CN102606484A

CN102606484A - Charging pump for nuclear power station

Info

Publication number: CN102606484A
Application number: CN2012100832386A
Authority: CN
Inventors: 陆金琪; 毛燕萍
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: 2012-07-25
Also published as: WO2013143446A1

Abstract

The invention discloses a charging pump for a nuclear power station, which comprises a stator component, a rotor component, a bearing component and a shaft sealing device. The stator component comprises a pump head, a barrel and a tail board, the barrel comprises an outer shell and an inner shell, the rotor component comprises a rotary shaft, an impeller, a middle shaft sleeve, a front shaft sleeve, a thrust disc, a positioning sleeve and a rear bearing sleeve, wherein the impeller, the middle shaft sleeve, the front shaft sleeve, the thrust disc, the positioning sleeve and the rear bearing sleeve are sleeved on the rotary shaft, and the bearing component comprises a drive-end bearing, a middle auxiliary bearing and a non-driven-end bearing. The charging pump for the nuclear power station has the advantages that the size of the charging pump can be reduced, special performance requirements of the charging pump are met, and working efficiency is high.

Description

Fill pump on a kind of used in nuclear power station

Technical field

The present invention relates to fill pump on a kind of used in nuclear power station, be specifically related to a kind of used in nuclear power station on fill 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, bivalve body, multistage centrifugal pump.Can produce bigger axial force when 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; 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.There is following defective in this multistage centrifugal pump:

1) inlet/outlet is taken over and all is arranged on the urceolus, and in addition, the pump two ends all are provided with mechanical seal; Particularly the pressure that bears of the mechanical seal of high voltage terminal wants big relatively; Two ends all will be provided with the mechanical seal rinsing pipeline of external, and therefore general volume is bigger, and it is big to take the factory building space;

2) mostly inside and outside housing is overall structure; Mostly inner housing is that two ends fix, when pump under hot instantaneous conditions, because the inner housing medium temperature in moment great change takes place; Pump group especially inner housing can be because of the reason of expanding with heat and contract with cold in technical problems such as axial direction generation certain displacement; It is long that the overall structure of inner housing can cause inner flow passage in addition, make the sand removal of inner flow passage and polishing inconvenient, and the cast inblock difficulty is higher;

3) connection of runner is many between the impeller is realized that by stator or long runner the connection of runner is many between the impeller is realized by stator or long runner, is inconvenient to process and nondestructive test;

4) connect with modes such as screw, O shape circles usually between the multistage stator, so not only make pump structure complicated, and inconvenient dismounting and maintenance; Again because on fill in the medium that pump carries and contain radioactive material, this has increased the danger that the maintainer takes in radioactive material undoubtedly;

5) supporting often is 2 supports, promptly respectively establishes a bearing through pump drive end and anti-drive end and supports, and therefore makes the rigidity of rotating shaft not high enough, has influenced the working efficiency of filling pump.

Summary of the invention

The objective of the invention is in order to overcome the deficiency of existing technology, provide a kind of used in nuclear power station on fill pump, it can reduce the volume of pump, the property requirement of filling pump on satisfying, and high working efficiency.

Realize the technological scheme of above-mentioned purpose: fill pump on a kind of used in nuclear power station; Comprise that the said stator component of stator component, rotor part, bearing part and gland seal device comprises pump head, cylindrical shell and tailgate; Said cylindrical shell comprises frame and inner housing; Said rotor part comprises rotating shaft and is sleeved on the impeller in the rotating shaft, middle axle sleeve, front shaft sleeve, thrust disc, setting sleeve and rear axle bearing sleeve, and said bearing part comprises drive end bearing, middle auxiliary bearing and non-driven-end bearing, wherein:

Said pump head comprises main part disc structure and that offer axial bore, inlet hole and exit orifice;

The frame of said cylindrical shell is fixed on the ear end face of said pump head, the inner chamber of this frame comprise be positioned at before most inner casing body cavity and be positioned at the back fraction the rear bearing chamber;

The inner housing of said cylindrical shell is latter linked first plate, pump head side deflector, intermediate section, cylindrical shell side deflector, tail-hood and rear bearing cover for subdivision structure radially and before comprising successively, and said first plate, pump head side deflector, intermediate section, cylindrical shell side deflector and tail-hood connect the compartment of terrain, back and have the complete die cavity that holds impeller;

The first plate of the inner housing of said stator component is fixed on the ear end face of said pump head; So that the first half of said first plate, pump head side deflector, intermediate section, cylindrical shell side deflector, tail-hood is arranged in the inner casing body cavity of said frame; Latter half of and the rear bearing cover of said tail-hood is arranged in the rear bearing chamber of said frame, and makes the front-end face of ear end face and the said tailgate of said rear bearing cover have a space freely;

Impeller in the said rotor part is made up of ten sencond stage impellers; Said ten sencond stage impellers comprise that first stage impeller, two is to level Four impeller and five to ten sencond stage impellers; Fill the drive end of pump on the water intake sensing 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;

Said drive end bearing comprises upper ball cover, lower bearing body, forward and backward bearing (ball) cover, a two-sided thrust-bearing, a sliding bearing, two oil sealing chambers and two floating seals, and said upper ball cover and lower bearing body are connected on the front-end face of said pump head and fuse and constitute bearing chamber through forward and backward bearing (ball) cover; Said two-sided thrust-bearing is located in the said bearing chamber and is positioned at the rear and front end face of said thrust disc; Said sliding bearing is located in the said bearing chamber and is positioned at the front portion of said two-sided thrust-bearing; Said two oil sealing chambers are located in the said bearing chamber and lay respectively at the rear portion of said two-sided thrust-bearing and the front portion of said sliding bearing; Said two floating seals are located in two said oil sealing chambers one by one;

