CN202628594U - Novel nuclear main pump with magnetic bearing device - Google Patents
Novel nuclear main pump with magnetic bearing device Download PDFInfo
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- CN202628594U CN202628594U CN 201220083907 CN201220083907U CN202628594U CN 202628594 U CN202628594 U CN 202628594U CN 201220083907 CN201220083907 CN 201220083907 CN 201220083907 U CN201220083907 U CN 201220083907U CN 202628594 U CN202628594 U CN 202628594U
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- magnetic bearing
- main shaft
- bearing device
- bearing
- main pump
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Abstract
The utility model provides a novel nuclear main pump with a magnetic bearing device. The novel nuclear main pump with the magnetic bearing device comprises a magnetic bearing device (1), a main shaft (2), an impeller (3), a stator upper cover plate (4), a main shaft outer casing (5), a controller (6), an electromagnet (7), a flange-shaped thrust plate (8), an axial force sensor (9), a bearing outer casing (10), an antifriction bearing (11), a labyrinth seal (12), a spring (13) and a motor (14). The magnetic bearing device adopts an assembly device of the antifriction bearing and a magnetic bearing and is suitable to be used to support the main shaft (2). The main shaft drives the impeller (3) of the nuclear pump to do work for flow fluid through the motor (14). The nuclear main pump with the magnetic bearing device can achieve performances of being small in mechanical abrasion, low in workload, long in service life, high in precision and the like due to the magnetic bearing device.
Description
Technical field
The present invention relates to a kind of nuclear main pump of novel band magnetic bearing device, particularly a kind of can and with the nuclear main pump of rolling bearing and magnetic bearing device.
Background technique
At present, the nuclear main pump of knowing mainly is made up of motor, gland seal assembly and pump hydraulic part.Come supporting axle and rotational parts thereof through bearing between impeller, main shaft, the pump case, and the running accuracy of retainer shaft.At present both at home and abroad the design bearing to the nuclear main pump should be used as a lot of researchs, but overcome that the nuclear main pump is little to bearing mechanical wear, energy consumption is low, noise is little, the life-span is long, at a high speed, highi degree of accuracy, need not to lubricate, the performance requirement of no greasy dirt still has a lot of approach.
Summary of the invention
For addressing the above problem, the present invention relates to a kind of nuclear main pump with magnetic bearing device, it adopts rolling bearing and magnetic bearing composite set, through magnetic bearing, bears any one in axial load and the bearing prepressing force or both.The present invention relates to such as, the magnetic bearing device that reactor circulating cooling system center main pump assembly etc. is adopted, through this device reach little, the low wasted work of mechanical wear, life-span long, at a high speed, performance such as highi degree of accuracy is a kind of very effective method.
Realize that the technological scheme that above-mentioned purpose adopted is:
The object of the present invention is to provide a kind of magnetic bearing device, wherein, can carry out stable control, the structure of controller also can be simplified.The magnetic bearing device of the present invention's design is also with rolling bearing and magnetic bearing; Rolling bearing supporting radial load; Magnetic bearing bears any one in axial load and the bearing prepressing force or both; Electromagnet is according to vertical with main shaft and mode that the flange shape thrust plate that is formed by the strong magnetism body that be provided with is coaxially faced non-contactly is installed on the main shaft shell; Have corresponding to the output of detection effect in the sensor of axial power, the controller of control electromagnet has the relation of the values of stiffness of the synthetic spring that the supporting system by rolling bearing and rolling bearing forms greater than the values of stiffness of bearing of electromagnet.
