CN102606536A - Coolant drain tank pump for nuclear reactor - Google Patents
Coolant drain tank pump for nuclear reactor Download PDFInfo
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- CN102606536A CN102606536A CN2012100833302A CN201210083330A CN102606536A CN 102606536 A CN102606536 A CN 102606536A CN 2012100833302 A CN2012100833302 A CN 2012100833302A CN 201210083330 A CN201210083330 A CN 201210083330A CN 102606536 A CN102606536 A CN 102606536A
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- 239000002826 coolant Substances 0.000 title abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000011010 flushing procedure Methods 0.000 claims abstract description 17
- 229920001971 elastomer Polymers 0.000 claims abstract description 16
- 238000002347 injection Methods 0.000 claims abstract description 11
- 239000007924 injection Substances 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims description 75
- 239000000659 freezing mixture Substances 0.000 claims description 38
- 210000004907 gland Anatomy 0.000 claims description 15
- 238000005086 pumping Methods 0.000 claims description 15
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 238000005538 encapsulation Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 6
- 239000000428 dust Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 239000004696 Poly ether ether ketone Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920002530 polyetherether ketone Polymers 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
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Abstract
The invention discloses a structurally compact coolant drain tank pump for a nuclear reactor, which comprises a stator component, a rotor component, a bearing component, a mechanical seal device and a mechanical seal flushing pipeline. The stator component comprises a pump cover, a pump body, a connecting pipe, a bottom plate, a support and a motor frame which are sequentially connected from bottom to top, and the rotor component comprises a pump shaft, an impeller, a locking nut and a locking bolt. A suction inlet is axially arranged on the pump cover; the pump body comprises a pressurized water chamber; an outlet opening is radially arranged on the lateral face of the pressurized water chamber; the upper end of the bottom plate is further connected with a mechanical seal cavity; a flushing water injection flow channel and a flushing water drain flow channel are arranged in the mechanical seal cavity; the bearing component comprises an upper end bearing and a lower end bearing; the upper end bearing includes a pair of angular contact ball bearings; the lower end bearing is a guide bearing; the guide bearing comprises a metal outer sleeve and a sliding bush embedded into an inner cavity of the metal outer sleeve in an interference fit manner; the sliding bush is made of engineering rubber; and the mechanical seal device is an integrated double-end-face mechanical seal device and is mounted in the mechanical seal cavity.
Description
Technical field
The present invention relates to a kind of freezing mixture drain tank pump that is used for nuclear reactor.
Background technique
The function of reactor coolant drain tank pump (abbreviation main pump) is to make freezing mixture form forced circulation, thereby is sent to steam generator to the heat energy that produces in the reactor, to produce steam, the driving steam turbine acting.Basic demand to it is:
1) can under the unmanned maintenance condition, work safely and reliably for a long time; Be convenient to maintenance, auxiliary system is simple;
2) Runner assembly should be able to provide enough rotary inertias, so that under the station blackout situation, utilizes the running down of main pump that enough flows are provided, and makes reactor core obtain suitable cooling;
3) to lack with the leakage rate of radioactive freezing mixture.
In the AP1000 project, the installing space of equipment is fixed, and therefore, nuclear power plant reactor freezing mixture drain tank pump must be a kind of compact structure and function can satisfy the vertical pump of technical parameter requirement.
Summary of the invention
The objective of the invention is in order to overcome the deficiency of existing technology, a kind of freezing mixture drain tank pump that is used for nuclear reactor is provided, it can reduce the axial dimension of pump greatly, makes that pump group structure is more compact.