Auxiliary bearing is hydrodynamic journal liquid polymers and is located between said fourth stage impeller and the level V impeller that the front portion of the internal surface of this centre auxiliary bearing is provided with several rectangle water cavities with being uniformly distributed along the circumference in the middle of said,

Said non-driven-end bearing also is hydrodynamic journal liquid polymers and the rear portion that is located at ground ten sencond stage impellers, and the middle part of the internal surface of this non-driven-end bearing is provided with several I-shaped water cavities with being uniformly distributed along the circumference;

Said gland seal device is an integrated mechanical sealing, and this gland seal device is installed in the rotating shaft and is positioned at the front portion of the axial bore of said pump head.

Fill pump on the above-mentioned used in nuclear power station; Wherein, Axial bore on the said pump head is opened in the front/rear end central authorities of main part, and the inlet hole on the said pump head is opened on the outer circumferential face of main part and by the two sections that are communicated with and constitutes, and said inlet hole epimere is vertical with said axial bore; Said inlet hole hypomere becomes an obtuse angle with said inlet hole epimere, and the following aperture of said inlet hole hypomere is positioned on the ear end face of said main part; Exit orifice on the said pump head becomes 180 ° of ground to be opened on the outer circumferential face of main part and with said axial bore to be communicated with the inlet hole hypomere;

Fill pump on the above-mentioned used in nuclear power station, wherein, the ear end face of said first plate is provided with a volute chamber with the semi-spiral shape of 180 ° of symmetric arrangement; Said pump head side deflector is made up of three joint unit deflectors, is respectively equipped with a volute chamber with the semi-spiral shape of 180 ° of symmetric arrangement on the front/rear end of every joint unit deflector; Be respectively equipped with a volute chamber with the semi-spiral shape of 180 ° of symmetric arrangement on the front/rear end of said intermediate section; Said cylindrical shell side deflector constitute by seven joint unit deflectors and with the opposing installation of pump head side deflector; The front-end face of said tail-hood is provided with a volute chamber with the semi-spiral shape of 180 ° of symmetric arrangement; Axially offer corresponding positioning pin hole and connecting through hole on the front-end face of the front/rear end of the ear end face of said first plate, every joint unit deflector, the front/rear end of intermediate section and tail-hood respectively; Between three joint unit deflectors of said first plate, pump head side deflector and the intermediate section through pin with the pin-and-hole radial location on the front-end face of back one joint unit deflector and pass thru-bolt and the nut of said connecting through hole three joint unit deflectors and intermediate section axial locking relatively of the pin-and-hole on the ear end face of last joint unit deflector with first plate, pump head side deflector through one; Between seven joint unit deflectors of said intermediate section, cylindrical shell side deflector and the tail-hood through pin with the pin-and-hole radial location on the front-end face of back one joint unit deflector and pass thru-bolt and the nut of said connecting through hole seven joint unit deflectors and tail-hood axial locking relatively of the pin-and-hole on the ear end face of last joint unit deflector with intermediate section, cylindrical shell side deflector through one.

Fill pump on the above-mentioned used in nuclear power station; Wherein, Auxiliary bearing is made up of a cylinder and the flange that is connected cylinder one end in the middle of said; The middle part of the internal surface of said cylinder and rear portion are offered a back flow water pump and a water shutoff groove respectively, and central authorities radially offer a water inlet in the bottom surface of each rectangle water cavity, axially offer the osculum that some and said back flow water pump is communicated with on the front-end face of said cylinder; The outer surface of said cylinder is offered the inclined hole that some and said water shutoff groove is communicated with.

Fill pump on the above-mentioned used in nuclear power station, wherein, the bottom surface central authorities of each the I-shaped water cavity on the said non-driven-end bearing radially offer a water inlet.

Fill pump on the above-mentioned used in nuclear power station; Wherein, Said gland seal device comprises machine envelope axle sleeve, pressing plate, rotating ring, stationary seat, stationary ring, pressure ring, some springs and nockbush; Said machine envelope axle sleeve comprises that an axle sleeve body and is connected the cover dish of axle sleeve body rear end, and the front-end face of cover dish is provided with an annular groove, and this machine envelope axle sleeve is sleeved in the rotating shaft through locking plate regularly; Said pressing plate comprises a flange and is connected the sleeve on the flange ear end face, and the front-end face of flange is provided with a pit, and the inner cavity surface of this sleeve is high outside and low outside one-level step surface, on the step surface of the outside of sleeve, offers some blind holes in uniform way; This pressing plate is fixed on the front-end face of said pump head with this outer mode of cover dish external, that sleeve is enclosed within said machine envelope axle sleeve with gap of axle sleeve that its flange is enclosed within said machine envelope axle sleeve with gap; Said rotating ring is fixed in the annular groove of said machine envelope axle sleeve; Said stationary seat can be installed in the inner chamber of the sleeve of said pressing plate with moving axially; Said stationary ring be installed in said pressing plate sleeve inner chamber and be fixed on the ear end face of said stationary seat; Said pressure ring is sleeved on the outer end of said stationary ring and is fixed on the ear end face of said stationary seat; Said some springs are placed in the blind hole of said pressing plate one by one, and the rear end of these some springs is connected on the front-end face of said stationary seat, so that the ear end face of said stationary ring is fitted with the front-end face of said rotating ring all the time; Said nockbush is installed in the pit of said pressing plate.

