CN104295518B - For the magnetic suspension overspeed test bench of impeller overspeed testing - Google Patents

For the magnetic suspension overspeed test bench of impeller overspeed testing Download PDF

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Publication number
CN104295518B
CN104295518B CN201410510333.9A CN201410510333A CN104295518B CN 104295518 B CN104295518 B CN 104295518B CN 201410510333 A CN201410510333 A CN 201410510333A CN 104295518 B CN104295518 B CN 104295518B
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China
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impeller
rotor
overspeed
protective housing
motor casing
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CN104295518A (en
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胡思宁
丁嵩
李健
吴立华
董继勇
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Nanjing Cigu Technology Co Ltd
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Nanjing Cigu Technology Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/001Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The present invention discloses a kind of magnetic suspension overspeed test bench for impeller overspeed testing, it comprises support and is installed on the main frame on support, electric control cubicle and vacuum pump, main frame comprises motor casing, be installed on the rotor in motor casing and electronics stator, the upper end of rotor extends beyond on the upper-end surface of motor casing, on rotor is provided with, lower radial direction magnetic bearing, on, lower thrust magnetic bearing and thrust disc, safety joint and the pull bar screw that impeller to be fixed thereon end by one is connected with at the upper end of rotor, position motor casing is positioned at around impeller is provided with protective housing, protection cover-cap installed by protective housing, motor casing upper surface, protective housing and protection cover-cap are jointly formed and impeller are wrapped in interior seal container, protective housing inwall installs buffer stopper, protection cover-cap is formed with vacuumizing joint, vacuumizing joint installs vacuum-pumping tube, the other end of vacuum-pumping tube is connected on vacuum pump.

