CN202597222U

CN202597222U - Rotor part of upper filling pump for nuclear power station

Info

Publication number: CN202597222U
Application number: CN 201220118734
Authority: CN
Inventors: 陆金琪; 张晓库
Original assignee: Shanghai Apollo Machinery Co Ltd
Current assignee: Shanghai Apollo Machinery Co Ltd
Priority date: 2012-03-27
Filing date: 2012-03-27
Publication date: 2012-12-12
Anticipated expiration: 2022-03-27

Abstract

The utility model discloses a rotor part of upper filling pump for a nuclear power station. The rotor part comprises a rotating shaft, and an impeller, a middle shaft sheath, a front shaft sheath, a thrust disc and a positioning sheath which are mounted on the rotating shaft in a sheathing manner, as well as a bearing sheath, wherein the impeller is formed by twelve stages of impellers including a first-stage impeller, second-stage to fourth-stage impellers and fifth-stage to twelfth-stage impeller; water inlets of the former four stages of impellers point to a driving end of the upper filling pump; the later eight stages of impellers are distributed in a way of being back-to-back with the former four stages of impellers; the middle shaft sheath is arranged between the fourth-stage impeller and the fifth-stage impeller; the front shaft sheath, the thrust disc and the positioning sheath are arranged in front of the head-stage impeller in sequence; and the rear bearing sheath is arranged at the rear part of the twelfth-stage impeller.

Description

Fill the rotor part of pump on a kind of used in nuclear power station

Technical field

The utility model relates on a kind of used in nuclear power station and fills pump, be specifically related to a kind of used in nuclear power station on fill the rotor part of pump.

Background technique

On fill the important component part that pump is cvcs (RCV), the major function of filling pump on this is following:

1) to reactor coolant loop water-filling stream is provided, thereby keeps normal liquid level in the voltage stabilizer;

2) provide cooling water, these current also to play for a sealing of three reactor coolant pumps and prevent the effect of high temperature coolant through seal leakage;

3), prevent the exposed of the middle reactor core of dehydration incident (LOCA) as safe injection pump.

Fill pump in nuclear power station, using at present and be generally horizontal, double hulled multistage centrifugal pump.Can produce bigger axial force when this kind multistage centrifugal pump runs up, in addition according to the nuclear power plant system requirement, on fill the requirement of pump hydraulic performance operating point have five; The range of flow span is big, add that the total head of pump is very high, and working flow is very little; Fill pump on also having and belong to the low specific speed pump in the centrifugal pump; The runner of impeller, stator is narrow, causes very difficulty of hydraulic part design, in addition; On fill the pump requirement and can both work at a plurality of flow operating points; Its span scope is well beyond the scope of general centrifugal pump, and especially small flow requires no range of instability (no hump), therefore needs a kind of ability of development to fill the rotor part of the requirement of five operating point properties of pump on satisfied.

Summary of the invention

The purpose of the utility model is in order to overcome the deficiency of existing technology; Provide a kind of used in nuclear power station on fill the rotor part of pump; On can satisfying, it fills the requirement of five operating point properties of pump; Avoided the setting of balanced controls, the axial force balance mechanism interlock will not take place and made the accident of rotating shaft fracture.

Realize the technological scheme of above-mentioned purpose: the rotor part that fills pump on a kind of used in nuclear power station; Comprise rotating shaft and be sleeved on the impeller in the rotating shaft, middle axle sleeve, front shaft sleeve, thrust disc and setting sleeve; Rear axle bearing sleeve, said impeller are made up of ten sencond stage impellers, wherein:

Said ten sencond stage impellers comprise first stage impeller, two to level Four impeller and five to ten sencond stage impellers, fill the drive end of pump on the sensing of the water intake of preceding level Four impeller is said, back eight grades of impellers and the back-to-back layout of preceding level Four impeller;

Said jack shaft is set between said fourth stage impeller and the said level V impeller;

Said front shaft sleeve, thrust disc and setting sleeve are located at the place ahead of said first stage impeller successively;

Said rear bearing is set in the rear portion of said the tenth sencond stage impeller.

Fill the rotor part of pump on the above-mentioned used in nuclear power station; Wherein, Said first stage impeller, two comprises wheel hub, forward and backward cover plate and some blades respectively to level Four impeller and five to ten sencond stage impellers; Said wheel hub is connected with said back shroud, and said some blades are connected respectively between the forward and backward cover plate in uniform way, the equal diameters of said forward and backward cover plate; The inlet diameter of said first stage impeller is 11～14 with the ratio of exit width and outlet diameter: 1: 5.5～7.5; Said two ratios to the inlet diameter of level Four impeller and exit width and outlet diameter are 18.5～20.5: 1: 8.5～10.5; The inlet diameter of said five to ten sencond stage impellers is 19.5～21.5 with the ratio of exit width and outlet diameter: 1: 9.5～11.5.

