view of a shaft-embracing fixture;
FIG. 5 is a block diagram of a conventional centrifugal refrigerant compressor rotor assembly;
wherein: the device comprises a positioning column 1, a second nut 2, a first nut 3, a first-stage impeller 4, a first-stage adjusting pad 5, a shaft sleeve 6, a second-stage impeller 7, a second-stage adjusting pad 8, a rotor shaft 9, a bearing 10, a motor stator 11, a motor rotor 12, a motor shell 13, a shaft-holding tool 14 and a fastening screw 15.
Detailed Description
As shown in fig. 1 to 4, a method for mounting an impeller and a rotor shaft is provided, wherein the impeller is pressed on a step surface of the rotor shaft through a positioning column, a shaft holding tool 14, a first nut and a second nut;
the positioning column 1 is of a double-end stud structure, threads on two sides have the same rotating direction, preferably both threads are left-handed, one end of the positioning column 1 is provided with an axial inner hexagonal or inner square blind hole, and the outer diameter of the positioning column is smaller than the inner diameter of a central hole of the impeller; under the action of a certain pre-tightening force, the structure opposite to the rotation direction of the compressor can ensure that the rotor assembly is a fastened and firm whole all the time in the rotation process of the compressor, thereby facilitating the loading of tightening torque.
The rotor shaft is an impeller shaft of the compressor, and the front end of the rotor shaft is provided with an axial threaded hole which is matched with the external thread at the other end of the positioning column;
the shaft holding tool 14 can hold or clamp and fix the rotor shaft;
the first nut and the second nut are in threaded fit with one end of the positioning column, double nuts are self-locked, and the anti-loosening function is further achieved;
the method comprises the following steps:
step 1), the rotor shaft 9 is tightly held and fixed through a shaft holding tool 14, the other end of the positioning column is fastened with the rotor shaft through threads, and the shaft holding tool is detached;
step 2), sequentially sleeving the primary impeller, the shaft sleeve, the secondary impeller and the gasket on the rotor shaft, inserting a wrench into the inner hexagonal or inner square blind hole after the impeller is installed in place and enabling the rotor shaft not to rotate;
and 3) screwing a first nut and a second nut at one end of the positioning column, pressing the impeller tightly, and removing the wrench to finish the installation of the impeller.
And the rotating directions of the threads on the two sides of the positioning column 1 are opposite to the rotating direction of the impeller.
Claims (7)
1. The method for mounting the impeller and the rotor shaft comprises the following steps that the impeller is tightly pressed on a step surface of the rotor shaft through a positioning column, a shaft holding tool, a first nut and a second nut;
the positioning column is of a double-end stud structure, threads on two sides have the same rotating direction, one end of the positioning column is provided with an axial inner hexagonal or inner square blind hole, and the outer diameter of the positioning column is smaller than the inner diameter of a central hole of the impeller; under the action of a certain pre-tightening force, the structure opposite to the rotation direction of the compressor can ensure that the rotor assembly is a fastened and firm whole all the time in the rotation process of the compressor, thereby facilitating the loading of tightening torque;
the rotor shaft is an impeller shaft of the compressor, and the front end of the rotor shaft is provided with an axial threaded hole which is matched with the external thread at the other end of the positioning column;
the shaft holding tool can hold or clamp and fix the rotor shaft;
the first nut and the second nut are in threaded fit with one end of the positioning column, double nuts are self-locked, and the anti-loosening function is further achieved;
the method comprises the following steps:
step 1), the rotor shaft is tightly held and fixed through a shaft holding tool, the other end of the positioning column is fastened with the rotor shaft through threads, and the shaft holding tool is detached;
step 2), sleeving the impeller on the rotor shaft, inserting a wrench into the inner hexagonal or inner square blind hole after the impeller is installed in place and the end part of the rotor shaft does not exceed the central hole of the impeller, and fixing the wrench to prevent the rotor shaft from rotating;
and 3) screwing a first nut and a second nut at one end of the positioning column, pressing the impeller tightly, and removing the wrench to finish the installation of the impeller.
2. A method of mounting an impeller and a rotor shaft according to claim 1, wherein: a spacer is interposed between the impeller and the step surface of the rotor shaft.
3. A method of mounting an impeller and a rotor shaft according to claim 1, wherein: the impeller comprises a first-stage impeller, a shaft sleeve and a second-stage impeller.
4. A method of mounting an impeller and a rotor shaft according to claim 1, wherein: the first nut is thicker than the second nut.
5. A method of mounting an impeller and a rotor shaft according to claim 1, wherein: the positioning column is of a double-end stud structure, and the screw threads on two sides have the same rotating direction and are all left-handed.
6. A method of mounting an impeller and a rotor shaft according to claim 2, wherein: the first nut is thicker than the second nut.
7. A method of mounting an impeller and a rotor shaft according to claim 3, wherein: the positioning column is of a double-end stud structure, and the screw threads on two sides have the same rotating direction and are all left-handed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910650214.6A CN110469547B (en) | 2019-07-18 | 2019-07-18 | Method for mounting impeller and rotor shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910650214.6A CN110469547B (en) | 2019-07-18 | 2019-07-18 | Method for mounting impeller and rotor shaft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110469547A CN110469547A (en) | 2019-11-19 |
| CN110469547B true CN110469547B (en) | 2021-03-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910650214.6A Active CN110469547B (en) | 2019-07-18 | 2019-07-18 | Method for mounting impeller and rotor shaft |
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| Country | Link |
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| CN (1) | CN110469547B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11560900B2 (en) | 2020-06-09 | 2023-01-24 | Emerson Climate Technologies, Inc. | Compressor driveshaft assembly and compressor including same |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6709234B2 (en) * | 2001-08-31 | 2004-03-23 | Pyrotek, Inc. | Impeller shaft assembly system |
| DE102010010136A1 (en) * | 2010-03-04 | 2011-09-08 | Continental Automotive Gmbh | Shaft having at least one impeller and method of attaching an impeller to a shaft of a turbocharger |
| CN106364496B (en) * | 2016-09-30 | 2019-02-26 | 中车南京浦镇车辆有限公司 | One kind seizing installation motor spring suspension device |
| CN207363962U (en) * | 2017-10-20 | 2018-05-15 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of direct-connected draught fan impeller dismountable fixture of middle and small motor |
| CN209053803U (en) * | 2018-09-11 | 2019-07-02 | 上海水泵制造有限公司 | A kind of short axle attachment device for vane rotor experiment of dynamic balancing |
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- 2019-07-18 CN CN201910650214.6A patent/CN110469547B/en active Active
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| CN110469547A (en) | 2019-11-19 |
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