CN106567859A

CN106567859A - Nuclear main pump spherical pumping chamber

Info

Publication number: CN106567859A
Application number: CN201610970196.6A
Authority: CN
Inventors: 张永超; 杨敏官; 高波; 倪丹
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2016-11-04
Filing date: 2016-11-04
Publication date: 2017-04-19
Anticipated expiration: 2036-11-04
Also published as: CN106567859B

Abstract

The invention relates to a nuclear main pump spherical pumping chamber, in particular to a nuclear main pump spherical pumping chamber with a pumping chamber guide, and belongs to the field of fluid machinery. The flow mixing type nuclear main pump spherical pumping chamber with the pumping chamber guide is proposed in order to control a backflow structure at the tail of a diffuser of the flow mixing type nuclear main pump spherical pumping chamber with the pumping chamber guide. Two flow guide vanes are added near the tail of a liquid outlet pipe of a spherical shell and on a rear cover plate of the spherical shell, and the pumping chamber guide is formed. The backflow structure of the tail of the liquid outlet pipe of the shell is improved, and distribution of the inner flow field of the shell is controlled. The change of the shell structure is simple and reasonable and easy to implement in machining and operation, hydraulic loss inside the shell is effectively lowered, and the performance of a nuclear main pump is further improved.

Description

The spherical pumping chamber of one seed nucleus main pump

Technical field

The present invention relates to the spherical pumping chamber of a seed nucleus main pump, refers in particular to a kind of core main pump ball with pumping chamber guider Type pumping chamber, belongs to field of fluid machinery.

Background technology

Nuclear reactor primary coolant pump, also known as core main pump, is unique high-speed rotating machine in nuclear island, is reactor Heart.Because of its rigorous service condition, and its long-term continuous failure-free operation is required, therefore the safety and reliability of core main pump will Significantly larger than common mixed-flow pump, has very big difference with common mixed-flow pump with design so as to cause its structure.Especially for guarantor The intensity of card pump case and the spherical shell that adopts, its internal flow situation complex cause its efficiency ratio commonly to adopt spiral The efficiency of the water pump of shape spiral case is low.

Research for core main pump in recent years focuses primarily upon the change of impeller and stator design parameter to hydraulic performance Impact, but it is actually rare on the research that hydraulic performance affects with regard to pumping chamber.Xu Shiming, Zhang Dongjun et al. are once to pump case pair Research was done in the impact of core main pump performance, and in core main pump, stator and spherical shell are the carriers of energy conversion, after grasping its matching The internal flow of flow behavior energy effective control is lost.Research shows, in housing anemostat afterbody, it may appear that one large range of Low-pressure area, so as to produce backflow at this position, causes enclosure interior flow losses.In order to realize that mixed-flow pump internal flow is had Effect control, to improve the efficiency and stability of energy transport and conversion between hydraulic part and fluid, therefore controls mixed flow pump case Interior bad fluidal texture is significant to the performance for improving pump.

The content of the invention

From the spherical pumping chamber anemostat afterbody return-flow structure of control mixed-flow core main pump, the present invention proposes that one kind has The spherical pumping chamber of mixed-flow core main pump of pumping chamber guider, near spherical shell drain pipe afterbody on spherical shell back shroud Two panels guide vane is increased, pumping chamber guider is constituted, is improved the return-flow structure of housing drain pipe afterbody, control in housing The distribution in portion flow field.Its shell structure changes relatively simple reasonable, easily implements, and effectively reduce shell on process operation Internal hydraulic loss, further improves the performance of core main pump.

The present invention proposes a kind of spherical pumping chamber of core main pump with pumping chamber guider.

The spherical pumping chamber that should have pumping chamber guider includes radial vane, spherical shell and pumping chamber guider, should Pumping chamber guider is located near spherical shell drain pipe, and just to the gate vane channel A of housing drain pipe after, by two panels water conservancy diversion Blade is constituted, and its guide vane is connected with back shroud, is axially aligned on the outside of the guide vane front end and stator back shroud.Water conservancy diversion leaf The inlet side of piece and the outlet side radially aligned of stator.

