CN-122014632-A - Shielding motor nuclear main pump hydraulic model and shielding motor nuclear main pump

CN122014632ACN 122014632 ACN122014632 ACN 122014632ACN-122014632-A

Abstract

The application relates to the technical field of vane pumps, and provides a hydraulic model of a nuclear main pump of a shielding motor and the nuclear main pump of the shielding motor. The hydraulic model of the nuclear main pump of the shielding motor comprises an impeller, a guide vane, a pump shell and a guide vane, wherein the blades of the impeller are three-dimensional structural blades with linear elements, the guide vane is matched with the impeller, the blades of the guide vane are three-dimensional structural blades with linear elements, the shape of the three-dimensional structural blades with the linear elements is determined through two groups of curve elements positioned on a front cover plate and a rear cover plate, the curve elements comprise a front edge line, a tail edge line, a pressure surface line and a suction surface line, and the three-dimensional structural blades with the linear elements generate the front edge line, the tail edge line, the pressure surface line and the suction surface line of the front cover plate and the rear cover plate based on parameterized meridian curves, camber lines and camber lines, sweep or grid methods. The linear element three-dimensional structure blade can be integrally milled, so that the material utilization rate, the processing efficiency and the processing quality are improved, and the casting defect is overcome.

Inventors

ME LIXIN
ZHANG XINTAI
ZHANG YANG
PEI LIN
TAO ZHANCHUN

Assignees

沈鼓集团股份有限公司
沈阳透平机械股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260209

Claims (10)

1. A canned motor nuclear main pump hydraulic model, characterized by comprising: the impeller is used for being sleeved on a rotating shaft of the nuclear main pump of the shielding motor, and blades of the impeller are three-dimensional structure blades of line elements; The guide vane is matched with the impeller, and the blades of the guide vane are linear element three-dimensional structure blades; a pump housing cooperating with the guide vane; The three-dimensional structural blade with the line elements is characterized in that the appearance of the three-dimensional structural blade with the line elements is determined through two groups of curve elements positioned on a front cover plate and a rear cover plate, the curve elements comprise a front edge line, a tail edge line, a pressure surface line and a suction surface line, the curve elements are described through meridian curves, mean camber line angle distribution and thickness distribution, and the three-dimensional structural blade with the line elements generates the front edge line, the tail edge line, the pressure surface line and the suction surface line of the front cover plate and the rear cover plate based on the parameterized meridian curves, the mean camber line angle distribution and the thickness distribution, and a continuous curved surface is constructed through a lofting, sweeping or grid method.
2. The nuclear main pump hydraulic model of a canned motor according to claim 1, wherein the impeller comprises impeller blades, an impeller front cover plate and an impeller rear cover plate, the impeller front cover plate and the impeller rear cover plate are positioned at two sides of the impeller blades, and the impeller blades comprise four blades which are arranged at intervals along the circumferential direction of the rotating shaft.
3. The nuclear main pump hydraulic model of a shielding motor according to claim 2, wherein a back cover plate side vane type wrap angle alpha and a front cover plate side vane type wrap angle beta of the vane of each impeller satisfy the following relation that alpha-beta is more than or equal to 28 degrees and less than or equal to 30 degrees; And alpha is an included angle between the front edge point and the tail edge point of the molded line at the rear cover plate and the projection of the axis of the impeller, and beta is an included angle between the front edge point and the tail edge point of the molded line at the front cover plate and the projection of the axis of the impeller.
4. The canned motor nuclear main pump hydraulic model of claim 1, wherein the impeller is a mixed flow wheel.
5. The nuclear main pump hydraulic model of a canned motor according to claim 1, wherein the guide vane comprises a guide vane blade, a guide vane front cover plate and a guide vane rear cover plate, the guide vane front cover plate and the guide vane rear cover plate are positioned at two sides of the guide vane blade, the guide vane blade comprises N blades which are arranged at intervals along the circumferential direction of the rotating shaft, wherein N is more than or equal to 7 and less than or equal to 11, and N is a positive integer.
6. The nuclear main pump hydraulic model of a canned motor according to claim 5, wherein the outlet blade angle of the guide vane comprises a guide vane front cover plate outlet angle A and a guide vane rear cover plate outlet angle B, and the following relation is satisfied, that is, 44 degrees less than or equal to A less than or equal to 46 degrees, and 44 degrees less than or equal to B less than or equal to 46 degrees.
7. The nuclear main pump hydraulic model of a shielding motor according to claim 5, wherein the guide vane outlet inclination angle gamma satisfies the following relation that gamma is less than or equal to-14 degrees and less than or equal to +9 degrees; the guide vane outlet inclination angle gamma is an included angle between a connecting line of the tail edge centers of the guide vane front cover plate and the guide vane rear cover plate and a straight line which passes through the tail edge center of the guide vane rear cover plate and is parallel to the axis of the rotating shaft.
8. The nuclear main pump hydraulic model of a shielding motor according to claim 5, wherein the difference between the wrap angle D of the rear cover plate of the guide vane and the wrap angle C of the front cover plate of the guide vane satisfies the following relation that D-C is larger than or equal to 9 degrees and smaller than or equal to 11 degrees.
9. The canned motor nuclear main pump hydraulic model of claim 1, wherein the pump housing comprises a spherical body and a water outlet barrel protruding from the outer surface of the spherical body, and the spherical body and the water outlet barrel are connected by adopting a tapered structure from approximately rectangular to circular.
10. A canned motor nuclear main pump, characterized by comprising: the canned motor nuclear main pump hydraulic model of any one of claims 1 to 9.

