CN102606534A

CN102606534A - Waste heat discharge pump for nuclear power plant

Info

Publication number: CN102606534A
Application number: CN2012100832390A
Authority: CN
Inventors: 陆金琪; 毛钰秋
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: WO2013143448A1

Abstract

The invention discloses a waste heat discharge pump for a nuclear power plant, which comprises a stator component, a rotor component, a bearing component and a shaft seal device. The stator component comprises a pump casing, guide vanes arranged in the cavity of the pump casing, a pump cover connected at the front end of the pump casing and a sealing box body connected at the front end of the pump cover. The rotor component comprises a pump shaft and vane wheels sleeved on the pump shaft through vane wheel nuts and located in the cavities of the guide vanes. The bearing component comprises a bearing body, bearing pressing covers, a driving end bearing and a non-driving end bearing, wherein the front portion and the rear portion of the bearing body are respectively provided with bearing cavities, the bearing pressing covers are covered at two ends of the bearing body, and the driving end bearing and the non-driving end bearing are arranged in the bearing cavities one by one. The shaft seal device is a containerization balanced type single end face mechanical seal and is arranged in the cavity of the sealing box body. The rotor component further comprises a retainer gasket which is arranged between the vane wheel nuts and the vane wheels in a mode that a tongue piece of the retainer gasket is covered on the planes of the vane wheel nuts. The bearing component further comprises a cooling water jacket and a cooling water pipeline, and a bearing protector is respectively arranged in cavities of the bearing pressing cover at two ends.

Description

A kind of used in nuclear power station residual heat removal pump

Technical field

The present invention relates to a kind of used in nuclear power station residual heat removal pump.

Background technique

It is horizontal, single-stage, single suction, cantilever type centrifugal pump that present million kilowatt pressurized-water reactor nuclear power plant uses the structural type of residual heat removal pump, and the major function of this pump is: discharge reactor core waste heat, discharge a loop and equipment sensible heat, discharge the heat that main pump produces.

The diameter of the maximum cylindrical of the impeller nut of existing million kilowatt pressurized-water reactor nuclear power plant residual heat removal pump is 102mm; The external diameter of back shroud of impeller entrance point is 113mm; Be the external diameter little 11mm of the maximum outside diameter of impeller nut than back shroud of impeller entrance point; The disk that receives extra 11mm with regard to the feasible liquid that gets into impeller like this stops and loses part energy, the efficient of pump is significantly reduced.The counter-rotating situation appears in pump sometimes in addition, makes impeller nut loosening phenomenon occur, thereby has influenced the reliability and the Security of pump operation.

Only carry thermostatic medium owing to the medium of residual heat removal pump conveying and unlike other pump that kind, but carry the alternating temperature medium.The variation of medium temperature can make the inlet pressure of pump change; This has just caused the polytrope of pump axial force, and then makes the ball bearing that bears axial force receive extra load, produces bigger heat; Cause this pump generally to have the heating value of bearing big; Bearing life is short, maintenance is inconvenient, problems such as shock resistance difference, and there is short, phenomenon such as heat-resisting ability is poor, leakage rate is big in working life in gland seal device.

Existing solution residual heat removal pump all is employed in the method for opening several small through hole on the anti-drive end end face of bearing support to the destruction problem of bearing and lubricating grease at high-temperature steam under the LOCA environment.Though this method has solved the problem of above-mentioned existence, brought new trouble again, that be exactly under the LOCA environment high-temperature steam in the containment and condensed water get in bearing suppories through these several small through hole, thereby destroyed capability of lubricating grease.

Summary of the invention

The objective of the invention is in order to overcome the deficiency of existing technology; A kind of used in nuclear power station residual heat removal pump is provided; It can be good at satisfying each item requirement in the nuclear power station, and axial force is excessive when having solved nuclear power station residual heat removal pump conveying high temperature media, and the bearing heating amount is big; Maintenance is inconvenient, and high-temperature steam and issuable condensed water get into the problems such as destruction of bearing to lubricating grease under shock resistance difference and the LOCA environment.