Advantage for present invention is：From the spherical pumping chamber anemostat afterbody return-flow structure of control core main pump, adopt The spherical pumping chamber of core main pump of apparatus pressure water room guider.Send out in drain pipe bottom gate vane channel A near exits for flowing Raw large scale is separated, the medium flowed out from gate vane channel A by guider guiding, so as to improve the fluidal texture at this position, Weaken the backflow phenomenon of position, control the distribution in enclosure interior flow field, reduce the hydraulic loss in pumping chamber, to reach The purpose of mixed-flow core main pump Effec-tive Function.In terms of processing, its simple operability is also the advantage which possesses.

Description of the drawings

Fig. 1 is traditional mixed-flow core main pump shaft schematic cross-section without pumping chamber guider.

Fig. 2 is traditional mixed-flow core main pump axial plane schematic diagram without pumping chamber guider.

Fig. 3 is the spherical pumping chamber shaft section schematic diagram of core main pump with pumping chamber guider.

Fig. 4 is the spherical pumping chamber axial plane schematic diagram of core main pump with pumping chamber guider.

1st, radial vane；2nd, spherical shell；3rd, pumping chamber guider；4th, impeller；5th, back shroud；6th, front shroud；

Specific embodiment

The invention will be further described below in conjunction with the accompanying drawings.

Fig. 1 and Fig. 2 give traditional mixed-flow core main pump shaft section without pumping chamber guider and central cross-section is illustrated Figure.There is figure to understand that traditional mixed-flow core main pump pumping chamber includes radial vane 1 and spherical shell 2.

Fig. 3 and Fig. 4 give the spherical pumping chamber of mixed-flow core main pump with pumping chamber guider proposed by the present invention Shaft section and central cross-section schematic diagram, as seen from the figure：Should with pumping chamber guider the spherical pumping chamber of mixed-flow core main pump by Radial vane 1, spherical shell 2 and pumping chamber guider 3 are constituted, and the pumping chamber guider 3 goes out liquid positioned at close spherical shell 2 Pipe nearby, and just to the gate vane channel a of spherical shell drain pipe after because gate vane channel a is located at drain pipe bottom, flowing exists There is large scale herein to separate, the medium part for passing out flows out spherical shell 2 from drain pipe, and another part is then spherical Circulate in housing 2.Guider main purpose in the present invention is to reduce the ratio of the medium circulated in spherical shell 2, To reduce flow losses in spherical shell 2.Pumping chamber guider 3 is made up of two panels guide vane, its guide vane and back shroud 5 It is connected, axially aligns on the outside of the guide vane front end and stator back shroud 5, the inlet side of guide vane and going out for radial vane 1 Mouth side radially aligned.

Using CFD numerical computations means to traditional core main pump and the core for matching the spherical pumping chamber with pumping chamber guider Main pump has carried out performance prediction contrast, (the Q/Q at the design point₀=1.0), using the spherical pumping chamber with pumping chamber guider Core main pump compare traditional core main pump, its lift is basically unchanged, efficiency increase by 0.75 percentage point.Therefore present invention improves pressure The fluidal texture of hydroecium drain pipe afterbody, reduces the flow losses inside pumping chamber, so as to further improve core main pump Performance.

Claims

1. the spherical pumping chamber of a seed nucleus main pump, including radial vane, spherical shell, it is characterised in that：It is additionally provided with pumping chamber guiding Device, the pumping chamber guider are located near spherical shell drain pipe, and just to the gate vane channel A of housing drain pipe after, by two Piece guide vane is constituted.

2. the spherical pumping chamber of seed nucleus main pump as claimed in claim 1, it is characterised in that：The guide vane of pumping chamber guider It is connected with back shroud.

3. the spherical pumping chamber of seed nucleus main pump as claimed in claim 1, it is characterised in that：The guide vane of pumping chamber guider Axially align on the outside of front end and stator back shroud.

4. the spherical pumping chamber of seed nucleus main pump as claimed in claim 1, it is characterised in that：The guide vane of pumping chamber guider Inlet side and radial vane outlet side radially aligned.