CN203702665U - Improved cooling fan of control bar driving mechanism - Google Patents
Improved cooling fan of control bar driving mechanism Download PDFInfo
- Publication number
- CN203702665U CN203702665U CN201420067884.8U CN201420067884U CN203702665U CN 203702665 U CN203702665 U CN 203702665U CN 201420067884 U CN201420067884 U CN 201420067884U CN 203702665 U CN203702665 U CN 203702665U
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- Prior art keywords
- exhaust outlet
- air duct
- crd
- control rod
- drive mechanisms
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- 230000007246 mechanism Effects 0.000 title claims abstract description 28
- 238000001816 cooling Methods 0.000 title claims abstract description 27
- 238000009792 diffusion process Methods 0.000 claims abstract description 20
- 238000004088 simulation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 241000826860 Trapezium Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The utility model discloses an improved cooling fan of a control bar driving mechanism. The improved cooling fan comprises a support, a fan body, an air outlet conical pipe and an air valve, wherein the fan body comprises an air duct, an air inlet is formed in the lower end of the air duct, a movable vane, a wheel hub, a guide vane, an inner casing and a driving fan are arranged in the air duct in sequence, the driving fan is arranged in the inner casing, the air duct comprises an inverted conical lower portion and a cylindrical upper portion, the guide vane is arranged at the connection position of the upper portion and the lower portion, and the unilateral angle of flare of the upper portion ranges from 5 degrees to 20 degrees. The section of the air outlet conical pipe is a trapezoid, the unilateral angle of flare of the air outlet conical pipe is identical to that of the upper portion, and the inner diameter of an air outlet in the upper end of the air outlet conical pipe ranges from 1150mm to 1350mm. The improved cooling fan of the control bar driving mechanism is simple and novel in structure, pressure loss of the fan during diffusion can be reduced, pressure overmeasure is increased, and safe reliability of the fan is improved.
Description
Technical field
The utility model relates to a kind of cooling blower, is specifically related to a kind of modified model control rod drive mechanisms (CRD) cooling blower.
Background technique
Control rod drive mechanisms (CRD) cooling blower is a kind of for the integrated heap top component of generation Ⅲ nuclear power unit control rod drive mechanisms (CRD) ventilation cooling system, its effect is to force cooling-air for control rod drive mechanisms (CRD) provides, to maintain the required temperature of the normal work of control rod drive mechanisms (CRD) coil block, and be no more than limit value, the performance of this blower fan directly affects the safety and reliability of reactor driving mechanism.
Control rod drive mechanisms (CRD) cooling blower is vertical axial-flow fan, requirement pressure is high, size is little, and need there is higher pressure allowance, to improve full reliability, therefore all there is big hub than the structure characteristic of (ratio of hub diameter and impeller diameter), current known engineering reactor top axial fan hub ratio is generally 0.7 left and right, and therefore control rod drive mechanisms (CRD) cooling blower has the aerodynamic characteristics of high exhaust velocity, high dynamic pressure.
There are the following problems for existing control rod drive mechanisms (CRD) cooling blower:
Blower fan free exhaust speed and kinetic energy are excessive, make fan operation Efficiency Decreasing, existing control rod drive mechanisms (CRD) cooling blower exhaust outlet Taper Pipe outlet and air-valve vent area are less, therefore exhaust velocity and kinetic energy are larger, this part kinetic energy can not be used for overcoming control rod drive mechanisms (CRD) cooling drag, is kind of a loss for blower fan itself.Through numerical simulation, existing control rod drive mechanisms (CRD) cooling blower exhaust outlet carries out numerical simulation, under design discharge, conventional blower fan annular exhaust outlet speed kinetic energy reaches 418Pa, accounts for 49% of blower fan apparatus requirement total head, illustrates that the fan outlet free exhaust pressure loss is larger;
Exhaust outlet Taper Pipe diffusion loss is larger, reduce fan operation efficiency, existing external import pile against the wind machine under design discharge blower fan body annular exit exhaust velocity conventionally in 45m/s left and right, its kinetic energy is greater than 1200Pa, enter at a high speed Taper Pipe, flow area sudden expansion increases, and has very maelstrom after annular exhaust outlet.Through numerical simulation, diffusion loss is greater than 300Pa, has therefore reduced fan operation efficiency.