Description

For the magnetic suspension overspeed test bench of impeller overspeed testing
Technical field:
The present invention relates to a kind of impeller overspeed testing testing apparatus, particularly a kind of magnetic suspension overspeed test bench for impeller overspeed testing.
Background technique:
Traditional centrifugal fan is do the machine hypervelocity mostly, namely utilizes original blower fan main frame, reaches rotating speed needed for overspeed test by slightly improving rotating speed.But this test method needs blower fan overall structure to leave higher safe clearance (at least 30%), and during real work, waist performance is also larger; Once occur that the accidents such as impeller fragmentation will cause blower fan entirety to scrap simultaneously in testing, the safety of tester is also difficult to be protected.Therefore blower fan is adapted as special overspeed test bench to carry out overspeed test by some enterprises.The typical technological scheme of overspeed test bench domestic is at present:
1. use common asynchronous AC motor as power;
2. use toothed belt transmission or stage-geared;
3. use sliding bearing;
4. use film damper to suppress rotor oscillation.
Although existing overspeed test bench also can carry out the overspeed test of quick runner, it has following shortcoming:
1. adopt asynchronous AC motor as power.Because its rotor and stator field exist speed discrepancy, rotor speed is unstable and be difficult to control, so extra speed probe and controller must be used to carry out stabilization vane wheel speed, system complex, volume are large, expensive.
2. motor output speeds is low, therefore needs multi-stage acceleration gear, even multiple gear-box to connect and just can reach desired speed.Along with increasing of progression, gear-driven efficiency reduces, noise and heating value all increases, rate of fault significantly improves, and even easily occurs the major accidents such as self-locking.Although and adopt toothed belt transmission can obtain larger single staged transmission ratio, its load and life-span are far below gear transmission.Therefore such overspeed test bench complex structure, expensive, efficiency and Reliability comparotive are low.
3. the rotational speed regulation narrow range of asynchronous AC motor, and the hypervelocity rotating speed of different impeller differs greatly, therefore such overspeed test bench want compatibility more Multi-impeller just only have two kinds of selections: adopt complicated speed-change gear box, or change different gear-boxes according to different impeller.Last selection easy-to-operat but improve price; Rear one selects then to add experiment work amount.
4., because adopt the needs of sliding bearing and film damper and high-speed gear box lubrication, special lubrication system must be equipped with, not only increase the complexity of system, also cannot avoid the faults such as evaporating, emitting, dripping or leaking of liquid or gas.Sliding bearing needs the lubricant oil of different viscosities in different speed range, cannot change easily in existing structure; Simultaneously rotating speed is higher, and the heating value of sliding bearing and gear-box is also higher, needs to arrange oil cooler and carrys out cutting oil, so cause system complex and volume is large.
5. impeller is arranged on high speed gear shaft, and because high gear diameter is little, therefore the quality of high speed shaft is also smaller.When rotor quality declines, ensure that identical dynamic balance performance just needs less mass shift amount; But overspeed test bench needs are frequent changes test impeller, the conformity of impeller is difficult to ensure, is thus work when dynamic balance performance is poor when majority.Lighter rotor just means larger vibration, even if the film damper also very difficult guarantee rotor stability that operation technique is very difficult.
Therefore, necessary the deficiency solving prior art is improved to prior art.
Summary of the invention:
In order to overcome above-mentioned technical problem, the invention provides a kind of simple and reliable for structure, rotational speed regulation scope wide and control the precise and stable magnetic suspension overspeed test bench for impeller overspeed testing.
The present invention adopts following technological scheme: a kind of magnetic suspension overspeed test bench for impeller overspeed testing, it comprises support and is installed on the main frame on support, electric control cubicle and vacuum pump, described main frame comprises motor casing, be installed on the rotor in motor casing and electronics stator, the upper end of described rotor extends beyond on the upper-end surface of motor casing, the position that described rotor is positioned at motor stator upper and lower is separately installed with radial direction magnetic bearing, lower radial direction magnetic bearing, position rotor is positioned at below lower radial direction magnetic bearing is provided with lifting force magnetic bearing, lower thrust magnetic bearing and the thrust disc between lifting force magnetic bearing and lower thrust magnetic bearing, the upper end of described rotor is fixedly connected with the safety joint and pull bar screw of impeller being fixed on end on rotor, the position described motor casing is positioned at around impeller is provided with a columnar protective housing, described protective housing upper end is provided with protection cover-cap, described motor casing upper surface, protective housing and protection cover-cap jointly form one and impeller are wrapped in interior cylindrical shape seal container, described protective housing inwall is provided with buffer stopper, described protection cover-cap is formed the vacuumizing joint running through protection cover-cap upper and lower surface, described vacuumizing joint is provided with vacuum-pumping tube, the other end of described vacuum-pumping tube is connected on vacuum pump.
Further, the outside diameter of described protective housing is identical with the outer peripheral diameter of the upper surface of motor casing, and the outside diameter of described protection cover-cap equals the outside diameter of protective housing.
Further, described buffer stopper comprise be installed on protective housing inwall and equidistantly arrange round the circumference of impeller several.
Further, described safety joint comprises the less upper cylinder part of outside diameter and the larger lower cylinder part of outside diameter, described safety joint is formed the through hole running through safety joint upper and lower surface, the position that cylinder part up and down cylinder part is connected on described has been recessed to form annular incision, and described annular incision is not connected with through hole.
Further, the groove for accommodating fixing lower cylinder part is formed with at the upper distal tip of described rotor.
Further, together with the lower end of described pull bar screw is tightened in rotor after the upper surface of impeller is arranged in the central shaft hole of impeller and through hole successively.
Further, described pull bar screw is formed with screw otch with the position of annular incision phase lateral alignment.
Further, described buffer stopper is lead.
The present invention has following beneficial effect:
1. adopt contactless magnetic bearing, structure is simple, clean, unrestricted to maximum speed.
When adopting contactless magnetic bearing, rotor is in state of suspension rotation does not have Mechanical Contact with surrounding components, also just do not rub, wear and tear and generate heat, therefore the maximum speed of rotor only depends on natural frequency and the resistance of air of self, magnetic bearing is without the need to lubrication simultaneously, except coil and magnetic core, there is no other thermals source yet, so only need to utilize motor cooling air to cool, do not need complicated lubrication system and cooling system.