The technological scheme that realizes above-mentioned purpose is: a kind of freezing mixture drain tank pump that is used for nuclear reactor; Comprise stator component, rotor part, bearing part, machine seal apparatus and machine envelope flushing line; Said stator component comprises pump cover, the pump housing, connecting tube, base plate, support, the motor frame that connects successively from bottom to top; Said rotor part comprises pump shaft, impeller and locking nut, wherein
Suction port on the said pump cover is for axially offering;
The said pump housing comprises the pumping chamber of lower end, the closed chamber at middle part and the bearing chamber of upper end, and the lower end mouth of said pumping chamber is coaxial with the suction port on the said pump cover and be communicated with, and exhaust port is radially offered in the side of said pumping chamber;
The upper end of said base plate also connects one and is positioned at the central machine sealing chamber body of said support, is provided with the injection stream and discharge stream of sparge water in this machine sealing chamber body;
The upper end of said support also connects one successively and is positioned at the central bearing support of said motor frame;
Said rotor part also comprises lock screw, and the bottom of the outer circumferential face of said pump shaft is provided with keyway section and thread section successively, and the lower end surface of said pump shaft also is provided with a tapped blind hole coaxial with pump shaft; Said impeller radially is fixed on the keyway section of pump shaft and is arranged in the pumping chamber of the said pump housing through key; Said impeller nut is threaded on the thread section of said pump shaft and with impeller and is axially fixed on the pump shaft; Said impeller nut is the covering cap shape nut, and the surperficial central authorities of the block of impeller nut offer a through hole; Said lock screw passes the through hole of said impeller nut and through in the tapped blind hole that is threaded in said pump shaft;
Said bearing part comprises upper end bearing and bottom end bearing, and said upper end bearing is a pair of angular contact ball bearing and leans against in the inner chamber that is installed in said bearing support privately; Said bottom end bearing is a guide bearing and is installed in the bearing chamber of the said pump housing, and this guide bearing is inlaid in the slide bushing in the inner chamber of metal-coating with comprising metal-coating and interference fit, and the material of said slide bushing is an engineering rubber;
Said machine encapsulation is changed to the unit loading type double mechanical seal and is installed in the said machine sealing chamber body;
Said machine envelope flushing line comprises that one is connected between exhaust port and the said base plate of pumping chamber of the said pump housing and the outlet pipe, parallel with said connecting tube is connected the cleaning hose between outlet pipe and the said machine sealing chamber body and is located at the injection stream and the discharge stream of the sparge water in the machine sealing chamber body.
The above-mentioned freezing mixture drain tank pump that is used for nuclear reactor; Wherein, Said machine seal apparatus comprises machine envelope axle sleeve, a pair of stationary ring, a rotating seat, a pair of rotating ring and a pair of spring; Said machine sealing chamber body is made up of lower chamber and upper cavity, and said lower chamber is fastened between the upper-end surface of base plate inner chamber and base plate of said pump, and said upper cavity is fastened on the upper-end surface of said lower chamber; Said machine envelope axle sleeve is sleeved on through Cock screw on the pump shaft that is positioned at said machine sealing chamber, and the outer circumferential face of this machine envelope axle sleeve is the stepped shaft cylndrical surface that two diameter is little, mid diameter is big; Space between the outer circumferential face of the inner chamber of said machine sealing chamber body and said machine envelope axle sleeve forms machine sealing chamber; Said a pair of stationary ring is fixed on the bottom of said lower chamber and the top of upper cavity through locating stud respectively; Said rotating seat is fixed on the said machine envelope axle sleeve through lock screw and is positioned at the middle part of said machine sealing chamber, and the longitudinal section of this rotating seat is H shape; Said a pair of rotating ring can be inlaid between two up and down and machine envelope axle sleeve of said rotating seat, so that said rotating ring rotates with said pump shaft with moving axially respectively; Said a pair of spring is separately positioned between a pair of rotating ring and the said rotating seat, so that the opposing side of said rotating ring and stationary ring is fitted all the time slidably.
The above-mentioned freezing mixture drain tank pump that is used for nuclear reactor; Wherein, The water inlet of said injection stream is positioned at the top of the outer circumferential face of said machine sealing chamber body, and the water outlet that injects stream is positioned at the bottom of said machine sealing chamber body inner peripheral surface, and said outlet pipe is connected with the water inlet of said injection stream; The drain opening of said discharge stream is positioned at the top of the inner peripheral surface of said machine sealing chamber body, and the backwater mouth of discharging stream is positioned on the lower end surface of said machine sealing chamber body.
The above-mentioned freezing mixture drain tank pump that is used for nuclear reactor, wherein, the upper end of the metal-coating of said bottom end bearing has cover plate, is provided with some mounting holes on this cover plate in uniform way.