Fill the rotor part of pump on the above-mentioned used in nuclear power station, wherein, the hub length of said first stage impeller is shorter than said two to the hub length of level Four impeller and the hub length of said five to ten sencond stage impellers.

Fill the rotor part of pump on the above-mentioned used in nuclear power station, wherein, the blade quantity of said first stage impeller and said two blade quantities to the level Four impeller are five, and the blade quantity of said five to ten sencond stage impellers is three.

Fill the rotor part of pump on the above-mentioned used in nuclear power station, wherein, said ten sencond stage impellers are installed in the said rotating shaft through snap ring and driving key respectively.

Fill the rotor part of pump on the above-mentioned used in nuclear power station, wherein, said front shaft sleeve, thrust disc and setting sleeve are fixed in the said rotating shaft through locking nut; Said rear axle bearing sleeve is fixed in the said rotating shaft through locking nut.

Fill the technological scheme of the rotor part of pump on the used in nuclear power station of the utility model; Constitute by ten secondarys; Be respectively first stage impeller, two to level Four impeller, five to ten sencond stage impellers and with three kinds of impeller optimum organizations, fill the requirement of five operating point properties of pump on can satisfying.Preceding level Four suction eye points to drive end; Eight grades of impellers in back and the back-to-back layout of preceding level Four impeller; The pressure of spindle nose end is the pressure of fourth stage impeller outlet; Residual axial force is born by the thrust-bearing of two-sided John Cameron Mitchell formula, has avoided the setting of balanced controls, the axial force balance mechanism interlock will not take place and makes the accident of rotating shaft fracture.

Description of drawings

Fig. 1 is for filling the structural representation of the rotor part of pump on the used in nuclear power station of the utility model;

Fig. 2 a, Fig. 2 b, Fig. 2 c be respectively the utility model used in nuclear power station on fill first stage impeller, two structural representations in the rotor part of pump to level Four impeller, five to ten sencond stage impellers.

Embodiment

In order to understand the technological scheme of the utility model better, below through embodiment particularly and combine accompanying drawing at length to explain:

See also Fig. 1, fill the rotor part of pump on a kind of used in nuclear power station of the utility model, comprise rotating shaft 10 and be sleeved on impeller, middle axle sleeve 4, front shaft sleeve 5, thrust disc 6, setting sleeve 7, rear axle bearing sleeve 8 and the locking nut 9 in the rotating shaft 10, wherein,

Impeller is made up of ten sencond stage impellers, and this ten sencond stage impeller comprises that first stage impeller 1, two is to level Four impeller 2, five to ten sencond stage impellers 3.On pointing to, fills the water intake of preceding level Four impeller the drive end of pump, back eight grades of impellers and the back-to-back symmetric arrangement of preceding level Four impeller;

Ten sencond stage impellers are installed in the rotating shaft 10 through snap ring 101 and driving key 102 respectively;

Middle axle sleeve 4 is located between fourth stage impeller 2 and the level V impeller 3;

Front shaft sleeve 5, thrust disc 6 and setting sleeve 7 are fixed in the rotating shaft 10 through locking nut 9 and are located at the place ahead of first stage impeller 1;

Rear axle bearing sleeve 8 is fixed in the rotating shaft 10 through locking nut 9 and is located at the rear portion of the tenth sencond stage impeller 3.

See also Fig. 2 a, Fig. 2 b, Fig. 2 c again, first stage impeller 1, two comprises

wheel hub

11,21,31

front shrouds

12,22,32,

back shroud

13,23,33 and some

blades

14,24,34 respectively to level Four impeller 2 and five to ten sencond stage impellers 3, wherein,

Wheel hub

11,21,31 is connected with

back shroud

13,23,33, and some

blades

14,24,34 are connected

front shroud

12,22,32 and back

shroud

13,23 respectively in uniform way, between 33;

The equal diameters of

front shroud

12,22,32 and back

shroud

13,23,33;

The inlet diameter D11 of first stage impeller 1 is 11～14 with the ratio of exit width L1 and outlet diameter D12: 1: 5.5～7.5;

Two to the inlet diameter D21 of level Four impeller 2 with the ratio of exit width L2 and outlet diameter D22 be 18.5～20.5: 1: 8.5～10.5;

The inlet diameter D31 of five to ten sencond stage impellers 3 is 19.5～21.5 with the ratio of exit width L3 and outlet diameter D32: 1: 9.5～11.5;

The wheel hub 11 of first stage impeller 1 be shorter in length than two length to the wheel hub 31 of the length of the wheel hub 21 of level Four impeller 2 and five to ten sencond stage impellers 3;

Blade 14 quantity of first stage impeller 1 and two blade 24 quantity to level Four impeller 2 are five, and blade 34 quantity of five to ten sencond stage impellers 3 are three.