Fill pump on the above-mentioned used in nuclear power station, wherein, also radially offer the machine envelope flushing hole that is communicated with said axial bore on the outer circumferential face of said main part.

Fill pump on the above-mentioned used in nuclear power station, wherein, also offer the flushing hole that is communicated with said barrel bore on the ear end face of the flange of said pressing plate.

Fill pump on the above-mentioned used in nuclear power station, wherein, the forward outer surface of said axle sleeve body is provided with a draw-in groove, in this draw-in groove, clamps a location piece, so that said pressing plate is resisted against on the ear end face of said location piece.

Fill pump on the used in nuclear power station of the present invention and have following structural feature:

1) general structure of pump is the bivalve body, and single shaft holds oil lubrication, the sealing of unit tool, high pressure side integral sealing.Cylindrical shell, pump head, tailgate decomposition pressure border.Do not have perforate on the cylindrical shell,, reduced difficulty of processing in the manufacture process, make things convenient for nondestructiving inspecting test because complete symmetrical cylindrical integral forging is adopted in the pressure boundary;

2) pump head solid forging, inlet/outlet flange are on same center line and be distributed in the pump head both sides; Pump head adopts protrusion circular tube structure form with the welding position of importing and exporting flange, conveniently the welding part is carried out defect detecting test;

3) the pump core components is subdivision structure radially, and the anti-drive end axial direction of pump core components is freely, under accident conditions, and axial extension in the time of can bearing thermal expansion;

4) locate through pin between deflector, unscrew turnbuckle and nut during maintenance, can clean deflector very easily, maintenance and assembling are all easily simple;

5) deflector is the integral casting forging piece, adopts 180 ° of symmetrical semi-spiral volute chamber structures, the radial force autobalance that impeller is in operation and produces; Deflector belongs to radially subdivision structure, can improve surface roughness through the polishing water passage surface, has improved the efficient of pump, when maintenance, runner is cleaned more easily, adheres to the radiation medium possibility and reduces, and guarantees maintenance man's safety;

6) each part on the rotor part and axle to cooperate be Spielpassung, impellers at different levels all pass through the snap ring location, need not heat when dismantling on the rotor part part, avoid the evaporation of pollutant; Convenient during maintenance to the flushing of the pollutant in the gap, guarantee maintenance man's safety;

7) pump has ten sencond stage impellers; Preceding level Four suction eye points to coupling; Eight grades of impellers in back and the back-to-back symmetric arrangement 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 two-sided thrust-bearing; Avoided the setting of balanced controls, the axial force balance mechanism interlock will not take place and the accident of off-axis;

8) adopt three kinds of impeller combinations, first stage impeller will be taken into account anti-cavitation performance, and five to ten sencond stage impellers are taken into account the steep drop characteristic of pump duty-head curve, fills the requirement of pump property on this combination dexterously is satisfied;

9) adopt labyrinth seal with the supporting casing ring of the forward and backward choma of impeller, contactless between assurance rotor part and the stator component, the wearing and tearing that can under accident conditions, bear thermal shock and particle-resistant water;

10) between the fourth stage and level V impeller and the pump anti-drive end be provided with the aiding support bearing, the oil-lubricated bearing of they and pump drive end forms the three-point support to rotor part, guarantees that at any operating mode lower rotor part all be rigidity;

11) anti-drive end of pump seals with tailgate, reduces a gland seal device and oil-lubricated bearing.Its advantage has:

A) balancing pipeline need be set, reduce instability because of balancing pipeline obstruction causing pump operation;

B) do not have the risk that machine seals does not just have shaft sealing leakage, and the machine envelope is changed engineering time and the cycle that brings;

C) lubricating oil pipeline and lubricants capacity have been reduced;

D) startup reduces the fault point to no pre-lubrication oil to reduce by a bearing arrangement, has improved the operational reliability of pump.

12) the pump drive end is provided with the two-sided thrust-bearing that bears axial force and the sliding bearing of bearing radial force.All be provided with oil sealing chamber and floating seal at the thrust-bearing and the sliding bearing outside,, so just realize very simply that no pre-lubrication starts in case pump will be preserved lubricant oil through initial launch between oil sealing chamber and floating seal;

13) the axle envelope of pump adopts cartridge mechanical seal, and adopts from the flushing scheme; Machine envelope flushing pipe and cyclone separator all design on pump head cleverly, and the outside does not have pipeline, and potential safety hazard has also just reduced.Be provided with nockbush on the mechanical seal pressing plate, even mechanical seal was lost efficacy, the shaft sealing leakage amount of pump is less than minimum requirements.

Description of drawings

Fig. 1 is for filling the pump structure schematic representation on the used in nuclear power station of the present invention;

Fig. 2 is for filling the structural representation of the stator component of pump on the used in nuclear power station of the present invention;

Fig. 3 is for filling the structural representation of the inner housing of pump on the used in nuclear power station of the present invention;

Fig. 4 is the structural representation of unit deflector in the stator component that fills pump on the used in nuclear power station of the present invention;

Fig. 5 is the structural representation of pump head in the stator component that fills pump on the used in nuclear power station of the present invention.