3. simply, dynamic balance performance is good for rotor and impeller linking structure.
Rotor is connected without the need to passing through gear-box speedup with impeller, therefore structure is simple, avoid the fault of overdrive gear, also without the need to extra lubrication and cooling, the quality of rotor is usually much larger than the quality of impeller simultaneously, inertia also improves the resistivity of offset mass after increasing, and also decreases the requirement of dynamic balance of impeller precision.
4. large, the good rigidly of large, the diameter of quality of rotor of motor, the ability to bear of impact loading is also higher, there is local failure in impeller, even completely broken time rotor be also not easy to damage.
5. rotor and impeller adopt safe connection equipment to be connected, and when impeller is subject to serious impact, this device first ruptures, to ensure that rotor and magnetic bearing are not damaged.
6. adopt steel protective housing built-in buffer stopper, not only protect operator from debris hazard, also prevent fragment from rebounding and destroy impeller and rotor.
7. vacuumize in protective housing to reduce the stirring of impeller to air, thus reduce motor power consumption, impeller heating and upper and lower thrust magnetic bearing load.
8. except main frame, electric control cubicle and vacuum pump, do not need extra supplementary equipment, thus cost is low, volume is little, easy and simple to handle, compared with existing overspeed test bench, magnetic suspension overspeed test bench for impeller overspeed testing eliminates step-up gear, lubrication system, oil cooling system, revolution speed control system, therefore cost and volume reduce all greatly, and operation amount, maintenance workload and rate of fault all greatly reduce.
Accompanying drawing illustrates:
Fig. 1 is the structural representation of the present invention for the magnetic suspension overspeed test bench of impeller overspeed testing.
Fig. 2 is the structural representation of the present invention for main frame in the magnetic suspension overspeed test bench of impeller overspeed testing.
Fig. 3 is the partial structurtes schematic diagram of the present invention for main frame in the magnetic suspension overspeed test bench of impeller overspeed testing.
Wherein:
1-support; 2-main frame; 3-electric control cubicle; 4-vacuum pump; 5-motor casing; 6-rotor; 7-motor stator; 8-first radial direction magnetic bearing; 9-second radial direction magnetic bearing; 10-lifting force magnetic bearing; 11-impeller; 12-safety joint; The upper cylinder part of 120-; Cylinder part under 121-; 122-through hole; 123-annular incision; 13-pull bar screw; 130-screw otch; 14-protective housing; 15-buffer stopper; 16-protection cover-cap; 160-vacuumizing joint; 17-vacuum-pumping tube; Thrust magnetic bearing under 18-; 19-thrust disc.
Embodiment:
Please refer to shown in Fig. 1 to Fig. 3, the magnetic suspension overspeed test bench that the present invention is used for impeller overspeed testing comprises support 1 and is installed on main frame 2, electric control cubicle 3 and the vacuum pump 4 on support 1.Main frame 2 comprises motor casing 5, be installed on the rotor 6 in motor casing 5 and electronics stator 7, wherein the upper end of rotor 6 extends beyond on the upper-end surface of motor casing 5, the position that rotor 6 is positioned at motor stator 7 upper and lower is separately installed with radial direction magnetic bearing 8 and lower radial direction magnetic bearing 9, position rotor 7 is positioned at below lower radial direction magnetic bearing 9 is provided with lifting force magnetic bearing 10, lower thrust magnetic bearing 18 and the plate-like thrust disc 19 between lifting force magnetic bearing 10 and lower thrust magnetic bearing 18, the upper end of rotor 6 is fixedly connected with the safety joint 12 and pull bar screw 13 of impeller 11 being fixed on end on rotor 6, position motor casing 5 is positioned at around impeller 11 is provided with a columnar protective housing 14, there is protection cover-cap 16 protective housing 14 upper end, motor casing 5 upper surface, protective housing 14 and protection cover-cap 16 jointly form one and impeller 11 are wrapped in interior cylindrical shape seal container, protective housing 14 inwall is provided with buffer stopper 15, protection cover-cap 16 is formed the vacuumizing joint 160 running through protection cover-cap 16 upper and lower surface, vacuumizing joint 160 is provided with vacuum-pumping tube 17, the other end of vacuum-pumping tube 17 is connected on vacuum pump 4.
Wherein the outside diameter of protective housing 14 is identical with the outer peripheral diameter of the upper surface of motor casing 5, and the height of protective housing 14 is higher than the height of impeller 11, and the outside diameter of protection cover-cap 16 equals the outside diameter of protective housing 14.Buffer stopper 15 comprise be installed on protective housing 14 inwall and equidistantly arrange round the circumference of impeller 11 several, wherein the upper surface of buffer stopper 15 is positioned at the below of the upper surface of protective housing 14, buffer stopper 15 lead or other can absorb the soft material manufacture of impact force, the impact of impeller fragment can be absorbed and wrapped up, rebounding after avoiding direct debris impact protective housing.
Wherein impeller 11 is fixed on the upper end of rotor 6 by safety joint 12 location.The material that safety joint 12 adopts intensity lower is made.Safety joint 12 is roughly in the cylindrical structure of " ⊥ " shape shape, and it comprises the less upper cylinder part 120 of upper end outside diameter and the larger lower cylinder part 121 of lower end outside diameter.Meanwhile, safety joint 12 is formed with the through hole 122 running through safety joint 12 upper and lower surface, the position be wherein connected at upper cylinder part 120 up and down cylinder part 121 has been recessed to form annular incision 123, and wherein annular incision 123 is not connected with through hole 122.The groove (sign) for accommodating fixing lower cylinder part 121 is formed at the upper distal tip of rotor 6.The central shaft hole of impeller 11 matches with the upper cylinder part 120 of safety joint 12, and impeller 11 and upper cylinder part 120 is connected together by key (not shown).By being recessed to form annular incision 123 at the position that the upper cylinder part 120 up and down cylinder part 121 of safety joint 12 is connected in the present invention, now when impeller is subject to larger lateral impact forces, safety joint 12 can be ruptured along annular incision 123, thus avoids damaging rotor 6.
Together with the lower end of pull bar screw 13 is tightened in rotor 6 after the upper surface of impeller 11 is arranged in the central shaft hole of impeller and through hole 122 successively, wherein the upper end of pull bar screw 13 fastens on the upper surface of impeller 11 and then by impeller 11 axial compression and rotor 6.Pull bar screw 13 is formed with screw otch 130 with the position of annular incision 123 phase lateral alignment.
Lateral shear effect can be produced at screw otch 130 place when safety joint 12 is ruptured, thus cut off pull bar screw 13, allow impeller and rotor depart from, avoid impact force to damage rotor.Depart from the impeller 11 of rotor 6 can be absorbed in buffer stopper 7 and stopping, fragment then can be contained by protective housing in order to avoid fly out and hurt sb.'s feelings, and cut-off hypomere screw head can take out with fixture after taking off safety joint 12.
The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, can also make some improvement under the premise without departing from the principles of the invention, and these improvement also should be considered as protection scope of the present invention.

