CN109083861A - Pump shaft location sealing structure under 300MW nuclear reactor coolant pump main pump - Google Patents
Pump shaft location sealing structure under 300MW nuclear reactor coolant pump main pump Download PDFInfo
- Publication number
- CN109083861A CN109083861A CN201810824285.9A CN201810824285A CN109083861A CN 109083861 A CN109083861 A CN 109083861A CN 201810824285 A CN201810824285 A CN 201810824285A CN 109083861 A CN109083861 A CN 109083861A
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- Prior art keywords
- pump
- pump shaft
- shaft
- main
- impeller
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/043—Shafts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/106—Shaft sealings especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/548—Specially adapted for liquid pumps
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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 relates to pump shaft location sealing structure under a kind of 300MW nuclear reactor coolant pump main pump unit, lower 1 shaft end of pump shaft has a spherical surface body 8, and spherical surface body 8 is in contact with the internal conical surface of its mating surface diffuser 6, forms a circle annular sealing surface.When the present invention assembles, is fallen on the circular conical surface in diffuser 6 by the self weight of lower pump shaft 1, play the role of self-centering.Meanwhile in the sealing of main spindle overhauling three-level, the spherical surface and internal conical surface can prevent band nuclear cooling agent upward reflux out of pump case 7 in pump case 7 from coming out, and play buffer action.Lower pump shaft location sealing structure, obtains some technical data through derivation operation, provides reliable theoretical foundation for lower pump shaft Theoretical Design and shafting installation.
Description
Technical field
The present invention relates to pump shaft location sealing structures under a kind of 300MW nuclear reactor coolant pump main pump unit.
Background technique
Under the reactor coolant pump that 300MW PWR nuclear power plant uses pump shaft as shafting transmission shaft key component it
One, position is in the lower part at core main pump center, is to ensure that the important component of the initial installation center of main pump, is reactor coolant pump knot
The important component of core the most in structure.The axial end design of lower pump shaft is one of feature important in coolant pump design,
It is that lower pump shaft structure designs indispensable link.The technical data obtained by operation, it is important for the design accumulation of core main pump
Theoretical foundation.Currently, core main pump is the equipment for uniquely not fully achieving production domesticization in China's nuclear island of nuclear power station, it is technical
Advanced to be monopolized for a long time by developed countries such as America and Europes, China is in passive state in the design and manufacture view of core main pump, thus
The design of core Structure of RCP and theoretical research are particularly important.
Summary of the invention:
The object of the present invention is to provide a kind of safety, good airproof performance, 300MW nuclear reactor coolant pump core master with high accuracy
Pump lower pump shaft location sealing structure.The technical scheme is that being pumped under a kind of 300MW reactor coolant pump core main pump unit
Axis location sealing structure, its transmission shaft of core Structure of RCP are formed by three sections, and for main thrust disk on upper pump shaft 14, upper pump shaft 14 is solid
It is scheduled on half-coupling 13 and connect composition shafting upper portion with the first flat key 17,9 sets of axle sleeve in lower 1 lower part of pump shaft, main shaft
Three-level sealing 10 is mounted on 9 top of axle sleeve, 9 sets of axle sleeve in lower 1 lower part of pump shaft, impeller 3 is located at lower 1 lower part of pump shaft, lower 1 axis of pump shaft
There is dowel pilotage 2 at end with 3 upper surface of impeller, and impeller bolt 5, impeller nut 4 link together lower pump shaft 1 with impeller 3, lower half connection
Joint 11 is mounted on 10 upper surface of main shaft seal, and lower half-coupling 11 forms shafting lower section portion with lower pump shaft 1, impeller 3, axle sleeve 9
Point, jackshaft 12 and upper half-coupling 13, lower half-coupling 11 are connected and fixed using bolt 15, straight pin 16 and constitute main pump unit
Shafting part, shafting is partially contained in inside diffuser 6.
The shaft end of lower pump shaft 1 is equipped with 8 structure of spherical, spherical 8 and lower 1 shaft end spherical cooperation position of pump shaft
Diffuser 6 is designed to circular conical surface.
The operation principle of the present invention is that:
According to geometrical principle, lower pump shaft 1 and diffuser 6 are symmetrical structure, using spherical several not isometrical circles with
The conical surface of several linear not isometrical circle compositions, which is in contact, has a characteristics of equal diameter circle matches, by lower pump
The shaft end of axis 1 is designed to that spherical surface 8 matches to form a circle annular surface with the internal conical surface of diffuser 6, reach self-centering and
The structural requirement of sealing.