Fig. 6 is for filling the structural representation of the rotor part of pump on the used in nuclear power station of the present invention;

Fig. 7 a, Fig. 7 b, Fig. 7 c be respectively used in nuclear power station of the present invention on fill first stage impeller, two structural representations in the rotor part of pump to level Four impeller, five to ten sencond stage impellers;

Fig. 8 is for filling the structural representation of the drive end bearing of pump on the used in nuclear power station of the present invention;

Fig. 9 is for filling the structural representation of the intermediate bearing of pump on the used in nuclear power station of the present invention;

Figure 10 is for filling the structural representation of the non-driven-end bearing of pump on the used in nuclear power station of the present invention;

Figure 11 is for filling the structural representation of the gland seal device of pump on the used in nuclear power station of the present invention.

Embodiment

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

See also Fig. 1, the Fig. 1 that sees also of the present invention fills pump and comprises stator component 1, rotor part 2, bearing part and gland seal device 4 on the used in nuclear power station.Bearing part comprises drive end bearing 31, middle auxiliary bearing 32 and non-driven-end bearing 33.

See also Fig. 2 again, latter linked pump head 11, cylindrical shell and tailgate 14 before the stator component that fills pump on the used in nuclear power station of the present invention comprises successively.Wherein, cylindrical shell comprises frame 12 and inner housing 13, and cylindrical shell and pump-foot coupled position are provided with cylindrical shell slideway piece 130, fills pump in the assurance and removes and installs resetting property height; Simultaneously, in accident conditions operation, axial extension when making stator component bear thermal expansion does not influence the center of pump and the center of booster engine, the performability and the stability of assurance pump group; Frame 13 is fixed on the ear end face of pump head 11, the inner chamber of this frame 13 comprise be positioned at before most inner casing body cavity and be positioned at the back fraction the rear bearing chamber.

See also Fig. 3 again, inner housing 12 is for subdivision structure radially and comprise first plate 121, pump head side deflector 122, intermediate section 123, cylindrical shell side deflector 124, tail-hood 125, rear bearing cover 126 and the seal ring 1200 that connects successively.Wherein:

The ear end face of first plate 121 is provided with a volute chamber with the semi-spiral shape of 180 ° of symmetric arrangement;

Pump head side deflector 122 is made up of three joint unit deflectors 120, is respectively equipped with a volute chamber with the semi-spiral shape of 180 ° of symmetric arrangement on the front/rear end of every joint unit deflector 120;

Be respectively equipped with a volute chamber with the semi-spiral shape of 180 ° of symmetric arrangement on the front/rear end of intermediate section 123;

Cylindrical shell side deflector 124 constitute by seven joint unit deflectors 120 and with the 122 opposing installations of pump head side deflector;

The front-end face of tail-hood 125 is provided with a volute chamber with the semi-spiral shape of 180 ° of symmetric arrangement;

Axially offer corresponding positioning pin hole and connecting through hole respectively on the front/rear end of the ear end face of first plate 121, the front/rear end of every joint unit deflector 120, intermediate section 123 and the front-end face of tail-hood 125;

Between three joint unit deflectors 120 of first plate 121, pump head side deflector 122 and the intermediate section 123 through pin 127 with the pin-and-hole on the ear end face of last joint unit deflector 120 relatively the pin-and-hole radial location on the front-end face of back one joint unit deflector 120 and through one pass connecting through hole thru-bolt 128 and nut 129 with the three joint unit deflectors 120 and intermediate section 123 axial lockings of first plate 121, pump head side deflector 122; Between seven joint unit deflectors 120 of intermediate section 123, cylindrical shell side deflector 124 and the tail-hood 125 through pin 127 with the pin-and-hole radial location on the front-end face of back one joint unit deflector 120 and pass thru-bolt 128 and the nut 129 of connecting through hole seven joint unit deflectors 120 and tail-hood 125 axial lockings relatively of the pin-and-hole on the ear end face of last joint unit deflector 120 with intermediate section 123, cylindrical shell side deflector 124 through one;

First plate 121, pump head side deflector 122, intermediate section 123, cylindrical shell side deflector 124 and tail-hood 125 connect the compartment of terrain, back and have the complete die cavity that holds impeller, the radial force autobalance that can impeller is in operation and produce.

See also Fig. 4 again, be respectively equipped with a volute chamber 1211,1211 ' with the semi-spiral shape of 180 ° of symmetric arrangement on the front/rear end of every joint unit deflector 120, so that the deflector compartment of terrain after connecting has the complete die cavity that holds impeller; The diapire central authorities of the preceding volute chamber 1211 of every joint unit deflector 120 also offer a suction port 1213 respectively; The diapire central authorities of back volute chamber 1211 ' offer a discharge opening 1214; Also have a pumping chamber 1212 between the both ends of the surface of every joint unit deflector, axially offer corresponding positioning pin hole 1215 and connecting through hole 1216 on the front/rear end of every joint unit deflector 120 respectively; Axially offer runner 1217 respectively on the front-end face of every joint unit deflector 120.

Seal ring 1200 is installed on the hole wall of suction port and discharge opening of every joint unit deflector 120, and the inner hole wall of each seal ring 1200 is provided with some labyrinth sealing grooves, can avoid wearing and tearing and the destruction of suspended solid to flow passage components.