The parameter designing of blade wheel structure; Because the factor of waterpower; The inlet diameter of impeller, exit width and outlet diameter change according to the factors vary of waterpower, in order to satisfy the requirement of big flow operating mode, the exit width of first stage impeller are suitably widened; And fill the anti-cavitation performance requirement of pump on first stage impeller has been taken into account, five to ten sencond stage impellers have been taken into account the flow-head curve steep drop characteristic that fills pump.Can significantly improve the efficient of filling pump, cut down the consumption of energy.

Every grade of impeller all is cast inblock, by snap ring 101 lockings and with driving key 102 transmitting torques, prevents loosening when rotated.The inside and outside end of the keyway and the shaft shoulder is equipped with fillet, concentrates to prevent obvious stress.In addition, the mode of Spielpassung is taked in impeller and rotating shaft, and for convenience detach and assembling the more important thing is when maintenance and conveniently radioactive material cleaned.When splining in the rotating shaft, take into full account the uniformity of the position of impeller blade, keyway is evenly distributed in the rotating shaft in 360 ° the scope.

The critical Speed Calculation first rank critical speed of rotation of rotating shaft is bigger more than 25% than maximum (top) speed, and this speed departs from all fully can predict excited frequency (being 50Hz).So rotating shaft is a rigidity.

Since on fill the anti-drive end of pump structure seal; The axial force of this structure pump is relevant with inlet pressure, thus total axial force respectively by act on the impeller, pump intake presses the three section axial power cause, centre and end bearing cause synthetic.The mode of filling the pump impeller combination on being somebody's turn to do is that drive end level Four and anti-drive end arrange that back-to-back three kinds of different impellers of inlet size make up cleverly for eight grades.The direction of axially making a concerted effort through calculating acts on the impeller is pointed to drive end, is born by the thrust-bearing of drive end, has avoided the setting of balanced controls, the axial force balance mechanism interlock will not take place and makes the accident of rotating shaft fracture.

Those of ordinary skill in the art will be appreciated that; Above embodiment is used for explaining the utility model; And be not the qualification that is used as the utility model; As long as in the connotation scope of the utility model, all will drop in claims scope of the utility model the above embodiment's variation, modification.

Claims

A used in nuclear power station on fill the rotor part of pump, comprise rotating shaft and be sleeved on the impeller in the rotating shaft, middle axle sleeve, front shaft sleeve, thrust disc and setting sleeve, rear axle bearing sleeve, said impeller are made up of ten sencond stage impellers, it is characterized in that,

Said ten sencond stage impellers comprise first stage impeller, two to level Four impeller and five to ten sencond stage impellers, fill the drive end of pump on the sensing of the water intake of preceding level Four impeller is said, back eight grades of impellers and the back-to-back layout of preceding level Four impeller;

Said jack shaft is set between said fourth stage impeller and the said level V impeller;

Said front shaft sleeve, thrust disc and setting sleeve are located at the place ahead of said first stage impeller successively;

Said rear bearing is set in the rear portion of said the tenth sencond stage impeller.
Used in nuclear power station according to claim 1 on fill the rotor part of pump; It is characterized in that; Said first stage impeller, two comprises wheel hub, forward and backward cover plate and some blades respectively to level Four impeller and five to ten sencond stage impellers; Said wheel hub is connected with said back shroud, and said some blades are connected respectively between the forward and backward cover plate in uniform way, the equal diameters of said forward and backward cover plate; The inlet diameter of said first stage impeller is 11～14 with the ratio of exit width and outlet diameter: 1: 5.5～7.5; Said two ratios to the inlet diameter of level Four impeller and exit width and outlet diameter are 18.5～20.5: 1: 8.5～10.5; The inlet diameter of said five to ten sencond stage impellers is 19.5～21.5 with the ratio of exit width and outlet diameter: 1: 9.5～11.5.
Used in nuclear power station according to claim 2 on fill the rotor part of pump, it is characterized in that the hub length of said first stage impeller is shorter than said two to the hub length of level Four impeller and the hub length of said five to ten sencond stage impellers.
Used in nuclear power station according to claim 2 on fill the rotor part of pump, it is characterized in that the blade quantity of said first stage impeller and said two blade quantities to the level Four impeller are five, the blade quantity of said five to ten sencond stage impellers is three.
Used in nuclear power station according to claim 1 on fill the rotor part of pump, it is characterized in that said ten sencond stage impellers are installed in the said rotating shaft through snap ring and driving key respectively.
Used in nuclear power station according to claim 1 on fill the rotor part of pump, it is characterized in that said front shaft sleeve, thrust disc and setting sleeve are fixed in the said rotating shaft through locking nut; Said rear axle bearing sleeve is fixed in the said rotating shaft through locking nut.