The above-mentioned freezing mixture drain tank pump that is used for nuclear reactor; Wherein, Said freezing mixture drain tank pump is provided with the oil sealing mechanism of upper end bearing; This oil sealing mechanism comprises the bearing gland that is connected bearing support upper end and is installed in the outside framework oil seal in the Seal cage of said bearing support that the internal diameter of said bearing gland and the diameter of pump shaft are Spielpassung, and the labyrinth sealing groove is set on the inner peripheral surface of bearing gland; Said outside framework oil seal comprises L shaped metal frame, rubber body and spring ring; Said rubber body has the diapire and the cross section that encircle in interior ring, outer shroud and the connection with outer shroud and takes the shape of the letter U; Outer shroud and diapire are coated on the periphery of said metal frame; Interior ring is sealing lip, and said spring ring is installed on the outer circumferential face of said sealing lip.
The above-mentioned freezing mixture drain tank pump that is used for nuclear reactor, wherein, the gap between the internal diameter of said bearing gland and the diameter of said pump shaft is 0.24～0.26mm.
The above-mentioned freezing mixture drain tank pump that is used for nuclear reactor, wherein, the through hole on the said impeller nut is against on the step surface of this shoulder hole the spiral shell head of said lock screw for going up little one-level shoulder hole down greatly.
The above-mentioned freezing mixture drain tank pump that is used for nuclear reactor; Wherein, Said cleaning hose and said outlet pipe through one be fixed on said base plate upper end the water outlet connection part is connected, this water outlet connection part comprises that outlet port that one section short tube, coaxial with said outlet pipe and that offer an outlet is connected short tube and exports, two are connected to that the flange and at two ends is connected the blind flange on the upper flanges about the short tube.
The above-mentioned freezing mixture drain tank pump that is used for nuclear reactor wherein, is provided with some radiated ribs in uniform way on the outer surface of said bearing support.
The above-mentioned freezing mixture drain tank pump that is used for nuclear reactor, wherein, the quantity of said radiated rib is three to five, the thickness of said radiated rib is 8～12mm.
The technological scheme that is used for the freezing mixture drain tank pump of nuclear reactor of the present invention, adopting liquid is the structure that axially sucks, radially discharges, and can satisfy the size requirement of system to freezing mixture drain tank pump.The Natural Heat Convection mode is adopted in the bearing heat radiation, promptly is provided with the Natural Heat Convection fin on the surface of bearing support, can guarantee the Natural Heat Convection area, can also shorten the axial dimension of bearing support, makes pump structure more compact.In addition, the flushing of machine envelope is adopted from flushing, promptly adopts water inlet down, upper water-out flushing scheme, draws sparge water to the machine envelope in the outlet of the pump housing, can effectively play the effect of flushing, heat radiation.The axial force transmission of entire pump is steady, can effectively guarantee the safe operation of pump group.The freezing mixture drain tank pump structure that is used for nuclear reactor of the present invention is simple, outside sparge water need be provided; Pump group sealability is reliable, long service life; Satisfy the strict demand of AP1000.
Description of drawings
Fig. 1 is the freezing mixture drain tank pump structure schematic representation that is used for nuclear reactor of the present invention;
Fig. 2 is the structural representation that is used for the freezing mixture drain tank pump rotor parts of nuclear reactor of the present invention;
Fig. 3 is the structural representation that is used for the freezing mixture drain tank pump middle (center) bearing parts of nuclear reactor of the present invention;
Fig. 4 is the structural representation that is used for the freezing mixture drain tank pump oil sealing mechanism of nuclear reactor of the present invention;
Fig. 5 is the structural representation that is used for the freezing mixture drain tank pump machine seal apparatus of nuclear reactor of the present invention;
Fig. 6 is the structural representation that is used for the freezing mixture drain tank pump flushing line of nuclear reactor 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, a kind of freezing mixture drain tank pump that is used for nuclear reactor of the present invention comprises stator component, rotor part, bearing part, oil sealing mechanism, machine seal apparatus and machine envelope flushing line.