The position structure of pump head side deflector 122 and cylindrical shell side deflector 124; Significantly reduce every joint deflector and connected required number of spare parts; Only need unscrew the nut of thru-bolt 12 during maintenance, just can clean deflector easily, make the maintenance of deflector and assembling all easily simple.

The material of seal ring 1200 is a Martensitic Stain Less Steel; Make their surperficial difference of hardness greater than 50HB through heat treatment; This has just guaranteed between impeller and the deflector on the rotor part contactless; Suspended solid can be hidden when pump operation in the labyrinth sealing groove of seal ring, so just avoids wearing and tearing and the destruction of suspended solid to flow passage components, thus integrity, performability and the stability of filling pump equipment under accident conditions on guaranteeing.

See also Fig. 5 again and combine and consult Fig. 2, pump head 11 comprises the main part of disc structure and is connected suction flange 15 and the outlet(discharge) flange 16 on the main part, offers axial bore 111, inlet hole 112 and exit orifice 113 on this main part.Wherein:

Axial bore 111 is opened in the front/rear end central authorities of main part;

Inlet hole 112 is opened on the outer circumferential face of main part and by the two sections that are communicated with and constitutes, and the inlet hole epimere is vertical with axial bore 111, and the inlet hole hypomere becomes an obtuse angle with the inlet hole epimere, and the following aperture of inlet hole hypomere is positioned on the ear end face of main part;

Exit orifice 113 becomes 180 ° of ground to be opened on the outer circumferential face of main part and with axial bore 111 to be communicated with the inlet hole epimere;

Also radially offer the machine envelope flushing hole 114 that is communicated with axial bore 111 on the outer circumferential face of main part;

Suction flange 15 is connected on the outer circumferential face of main part through welding manner and with inlet hole 112 coaxially;

Outlet(discharge) flange 16 is connected on the outer circumferential face of main part through welding manner and with exit orifice 112 coaxially;

For ease the welding part is carried out defect detecting test, also be provided with boss with the position that outlet(discharge) flange 16 is connected on the outer circumferential face of main part with suction flange 15.During maintenance, just can whole pump be lifted as long as unclamp the bolt of suction flange 15 and outlet(discharge) flange 16.

Pump head 11 is also in the position that connects with pump-foot; The front-end face that is main part connects two positioning keys 17; And on the outer circumferential face of main part, connect a pump head slideway piece 18; Both guaranteed to fill the location and installation of pump, and made the pump assembling and dismantling unload again resetting property height is installed, thus the performability and the stability of assurance pump group.

The first plate 121 of inner housing 12 is fixed on the ear end face of pump head 11; So that the first half of first plate 121, pump head side deflector 122, intermediate section 123, cylindrical shell side deflector 124, tail-hood 125 is arranged in the inner casing body cavity of frame 13; Latter half of and the rear bearing cover 126 of tail 125 lid is arranged in the rear bearing chamber of frame 13, and makes the front-end face of ear end face and the tailgate 14 of rear bearing cover 126 have a space freely.

Pump head 11 is fixed on the cylindrical shell by double-screw bolt, nuts and washers with tailgate 14; Between pump head 11 and the cylindrical shell, all adopt seal with O ring between cylindrical shell and the tailgate 14.

See also Fig. 6 again, rotor part 2 comprises rotating shaft 20 and is sleeved on impeller, middle axle sleeve 24, front shaft sleeve 25, thrust disc 26, setting sleeve 27, rear axle bearing sleeve 28 and the locking nut 29 in the rotating shaft 20, wherein,

Impeller is made up of ten sencond stage impellers, and this ten sencond stage impeller comprises that first stage impeller 21, two is to level Four impeller 22, five to ten sencond stage impellers 23.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 20 through snap ring 201 and driving key 202 respectively;

Middle axle sleeve 24 is located between fourth stage impeller 22 and the level V impeller 3;

Front shaft sleeve 25, thrust disc 26 and setting sleeve 27 are fixed in the rotating shaft 20 through locking nut 29 and are located at the place ahead of first stage impeller 21;

Rear axle bearing sleeve 28 is fixed in the rotating shaft 20 through locking nut 29 and is located at the rear portion of the tenth sencond stage impeller 23.

See also Fig. 7 a, Fig. 7 b, Fig. 7 c again; First stage impeller 21, two comprises wheel hub 211,221,231 front shrouds 212,222,232, back shroud 213,223,233 and some blades 214,224,234 respectively to level Four impeller 22 and five to ten sencond stage impellers 23; Wherein

Wheel hub 211,221,231 is connected with back shroud 213,223,233, and some blades 214,224,234 are connected front shroud 212,222,232 and back shroud 213,223 respectively in uniform way, between 233;

The equal diameters of front shroud 212,222,232 and back shroud 213,223,233;

The inlet diameter D11 of first stage impeller 21 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 22 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 23 is 19.5～21.5 with the ratio of exit width L3 and outlet diameter D32: 1: 9.5～11.5;

The wheel hub 211 of first stage impeller 21 be shorter in length than two length to the wheel hub 231 of the length of the wheel hub 221 of level Four impeller 22 and five to ten sencond stage impellers 23;

First stage impeller 21 and blade 214 quantity and two blade 224 quantity to level Four impeller 22 be five, blade 234 quantity of five to ten sencond stage impellers 23 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 21 are suitably widened; And first stage impeller 21 has been taken into account the anti-cavitation performance requirement of filling pump, and five to ten sencond stage impellers 23 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 201 lockings and with driving key 202 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, and 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.