The technological scheme that realizes above-mentioned purpose is: a kind of used in nuclear power station residual heat removal pump; Comprise stator component, rotor part, bearing part and gland seal device; Said stator component comprises pump case, be located at the stator of pump case inner chamber, be connected the pump cover of pump case front end and be connected the sealed letter body of pump cover front end, and said rotor part comprises pump shaft, is sleeved on the pump shaft and is positioned at the impeller of the inner chamber of said stator through impeller nut; Said bearing part comprise front and rear portions be respectively equipped with the bearing support of bearing bore, cover the bearing support two ends bearing gland, be arranged on the drive end bearing in the fore bearing chamber and be arranged on the non-driven-end bearing in the rear bearing chamber; Said gland seal device is located at the inner chamber of said sealed letter body; Wherein

The import of said pump case and the vertical setting of outlet, the inner chamber of this pump case is annular delivery chamber;

Be provided with preceding seal ring between the front shroud of said impeller and the said stator, be provided with increasing back sealing ring between the back shroud of said impeller and the said pump cover, the internal diameter of said preceding seal ring is greater than the internal diameter of said increasing back sealing ring;

Said impeller nut comprises hexagon head and is connected the lid formula nut body of hexagon head rear end; The outer surface of nut body is pre-small post-large conical surface; The maximum outside diameter of this nut body equates with the external diameter of the entrance point of the back shroud of said impeller, on the outer surface of impeller nut, axially cuts a plane;

Said rotor part also comprises a locked spacer; This locked spacer comprises a circular ring plate and is vertically connected on the front-end face of circular ring plate and is positioned at the tongue piece of annulus inner headed face; The outside diameter of this circular ring plate equates with the maximum outside diameter of said nut body, and the mode that said locked spacer overlays on its tongue piece on the plane of said impeller nut is arranged between impeller nut and the impeller;

Said bearing part comprises and also comprises cooling jacket and cooling water pipeline; The outer surface of said bearing support compartment of terrain vertically is provided with the hollow toroid tank of some connections; Said cooling jacket is sleeved on the outside of said bearing support, makes the inwall of said tank and cooling jacket constitute cooling water chamber; Said cooling water pipeline is communicated with said cooling water chamber and forms circulating water loop;

The inner chamber of said bearing gland is provided with a bearing protector respectively;

Said gland seal device is the single mechanical end face seal of unit loading type balance type.

Above-mentioned used in nuclear power station residual heat removal pump, said bearing protector comprises rotor cover, stator cover, cutter and exciter, wherein,

The ear end face of said rotor cover is provided with low inside and high outside step type maze trough, and the interior edge face and the said pump shaft of this rotor cover are interference fit, and this rotor cover is fixed on the said pump shaft through rotor cover seal ring;

Low outer high step type maze trough in the front-end face of said stator cover is provided with; The exterior edge face of this stator cover and the inner cavity surface of said bearing gland are interference fit; The interior edge face and the said pump shaft of this stator cover are Spielpassung; This stator cover mode in the maze trough of said rotor cover of being embedded in gap with the cell wall of its maze trough is positioned at the rear portion of said rotor cover and is fixed on the said bearing gland through stator cover seal ring, makes the maze trough of said stator cover and the maze trough of said rotor cover constitute tortuous sealing channel;

Said cutter and exciter all are located in the said sealing channel; And when said pump shaft was static, said exciter and said cutter coincide and sealing channel are sealed; When said pump shaft rotated, said exciter separated with said cutter and sealing channel is opened;

Above-mentioned used in nuclear power station residual heat removal pump, said gland seal device comprise machine envelope axle sleeve, pump efficiency ring, machine sealed cover, rotating ring, stationary seat, stationary ring, some springs, restrictor ring and baffle plate, wherein,

The rear portion of the outer surface of said machine envelope axle sleeve is three grades of pre-small post-large ladder surfaces, and this machine envelope axle sleeve is fixed on the said pump shaft;

Said pump efficiency ring is sleeved on the maximum periphery of said machine envelope axle sleeve;

Said machine sealed cover comprises that one is positioned at the flange at middle part and is connected the sleeve on the flange ear end face; The front-end face of this machine sealed cover is provided with a pit; The ear end face of said flange is offered some blind holes and tapped blind hole in uniform way, and this machine sealed cover is sleeved on outer surface anterior of said machine envelope axle sleeve and is fixed on the front-end face of said sealed letter body in the mode of the outer surface of said pump efficiency ring with its sleeve set;

Said rotating ring is installed between the second level step surface and third level step surface of said machine envelope axle sleeve;

The middle part of the outer surface of said stationary seat is provided with a protruding dish, and the tapped blind hole on this protruding dish on the corresponding said machine sealed cover is offered pin-and-hole, and this stationary seat can be sleeved on the middle part of machine envelope axle sleeve with moving axially and be connected on the ear end face of flange of said machine sealed cover;

Said stationary ring be sleeved on said stationary seat outer surface the rear portion and be connected on the ear end face of protruding dish of said stationary seat;

Said some springs are placed in the blind hole of said machine sealed cover 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 restrictor ring is located in the pit of said machine sealed cover;

Said baffle plate is connected on the front-end face of said machine sealed cover through positioning block.