Stator component comprises pump cover 11, the pump housing 12, connecting tube 13, base plate 14, support 15, motor frame 16, machine sealing chamber body 17 and the bearing support 18 that connects successively from bottom to top, wherein:
The pump housing 12 comprises the pumping chamber of lower end, the closed chamber at middle part and the bearing chamber of upper end, and suction port on the lower end mouth of pumping chamber and the pump cover 11 110 is coaxial and be communicated with, and an exhaust port 120 is radially offered in the side of pumping chamber;
Machine sealing chamber body 17 is connected the upper end of base plate 14 and is positioned at the central authorities of support 15; This machine sealing chamber body 17 adopts segmentation structure; Promptly constitute by lower chamber 171 and upper cavity 172; Lower chamber 171 is fastened between the upper-end surface of base plate 14 inner chambers and base plate 14 of pump, and the upper-end surface of lower chamber 171 is a ladder surface, and the lower end surface of upper cavity 172 is the adaptive ladder surface of lower chamber 171; So that upper cavity 172 is fastened on the upper-end surface of lower chamber 171, upper cavity 172 engages the back through being bolted on the base plate 14 with lower chamber 171; Be provided with O-ring seals between lower chamber 171 and the base plate 14, be used to prevent that dielectric leakage from arriving air side; Be provided with some O-ring seals between upper cavity 172 and the lower chamber 171, be used to guarantee their sealings between the two;
Bearing support 18 is connected the upper end of support 15 and is positioned at the central authorities of motor frame 16, and the inner chamber of this bearing support 18 comprises bearing bore and the oil sealing chamber of bottom and the big up and small down one-level stepped shaft cylindrical cavity on top; Be provided with many radiated ribs 180 on the outer surface of bearing support 18 in uniform way, the thickness of radiated rib 180 is preferably 10mm, and the quantity of radiated rib 180 is preferably four, and heat can better be discharged, and can also improve the intensity and the rigidity of bearing support 18.
See also Fig. 2 again, rotor part comprises pump shaft 20, impeller 21, impeller nut 22 and lock screw 23, wherein:
The bottom of the outer circumferential face of pump shaft 20 is provided with keyway section and thread section successively, and the lower end surface of pump shaft 20 also is provided with a tapped blind hole coaxial with pump shaft 20;
Hexagonal spiral shell head screw in lock screw 23 adopts; It passes the through hole of impeller nut 22 and through in the tapped blind hole that is threaded in pump shaft 20; The spiral shell head 230 of lock screw 23 is against on the step surface of stepped shaft through hole of impeller nut 22; The spiral shell head 230 of lock screw 23 does not expose the surface of the block of impeller nut 22, can drop to minimumly to medium in the flow interfering of the entrance point of pump, can not influence hydraulic performance.
See also Fig. 3 again, bearing part upper end bearing 31 and bottom end bearing 32, wherein:
Upper end bearing 31 is used for the axial force of bear rotor parts; This upper end bearing 31 is made up of a pair of angular contact ball bearing; This a pair of angular contact ball bearing leans against the bearing bore that is installed on the pump shaft 20 privately and is arranged in bearing support 17, and this a pair of angular contact ball bearing is fastening through locking nut 310;
Bottom end bearing 32 is used for the radial force of bear rotor parts, and this bottom end bearing 32 is a guide bearing and is installed in the bearing chamber of the pump housing 12, this bottom end bearing 32 be a guide bearing and Spielpassung be installed on the axle sleeve 33; This guide bearing comprises metal-coating 321 and slide bushing 322; The material of this slide bushing 322 be engineering rubber and interference fit be inlaid in the inner chamber of metal-coating 321; The upper end of metal-coating 321 has cover plate, is provided with some mounting holes on this cover plate in uniform way, and this guide bearing is fixed on the pump housing 12 through some screws 320.
Gap between the external diameter of internal diameter and axle sleeve 33 through control slide bushing 322; Can control the amplitude that radially wobble of rotor part in the moment that starts and shut down; And then can dwindle the gap between impeller 21 and the seal ring 121; Reduce the wearing and tearing of seal ring 121, make seal ring 121 obtain the longer life-span and reduce the leakage rate of pumping chamber.