See also Fig. 8 again; Drive end bearing 31 comprise upper ball cover 311, lower bearing body 312, forward and backward bearing (ball) cover 313,314,, a two-sided thrust-bearing 315, a sliding bearing 316, two oil sealing chambers 317, two floating seals 318 and bearing support blocks 319, wherein:

In upper ball cover 311, lower bearing body 312 fuse through forward and backward bearing (ball) cover 313,314 that the back constitutes bearing chamber and thrust disc 26 are included in;

Two-sided thrust-bearing 315 comprises two thrust block pads, and these two thrust block pads are located in the bearing chamber respectively and are positioned at the rear and front end face of thrust disc 26;

Sliding bearing 316 comprises bush seat and is positioned at the bearing shell of bush seat inner chamber that this radial sliding bearing 316 is located in the bearing chamber and is positioned at the front portion of two-sided thrust-bearing 6;

Two oil sealing chambers 317 are located in the bearing chamber and lay respectively at the rear portion of two-sided thrust-bearing 315 and the front portion of radial sliding bearing 316;

Two floating seals 318 are located in two oil sealing chambers 317 one by one;

Bearing support block 319 is connected the bottom of lower bearing body 312, is used for spring bearing.

Two-sided thrust-bearing 315 is used for bearing axial force; Sliding bearing 316 is used for bearing radial force; And all be provided with oil sealing chamber 317 and floating seal 318 in the two-sided thrust-bearing 315 and sliding bearing 316 outsides; In case on fill pump through initial launch, will preserve lubricant oil in

oil sealing chamber

317 and 318 of floating seals, that so just realize the pump group very simply need not the pre-lubrication startup.

See also Fig. 9 again, middle auxiliary bearing 32 is hydrodynamic journal liquid polymers, and it is made up of a cylinder 321 and the flange 322 that is connected cylinder 321 1 ends, wherein:

The middle part of the internal surface of cylinder 321 and rear portion are offered a back flow water pump 323 and a water shutoff groove 324 respectively;

The front portion of the internal surface of cylinder 321 is provided with several rectangle water cavities 325 with being uniformly distributed along the circumference, to form circumference property moisture film, can when pump is static, make the area of contact of rotating shaft and bearing little, and pump is when operation, and friction area is little, thereby makes power consumpiton little, and temperature rise is low; Central authorities radially offer a water inlet 3250 in the bottom surface of each rectangle water cavity 325; Each water inlet 3250 is the little one-level step hole of outer imperial palace;

Axially offer some osculums 3230 that are communicated with back flow water pump 3 on the front-end face of cylinder 321 and between adjacent two rectangle water cavities 5;

The outer surface of cylinder 321 is offered some inclined holes 3240 that are communicated with water shutoff groove 324.

See also Figure 10 again, non-driven-end bearing 33 also is hydrodynamic journal liquid polymers, and it is a cylindrical structure; The middle part of the internal surface of cylinder is provided with several I-shaped water cavities 331 with being uniformly distributed along the circumference; To form circumference property moisture film, make pump area of contact of rotating shaft and bearing when static big, resistance to shock is good; The moisture film extruding force is big, plays a part to protect rotor and reduce wear; Central authorities radially offer a water inlet 332 in the bottom surface of each I-shaped water cavity 331, and water inlet 332 is the little one-level step hole of outer imperial palace.

See also Figure 11 again; Gland seal device 4 is installed in the rotating shaft 20 and is positioned at the front portion of the axial bore 111 of the pump head 11 that fills pump; Gland seal device 4 comprises machine envelope axle sleeve 41, pressing plate 42, rotating ring 43, stationary seat 44, stationary ring 45, pressure ring 46, some springs 47, nockbush 48, location piece 49 and locking plate 411, wherein:

Machine envelope axle sleeve 41 comprises that an axle sleeve body and is connected the cover dish of axle sleeve body rear end, and the front-end face of cover dish is provided with an annular groove, and the forward outer surface of axle sleeve body is provided with a draw-in groove, and this machine envelope axle sleeve is sleeved in the rotating shaft 20 through locking plate 411 regularly;

Pressing plate 42 comprises a flange and is connected the sleeve on the flange ear end face, and the front-end face of flange is provided with a pit, and the inner cavity surface of this sleeve is high outside and low outside one-level step surface, on the step surface of the outside of sleeve, offers some blind holes in uniform way; This pressing plate 42 is fixed on the front-end face of pump head 11 with this outer mode of cover dish external, that sleeve is enclosed within machine envelope axle sleeve 41 with gap of axle sleeve that its flange is enclosed within machine envelope axle sleeve 1 with gap through radial location pin 421; Also offer the flushing hole 422 that is communicated with barrel bore on the ear end face of the flange of pressing plate 42;

Rotating ring 43 is fixed in the annular groove of machine envelope axle sleeve 41, to rotate with rotating shaft 20;

Stationary seat 44 can be installed in through radial location pin 440 in the inner chamber of sleeve of pressing plate 42 with moving axially;

Stationary ring 45 be installed in pressing plate 42 sleeve inner chamber and be fixed on the ear end face of stationary seat 44;

Pressure ring 46 is sleeved on the outer end of stationary ring 45 and is fixed on the ear end face of stationary seat 44;

Some springs 47 are placed in the blind hole of pressing plate 42 one by one, and the rear end of these some springs 47 is connected on the front-end face of stationary seat 4, so that the ear end face of stationary ring 45 is fitted with the front-end face of rotating ring 43 all the time;

Nockbush 48 is installed in the pit of pressing plate 42 through radial location pin 480;

Location piece 49 is installed in the draw-in groove of machine envelope axle sleeve 41, so that pressing plate 42 is resisted against on the ear end face of location piece 49.