Claims (8)

1. the magnetic suspension overspeed test bench for impeller overspeed testing, it comprises support (1) and is installed on the main frame (2) on support (1), electric control cubicle (3) and vacuum pump (4), it is characterized in that: described main frame (2) comprises motor casing (5), be installed on the rotor (6) in motor casing (5) and electronics stator (7), the upper end of described rotor (6) extends beyond on the upper-end surface of motor casing (5), the position that described rotor (6) is positioned at motor stator (7) upper and lower is separately installed with upper radial direction magnetic bearing (8), lower radial direction magnetic bearing (9), the position that rotor (7) is positioned at lower radial direction magnetic bearing (9) below is provided with lifting force magnetic bearing (10), lower thrust magnetic bearing (18) and the thrust disc (19) be positioned between lifting force magnetic bearing (10) and lower thrust magnetic bearing (18), the upper end of described rotor (6) is fixedly connected with the safety joint (12) and pull bar screw (13) of impeller (11) being fixed on the upper end of rotor (6), described motor casing (5) is positioned at impeller (11) position around and one columnar protective housing (14) is installed, described protective housing (14) upper end is provided with protection cover-cap (16), described motor casing (5) upper surface, protective housing (14) and protection cover-cap (16) jointly form one and impeller (11) are wrapped in interior cylindrical shape seal container, described protective housing (14) inwall is provided with buffer stopper (15), described protection cover-cap (16) is formed the vacuumizing joint (160) running through protection cover-cap (16) upper and lower surface, described vacuumizing joint (160) is provided with vacuum-pumping tube (17), the other end of described vacuum-pumping tube (17) is connected on vacuum pump (4).
2. as claimed in claim 1 for the magnetic suspension overspeed test bench of impeller overspeed testing, it is characterized in that: the outside diameter of described protective housing (14) is identical with the outer peripheral diameter of the upper surface of motor casing (5), the outside diameter of described protection cover-cap (16) equals the outside diameter of protective housing (14).
3., as claimed in claim 2 for the magnetic suspension overspeed test bench of impeller overspeed testing, it is characterized in that: described buffer stopper (15) comprise be installed on protective housing (14) inwall and equidistantly arrange round the circumference of impeller (11) several.
4. as claimed in claim 3 for the magnetic suspension overspeed test bench of impeller overspeed testing, it is characterized in that: described safety joint (12) comprises the less upper cylinder part (120) of outside diameter and the larger lower cylinder part (121) of outside diameter, described safety joint (12) is formed the through hole (122) running through safety joint (12) upper and lower surface, the position that cylinder part (120) up and down cylinder part (121) are connected on described has been recessed to form annular incision (123), described annular incision (123) is not connected with through hole (122).
5. as claimed in claim 4 for the magnetic suspension overspeed test bench of impeller overspeed testing, it is characterized in that: be formed with the groove for accommodating fixing lower cylinder part (121) at the upper distal tip of described rotor (6).
6. as claimed in claim 5 for the magnetic suspension overspeed test bench of impeller overspeed testing, it is characterized in that: the lower end of described pull bar screw (13) is arranged in together with the central shaft hole of impeller and through hole (122) be tightened in rotor (6) afterwards from the upper surface of impeller (11) successively.
7. as claimed in claim 6 for the magnetic suspension overspeed test bench of impeller overspeed testing, it is characterized in that: be above formed with screw otch (130) with the position of annular incision (123) phase lateral alignment described pull bar screw (13).
8. as the magnetic suspension overspeed test bench in claim 1-7 as described in any one, it is characterized in that: described buffer stopper (15) is lead.
CN201410510333.9A 2014-09-28 2014-09-28 For the magnetic suspension overspeed test bench of impeller overspeed testing Active CN104295518B (en)