In the magnetic bearing device of this scheme; Because and with rolling bearing and magnetic bearing; Rolling bearing bears radial load, and magnetic bearing bears any one in axial load and the bearing prepressing force or both, so carry out the good supporting of axial precision; Can guarantee simultaneously the long durability of rolling bearing, avoid the damage when only the power supply of the occasion of the supporting of magnetic bearing stops.In addition, owing to form the relation of the values of stiffness of the synthetic spring that the supporting system by rolling bearing and rolling bearing forms greater than the values of stiffness of bearing of electromagnet, so can prevent controlling frequency band, the phase delay of mechanical system is 180 ° situation.Thus, controlling object is stable, and the circuit structure of controller is the simple structure of ratio or proportional integral etc., even like this, still can carry out stable control.It is characterized in that:
The present invention is a kind of nuclear main pump of novel band magnetic bearing device; Comprise magnetic bearing device (1), main shaft (2), impeller (3), stator upper cover plate (4), main shaft shell (5), controller (6), electromagnet (7), flange shape thrust plate (8), axial force transducer (9), bearing shell (10), rolling bearing (11), labyrinth sealing (12), spring (13), motor (14); Above-mentioned magnetic bearing device; Adopt rolling bearing and magnetic bearing composite set; It is characterized in that the supporting that it is applicable to main shaft (2), this main shaft drives the acting of nuclear main pump impeller (3) convection cell through motor (14).
Beneficial effect of the present invention is: through magnetic bearing device, realized little, the performances such as wasted work is low, the life-span is long, precision height of nuclear main pump bearing mechanical wear.
The magnetic bearing that the present invention adopts is a kind of novel high-performance bearing.Compare with conventional ball bearings, sliding bearing and filmatic bearing; There is not Mechanical Contact in magnetic bearing; Rotor can reach very high running speed; Have that mechanical wear is little, energy consumption is low, noise is little, the life-span is long, need not to lubricate, advantage such as no oil pollution, particular surroundingss such as particularly suitable high speed, vacuum, ultra-clean.Can be widely used in fields such as machining, turbomachinery, Aero-Space, vacuum technique, the identification of rotor dynamics characteristic and test, be acknowledged as extremely promising novel bearing.
Description of drawings
Fig. 1 is the nuclear main pump structural drawing of the band magnetic bearing of one embodiment of the invention.
Fig. 2 is same embodiment's a magnetic bearing schematic representation.
Fig. 3 is the controller example block.
Among the figure: 1. magnetic bearing device, 2. main shaft, 3. impeller, 4. stator upper cover plate, 5. main shaft shell; 6. controller, 7. electromagnet, 8. flange shape thrust plate, 9. axial force transducer, 10. bearing shell; 11. rolling bearing, 12. labyrinth sealings, 13. springs, 14 motors.
Embodiment
Fig. 1, Fig. 2, Fig. 3 have confirmed the nuclear main pump structural type of band magnetic bearing in the present embodiment jointly; If it is by the supporting of main shaft and with rolling bearing and magnetic bearing; Rolling bearing bears radial load, and magnetic bearing bears any one in axial load and the bearing prepressing force or both, then leads axial restriction; The problem of the contact the when power supply that in addition, does not also produce the occasion of magnetic bearing stops.
Occasion at this programme; According to the mode that does not contact with the flange shape thrust plate that forms by the strong magnetism body of the vertical and coaxial setting of main shaft and face; The electromagnet of magnetic bearing is set, corresponding to the output of the sensor that detects axial power, through controller control electromagnet.
If through rolling bearing, the main shaft of supporting blade, then, limit main spindle's through the limitation function of the axial position that rolling bearing had.In the occasion of the rolling bearing of the limitation function with such axial position, the reduction of the long durability of the above-mentioned thrust of the bearing of high speed rotating becomes problem, still, because through electromagnet supporting thrust, so can guarantee the long durability of rolling bearing.
In conjunction with Fig. 1 and Fig. 2, example of the present invention is described.Fig. 1 representes to be assembled with the nuclear main pump assembly sectional view of magnetic bearing device of the present invention.This nuclear main pump assembly comprises motor, gland seal assembly and pump hydraulic part, and impeller (3) and motor are installed on the two ends of main shaft (2) respectively.Through the power that produces by motor, the acting of drives impeller (3) rotation convection cell.