Between the inner cavity surface and rotating shaft 20 of machine envelope axle sleeve 41, between the flange ear end face and pump head 11 of pressing plate 42, between the sleeve outer surface and pump head 11 of pressing plate 42, between the inner cavity surface and stationary seat 44 of the sleeve of pressing plate 42, the outer surface and the machine of rotating ring 43 seal between the axle sleeve 41, between the front-end face and stationary seat 44 of stationary ring 45, be respectively equipped with O-ring seals 412 between the outer surface of stationary ring 45 and the pressure ring 46.

The working principle of gland seal device 4 is: in the pump operation process; In the chamber that the mechanical seal chamber of pump head 11 and pressing plate 42 constitute, can form to be full of and have the certain pressure fed sheet of a media; Because the both ends of the surface area that rotating ring 43 is stressed does not wait; Can form impacting force, and stationary ring 45 fits the surface of contact appropriateness that forms between rotating ring 43 and the stationary ring 45 through spring 47, keeps the purpose that one deck liquid film as thin as a wafer reaches sealing between this surface of contact thereby so make to stationary ring 45;

Also offer the flushing hole 422 that is communicated with barrel bore on the ear end face of the flange of pressing plate 42; Be communicated with the flushing hole of offering on the pump head 11 114; The outside need not be provided with flushing line; And be furnished with cyclone hydraulic separators, and be used for the impurity and the unclean suspended matter of medium are separated effectively, clean medium is used for the flushing of the surface of contact of rotating ring 43 and stationary ring 45 and the heat of taking away generation.

In addition, after rotating ring 43 and stationary ring 45 lost efficacy, nockbush 48 can reduce the leakage rate of mechanical seal effectively, guaranteed that the maximum leakage amount is less than minimum requirements.

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

Claims

A used in nuclear power station on fill pump; Comprise that the said stator component of stator component, rotor part, bearing part and gland seal device comprises pump head, cylindrical shell and tailgate; Said cylindrical shell comprises frame and inner housing, and said rotor part comprises rotating shaft and be sleeved on the impeller in the rotating shaft, middle axle sleeve, front shaft sleeve, thrust disc, setting sleeve and rear axle bearing sleeve that said bearing part comprises drive end bearing, middle auxiliary bearing and non-driven-end bearing; It is characterized in that

Said pump head comprises main part disc structure and that offer axial bore, inlet hole and exit orifice;

The frame of said cylindrical shell is fixed on the ear end face of said pump head, the inner chamber of this frame comprise be positioned at before most inner casing body cavity and be positioned at the back fraction the rear bearing chamber;

The inner housing of said cylindrical shell is latter linked first plate, pump head side deflector, intermediate section, cylindrical shell side deflector, tail-hood and rear bearing cover for subdivision structure radially and before comprising successively, and said first plate, pump head side deflector, intermediate section, cylindrical shell side deflector and tail-hood connect the compartment of terrain, back and have the complete die cavity that holds impeller;

The first plate of the inner housing of said stator component is fixed on the ear end face of said pump head; So that the first half of said first plate, pump head side deflector, intermediate section, cylindrical shell side deflector, tail-hood is arranged in the inner casing body cavity of said frame; Latter half of and the rear bearing cover of said tail-hood is arranged in the rear bearing chamber of said frame, and makes the front-end face of ear end face and the said tailgate of said rear bearing cover have a space freely;

Impeller in the said rotor part is made up of ten sencond stage impellers; Said ten sencond stage impellers comprise that first stage impeller, two is to level Four impeller and five to ten sencond stage impellers; Fill the drive end of pump on the water intake sensing 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;

Said drive end bearing comprises upper ball cover, lower bearing body, forward and backward bearing (ball) cover, a two-sided thrust-bearing, a sliding bearing, two oil sealing chambers and two floating seals, and said upper ball cover and lower bearing body are connected on the front-end face of said pump head and fuse and constitute bearing chamber through forward and backward bearing (ball) cover; Said two-sided thrust-bearing is located in the said bearing chamber and is positioned at the rear and front end face of said thrust disc; Said sliding bearing is located in the said bearing chamber and is positioned at the front portion of said two-sided thrust-bearing; Said two oil sealing chambers are located in the said bearing chamber and lay respectively at the rear portion of said two-sided thrust-bearing and the front portion of said sliding bearing; Said two floating seals are located in two said oil sealing chambers one by one;

Auxiliary bearing is hydrodynamic journal liquid polymers and is located between said fourth stage impeller and the level V impeller that the front portion of the internal surface of this centre auxiliary bearing is provided with several rectangle water cavities with being uniformly distributed along the circumference in the middle of said,

Said non-driven-end bearing also is hydrodynamic journal liquid polymers and the rear portion that is located at ground ten sencond stage impellers, and the middle part of the internal surface of this non-driven-end bearing is provided with several I-shaped water cavities with being uniformly distributed along the circumference;

