CN103758783B - A kind of control rod drive mechanisms (CRD) cooling blower blade reducing root bending stress - Google Patents
A kind of control rod drive mechanisms (CRD) cooling blower blade reducing root bending stress Download PDFInfo
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- CN103758783B CN103758783B CN201410052878.XA CN201410052878A CN103758783B CN 103758783 B CN103758783 B CN 103758783B CN 201410052878 A CN201410052878 A CN 201410052878A CN 103758783 B CN103758783 B CN 103758783B
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- control rod
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Abstract
The present invention discloses a kind of control rod drive mechanisms (CRD) cooling blower blade reducing root bending stress, described cooling blower comprises bearing, fan body, exhaust outlet Taper Pipe and air-valve, wherein said fan body comprises air duct, described air duct lower end is provided with intake grill, described air duct inside is provided with movable vane successively, wheel hub, stator, interior casing and driving blower fan, described driving assembling is in described interior casing, described movable vane is by blade, blade root and petiole composition, the each centroid of section of described blade is front bent arc, described blade center leans forward in described blade root along airflow direction.Disclosed a kind of control rod drive mechanisms (CRD) cooling blower blade reducing root bending stress, has structure simply novel, reduces root bending stress, reduces stall flutter district, improve the safety reliability of cooling blower.
Description
Technical field
The present invention relates to a kind of cooling blower, be specifically related to a kind of control rod drive mechanisms (CRD) cooling blower blade reducing root bending stress.
Background technique
Control rod drive mechanisms (CRD) cooling blower is a kind of for generation Ⅲ nuclear power unit integration heap top component control rod drive mechanisms (CRD) ventilation cooling system, its effect is for control rod drive mechanisms (CRD) provides forcing functions air, normally to work required temperature to maintain control rod drive mechanisms (CRD) coil block, and being no more than limit value, the performance of this blower fan directly affects the safety and reliability of reactor driving mechanism.
Because control rod drive mechanisms (CRD) cooling blower requires that pressure is higher, therefore blade root bears larger aerodynamic force moment of flexure.Again because assembling is in containment vessel, require that blade takes radiation hardness, corrosion resistant stainless steel material, and stainless density is larger, wheel speed is high again, therefore the centrifugal force that root of blade bears is larger, claimed structure reduces as far as possible most dangerouse cross-section---blade root section stress, to improve safety reliability.
Performance requires stable work area is wide, guarantee that operating point is away from stall flutter district, the alternation pneumatic power of bearing surge to avoid root of blade and causing.Because control rod drive mechanisms (CRD) cooling blower requires that pressure is high, size is little, therefore blade has the feature of large established angle, macrobending angle, easily stall, and existing this kind of blower fan surge area is comparatively obvious, and pumping point is close to blower fan best efficiency point, there is potential safety hazard.
Summary of the invention
Goal of the invention: in order to solve the deficiencies in the prior art, the invention provides a kind of reduction root bending stress, reduces stall flutter district, improve the control rod drive mechanisms (CRD) cooling blower blade of the reduction root bending stress of safety reliability.
The object of the invention is by such technological scheme realize, a kind of control rod drive mechanisms (CRD) cooling blower blade reducing root bending stress, described cooling blower comprises bearing, fan body, exhaust outlet Taper Pipe and air-valve, wherein said fan body comprises air duct, described air duct lower end is provided with intake grill, described air duct inside is provided with movable vane successively, wheel hub, stator, interior casing and drive motor, described drive motor is arranged in described interior casing, described movable vane is by blade, blade root and petiole composition, the each centroid of section of described blade is front bent arc, described blade center leans forward in described blade root along airflow direction.
Described movable vane is radiation hardness stainless steel.
The corresponding air duct position of blade tip of described movable vane is provided with anti-surge ring, is provided with plural guide plate in described anti-surge ring.
Described stator is wing blade.
Diffusion tail cone is also equipped with in described interior casing upper end.
Compared with prior art, disclosed a kind of control rod drive mechanisms (CRD) cooling blower blade reducing root bending stress, because blade center of gravity leans forward along carrying out flow path direction, the centrifugal force moment of flexure that blade centrifugal force produces blade root cross section is contrary with the moment of flexure direction that aerodynamic force produces blade root cross section, the total moment of flexure in blade root cross section reduces even to can be zero, thus reduce blade root section flexure stress, improve safety reliability, simultaneously, after control rod drive mechanisms (CRD) cooling blower adopts forward blade of the present invention, the corresponding flow of pumping point reduces 5 ~ 10%, namely surge area is reduced, expand stable operation district, thus improve fan blade operational reliability.