Description

Shielding motor nuclear main pump hydraulic model and shielding motor nuclear main pump Technical Field The application relates to the technical field of vane pumps, in particular to a hydraulic model of a nuclear main pump of a shielding motor and the nuclear main pump of the shielding motor. Background The large advanced pressurized water reactor nuclear power station is mainly specially designed for pressurized water reactor, and aims to form a large advanced pressurized water reactor nuclear power technology brand with independent intellectual property and larger power through innovation and development on the basis of digestion, absorption and comprehensive mastering of the advanced technology of the introduced third-generation nuclear power AP 1000. In the current technical field, a nuclear main pump hydraulic model which is different from an AP1000 technology is not generated, and after the power is increased from 100 kilowatts to 140 kilowatts, the nuclear main pump hydraulic model has a high-efficiency nuclear main pump hydraulic model with independent intellectual property rights. The model has the multi-constraint conditions that the flow rate is increased by 21% compared with the AP1000, the lift is basically kept unchanged, the hydraulic efficiency is improved by 1.2%, the necessary cavitation allowance is reduced by 32.6%, the rotating speed is reduced by 17%, the outer diameter limiting size is increased by 7.3%, the inlet pipe diameter of the pump shell is increased by 8.0%, the outlet pipe diameter is increased by 16.3%, and the axial force is smaller than 23 tons. The existing impeller has a plurality of problems, such as a large number of blades, a large number of casting defects caused by adopting a casting processing mode, and the like. In particular, in the area with larger alternating stress change of the front edge of the blade, even if the casting defect is repaired, the fatigue damage of the blade is extremely easy to be caused, so that the unit is in fault and stop accident, and the design requirement of the service life of the main pump for 60 years cannot be met. In addition, the point element three-dimensional blade with the existing structure also has the problems of high processing difficulty and high processing cost, and can not be completed by an integral numerical control processing method. Disclosure of Invention In order to solve the technical problems that the processing difficulty of the three-dimensional blade of the nuclear main pump hydraulic model point element is high, and casting defects are more due to the adoption of a casting processing mode, the application provides a shielding motor nuclear main pump hydraulic model. The second aspect of the application provides a nuclear main pump of a canned motor. In view of the above, the first aspect of the application provides a hydraulic model of a nuclear main pump of a shielding motor, which comprises an impeller, a guide vane, a pump shell and a guide vane, wherein the impeller is used for being sleeved on a rotating shaft of the nuclear main pump of the shielding motor, the blade of the impeller is a line element three-dimensional structure blade, the guide vane is matched with the impeller, the blade of the guide vane is a line element three-dimensional structure blade, the pump shell is matched with the guide vane, the appearance of the line element three-dimensional structure blade is determined through two groups of curve elements positioned on a front cover plate and a rear cover plate, the curve elements comprise a front edge line, a tail edge line, a pressure facial line and a suction facial line, the curve elements are described through meridian curves, mean camber line angle distributions and thickness distributions, and the line element three-dimensional structure blade generates a front edge line, a tail edge line, a pressure facial line and a suction facial line of the front cover plate based on parameterized meridian curves, the mean camber line angle distributions and the thickness distributions, and the continuous curved surfaces are constructed through lofting, sweeping or grid methods. With reference to the first aspect, in some realizable modes, the impeller comprises impeller blades, an impeller front cover plate and an impeller rear cover plate, wherein the impeller front cover plate and the impeller rear cover plate are positioned on two sides of the impeller blades, and the impeller blades comprise four blades which are arranged at intervals along the circumferential direction of the rotating shaft. In combination with the first aspect, in some realizable modes, the back cover plate side blade wrap angle alpha and the front cover plate side blade wrap angle beta of the blades of each impeller meet the following relational expression that alpha-beta is more than or equal to 28 degrees and less than or equal to 30 degrees, wherein alpha is an included angle between a molded line front edge poin