Above-mentioned used in nuclear power station residual heat removal pump; Wherein, The width of tank that is positioned at said bearing support front and rear part is greater than the width of the tank that is positioned at said bearing support middle part; And be positioned at the width of the width of the anterior tank of said bearing support greater than the tank that is positioned at said bearing support rear portion, it is L-shaped to be positioned at the anterior tank of said bearing support.

Above-mentioned used in nuclear power station residual heat removal pump, wherein, the intake pipe of said cooling water pipeline is connected on the tank that is positioned at said bearing support rear portion, and the outlet pipe of said cooling water pipeline is connected and is positioned on the anterior tank of said bearing support.

Above-mentioned used in nuclear power station residual heat removal pump; Wherein, The maze trough that said stator puts has three roads, and the maze trough that said rotor puts has two roads, and the rear end of the interior edge face of said rotor cover also is provided with a step hole; The internal groove side wall of the interior road maze trough of said stator cover is embedded in the step hole of said rotor cover with gap, and said cutter and exciter all are located in the interior side line maze trough of said rotor cover.

Above-mentioned used in nuclear power station residual heat removal pump, wherein, the exterior edge face of the interior edge face of said stator cover and said rotor cover is respectively equipped with a hydrops groove.

Above-mentioned used in nuclear power station residual heat removal pump, wherein, said bearing protector also comprise one be located at the outer side line maze trough of said stator cover the middle part cell wall that overlaps of external groove sidevall and said rotor between the end face backplate.

Above-mentioned used in nuclear power station residual heat removal pump, wherein, said rotating ring radially is fixed on the said machine envelope axle sleeve through the step pin; Said stationary ring radially is fixed on the said stationary seat through the step pin; Said stationary seat is installed in through threaded on the ear end face of flange of said machine sealed cover.

Above-mentioned used in nuclear power station residual heat removal pump; Wherein, between said machine envelope axle sleeve and the said pump shaft, said rotating ring and said machine seals between the axle sleeve, between said stationary ring and the said stationary seat, between said stationary seat and the said machine sealed cover, between said restrictor ring and the said machine sealed cover O-ring seals is set respectively.

The technological scheme of used in nuclear power station residual heat removal pump of the present invention; Axial force is excessive when having solved nuclear power station residual heat removal pump conveying high temperature media; The bearing heating amount is big; Maintenance is inconvenient, and high-temperature steam and issuable condensed water get into the problems such as destruction of bearing to lubricating grease under shock resistance difference and the LOCA environment.

Description of drawings

Fig. 1 is the structural representation of used in nuclear power station residual heat removal pump of the present invention;

Fig. 2 a is the structural representation of impeller nut in the used in nuclear power station residual heat removal pump of the present invention;

Fig. 2 b is the side view of Fig. 2 a;

Fig. 3 a is the structural representation of locked spacer in the used in nuclear power station residual heat removal pump of the present invention;

Fig. 3 b is the side view of Fig. 3 a;

Fig. 4 is the enlarged view of the I part among Fig. 1;

Fig. 5 is the structural representation of used in nuclear power station residual heat removal pump middle (center) bearing parts of the present invention;

Fig. 6 is the structural representation of used in nuclear power station residual heat removal pump middle (center) bearing protector of the present invention;

Fig. 7 is the structural representation of gland seal device in the used in nuclear power station residual heat removal pump 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 used in nuclear power station residual heat removal pump of the present invention comprises stator component, rotor part, bearing part and gland seal device 5.

Stator component comprises pump case 1, be located at the stator 2 of pump case 1 inner chamber, be connected the pump cover 3 of pump case 1 front end and be connected the sealed letter body 17 of pump cover 4 front ends, wherein:

The import of pump case 1 and the vertical setting of outlet, the inner chamber of this pump case 1 is annular delivery chamber; Simple in structure and the bearing capacity of this pump case 1 is strong, thermal distortion is even, guarantees in the structural integrity of carrying under high temperature media and the seismic condition;

Weld pump case-outlet(discharge) flange pipe 3 on the outlet cylindrical of pump case 1, weld and do nondestructive inspection, avoid being used to mutually welding difficulty with nondestructive inspection by the RCC-M welding requirements;

Sealed letter body 17 is the parts that are used for equipped gland seal device; These parts and pump cover 4 are combined to form a heat shielding (cooling sandwith layer); External equipment cooling water on pump cover 4 reduces the temperature of Seal cage medium through the cooling to cooling sandwith layer, guarantees gland seal device operation steady in a long-term.