Accompanying drawing explanation
Fig. 1 is the structural representation of control rod drive mechanisms (CRD) cooling blower of the present invention;
Fig. 2 is the partial enlarged drawing of Fig. 1;
Fig. 3 is movable vane schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing of the present invention, clear, complete description is carried out to the technological scheme of the embodiment of the present invention.
As shown in Figure 1, the anti-surge ring mechanism of disclosed a kind of control rod drive mechanisms (CRD) cooling blower, it is vertical exhaust structure straight up, specifically comprise fan body, described fan body is fixed on basis by vibration damping holder 0, described fan body comprises air duct 1, described air duct 1 two ends are respectively equipped with intake grill 2 and exhaust outlet 3, described air duct inside is provided with movable vane 4 from bottom to up successively, wheel hub 5, stator 6, interior casing 7, drive motor 8 and diffusion tail cone 9, described exhaust outlet 3 connects exhaust outlet Taper Pipe 10, the exhaust outlet of described exhaust outlet Taper Pipe 10 is provided with air-valve 11.
Particularly, described air duct 1 forms annular pass with described interior casing 7 and is vented to described exhaust outlet Taper Pipe 10, diffusion tail cone 9 is equipped with in described interior casing 7 upper end, described drive motor 8 is built in described interior casing 7, described diffusion tail cone 9 is coated on outside described drive motor 8, described diffusion tail cone 9 cross section is trapezium structure, and monolateral angle of flare α is 5 ~ 20 °, best monolateral angle of flare α is 15 °, the radius of described diffusion tail cone 9 reduces gradually along airflow direction, flow area is increased gradually, so reduce exhaust velocity and dynamic pressure value, increase static air pressure value.
Described air duct 1 is cylindrical structural, and its upper end connects exhaust outlet Taper Pipe 10, and the monolateral angle of flare β of described exhaust outlet Taper Pipe 10 is 5 ~ 20 °, and the Taper Pipe exhaust outlet internal diameter of described exhaust outlet Taper Pipe 10 is 1100mm.
Described air-valve 11 is arranged on the exhaust outlet of described exhaust outlet Taper Pipe 10, and when blower fan is out of service, prevent outer gas stream to pour in down a chimney in blower fan, its internal diameter size is identical with the exhaust outlet internal diameter of described exhaust outlet Taper Pipe.
As shown in Figure 2, the air duct position corresponding to blade tip front end of described movable vane 4 is provided with anti-surge ring 12, described anti-surge ring 12 outside is circular groove 13, plural guide plate 14 is along the circumferential direction evenly provided with in described circular groove 13, guide ring 15 is provided with inside described guide plate 14, described guide ring 15 internal diameter is identical with described air duct 1 bottom 102 internal diameter, when system resistance increases, the movable vane 4 inlet air flow angle of attack increases, movable vane 4 suction surface air-flow is seriously separated, and form eddy current in movable vane 4 leading edge, eddy current enters anti-surge ring 12 under centrifugal action, due to the obstruct of profile groove 13, air-flow can only enter in the divider passages of guide plate 14 and guide ring 15 composition, eddy current air mass is through separating, turn back to after rectification in main air flow, make further developing of eddy current suppressed, thus eliminate surge area, air-flow no longer thermal agitation before and after movable vane 4 simultaneously, avoid movable vane 4 and bear larger alternation pneumatic power, improve the safety reliability of movable vane 4.
Described stator 6 is wing blade structure, effectively reclaims described movable vane 4 and goes out entraining air stream winding speed kinetic energy, improve fan performance, improve safety reliability.
As shown in Figure 3, described movable vane 4 adopts radiation hardness stainless steel, comprise blade 41, blade root 42 and petiole 43, the each centroid of section of wherein said blade 41 is front bent arc, described blade 41 center is leaned forward in described blade root 42 along airflow direction, setting blade center of gravity is C and blade root kernel of section O is a along carrying out flow path direction offset distance, Aerodynamic force action making a concerted effort for P in blade, its point of resultant force is H, be h to the arm of force in blade root cross section, blade root centrifugal force be Fc wherein: blade root cross section centrifugal force moment M c=Fc*a; Blade root cross section aerodynamical moment Mp=P*h; Total moment M=the P*h-Fc*a in blade root cross section.