Said gland seal device is an integrated mechanical sealing, and this gland seal device is installed in the rotating shaft and is positioned at the front portion of the axial bore of said pump head.
Used in nuclear power station according to claim 1 on fill pump; It is characterized in that; Axial bore on the said pump head is opened in the front/rear end central authorities of main part, and the inlet hole on the said pump head is opened on the outer circumferential face of main part and by the two sections that are communicated with and constitutes, and said inlet hole epimere is vertical with said axial bore; Said inlet hole hypomere becomes an obtuse angle with said inlet hole epimere, and the following aperture of said inlet hole hypomere is positioned on the ear end face of said main part; Exit orifice on the said pump head becomes 180 ° of ground to be opened on the outer circumferential face of main part and with said axial bore to be communicated with the inlet hole hypomere;
Used in nuclear power station according to claim 1 on fill pump, it is characterized in that,

The ear end face of said first plate is provided with a volute chamber with the semi-spiral shape of 180 ° of symmetric arrangement;

Said pump head side deflector is made up of three joint unit deflectors, is respectively equipped with a volute chamber with the semi-spiral shape of 180 ° of symmetric arrangement on the front/rear end of every joint unit deflector;

Be respectively equipped with a volute chamber with the semi-spiral shape of 180 ° of symmetric arrangement on the front/rear end of said intermediate section;

Said cylindrical shell side deflector constitute by seven joint unit deflectors and with the opposing installation of pump head side deflector;

The front-end face of said tail-hood is provided with a volute chamber with the semi-spiral shape of 180 ° of symmetric arrangement;

Axially offer corresponding positioning pin hole and connecting through hole on the front-end face of the front/rear end of the ear end face of said first plate, every joint unit deflector, the front/rear end of intermediate section and tail-hood respectively;

Between three joint unit deflectors of said first plate, pump head side deflector and the intermediate section through pin with the pin-and-hole radial location on the front-end face of back one joint unit deflector and pass thru-bolt and the nut of said connecting through hole three joint unit deflectors and intermediate section axial locking relatively of the pin-and-hole on the ear end face of last joint unit deflector with first plate, pump head side deflector through one; Between seven joint unit deflectors of said intermediate section, cylindrical shell side deflector and the tail-hood through pin with the pin-and-hole radial location on the front-end face of back one joint unit deflector and pass thru-bolt and the nut of said connecting through hole seven joint unit deflectors and tail-hood axial locking relatively of the pin-and-hole on the ear end face of last joint unit deflector with intermediate section, cylindrical shell side deflector through one.
Used in nuclear power station according to claim 1 on fill pump; It is characterized in that; Auxiliary bearing is made up of a cylinder and the flange that is connected cylinder one end in the middle of said; The middle part of the internal surface of said cylinder and rear portion are offered a back flow water pump and a water shutoff groove respectively, and central authorities radially offer a water inlet in the bottom surface of each rectangle water cavity, axially offer the osculum that some and said back flow water pump is communicated with on the front-end face of said cylinder; The outer surface of said cylinder is offered the inclined hole that some and said water shutoff groove is communicated with.
Used in nuclear power station according to claim 1 on fill pump, it is characterized in that the bottom surface central authorities of each the I-shaped water cavity on the said non-driven-end bearing radially offer a water inlet.
Used in nuclear power station according to claim 1 on fill pump, it is characterized in that said gland seal device comprises machine envelope axle sleeve, pressing plate, rotating ring, stationary seat, stationary ring, pressure ring, some springs and nockbush,

Said machine envelope axle sleeve comprises that an axle sleeve body and is connected the cover dish of axle sleeve body rear end, and the front-end face of cover dish is provided with an annular groove, and this machine envelope axle sleeve is sleeved in the rotating shaft through locking plate regularly;

Said pressing plate comprises a flange and is connected the sleeve on the flange ear end face, and the front-end face of flange is provided with a pit, and the inner cavity surface of this sleeve is high outside and low outside one-level step surface, on the step surface of the outside of sleeve, offers some blind holes in uniform way; This pressing plate is fixed on the front-end face of said pump head with this outer mode of cover dish external, that sleeve is enclosed within said machine envelope axle sleeve with gap of axle sleeve that its flange is enclosed within said machine envelope axle sleeve with gap;

Said rotating ring is fixed in the annular groove of said machine envelope axle sleeve;

Said stationary seat can be installed in the inner chamber of the sleeve of said pressing plate with moving axially;

Said stationary ring be installed in said pressing plate sleeve inner chamber and be fixed on the ear end face of said stationary seat;

Said pressure ring is sleeved on the outer end of said stationary ring and is fixed on the ear end face of said stationary seat;

Said some springs are placed in the blind hole of said pressing plate one by one, and the rear end of these some springs is connected on the front-end face of said stationary seat, so that the ear end face of said stationary ring is fitted with the front-end face of said rotating ring all the time;

Said nockbush is installed in the pit of said pressing plate.
Used in nuclear power station according to claim 1 on fill pump, it is characterized in that, also radially offer the machine envelope flushing hole that is communicated with said axial bore on the outer circumferential face of said main part.
Used in nuclear power station according to claim 6 on fill pump, it is characterized in that, also offer the flushing hole that is communicated with said barrel bore on the ear end face of the flange of said pressing plate.
Used in nuclear power station according to claim 6 on fill pump, it is characterized in that the forward outer surface of said axle sleeve body is provided with a draw-in groove, in this draw-in groove, clamp a location piece, so that said pressing plate is resisted against on the ear end face of said location piece.