Magnetic bearing device in this nuclear main pump relatively radially through bearing (11) supporting spindle (2), through constituting the electromagnet (7) of magnetic bearing, bears the thrust that acts on the main shaft (2).This nuclear main pump magnetic bearing assembly comprises sensor (9), the thrust of this sensor (9) detection effect on main shaft (2); This controller (6) is controlled the supporting force of electromagnet (7) corresponding to the output of this sensor (9).Electromagnet (7) is according in the centre of main shaft (2), and being arranged to admit with mode that the two sides of the flange shape thrust plate (8) that is formed by the strong magnetism body of the vertical and coaxial setting of main shaft (2) is faced non-contactly has on the main shaft shell (5) of main shaft.
The bearing (11) of supporting spindle (2) is a rolling bearing, has the limitation function of axial position, such as, adopt deep trouth ball bearing, angular contact ball bearing.In the occasion of deep trouth ball bearing, have two-way thrust and bear function, have the effect that the axial position of Internal and external cycle is turned back to the neutral position.This bearing (11) be arranged at impeller in the main shaft shell (5) near.
The part of the bearing (11) of main shaft shell (5) side forms according to the diameter of aperture surface near main shaft (13), on this aperture surface, forms non-contact Sealing (12).In this example, non-contact Sealing (12) constitutes labyrinth.
The sensor (9) is arranged near the Stationary side the bearing (11), that is, and and main shaft shell (5) side.The outer ring of bearing (11) that is provided with this sensor (9) nearby is embedded in the inside of bearing shell (10) at stationary state.Bearing shell (10) at one end has the inward flange that engages with the outer ring breadth of bearing (11) in the form of a ring, and is chimeric with the aperture surface that is arranged on the main shaft shell (10) according to axially displaceable mode.Inward flange is arranged at axial middle side.
The bearing (11) that sensor (9) non-is provided with side is according to main shaft shell (10) relatively; The mode that moves vertically is provided with; And through bearing prepressing force spring (13) flexibly supporting sensor (9) distribute and to be arranged at, the breadth of the inward flange side of being located at the bearing shell of being situated between and being fixed between the electromagnet (7) of the parts on the main shaft shell (5) around a plurality of positions of the circumferencial direction of main shaft (2).In addition, in sensor (9), add precompressed through sensor loaded spring (13).Sensor loaded spring (13) is setovered the outer ring that is received in the bearing (11) in the admittance recess that is located on the main shaft shell (5) vertically, through outer ring and bearing shell, sensor (9) is carried out precompressed.Sensor loaded spring (13) is by being arranged at around the formations such as helical spring at a plurality of positions of circumferencial direction of main shaft (2).
Owing to pass through pressing force; Detect the sensor (9) of thrust even moving of the axial any direction relative to main shaft (2); Still can detect,, act on the above value of average thrust on the main shaft (2) so the precompressed of sensor loaded spring (13) is the common operating condition of nuclear main pump.
The mechanical model of above-mentioned magnetic bearing device can constitute through simple spring system.That is, this spring system is following scheme, and wherein, the synthetic spring that is made up of the supporting system (sensor loaded spring (13), bearing shell etc.) of bearing (11) and these bearings and the spring of electromagnet (7) are arranged side by side.In this spring system; The synthetic spring that is made up of the supporting system of these bearings of bearing (11) has the edge direction opposite with direction of displacement and the rigidity that act on proportional with displacement amount; Relative this situation, the spring of electromagnet (7) have the negative rigidity along direction of displacement and the proportional effect of displacement amount.
Thus, the magnitude relationship in the rigidity of the spring of above-mentioned synthetic spring and electromagnet is:
The negative values of stiffness of the rigidity＜electromagnet of synthetic spring ... (1)
180 ° of the phase delays of mechanical system form unsettled system, thus, in the controller (6) of control electromagnet (7), additive phase compensating circuit in advance, the complex structure of controller (6).
So in the magnetic bearing device of this example, the magnitude relationship of the rigidity of the spring of the rigidity of above-mentioned synthetic spring and electromagnet (7) is:
The negative values of stiffness of the rigidity＞electromagnet of synthetic spring ... (2)
As, the magnitude relationship of the rigidity of the spring through setting above-mentioned synthetic spring and electromagnet can prevent in control frequency band, the situation that the phase delay of mechanical system is 180 °.Thus, can make the controlling object of controller (6) stable, but image pattern 3 that kind, and proportionally, or proportional integral constitutes the circuit structure of controller (6) simply.
