CN115962249A - Multi-section hollow shafting middle crossing assistor - Google Patents
Multi-section hollow shafting middle crossing assistor Download PDFInfo
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- CN115962249A CN115962249A CN202211603846.5A CN202211603846A CN115962249A CN 115962249 A CN115962249 A CN 115962249A CN 202211603846 A CN202211603846 A CN 202211603846A CN 115962249 A CN115962249 A CN 115962249A
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- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 239000002861 polymer material Substances 0.000 claims description 3
- 230000009194 climbing Effects 0.000 abstract 4
- 238000000034 method Methods 0.000 description 6
- 230000000670 limiting effect Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The invention discloses a multi-section hollow shafting middle part climbing assistor, which comprises a hollow shafting main body, wherein the hollow shafting main body comprises a shell and a multi-section hollow shafting arranged on the inner wall of the shell, the climbing assistor is arranged on the inner wall of the shell, the axis of the climbing assistor is superposed with the axis of the hollow shafting, and the radial axis of the climbing assistor is superposed with the central line between the adjacent hollow shafting. The invention can effectively control the over-critical amplitude of the multi-section hollow shaft system, enables the multi-section hollow shaft system to safely and smoothly pass through the critical rotating speed and further rise to the working rotating speed, and is an important guarantee for improving the working efficiency of the rotating machine and ensuring the safety of the multi-section hollow shaft system.
Description
Technical Field
The invention belongs to the technical field of rotating bearings, and particularly relates to a middle crossing assistor of a multi-section hollow shaft system.
Background
In many large rotating machines, a multi-span bearing structure is used, and a multi-section bearing is generally used for driving or supporting a multi-section hollow shafting. In order to reduce the bearing load, hollow bearings are widely used in rotary machines. The multi-section hollow shaft system passes through the critical rotating speed of the bearing system and the bending critical rotating speed of the bearing in the process of increasing the speed to the working rotating speed, so that the multi-section hollow shaft system works under the supercritical rotating speed and is embodied as a flexible bearing.
When the bearing is accelerated to approach the critical rotation speed, the amplitude of the vibration increases rapidly, and if the vibration is not controlled, the bearing may be seriously damaged by collision with the housing or other stationary parts of the rotating machine in the critical rotation speed region. For this purpose, a method is proposed for safely passing a multi-section hollow shaft through a critical speed by mounting a booster on a stationary part.
The auxiliary crossing device is used as an additional substructure, and the main function of the auxiliary crossing device is to utilize the anti-resonance characteristic of a multi-degree-of-freedom structure and control the intensity of vibration response of the multi-section hollow shaft system when the multi-section hollow shaft system passes through the critical state by means of rotation inertia and buffering action, so that the bearing system can safely and smoothly pass through the critical rotating speed.
The critical rotating speed is an important rotating speed area in the process that the rotating machinery is increased to the working rotating speed, particularly the bending mode critical rotating speed of the multi-section hollow shaft system, and the amplitude of the bearing system can be rapidly and greatly increased in a short time. At present, the transcritical technology widely applied in the field of rotating machinery is mainly a dynamic balance technology. When dynamic balance is carried out on the flexible multi-section hollow shaft system, the support end of the multi-section hollow shaft system and the position with the maximum deflection during transcritical process are required to be used as correction surfaces, and dynamic balance of the system is achieved by adding (removing) weight.
Through the above analysis, the problems and defects of the prior art are as follows: the multi-section hollow shaft system is formed by connecting at least two sections of hollow bearings, and the dynamic balance of the multi-section hollow shaft system is subjected to speed raising and reducing tests for at least 4 times, so that the working procedure is complex. And after the multi-section hollow shaft system passes through the critical rotating speed, the correcting mass is taken as a part of the bearing system and is accelerated to the working rotating speed along with the part, and the correcting mass becomes a new unbalanced mass.
The significance of solving the technical problems is that:
the invention provides a middle crossing assistor of a multi-section hollow shaft system made of high polymer, which is positioned outside the multi-section hollow shaft system, takes the maximum deflection position when a bearing system passes through critical as an auxiliary position, solves the problem that the multi-section hollow shaft system is difficult to pass through the critical rotating speed due to overlarge amplitude, simultaneously omits a dynamic balance process, can effectively control the passing through critical amplitude of the multi-section hollow shaft system, enables the multi-section hollow shaft system to safely and smoothly pass through the critical rotating speed and further rise to the working rotating speed, and is an important guarantee for improving the working efficiency of a rotating machine and ensuring the safety of the multi-section hollow shaft system.