Rotor part comprises pump shaft 11, is sleeved on the pump shaft 11 and is positioned at impeller 19, impeller nut 20 and the locked spacer 23 of the inner chamber of stator 2 through impeller nut 20, wherein:

The head of pump shaft 11 is provided with thread section and keyway section successively;

Impeller 19 radially is fixed on through key on the keyway section of pump shaft 11, and impeller nut 20 spinnings are being axially fixed on the pump shaft 11 on the thread section of pump shaft 11 and with impeller 19;

Impeller comprises forward and backward cover plate 191,192; Seal ring 21 before being provided with between the front shroud of impeller 19 and the stator 2; Be provided with increasing back sealing ring 22 between the back shroud of impeller 19 and the pump cover 4; The internal diameter of preceding seal ring 21 makes pump shaft 11 generally be in tension state greater than the internal diameter of increasing back sealing ring 22, improves the rigidity of pump shaft 11; Solved pump when carrying high temperature media because the excessive problem of the excessive end thrust that causes of inlet pressure, guarantee to bear working life of angular contact ball bearing of the drive end of residual axial force;

See also Fig. 2 a and Fig. 2 b again; Impeller nut 20 comprises hexagon head 201 and is connected the lid formula nut body 202 of hexagon head 201 rear ends; Hexagon head 201 is used to make things convenient for rotary blade nut 3, and the outer surface of nut body 202 is pre-small post-large conical surface, and the maximum outside diameter D3 of this conical surface equates with the external diameter of the entrance point of the back shroud 192 of impeller 19; On the outer surface of nut body 202, axially cut a plane 203, the length L 1 on this plane 203 is 20～24mm;

See also Fig. 3 a and Fig. 3 b again; Locked spacer 23 comprises a circular ring plate 231 and is vertically connected on the front-end face of circular ring plate 231 and is positioned at the tongue piece 232 of the inner headed face of circular ring plate 231 that the outside diameter D4 of this circular ring plate 231 equates with the maximum outside diameter D3 of nut body 202; Width L2=9～the 11mm of tongue piece 232, the extrusion h=6 of tongue piece 232～8mm; The mode that this locked spacer 23 overlays on its tongue piece 232 on the plane 203 of impeller nut 20 is arranged on (see figure 4) between impeller nut 20 and the impeller 19.

The outward edge of the impeller nut 20 after improving and back shroud 192 entrance points of impeller 19 are smooth excessively; Make pumping liquid can not produce whirlpool in impeller 19 and impeller nut 20 position contacting; Make liquid can get into impeller 19 reposefully; Thereby increased substantially the efficient of pump; Between impeller nut 20 and impeller 19, locked spacer simple in structure, that stop property is strong 23 is set in addition, efficiently solves the loosening of impeller nut 20, thereby guaranteed residual heat removal pump reliability of operation and Security.

See also Fig. 5 again; Bearing part comprises that front and rear portions is respectively equipped with the bearing support 8 of a bearing bore, covers bearing gland 9, bearing protector 13, cooling jacket 7 and the cooling water pipeline at bearing support 8 two ends; Drive end bearing 14, non-driven-end bearing 16 and be connected the bearing support support 15 of fore bearing gland front end, wherein:

Drive end bearing 14 has two angular contact ball bearings and is contained in the fore bearing chamber of bearing support 8 through the internal and external partition ring, and non-driven-end bearing 16 is roller bearing and is installed in the rear bearing chamber of bearing support 8; The outer surface of bearing support 8 compartment of terrain vertically is provided with the hollow toroid tank of some connections, is positioned at tank 81, the 83 corresponding front and back bearings chamber respectively of the front and rear part of bearing support 8 outer surfaces; The tank 81 of front portion that is positioned at bearing support 8 is L-shaped; The width of

tank

81,83 that is positioned at bearing support 8 front and rear portions is greater than the width of the tank 82 that is positioned at bearing support 8 middle parts, and is positioned at the width of the width of the anterior tank 81 of said bearing support greater than the tank that is positioned at the bearing support rear portion 83;

Cooling jacket 7 is sleeved on the outside of bearing support 8, so that the inwall of

tank

81,82,83 and cooling jacket 7 constitutes cooling water chamber;

Cooling water pipeline is communicated with cooling water chamber and constitutes circulating water loop, and the intake pipe 71 of this cooling water pipeline is connected on the tank 83 that is positioned at bearing support 8 rear portions, and the outlet pipe 72 of cooling water pipeline is connected on the tank 81 that is positioned at bearing support 8 front portions.