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CN106357052A (en) * 2016-09-26 2017-01-25 南京磁谷科技有限公司 Air cooling structure of magnetic suspension motor
CN107469168B (en) * 2017-09-30 2024-04-02 北京安生生物技术有限责任公司 Single-degree-of-freedom magnetic suspension centrifugal impeller for reducing thrombus
CN107701596A (en) * 2017-10-30 2018-02-16 南京磁谷科技有限公司 A kind of top chock in overspeed test bench main frame
CN107643173B (en) * 2017-10-30 2023-09-22 南京磁谷科技有限公司 Impeller mounting structure in overspeed test bed
CN107643172B (en) * 2017-10-30 2023-11-24 南京磁谷科技有限公司 Mounting structure of upper angular contact bearing in overspeed test stand host
CN107806437B (en) * 2017-12-04 2023-09-22 南京磁谷科技有限公司 Cooling system of magnetic suspension fan impeller overspeed test bed
CN107831005A (en) * 2017-12-04 2018-03-23 南京磁谷科技有限公司 A kind of magnetic suspension draught fan impeller overspeed test bench cover plate dolly
CN110056574B (en) * 2019-04-17 2020-02-21 山东天瑞重工有限公司 Magnetic bearing for high-speed magnetic suspension motor
CN115575673B (en) * 2022-11-11 2023-03-14 四川新川航空仪器有限责任公司 Vacuum high-rotation-speed test platform and test method for tone wheel

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JPS62203040A (en) * 1986-03-03 1987-09-07 Koyo Seiko Co Ltd Spin tester
JP3488696B2 (en) * 2001-02-19 2004-01-19 丸和電機株式会社 High-speed rotation test equipment
CN103604587A (en) * 2013-08-27 2014-02-26 杭州海罗马科技有限公司 High-speed rotation testing machine and method for testing high-speed rotation strength performance of rotor
CN204126937U (en) * 2014-09-28 2015-01-28 南京磁谷科技有限公司 For the magnetic suspension overspeed test bench of impeller overspeed testing

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Address after: No. 99, Jinxin Middle Road, Jiangning District, Nanjing City, Jiangsu Province

Patentee after: Nanjing Cigu Technology Co., Ltd

Address before: Nine No. 211102 Bamboo Road, Jiangning Development Zone, Nanjing, Jiangsu, 100

Patentee before: NANJING CIGU LIMITED Corp.