Disclosure of Invention
According to the problems, the invention provides a middle crossing assistor for a multi-section hollow shaft system
The technical scheme of the invention is as follows:
the middle passing assistor for the multi-section hollow shafting comprises a hollow shafting main body, wherein the hollow shafting main body comprises a shell and the multi-section hollow shafting arranged on the inner wall of the shell, the assistor is arranged on the inner wall of the shell, the axis of the assistor is coincided with the axis of the hollow shafting, and the radial axis of the assistor is coincided with the central line between the adjacent hollow shafting.
Preferably, the passing aid comprises a base fixedly connected to the inner wall of the shell and a circular ring nested in the base, the axis of the base is overlapped with the axis of the hollow shafting, and the radial axis of the base is overlapped with the central line between the adjacent hollow shafting.
Further preferably, an initial gap exists between the inner wall of the circular ring and the outer wall of the hollow shaft system.
More preferably, the initial gap is 1 to 2mm.
Preferably, the inner wall of the circular ring is provided with a plurality of groups of contact salient points at equal angles.
Further preferably, the contact bumps are provided with 6 sets.
Further preferably, two sides of the contact bump are recessed downwards to form a small groove.
Preferably, the outer wall of the circular ring is provided with a W-shaped large groove corresponding to the contact salient point at an equal angle.
Preferably, the ring is made of a polymer material.
Further preferably, the circular ring is made of polytetrafluoroethylene.
The beneficial effects of the invention are as follows:
under the critical rotating speed, when the amplitude of the multi-section hollow shaft system is larger than the initial gap between the multi-section hollow shaft system and the passing aid, the multi-section hollow shaft system collides and rubs with the passing aid. The limiting function of the crossing assistor can reduce the amplitude of the multi-section hollow shaft system. Meanwhile, the rigidity and damping properties of the cross-over assistor can generate a buffer protection effect on the multi-section hollow shafting, so that the bearing system can safely and quickly pass through the critical rotating speed under smaller amplitude.
Drawings
The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for illustrative purposes only and thus do not limit the scope of the present invention. Furthermore, unless otherwise indicated, the drawings are intended to be illustrative of the structural configurations described herein only, and are not necessarily drawn to scale.
FIG. 1 is a schematic view of the installation position of the booster in the multi-section hollow shafting;
fig. 2 is a schematic view of the structure of the ring of the present invention.
In the figure:
1-a circular ring; 2-base, 3-shell, 4-hollow shaft system; 5-an elastic connecting piece; 6-contact bumps; 7-small groove; 8-big groove.
Detailed Description
First, it should be noted that the specific structures, features, advantages, etc. of the present invention will be specifically described below by way of example, but all the descriptions are for illustrative purposes only and should not be construed as limiting the invention in any way. Furthermore, any single feature described or implicit in the embodiments described herein or shown or implicit in the drawings may continue to be combined or subtracted from any single feature or equivalent thereof to obtain still further embodiments of the invention that may not be directly mentioned herein. In addition, for the sake of simplicity, the same or similar features may be indicated in only one place in the same drawing.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "disposed," "connected," "fixed," "screwed" and the like are to be understood broadly, for example, as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.
The present invention will be described in detail with reference to FIGS. 1-2.
Example 1:
the utility model provides a ware is helped in middle part of multi-section formula hollow shafting, includes the hollow shafting main part, the hollow shafting main part includes casing 3 and installs the hollow shafting 4 of multisection at casing 3 inner wall, the interior wall mounting of casing 3 helps the ware, the axis of helping the ware with the axis coincidence of hollow shafting 4, the radial axis of helping the ware with adjacent the central line coincidence between the hollow shafting 4.
The working principle is as follows:
as can be seen from the figure 1, the multi-section hollow shaft system is formed by connecting at least 2 sections of hollow shaft systems 4, elastic connecting pieces are horizontally arranged between the 2 sections of hollow shaft systems 4, two ends of the hollow shaft systems 4 are respectively connected with one elastic connecting piece connected with the shell 3, and the components form the multi-section hollow shaft system in the technical scheme. The crossing assistor is arranged on the inner wall of the shell 3, the position of the crossing assistor corresponds to the position of the central line of the 2 sections of hollow shafting 4, and the crossing assistor is also the position with the maximum deflection when the multi-section hollow shafting passes through a critical rotating speed region, so that the crossing assistor has a better limiting effect. Under the critical rotating speed, when the amplitude of the multi-section hollow shaft system is larger than the initial gap between the multi-section hollow shaft system and the passing aid, the multi-section hollow shaft system collides and rubs with the passing aid. The multi-section hollow shaft system is controlled to vibrate and respond when passing critical, so that the multi-section hollow shaft system can safely and quickly pass through critical rotating speed under smaller amplitude.