According to structural requirement, the radius distance value of the shaft end spherical surface body 8 of lower pump shaft 1 is determined using plan Drawing method, is led to simultaneously
It crosses derivation operation and show that numerical value is identical as the radius distance value of shaft end spherical surface body 8, it is correct to verify its design size；According to lower pump shaft
1 just fills and runs the data that different conditions status requirement calculates, and checks to the measurement of main pump actual installation and provides strong theoretical value
According to.
Lower pump shaft 1 is located at lower part in coolant pump, and the lower end surface of lower pump shaft 1 is tightly connected with 3 end face of impeller, leans on impeller spiral shell
The components such as bolt 5, impeller nut 4 are securely fixed together, and lower pump shaft 1 has therebetween dowel pilotage 2 fixed with impeller 3, are risen
To positioning action, and nationality is with by motor power torque transfer to impeller 3.
Technological merit of the invention is:
1. spherical radius R=219.317mm, as shown in Figure 2.8 position of spherical surface in lower 1 structure of pump shaft is the design of core main pump
One of middle important feature is that lower pump shaft designs indispensable link；
2. when main pump is installed for the first time, lower pump shaft 1 and the main shaft three-level being mounted on lower pump shaft 1 sealing 10, axle sleeve 9 and under
Half-coupling 11 is assembled into the lower half portion of main pump shafting, by the shaft end spherical surface 8 and fixing piece diffuser 6 of lower pump shaft 1
Conical surface contact forms self-centering structure.The components such as the other two parts jackshafts 12 of shafting and upper pump shaft 14, with this center work
For the installation foundation center of core main pump, the rotating part for collectively constituting shafting is coupled with lower 1 component of pump shaft.Main pump global facility dress
With strictly using installation center as original base point, when main pump is installed up and down whether with one heart, the safe operation and vibration of main pump decide
It is dynamic；
3. when main pump maintenance, lower 1 component of pump shaft falls, the spherical surface 8 and the circle in diffuser 6 of lower 1 shaft end of pump shaft
Taper-face contact forms an annular circumferential sealing surface, and by means of pump shaft system own wt, seals up primary Ioops band in pump case 7
Nuclear cooling medium not up reflux, plays the role of seal isolation；
4. core main pump shafting is assembled, jackshaft 12 and upper pump shaft 14 grade components first link into an integrated entity, this pump shaft 1 etc. at present
Component is fallen into diffuser, is accumulated between numerical compensation between the components such as jackshaft 12 and lower pump shaft 1 shafting build-up member
Error and Theoretical Design gap numerical value, i.e. spherical surface 8 and 6 inner conical surface vertical height EG=4.8387mm of diffuser, as shown in Fig. 2,
And assemble whether reach installation requirement between shaft components, gap numerical value EG provide most important theories when core main pump integrally assembles according to
According to；
5. the arc action value DE=0.114mm being calculated is to process lower 1 shaft end spherical surface of pump shaft and detect its spherical surface height
Foundation.
Detailed description of the invention:
Fig. 1 core main pump shafting structure figure
Pump shaft 1 and 6 Fit dimension chain relation schematic diagram of diffuser under Fig. 2
Specific embodiment
As shown in Figure 1, pump shaft location sealing structure under a kind of 300MW reactor coolant pump core main pump unit, core main pump
Its transmission shaft of structure is formed by three sections, main thrust disk on the upper pump shaft 14, upper pump shaft 14 be fixed on half-coupling 13 with
First flat key 17 connection composition shafting upper portion, 9 sets of axle sleeve are mounted on axle sleeve 9 in lower 1 lower part of pump shaft, main shaft three-level sealing 10
Top, 9 sets of axle sleeve in lower 1 lower part of pump shaft, impeller 3 is located at lower 1 lower part of pump shaft, and there are joint close in lower 1 shaft end of pump shaft and 3 upper surface of impeller
Pin 2, impeller bolt 5, impeller nut 4 link together lower pump shaft 1 with impeller 3, and lower half-coupling 11 is mounted on main shaft seal
10 upper surfaces, lower half-coupling 11 form shafting the lower section, jackshaft 12 and upper half shaft coupling with lower pump shaft 1, impeller 3, axle sleeve 9
Section 13, lower half-coupling 11 are connected and fixed the shafting part for constituting main pump unit, shafting part dress using bolt 15, straight pin 16
Inside diffuser 6.