In the bearing part of the present invention, because the slide bushing 322 of guide bearing is the WR300 engineering rubber that adopts U.S. Greene Tweed company, this material is that a kind of long carbon fiber adds polyether-ether-ketone resin to strengthen pressing mold made.Polyether-ether-ketone resin has added intensity, stability and the thermal diffusivity of having strengthened material behind the long carbon fiber; And the thermoplastic engineering plastic that has surmounted other kind; The wear resistance of slide bushing 42 is strengthened; Pump is in operation can not take place seize to cause the phenomenon of pump shaft fracture, but bearing radial force well.Guide bearing also adopts the branch body structure, after slide bushing 322 wearing and tearing, can be convenient for changing.Adopt a pair of angular contact ball bearing of installing back-to-back as the upper end bearing, axial force that can the bear rotor parts can make the designs simplification of pump group.Because guide bearing can not bear whole radial forces sometimes, the upper end bearing can also bear remaining radial force.Axle sleeve 33 also can avoid pump shaft 20 directly relative with guide bearing in addition, plays the effect of protection pump shaft 20.
The axial force of entire pump is delivered to bearing support 18 by pump shaft 20 and upper end bearing 31, is born by base plate 14, ground at last.The transmission of power is steady.Can effectively guarantee the safe operation of pump group.
Upper end bearing 31 also is provided with oil sealing mechanism, and this oil sealing mechanism comprises bearing gland 33 and outside framework oil seal 34, wherein:
See also Fig. 4 again; Outside framework oil seal 34 is installed in the oil sealing chamber of bearing support 18; This outside framework oil seal 34 comprises L shaped metal frame (not shown), rubber body 341 and spring ring 342; The material of rubber body 341 is radiotolerant ethylene propylene diene rubber, in rubber body 341 has ring 343, outer shroud 344 and connect in the diapire and the cross section of ring 343 and outer shroud 344 take the shape of the letter U, outer shroud 344 and diapire are coated on the periphery of metal frame; Interior ring 343 tilts to the inside and as sealing lip, spring ring 342 is installed on the outer circumferential face of sealing lip.
When temperature raises; The thinning one side of lubricating grease meeting in the bearing bore produces axial flow and drains in the machine seal apparatus, can overflow bearing gland 33 owing to pressure on the other hand, through the mazy type maze trough 341 tortuous circuitous gaps of bearing gland 33; Because multichannel is multiple to be stopped, reduces pressure; Leakage rate is effectively suppressed, and leakage rate is minimum, has effectively guaranteed the normal use of upper end bearing 31.And external dust and other impurities will be passed through equally through the multiple of labyrinth sealing groove 341 on the bearing gland 33 and stopped, the trend that has stoped dust and other impurities to get into bearing bore.And be installed in the Seal cage of bearing support 18 outside framework oil seal 34 since sealing lip be arranged to hypotenuse and spring ring 342 effects on the sealing lip arranged; Make sealing lip can be fitted on the pump shaft 20 fully; Can prevent in the bearing bore of bearing support 18 dielectric leakage with separate the outer dirt of bearing bore; Dust, water and impurity are invaded.The outside framework oil seal outer layer rubber has the effect of anti-pressure and abrasion-proof, anti-oil and water most, longer service life, and the wearing and tearing of minimizing and pump shaft 20 reduce the wastage.Metal frame in this outside framework oil seal plays the setting effect, and rubber body is worn out, and the metal frame through in rubber, being provided with, and has slowed down the deformation time of rubber body.
See also Fig. 5 again, the machine encapsulation is changed to the unit loading type double mechanical seal and is installed in the machine sealing chamber body 17; The machine seal apparatus comprises machine envelope axle sleeve 40, a pair of stationary ring 41,42, a rotating seat 43, a pair of rotating ring 44,45 and a pair of spring 46,47, wherein:
Machine envelope axle sleeve 40 is sleeved on through Cock screw 400 on the pump shaft 20 that is positioned at machine sealing chamber body 17, and the outer circumferential face of this machine envelope axle sleeve 40 is the stepped shaft cylndrical surface that two diameter is little, mid diameter is big, can reduce the size of mechanical seal like this, saves cost;
Space between the outer circumferential face of the inner chamber of machine sealing chamber body 17 and machine envelope axle sleeve 40 forms machine sealing chamber;
A pair of stationary ring 41,42 is fixed on the bottom of machine sealing chamber body 17 and the top of machine sealing chamber body 17 through locating stud 411 and O-ring seals 412 respectively;
Rotating seat 43 is fixed on the machine envelope axle sleeve 40 through lock screw 430 and is positioned at the middle part of machine sealing chamber, and the longitudinal section of this rotating seat 43 is H shape;
A pair of rotating ring 44,45 can be inlaid between two up and down and machine envelope axle sleeve 40 of rotating seat 43, to rotate with pump shaft 20 through O-ring seals 423 respectively with moving axially;
A pair of spring 46,47 is separately positioned between a pair of rotating ring 44,45 and the rotating seat 43, so that the opposing side of rotating ring 44,45 and stationary ring 41,42 is fitted all the time slidably.