Preferably, the crossing aid comprises a base 2 fixedly connected to the inner wall of the shell 3 and a ring 1 nested in the base 2, the axis of the base 2 is coincident with the axis of the hollow shafting 4, and the radial axis of the base 2 is coincident with the central line between the adjacent hollow shafting.
Further preferably, an initial gap exists between the inner wall of the circular ring 1 and the outer wall of the hollow shaft system 4.
More preferably, the initial gap is 1 to 2mm.
The axis of the base 2 coincides with the axis of the multi-section hollow shaft system, an initial gap is ensured to exist between the surface of the ring 1 and the surface of the multi-section hollow shaft system in the radial position, and the initial gap provides buffer protection for collision and friction of the hollow shaft system 4 and the ring 1.
In the technical scheme, the initial clearance is within the range of 1-2mm, and the clearance is favorable for fully playing the limiting function of the crossing assistor. The friction coefficient of the outer surface of the circular ring 1 is set to be about 0.1, so that the friction force borne by the hollow shaft system is ensured to be at a lower level, and the external force action of the friction resistance on the hollow shaft system 4 is reduced.
Example 2:
the shape of the circular ring 1 is further improved on the basis of the embodiment 1, and the following technical scheme is obtained:
preferably, a plurality of groups of contact bumps 6 are arranged on the inner wall of the circular ring 1 at equal angles.
Further preferably, the contact bumps 6 are provided in 6 groups.
Further preferably, both sides of the contact bump 6 are recessed downward to form a small groove 7.
Further preferably, the outer wall of the circular ring 1 is equiangularly provided with a large W-shaped groove 8 corresponding to the contact bump 6.
As shown in FIG. 2, six groups of contact salient points 6 are arranged on the inner wall surface of the circular ring 1, two sides of the contact salient points 6 are sunken downwards to form small grooves 7, the shape can play a role in shock absorption during rubbing, the friction coefficient of the contact salient points 6 is about 0.1, and lower tangential friction force is provided for the rotor. Meanwhile, the outer wall of the circular ring 1 corresponding to the contact salient points 6 on the inner wall of the circular ring 1 is also provided with 6 groups of W-shaped large grooves 8, and the shock absorption effect is also achieved. By adjusting the curvature radius of the small groove and the curvature radius of the large groove, the crossing assistor can realize different radial rigidity.
The contact bumps 6 and the W-shaped large grooves 8 are not limited to 6 groups, and may have other values as long as they are distributed at equal angles on the ring 1, so that the rubbing force can be uniformly distributed to reduce the vibration.
More preferably, the ring 1 is made of a polymer material.
More preferably, the ring 1 is made of polytetrafluoroethylene. The polytetrafluoroethylene material has corrosion resistance, wear resistance, high lubricity, relatively strong aging resistance and rigidity and damping characteristics, and is suitable for being used as the material of the circular ring 1 of the passing aid.
In summary, the invention provides a middle passing aid for a multi-section hollow shaft.
The present invention has been described in detail with reference to the above examples, but the description is only for the preferred examples of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. The utility model provides a ware is helped over at hollow shafting middle part of multisection formula, includes hollow shafting main part, hollow shafting main part includes the casing and installs the hollow shafting of multisection at shells inner wall, its characterized in that: the inner wall of the shell is provided with a passing aid, the axis of the passing aid is overlapped with the axis of the hollow shaft system, and the radial axis of the passing aid is overlapped with the central line between the adjacent hollow shaft systems.
2. The multi-section hollow shafting middle passing aid of claim 1, wherein: the crossing assistor comprises a base fixedly connected to the inner wall of the shell and a circular ring nested in the base, the axis of the base is overlapped with the axis of the hollow shafting, and the radial axis of the base is overlapped with the central line between the adjacent hollow shafting.
3. The multi-section hollow shafting middle passing aid of claim 2, wherein: an initial gap exists between the inner wall of the circular ring and the outer wall of the hollow shaft system.
4. A multi-section hollow shafting middle passing aid according to claim 3, wherein: the initial gap is 1-2 mm.
5. A multi-section hollow shafting middle passing aid according to claim 3, wherein: and a plurality of groups of contact salient points are arranged on the inner wall of the circular ring at equal angles.