The shaft end of lower pump shaft 1 is equipped with 8 structure of spherical, spherical 8 and lower 1 shaft end spherical cooperation position of pump shaft
Diffuser 6 is designed to circular conical surface.
In order to realize this requirement, at the shaft end position of lower pump shaft 1, it is designed to spherical surface body 8.Lower 1 component of pump shaft relies on certainly
It flumps on the circular conical surface in diffuser 6, plays the role of self-centering.When repairing the sealing of main shaft three-level, 8 He of spherical surface
The sealing surface that internal conical surface pair is formed prevents nuclear cooling medium from coming in reflux out of pump case 7, plays the role of isolating seal.Core main pump
The axial end design of lower pump shaft 1 is that lower pump shaft structure designs indispensable link.And relevant calculation demonstration is able to verify that and sets
The reasonable and correctness of meter, it is ensured that the design of core main pump is complete, safe and reliable to operation.
Following 1 spherical surface body of lower pump shaft, 8 structure sizes calculate and the relationship of 8 numerical value of spherical surface body and 6 inside dimension chain of diffuser:
1 diameter of pump shaft under as shown in Figure 2: d1=φ 320mm d2=φ 300mm d3=φ 310mm
6 lower inner diameter of diffuser: D1=φ 326mm D2=φ 305mm
The interior cone angle of 6 inner conical surface of diffuser: β=45 °
Lower 1 spherical surface perpendicular bisector of pump shaft and centerlines: α=45 °
One, the related size of Drawing Design:
1. the determination of the 8 radius SR of spherical surface body of ball face sealing:
Mapping foundation: the center line of sphere-contact point must be in a vertical angle with 6 inner conical surface of diffuser.Radius can be different
Numerical value, therefore numerous point can be made, but only one point be it is rationally desirable, that is, descend the spherical radius on pump shaft 1
SR=219.317mm is in contact with 8 internal conical surface of diffuser, is formed by annular sealing surface 8 and is only emphasis described herein as.Choosing
Select lower pump shaft 1 be in contact with diffuser 6 Best Point mapping sequence: by lower 1 shaft end b point of pump shaft make 135 ° of straight lines meet at diameter
d1On c point, remake vertical two bisector of cb line, intersect at O point with the center line of lower pump shaft 1, make bec using Ob line as radius
Circular arc can obtain spherical surface camber line and spherical radius SR=219.317mm.
2. measuring lower 1 spherical surface of pump shaft, Drawing Design spherical surface 8 in order to ensure the processing quality of spherical radius SR convenient for checking
Highest point e on radius, the numerical value ed=0.114mm. relative to c, b point
3. according to lower pump shaft 1 and 6 fit dimension chain relation of diffuser, mapping can obtain eg=4.84mm.
Two, the correctness of above-mentioned design mapping data is verified below:
1. SR value calculates:
SR=[(d1/2)2+(d2/2)2]1/2=[(320/2)2+(300/2)2]1/2=219.317mm.
That is Oc=Ob=Oe=219.317mm (lower 1 spherical radius SR of pump shaft)
2. eg value calculates:
Oa=(d1/ 2)/sin45 °=(320/2) × 21/2=226.27417mm.
Ah=Sin45 ° × Oa-d3/ 2=Sin45 ° × 226.27417-155=5mm.
Af=Cos45 ° × ah=Cos45 ° × 5=3.5355mm.
Ef=Oa- (af+Oe)=226.27417- (3.5355+219.317)=3.42167mm.
Eg=ef/cos45 °=3.42167 × 21/2=4.84mm.
Eg numbers illustrated, when pump shaft 1 falls instantly, the shaft end global maximum and 6 inner cone face contact of diffuser of lower pump shaft 1
Vertical range is 4.84mm, which checks and accepts for detection when assembly shafting.
3. ed value calculates:
Ad=Cos45 ° × (ab/2)=Cos45 ° × (10/2)=7.071mm
Od=Oa-ad=226.274-7.071=219.203mm.
Ed=Oe-Od=219.317-219.203=0.114mm.
Spherical arc dimensional gaughing beasurement base after the numerical value is processed as lower pump shaft 1.