Be provided with O-ring seals 420 between the bottom of machine envelope axle sleeve 40 and the pump shaft 20, be used to stop the clearance leakage of medium along pump shaft 8 and mechanical seal.
The working principle of the mechanical seal of startup feed water pump of the present invention is: the leakage of sealing gas, and can adapt to dried the startup, and after operation for the first time, being filled with medium in the machine sealing chamber, later startup all belongs to has lubricated startup.Afterwards in the pump operation process; When medium arrives mechanical seal along pump shaft 20 is mobile from bottom to top; By 420,470 blocking-up of O type circle; Meeting forms to be full of and has the certain pressure fed sheet of a media in machine sealing chamber, because the both ends of the surface area that rotating ring 44,45 is stressed does not wait, can form the impacting force to stationary ring 41,42; And rotating ring 44,45 through spring 46,47 make rotating ring 44,45 and stationary ring 41, the opposing side appropriateness that forms between 42 fits, and keeps the purpose that one deck liquid film as thin as a wafer reaches sealing between this faying surface thereby make.
See also Fig. 6 again, machine seals injection stream 53 and the discharge stream 54 that flushing line comprises outlet pipe 51, cleaning hose 52 and is located at the sparge water in the machine sealing chamber body 17, wherein:
One end of cleaning hose 52 is connected with outlet pipe 51 on the base plate 14 through flange, and the other end is connected with the water inlet 531 of the injection stream 53 of machine sealing chamber body 17;
The water inlet 531 that injects stream 53 is positioned at the top of the outer circumferential face of machine sealing chamber body 17, and the water outlet 532 that injects stream 53 is positioned at the bottom of machine sealing chamber body 17 inner peripheral surfaces;
The drain opening 541 of discharging stream 54 is positioned at the top of the inner peripheral surface of machine sealing chamber body 17, and the backwater mouth 542 of discharging stream 54 is positioned on the lower end surface of machine sealing chamber body 17.
Machine seal apparatus of the present invention adopts PLAN11 from the flushing scheme, from the exhaust port 120 introduction machines envelope sparge water of pump, and in bottom's water inlet of machine sealing chamber body 17, the top water outlet, this can make the machine seal apparatus washed fully and cool off.Because the medium temperature that this pump is carried is 10 ℃～121.1 ℃, the cleaning hose 52 in the flushing line adopts fin tube, can effectively increase heat diffusion area in addition.Backwater mouth 542 is positioned on the lower end surface of machine sealing chamber body 17 and can be communicated with connecting tube 13, and sparge water is flowed back in the jar, efficiently solves the sealing difficulty of bringing because of external flushing line.