Under designed in advance rotating speed and pressure, blade center of gravity side-play amount a=P*h/Fc can be determined.
I.e. most dangerouse cross-section---total moment M=0, blade root cross section, flexural stress=0, therefore the flexural stress that blade root moment of flexure causes can significantly reduce to be even zero, thus improve the blade safety reliability of High Rotation Speed, again because blade is antecurvature, the synergistic effect of small flow condition air-flow obstruction along blade height can be delayed, thus improve operational reliability.
The anti-surge ring mechanism of disclosed a kind of control rod drive mechanisms (CRD) cooling blower, its working principle is: gas sucks from intake grill 2, after the movable vane 4 of over-rotation is done manual work, flow into stator and carry out diffusion, and after exhaust outlet 3 through the annular pass that air duct 1 and interior casing 7 are formed be vented, gas is discharged by exhaust outlet Taper Pipe 10.
Technology contents of the present invention and technical characteristics have disclosed as above; but those of ordinary skill in the art still may do all replacement and the modification that do not deviate from spirit of the present invention based on announcement of the present invention; therefore; scope should be not limited to the content that embodiment discloses; and various do not deviate from replacement of the present invention and modification should be comprised, and contained by present patent application claim.
Claims (5)
1. one kind reduces the control rod drive mechanisms (CRD) cooling blower blade of root bending stress, described cooling blower comprises bearing, fan body, exhaust outlet Taper Pipe and air-valve, wherein said fan body comprises air duct, described air duct lower end is provided with intake grill, described air duct inside is provided with movable vane successively, wheel hub, stator, interior casing and drive motor, described drive motor is arranged in described interior casing, it is characterized in that: described movable vane is by blade, blade root and petiole composition, the each centroid of section of described blade is front bent arc, described blade center leans forward in described blade root along airflow direction.
2. the control rod drive mechanisms (CRD) cooling blower blade of reduction root bending stress according to claim 1, is characterized in that: described movable vane is radiation hardness stainless steel.
3. the control rod drive mechanisms (CRD) cooling blower blade of reduction root bending stress according to claim 1, is characterized in that: the corresponding air duct position of blade tip of described movable vane is provided with anti-surge ring, is provided with plural guide plate in described anti-surge ring.
4. the control rod drive mechanisms (CRD) cooling blower blade of reduction root bending stress according to claim 1, is characterized in that: described stator is wing blade.
5. the control rod drive mechanisms (CRD) cooling blower blade of reduction root bending stress according to claim 1, is characterized in that: diffusion tail cone is also equipped with in described interior casing upper end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410052878.XA CN103758783B (en) | 2014-02-17 | 2014-02-17 | A kind of control rod drive mechanisms (CRD) cooling blower blade reducing root bending stress |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410052878.XA CN103758783B (en) | 2014-02-17 | 2014-02-17 | A kind of control rod drive mechanisms (CRD) cooling blower blade reducing root bending stress |
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| Publication Number | Publication Date |
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| CN103758783A CN103758783A (en) | 2014-04-30 |
| CN103758783B true CN103758783B (en) | 2016-04-27 |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3189260A (en) * | 1963-03-08 | 1965-06-15 | Do G Procktno K I Exi Kompleks | Axial blower |
| SU1366709A1 (en) * | 1986-03-05 | 1988-01-15 | МВТУ им.Н.Э.Баумана | Turbomolecular vacuum pump |
| CN2603867Y (en) * | 2003-02-28 | 2004-02-18 | 张惠忠 | Axial-flow ventilating fan with sweeping slant blades and disrotatory pattern shafts |
| CN101418775B (en) * | 2007-10-24 | 2011-05-18 | 中国科学院工程热物理研究所 | Horizontal axle windmill and method for making wind-powered unit vane |
| FR2943103B1 (en) * | 2009-03-13 | 2011-05-27 | Turbomeca | AXIALO-CENTRIFUGAL COMPRESSOR WITH AN EVOLVING RAKE ANGLE |
| CN201368039Y (en) * | 2009-03-16 | 2009-12-23 | 江苏中联风能机械有限公司 | Efficient anti-surging axial flow fan |
| CN202926722U (en) * | 2012-11-08 | 2013-05-08 | 浙江金盾风机股份有限公司 | Nuclear-grade control rod drive mechanism blower motor housing structure with cooling function |
| CN203702654U (en) * | 2014-02-17 | 2014-07-09 | 南通大通宝富风机有限公司 | Control rod drive mechanism cooling fan blade capable of reducing bending stress of roots |
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