6. The multi-section hollow shafting middle passing aid of claim 5, wherein: the contact bumps are provided with 6 groups.
7. A multi-section hollow shafting middle passing aid as claimed in claim 5, wherein: and two sides of the contact salient point are sunken downwards to form small grooves.
8. The multi-section hollow shafting middle passing aid of claim 7, wherein: and the outer wall of the circular ring is provided with a W-shaped large groove corresponding to the contact salient point at an equal angle.
9. The multi-section hollow shafting middle passing aid according to any one of claims 1 to 8, wherein: the circular ring is made of high polymer materials.
10. The multi-section hollow shafting middle passing aid of claim 9, wherein: the ring is made of polytetrafluoroethylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211603846.5A CN115962249A (en) | 2022-12-13 | 2022-12-13 | Multi-section hollow shafting middle crossing assistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211603846.5A CN115962249A (en) | 2022-12-13 | 2022-12-13 | Multi-section hollow shafting middle crossing assistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115962249A true CN115962249A (en) | 2023-04-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211603846.5A Pending CN115962249A (en) | 2022-12-13 | 2022-12-13 | Multi-section hollow shafting middle crossing assistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115962249A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090243172A1 (en) * | 2008-03-31 | 2009-10-01 | Gm Global Technology Operations, Inc. | Resilient Vibration Isolator Having a Plurality of Bumps on an Engagement Surface Thereof |
| WO2015113541A1 (en) * | 2014-01-30 | 2015-08-06 | Technische Universität Bergakademie Freiberg | Bodies fixedly restrained at one end for parts of a system that rotate into the supercritical speed range and method for producing the bodies |
| US20160200429A1 (en) * | 2015-01-13 | 2016-07-14 | Airbus Helicopters | Damping device for a supercritical transmission shaft |
| US20170321747A1 (en) * | 2016-05-05 | 2017-11-09 | General Electric Company | Bearing damper with external support spring systems and methods |
| CN109826895A (en) * | 2019-02-26 | 2019-05-31 | 燕山大学 | A kind of granule damper for hollow shaft |
| CN110985594A (en) * | 2019-11-28 | 2020-04-10 | 南京航空航天大学 | Multi-fulcrum shafting vibration suppression device |
| CN216564346U (en) * | 2021-09-17 | 2022-05-17 | 哈尔滨奕拓信息科技有限公司 | Communication pipeline shockproof structure |
| CN217463021U (en) * | 2022-06-08 | 2022-09-20 | 重庆齿轮箱有限责任公司 | Vibration suppression device |
| CN217603256U (en) * | 2022-06-21 | 2022-10-18 | 核工业理化工程研究院 | Single-section hollow rotating shaft system-passing critical rotating speed auxiliary device |
-
2022
- 2022-12-13 CN CN202211603846.5A patent/CN115962249A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090243172A1 (en) * | 2008-03-31 | 2009-10-01 | Gm Global Technology Operations, Inc. | Resilient Vibration Isolator Having a Plurality of Bumps on an Engagement Surface Thereof |
| WO2015113541A1 (en) * | 2014-01-30 | 2015-08-06 | Technische Universität Bergakademie Freiberg | Bodies fixedly restrained at one end for parts of a system that rotate into the supercritical speed range and method for producing the bodies |
| US20160200429A1 (en) * | 2015-01-13 | 2016-07-14 | Airbus Helicopters | Damping device for a supercritical transmission shaft |
| US20170321747A1 (en) * | 2016-05-05 | 2017-11-09 | General Electric Company | Bearing damper with external support spring systems and methods |
| CN109826895A (en) * | 2019-02-26 | 2019-05-31 | 燕山大学 | A kind of granule damper for hollow shaft |
| CN110985594A (en) * | 2019-11-28 | 2020-04-10 | 南京航空航天大学 | Multi-fulcrum shafting vibration suppression device |
| CN216564346U (en) * | 2021-09-17 | 2022-05-17 | 哈尔滨奕拓信息科技有限公司 | Communication pipeline shockproof structure |
| CN217463021U (en) * | 2022-06-08 | 2022-09-20 | 重庆齿轮箱有限责任公司 | Vibration suppression device |
| CN217603256U (en) * | 2022-06-21 | 2022-10-18 | 核工业理化工程研究院 | Single-section hollow rotating shaft system-passing critical rotating speed auxiliary device |
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