Those of ordinary skill in the art will be appreciated that; Above embodiment is used for explaining the present invention; And be not with opposing 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 (10)
1. freezing mixture drain tank pump that is used for nuclear reactor; Comprise stator component, rotor part, bearing part, machine seal apparatus and machine envelope flushing line; Said stator component comprises pump cover, the pump housing, connecting tube, base plate, support, the motor frame that connects successively from bottom to top; Said rotor part comprises pump shaft, impeller and locking nut, it is characterized in that
Suction port on the said pump cover is for axially offering;
The said pump housing comprises the pumping chamber of lower end, the closed chamber at middle part and the bearing chamber of upper end, and the lower end mouth of said pumping chamber is coaxial with the suction port on the said pump cover and be communicated with, and exhaust port is radially offered in the side of said pumping chamber;
The upper end of said base plate also connects one and is positioned at the central machine sealing chamber body of said support, is provided with the injection stream and discharge stream of sparge water in this machine sealing chamber body;
The upper end of said support also connects one successively and is positioned at the central bearing support of said motor frame;
Said rotor part also comprises lock screw, and the bottom of the outer circumferential face of said pump shaft is provided with keyway section and thread section successively, and the lower end surface of said pump shaft also is provided with a tapped blind hole coaxial with pump shaft; Said impeller radially is fixed on the keyway section of pump shaft and is arranged in the pumping chamber of the said pump housing through key; Said impeller nut is threaded on the thread section of said pump shaft and with impeller and is axially fixed on the pump shaft; Said impeller nut is the covering cap shape nut, and the surperficial central authorities of the block of impeller nut offer a through hole; Said lock screw passes the through hole of said impeller nut and through in the tapped blind hole that is threaded in said pump shaft;
Said bearing part comprises upper end bearing and bottom end bearing, and said upper end bearing is a pair of angular contact ball bearing and leans against in the inner chamber that is installed in said bearing support privately; Said bottom end bearing is a guide bearing and is installed in the bearing chamber of the said pump housing, and this guide bearing is inlaid in the slide bushing in the inner chamber of metal-coating with comprising metal-coating and interference fit, and the material of said slide bushing is an engineering rubber;
Said machine encapsulation is changed to the unit loading type double mechanical seal and is installed in the said machine sealing chamber body;
Said machine envelope flushing line comprises that one is connected between exhaust port and the said base plate of pumping chamber of the said pump housing and the outlet pipe, parallel with said connecting tube is connected the cleaning hose between outlet pipe and the said machine sealing chamber body and is located at the injection stream and the discharge stream of the sparge water in the machine sealing chamber body.
2. the freezing mixture drain tank pump that is used for nuclear reactor according to claim 1 is characterized in that, said machine seal apparatus comprises machine envelope axle sleeve, a pair of stationary ring, a rotating seat, a pair of rotating ring and a pair of spring,
Said machine sealing chamber body is made up of lower chamber and upper cavity, and said lower chamber is fastened between the upper-end surface of base plate inner chamber and base plate of said pump, and said upper cavity is fastened on the upper-end surface of said lower chamber;
Said machine envelope axle sleeve is sleeved on through Cock screw on the pump shaft that is positioned at said machine sealing chamber, and the outer circumferential face of this machine envelope axle sleeve is the stepped shaft cylndrical surface that two diameter is little, mid diameter is big;
Space between the outer circumferential face of the inner chamber of said machine sealing chamber body and said machine envelope axle sleeve forms machine sealing chamber;
Said a pair of stationary ring is fixed on the bottom of said lower chamber and the top of upper cavity through locating stud respectively;
Said rotating seat is fixed on the said machine envelope axle sleeve through lock screw and is positioned at the middle part of said machine sealing chamber, and the longitudinal section of this rotating seat is H shape;
Said a pair of rotating ring can be inlaid between two up and down and machine envelope axle sleeve of said rotating seat, so that said rotating ring rotates with said pump shaft with moving axially respectively;
Said a pair of spring is separately positioned between a pair of rotating ring and the said rotating seat, so that the opposing side of said rotating ring and stationary ring is fitted all the time slidably.
3. the freezing mixture drain tank pump that is used for nuclear reactor according to claim 1; It is characterized in that; The water inlet of said injection stream is positioned at the top of the outer circumferential face of said machine sealing chamber body; The water outlet that injects stream is positioned at the bottom of said machine sealing chamber body inner peripheral surface, and said outlet pipe is connected with the water inlet of said injection stream; The drain opening of said discharge stream is positioned at the top of the inner peripheral surface of said machine sealing chamber body, and the backwater mouth of discharging stream is positioned on the lower end surface of said machine sealing chamber body.
4. the freezing mixture drain tank pump that is used for nuclear reactor according to claim 1 is characterized in that the upper end of the metal-coating of said bottom end bearing has cover plate, is provided with some mounting holes on this cover plate in uniform way.