In addition, control rod drive mechanisms (CRD) cooling blower requires to have sufficiently high pressure allowance under design angle, with away from blower fan surge area and irregular operation district, due to the larger sudden expansion pressure loss of annular exhaust outlet, the effective pressure that blower fan can provide to system is reduced, the highest can also corresponding reduction of operating pressure, thereby operating pressure allowance reduces, safety reliability declines.
Model utility content
Model utility object: in order to solve the deficiencies in the prior art, the utility model provides one can reduce the pressure loss in blower fan diffusion process, improves pressure allowance, thereby improves the modified model control rod drive mechanisms (CRD) cooling blower of safety reliability.
The purpose of this utility model is to realize by such technological scheme, a kind of modified model control rod drive mechanisms (CRD) cooling blower, comprise bearing, blower fan body, exhaust outlet Taper Pipe and air-valve, wherein said blower 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 air duct comprises bottom and top, described stator is located at the jointing place of described top and described bottom, described bottom is cylindrical, described top is inverted cone, and the monolateral angle of flare on described top is 5 ~ 20 °, described exhaust outlet Taper Pipe cross section is trapezoidal, and monolateral angle of flare is identical with the monolateral angle of flare on described top, the exhaust outlet internal diameter of described exhaust outlet Taper Pipe upper end is 1150 ~ 1350mm.
The monolateral angle of flare on described top is 15 °.
Described exhaust outlet Taper Pipe upper end exhaust outlet internal diameter is 1250mm.
The corresponding air duct of the blade tip position 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, a kind of modified model control rod drive mechanisms (CRD) cooling blower that the utility model discloses, it is cylindrical that airduct is set before stator, after stator, be the taper with certain angle of flare (existing heap against the wind machine air duct is overall cylindrical), be connected with air outlet Taper Pipe in air duct air outlet, air duct taper part has certain angle of flare with diffusion Taper Pipe thereafter, by taper air duct, exhaust outlet Taper Pipe, the acting in conjunction of diffusion tail cone, reduce by a relatively large margin the eddy resistance in diffusion process, by increasing exhaust outlet Taper Pipe air outlet vent area, free exhaust speed and kinetic energy are reduced, reduce relief opening loss, both combinations reduce internal vortex loss and the exhaust kinetic energy rejection in blower fan diffusion process, blower fan is improved to pressure that system provides, having improved that blower fan is the highest can operating pressure, thereby improve fan operation pressure allowance, safety reliability is improved.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the partial enlarged drawing of Fig. 1.
Embodiment
Below in conjunction with accompanying drawing of the present utility model, the utility model embodiment's technological scheme is carried out to clear, complete description.
As shown in Figure 1, a kind of modified model control rod drive mechanisms (CRD) cooling blower that the utility model discloses, it is vertical exhaust structure straight up, specifically comprise blower fan body, described blower fan body is fixed on basis by vibration damping holder 0, described blower 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 to described exhaust outlet Taper Pipe 10 exhausts with described interior casing 7, diffusion tail cone 9 is equipped with in described interior casing 7 upper ends, described drive motor 8 is built in described interior casing 7, described diffusion tail cone 9 is coated on described drive motor 8 outsides, described diffusion tail cone 9 cross sections are 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 comprises top 101 and bottom 102, described stator is located at the jointing place of described top 101 and bottom 102, described bottom 102 is cylindrical structural, described top 101 is cone structure, and monolateral angle of flare β is 5 ~ 20 °, upper end on top 101 connects exhaust outlet Taper Pipe 10, the monolateral angle of flare of described exhaust outlet Taper Pipe 10 is identical with the monolateral angle of flare on described top 101, the Taper Pipe exhaust outlet internal diameter of described exhaust outlet Taper Pipe 10 is 1150 ~ 1350mm, when under the effect of gas at stator, enter the top 101 of air duct 1 with high axial velocity, gas enters top 101, the passage that diffusion tail cone 9 and diffusion Taper Pipe 10 form, because diffusion tail cone 10 increases along airflow direction radius, and top 101 and exhaust outlet Taper Pipe 10 are synchronizeed and are increased along airflow direction radius and circulation area, airspeed and air hydrodynamic are reduced gradually, static air pressure increases, thereby reduce diffusion loss, the Taper Pipe exhaust outlet internal diameter of described exhaust outlet Taper Pipe 10 increases simultaneously, Taper Pipe air-out area is increased, and then reduce Taper Pipe exhaust outlet kinetic energy.