Because

tank

81,83 width of offering at the outer surface and the corresponding forward and backward bearing bore of bearing support 8 are bigger; And because the heating value of drive end bearing 14 is big; And the tank 81 of correspondence is designed to L shaped, with enlarging cooling area, cooling water chamber is cooled off through external cooling water; Can take away the heat of drive end bearing 14 and non-driven-end bearing 16 generations effectively; Thereby reach the purpose that reduces bearing and grease temperature, thereby solved the big problem of used in nuclear power station residual heat removal pump bearing heating amount, guaranteed the service requirement reliably and with long-term of pump.

Bearing support 8, bearing gland 9 and cooling jacket 7 have been formed the support unit of residual heat removal pump, and carry out designing and calculating by RCC-M, the natural frequency of these parts satisfies the requirement greater than 33Hz, guaranteed pump between earthquake period and after structural integrity; Bearing support 8 is combined to form a cooling chamber with cooling jacket 7, and external cooling water cools off bearing and lubricant oil, guarantees the performability of residual heat removal pump under various operating modes.

See also Fig. 6 again, bearing protector 13 is located at the inner chamber of bearing gland 9, and this bearing protector 13 comprises rotor cover 131, stator cover 132, cutter 133, exciter 134 and end face backplate 135, wherein:

The ear end face of rotor cover 131 is provided with the low inside and high outside step type maze trough in two roads; And the rear end of its interior edge face also is provided with a step hole; The exterior edge face of rotor cover 131 is provided with a hydrops groove 130; Interior edge face and the pump shaft 11 of this rotor cover 131 be interference fit, and this rotor overlaps 131 through overlapping seal rings 136,137 and be fixed on the pump shaft 10 in that two rotors being set on the interior edge face;

The front-end face of stator cover 132 is provided with low outer high step type maze trough in three roads; The exterior edge face of this stator cover 132 and the inner cavity surface of bearing gland 9 are interference fit; The interior edge face of this stator cover 132 and pump shaft 11 are for Spielpassung and be provided with a hydrops groove 138; This stator cover 132 cell walls with its maze trough mode in the maze trough of rotor cover 131 of being embedded in gap is positioned at the rear portion of rotor cover 131; This stator cover 132 is through being fixed on the bearing gland 9 in that stator cover seal ring 139 is set on the exterior edge face, makes the maze trough of maze trough and the rotor cover 131 of stator cover 132 constitute tortuous sealing channel and be arranged in rotor and overlaps 131 side line maze trough;

Cutter 133 all is located in the sealing channel with exciter 134; And when pump shaft 11 was static, exciter 134 coincide with cutter 133 and sealing channel is sealed; When pump shaft 11 rotated, exciter 134 separated with cutter 133 owing to action of centrifugal force and sealing channel is opened.

External groove sidevall and the rotor that end face backplate 135 is located at the outer side line maze trough of stator cover 132 overlaps between 131 the middle part cell wall.

136,137 and stator covers of two rotor cover seal rings seal ring 139 is O-ring seals.

Because rotor cover 131 adopts two O shape circle interference fit to drive with pump shaft 11, thereby has exempted the wearing and tearing to pump shaft 11, has reduced maintenance or has changed the cost that pump shaft 11 brings; Front-end face at stator cover 132 axially is provided with maze trough; Ear end face at rotor cover 131 axially is provided with maze trough; And cutter 133 and exciter 134 be set in the indentation sealing channel that constitutes by rotor cover and stator cover, when pump shaft 11 was static, exciter 134 and cutter 133 were identical and sealing channel is sealed; Prevented the premature failure of bearing and lubricating grease, solved especially that high-temperature steam and issuable condensed water get into the destruction problem of bearing to lubricating grease under the LOCA environment; When pump shaft 11 rotated, exciter 134 separated with cutter 133 and sealing channel is opened, and made the ventilating performance of bearing good, good heat dissipation effect.