5. the freezing mixture drain tank pump that is used for nuclear reactor according to claim 1; It is characterized in that; Said freezing mixture drain tank pump is provided with the oil sealing mechanism of upper end bearing; This oil sealing mechanism comprises the bearing gland that is connected bearing support upper end and is installed in the outside framework oil seal in the Seal cage of said bearing support
The internal diameter of said bearing gland and the diameter of pump shaft are Spielpassung, and the labyrinth sealing groove is set on the inner peripheral surface of bearing gland;
Said outside framework oil seal comprises L shaped metal frame, rubber body and spring ring; Said rubber body has the diapire and the cross section that encircle in interior ring, outer shroud and the connection with outer shroud and takes the shape of the letter U; Outer shroud and diapire are coated on the periphery of said metal frame; Interior ring is sealing lip, and said spring ring is installed on the outer circumferential face of said sealing lip.
6. the freezing mixture drain tank pump that is used for nuclear reactor according to claim 5 is characterized in that the gap between the internal diameter of said bearing gland and the diameter of said pump shaft is 0.24～0.26mm.
7. the freezing mixture drain tank pump that is used for nuclear reactor according to claim 1 is characterized in that, the through hole on the said impeller nut is against on the step surface of this shoulder hole the spiral shell head of said lock screw for going up little one-level shoulder hole down greatly.
8. the freezing mixture drain tank pump that is used for nuclear reactor according to claim 1; It is characterized in that; Said cleaning hose and said outlet pipe through one be fixed on said base plate upper end the water outlet connection part is connected, this water outlet connection part comprises that outlet port that one section short tube, coaxial with said outlet pipe and that offer an outlet is connected short tube and exports, two are connected to that the flange and at two ends is connected the blind flange on the upper flanges about the short tube.
9. the freezing mixture drain tank pump that is used for nuclear reactor according to claim 1 is characterized in that, is provided with some radiated ribs on the outer surface of said bearing support in uniform way.
10. the freezing mixture drain tank pump that is used for nuclear reactor according to claim 9 is characterized in that the quantity of said radiated rib is three to five, and the thickness of said radiated rib is 8～12mm.
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| CN201210083330.2A CN102606536B (en) | 2012-03-27 | 2012-03-27 | Coolant drain tank pump for nuclear reactor |
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| CN201210083330.2A CN102606536B (en) | 2012-03-27 | 2012-03-27 | Coolant drain tank pump for nuclear reactor |
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| CN102606536A true CN102606536A (en) | 2012-07-25 |
| CN102606536B CN102606536B (en) | 2014-04-09 |
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| CN103671229A (en) * | 2013-12-09 | 2014-03-26 | 无锡艾比德泵业有限公司 | Centrifugal pump with improved mechanical seal cooling structure |
| CN103727072A (en) * | 2013-12-31 | 2014-04-16 | 江苏大学 | Impurity pump machine sealing flushing and bearing cooling device |
| CN106762703A (en) * | 2016-12-29 | 2017-05-31 | 镇江福泰克流体技术有限公司 | A kind of upright type liquid discharge centrifugal pump |
| CN108799145A (en) * | 2018-07-11 | 2018-11-13 | 合肥凯泉电机电泵有限公司 | A kind of high-efficiency mixed flow pump of the certainly cooling submersible motor of band |
| CN109968239A (en) * | 2019-03-21 | 2019-07-05 | 哈尔滨电气动力装备有限公司 | The process that four bearing axle envelope main pump of nuclear power station centering block size is prepared |
| CN110145469A (en) * | 2019-06-05 | 2019-08-20 | 广州市昕恒泵业制造有限公司 | Environmentally friendly and reliable pumps for water treatment systems |
| CN112796991A (en) * | 2021-03-17 | 2021-05-14 | 艺达思科技（苏州）有限公司 | gear pump |
| CN115788971A (en) * | 2022-11-21 | 2023-03-14 | 中国航发四川燃气涡轮研究院 | Damping device for vertical rotary machine |
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| CN110145469A (en) * | 2019-06-05 | 2019-08-20 | 广州市昕恒泵业制造有限公司 | Environmentally friendly and reliable pumps for water treatment systems |
| CN112796991A (en) * | 2021-03-17 | 2021-05-14 | 艺达思科技（苏州）有限公司 | gear pump |
| CN115788971A (en) * | 2022-11-21 | 2023-03-14 | 中国航发四川燃气涡轮研究院 | Damping device for vertical rotary machine |
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