Described air-valve 11 is arranged on the exhaust outlet of described exhaust outlet Taper Pipe 10, in the time that blower fan is out of service, has prevented that outer gas stream from pouring in down a chimney in blower fan, and its internal diameter size is identical with the exhaust outlet internal diameter of described exhaust outlet Taper Pipe.
As shown in Figure 2, the corresponding air duct of the blade tip front end position of described movable vane 4 is provided with anti-surge ring 12, described anti-surge ring 12 outsides are circular groove 13, in described circular groove 13, be along the circumferential direction evenly provided with plural guide plate 14, described guide plate 14 inner sides are provided with guide ring 15, described guide ring 15 internal diameters are identical with described air duct 1 bottom 102 internal diameters, in the time that system resistance increases, the movable vane 4 inlet air flow angles of attack increase, movable vane 4 suction surface air-flows are seriously separated, and form eddy current in movable vane 4 leading edges, 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 that guide plate 14 and guide ring 15 form, eddy current air mass is through separating, after rectification, turn back in main air flow, make further developing of eddy current suppressed, thereby eliminate surge area, no longer thermal agitation of movable vane 4 front and back air-flows simultaneously, avoid movable vane 4 to 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, improves fan performance, improves safety reliability.
A kind of modified model control rod drive mechanisms (CRD) cooling blower that the utility model discloses, 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 exhausts of the annular pass that forms through air duct 1 and interior casing 7, gas is discharged by exhaust outlet Taper Pipe 10.
Technology contents of the present utility model and technical characteristics have disclosed as above; but those of ordinary skill in the art still may do all replacement and modifications that does not deviate from the utility model spirit based on announcement of the present utility model; therefore; the utility model protection domain should be not limited to the content that embodiment discloses; and should comprise various do not deviate from replacement of the present utility model and modifications, and contained by present patent application claim.
Claims (6)
1. a modified model control rod drive mechanisms (CRD) cooling blower, comprise bearing, blower fan body, exhaust outlet Taper Pipe and air-valve, wherein said blower 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, it is characterized in that: described air duct comprises bottom and top, described stator is located at the jointing place of described top and described bottom, described bottom is cylindrical, described top is inverted cone, and the monolateral angle of flare on described top is 5 ~ 20 °, described exhaust outlet Taper Pipe cross section is trapezoidal, and monolateral angle of flare is identical with the monolateral angle of flare on described top, the exhaust outlet internal diameter of described exhaust outlet Taper Pipe upper end is 1150 ~ 1350mm.
2. modified model control rod drive mechanisms (CRD) cooling blower according to claim 1, is characterized in that: the monolateral angle of flare on described top is 15 °.
3. modified model control rod drive mechanisms (CRD) cooling blower according to claim 1, is characterized in that: described exhaust outlet Taper Pipe upper end exhaust outlet internal diameter is 1250mm.
4. modified model control rod drive mechanisms (CRD) cooling blower according to claim 1, is characterized in that: the corresponding air duct of the blade tip position of described movable vane is provided with anti-surge ring, is provided with plural guide plate in described anti-surge ring.
5. modified model control rod drive mechanisms (CRD) cooling blower according to claim 1, is characterized in that: described stator is wing blade.
6. modified model control rod drive mechanisms (CRD) cooling blower 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 |
|---|---|---|---|
| CN201420067884.8U CN203702665U (en) | 2014-02-17 | 2014-02-17 | Improved cooling fan of control bar driving mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420067884.8U CN203702665U (en) | 2014-02-17 | 2014-02-17 | Improved cooling fan of control bar driving mechanism |
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| Publication Number | Publication Date |
|---|---|
| CN203702665U true CN203702665U (en) | 2014-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420067884.8U Expired - Lifetime CN203702665U (en) | 2014-02-17 | 2014-02-17 | Improved cooling fan of control bar driving mechanism |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103821772A (en) * | 2014-02-17 | 2014-05-28 | 南通大通宝富风机有限公司 | Optimized control rod drive mechanism cooling fan |
-
2014
- 2014-02-17 CN CN201420067884.8U patent/CN203702665U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103821772A (en) * | 2014-02-17 | 2014-05-28 | 南通大通宝富风机有限公司 | Optimized control rod drive mechanism cooling fan |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140709 |