The content of present invention is that core main pump autonomous Design accumulates important technical data, increases data reserve.
Claims (2)
1. pump shaft location sealing structure under a kind of 300MW reactor coolant pump core main pump unit, it is characterized in that: core Structure of RCP
Its transmission shaft is formed by three sections, and on upper pump shaft (14), upper pump shaft (14) is fixed on half-coupling (13) main thrust disk
Composition shafting upper portion is connect with the first flat key (17), axle sleeve (9) is covered in lower pump shaft (1) lower part, and main shaft three-level seals (10)
It is mounted on axle sleeve (9) top, axle sleeve (9) is covered in lower pump shaft (1) lower part, and impeller (3) is located at lower pump shaft (1) lower part, lower pump shaft (1)
Shaft end and impeller (3) upper surface have dowel pilotage (2), and impeller bolt (5), impeller nut (4) connect lower pump shaft (1) and impeller (3)
It is connected together, lower half-coupling (11) is mounted on main shaft seal (10) upper surface, lower half-coupling (11) and lower pump shaft (1), leaf
(3), axle sleeve (9) composition shafting the lower section are taken turns, jackshaft (12) and upper half-coupling (13), lower half-coupling (11) use spiral shell
Bolt (15), straight pin (16) are connected and fixed the shafting part for constituting main pump unit, and it is internal that shafting is partially contained in diffuser (6).
2. pump shaft location sealing structure under a kind of 300MW reactor coolant pump core main pump unit according to claim 1,
It is characterized in that: the shaft end of lower pump shaft (1) is equipped with spherical (8) structure, spherical (8) and lower pump shaft (1) shaft end spherical
The diffuser (6) of cooperation position is designed to circular conical surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810824285.9A CN109083861A (en) | 2018-07-25 | 2018-07-25 | Pump shaft location sealing structure under 300MW nuclear reactor coolant pump main pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810824285.9A CN109083861A (en) | 2018-07-25 | 2018-07-25 | Pump shaft location sealing structure under 300MW nuclear reactor coolant pump main pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109083861A true CN109083861A (en) | 2018-12-25 |
Family
ID=64838512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810824285.9A Pending CN109083861A (en) | 2018-07-25 | 2018-07-25 | Pump shaft location sealing structure under 300MW nuclear reactor coolant pump main pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109083861A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1365401A (en) * | 1971-06-29 | 1974-09-04 | Andritz Ag Maschf | Hot water pump with a cooled shaft seal housing |
| CN102777423A (en) * | 2012-08-27 | 2012-11-14 | 哈尔滨电气动力装备有限公司 | Hydraulic part of 300MW reactor coolant pump |
| CN203892228U (en) * | 2014-04-04 | 2014-10-22 | 哈尔滨电气动力装备有限公司 | Bearing guide ring structure of main pump assembly of 300MW nuclear reactor coolant pump |
| CN204239317U (en) * | 2014-11-14 | 2015-04-01 | 哈尔滨电气动力装备有限公司 | Pump shaft location sealing structure under 300MW nuclear reactor coolant pump main pump unit |
| CN207406529U (en) * | 2017-10-25 | 2018-05-25 | 福建福清核电有限公司 | A kind of main pump bearing chamber lubrication oil circulation circuit |
-
2018
- 2018-07-25 CN CN201810824285.9A patent/CN109083861A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1365401A (en) * | 1971-06-29 | 1974-09-04 | Andritz Ag Maschf | Hot water pump with a cooled shaft seal housing |
| CN102777423A (en) * | 2012-08-27 | 2012-11-14 | 哈尔滨电气动力装备有限公司 | Hydraulic part of 300MW reactor coolant pump |
| CN203892228U (en) * | 2014-04-04 | 2014-10-22 | 哈尔滨电气动力装备有限公司 | Bearing guide ring structure of main pump assembly of 300MW nuclear reactor coolant pump |
| CN204239317U (en) * | 2014-11-14 | 2015-04-01 | 哈尔滨电气动力装备有限公司 | Pump shaft location sealing structure under 300MW nuclear reactor coolant pump main pump unit |
| CN207406529U (en) * | 2017-10-25 | 2018-05-25 | 福建福清核电有限公司 | A kind of main pump bearing chamber lubrication oil circulation circuit |
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Application publication date: 20181225 |
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