In controller (6),, detection output P1, the P2 of each sensor (9) carried out signed magnitude arithmetic(al) through sensor output arithmetic circuit (14) by the Fig. 3 shown in the skeleton diagram; Through comparator (15); This operation result is compared with the desired value of benchmark setting device (16), deviation is carried out computing, also through PI compensating circuit (or P compensating circuit) (17); To the deviation of computing; It is corresponding and proportional integral (or ratio) that suitably set is handled to carry out magnetic bearing device (1), thus, the control signal of electromagnet (9) is carried out computing.The output of PI compensating circuit (or P compensating circuit) (17) is via diode (18), (19), be input to drive each to the power circuit (20), (21) of electromagnet (7a), (7b) in.Electromagnet (7a), (7b) the pair of electrical magnet (7) for facing with thrust plate (8) shown in Figure 2 only acts on attractively, thus, confirms sense of current through diode (18), (19) in advance, drives 2 electromagnet (7a), (7b) selectively.
Like this; In the example that is applicable to magnetic bearing device 1; Because the magnitude relationship of the negative rigidity of the spring of above-mentioned synthetic spring of setting and electromagnet (7) as (2) formula; So can form the stable scheme of controlling object that makes controller (6), the circuit arrangement that can make controller (6) is the simple proposal of ratio or proportional integral.
Claims (1)
1. the nuclear main pump of a novel band magnetic bearing device; Comprise magnetic bearing device (1), main shaft (2), impeller (3), stator upper cover plate (4), main shaft shell (5), controller (6), electromagnet (7), flange shape thrust plate (8), axial force transducer (9), bearing shell (10), rolling bearing (11), labyrinth sealing (12), spring (13), motor (14); Above-mentioned magnetic bearing device; Adopt rolling bearing and magnetic bearing composite set; It is characterized in that the supporting that it is applicable to main shaft (2), this main shaft drives the acting of nuclear main pump impeller (3) convection cell through motor (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220083907 CN202628594U (en) | 2012-03-08 | 2012-03-08 | Novel nuclear main pump with magnetic bearing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220083907 CN202628594U (en) | 2012-03-08 | 2012-03-08 | Novel nuclear main pump with magnetic bearing device |
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| Publication Number | Publication Date |
|---|---|
| CN202628594U true CN202628594U (en) | 2012-12-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220083907 Expired - Fee Related CN202628594U (en) | 2012-03-08 | 2012-03-08 | Novel nuclear main pump with magnetic bearing device |
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| CN (1) | CN202628594U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103953571A (en) * | 2014-05-20 | 2014-07-30 | 无锡杰尔压缩机有限公司 | Flexible supporting structure for fan bearing |
| CN106286379A (en) * | 2016-08-26 | 2017-01-04 | 长沙佳能通用泵业有限公司 | Pump axial force on-line measurement device and method |
| CN107299938A (en) * | 2016-12-07 | 2017-10-27 | 江苏国泉泵业制造有限公司 | A kind of vertical magnetic thrust bearing of magnetic fluid medium lubrication |
-
2012
- 2012-03-08 CN CN 201220083907 patent/CN202628594U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103953571A (en) * | 2014-05-20 | 2014-07-30 | 无锡杰尔压缩机有限公司 | Flexible supporting structure for fan bearing |
| CN106286379A (en) * | 2016-08-26 | 2017-01-04 | 长沙佳能通用泵业有限公司 | Pump axial force on-line measurement device and method |
| CN106286379B (en) * | 2016-08-26 | 2019-03-05 | 长沙佳能通用泵业有限公司 | Pump axial force on-line measurement device and method |
| CN107299938A (en) * | 2016-12-07 | 2017-10-27 | 江苏国泉泵业制造有限公司 | A kind of vertical magnetic thrust bearing of magnetic fluid medium lubrication |
| CN107299938B (en) * | 2016-12-07 | 2018-11-30 | 江苏国泉泵业制造有限公司 | A kind of vertical magnetic thrust bearing of magnetic fluid medium lubrication |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121226 Termination date: 20140308 |