Gland seal device 5 is single mechanical end face seal of unit loading type balance type and the inner chamber that is located at sealed letter body 17.

See also Fig. 7 again, this gland seal device 5 comprises machine envelope axle sleeve 51, pump efficiency ring 52, machine sealed cover 53, rotating ring 54, stationary seat 55, stationary ring 56, some springs 57, restrictor ring 58 and baffle plate 59, wherein:

The rear portion of the outer surface of machine envelope axle sleeve 51 is three grades of pre-small post-large ladder surfaces, and this machine envelope axle sleeve 51 is fixed on the pump shaft 11;

Pump efficiency ring 52 is sleeved on the maximum periphery of machine envelope axle sleeve 51 and is fixed on the ear end face of machine envelope axle sleeve 51;

Machine sealed cover 53 comprises that one is positioned at the flange 531 at middle part and is connected the sleeve 532 on flange 531 ear end faces; The front-end face of this machine sealed cover 53 is provided with a pit; The ear end face of flange 31 is offered some blind holes and tapped blind hole in uniform way, and the mode that this machine sealed cover 43 is sleeved on the outer surface of pump efficiency ring 52 with its sleeve 532 is sleeved on outer surface anterior of machine envelope axle sleeve 51 and is fixed on the front-end face of sealed letter body 17;

Rotating ring 54 is installed between the second level step surface and third level step surface of machine envelope axle sleeve 51, and is connected on the third level step surface of machine envelope axle sleeve 51 through step pin 540;

The middle part of the outer surface of stationary seat 55 is provided with a protruding dish 551; Tapped blind hole on this protruding dish 551 on the corresponding machine sealed cover 53 is offered pin-and-hole, and this stationary seat 55 can be sleeved on the middle part of machine envelope axle sleeve 51 through threaded 550 with moving axially and be connected on the ear end face of flange 531 of machine sealed cover 53;

Stationary ring 56 be sleeved on stationary seat 55 outer surface the rear portion and be connected through step pin 560 on the ear end face of protruding dish 551 of stationary seat 55;

Some springs 57 are placed in the blind hole of machine sealed cover 53 one by one, and the rear end of these some springs 57 is connected on the front-end face of stationary seat 55, so that the ear end face of stationary ring 56 is fitted with the front-end face of rotating ring 54 all the time;

Restrictor ring 58 is located in the pit of machine sealed cover 53;

Baffle plate 59 is connected on the front-end face of machine sealed cover 53 through positioning block 590;

Between machine envelope axle sleeve 51 and the pump shaft 11, rotating ring 54 seals between the axle sleeve 51 with machine, between stationary ring 56 and the stationary seat 55, between stationary seat 55 and the machine sealed cover 53, between restrictor ring 58 and the machine sealed cover 53 O-ring seals 512 is set respectively, in case the leakage of solution stopping body.

The working principle of gland seal device is: in the pump operation process; In the chamber that sealed letter body 17 and machine sealed cover 53 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 54 is stressed does not wait; Can form impacting force, and stationary ring 56 fits the surface of contact appropriateness that forms between rotating ring 54 and the stationary ring 56 through spring 57, 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 56.In addition, after rotating ring 54 and stationary ring 56 lost efficacy, restrictor ring 58 can effectively limit the amount of leakage of medium, and does not influence the level that pump continues operation.

The structure and material of gland seal device is all by the operating mode design of the thermal shock that can bear 180 ℃ of high temperature and 15～180 ℃, and pipeline is revealed in configuration on gland seal device, prevents to be with radiation medium to leak, and it is simple, quick that this gland seal device is installed, and is easy to safeguard.

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

1. used in nuclear power station residual heat removal pump; Comprise stator component, rotor part, bearing part and gland seal device; Said stator component comprises pump case, be located at the stator of pump case inner chamber, be connected the pump cover of pump case front end and be connected the sealed letter body of pump cover front end, and said rotor part comprises pump shaft, is sleeved on the pump shaft and is positioned at the impeller of the inner chamber of said stator through impeller nut; Said bearing part comprise front and rear portions be respectively equipped with the bearing support of bearing bore, cover the bearing support two ends bearing gland, be arranged on the drive end bearing in the fore bearing chamber and be arranged on the non-driven-end bearing in the rear bearing chamber; Said gland seal device is located at the inner chamber of said sealed letter body; It is characterized in that

2. used in nuclear power station residual heat removal pump according to claim 1 is characterized in that, said bearing protector comprises rotor cover, stator cover, cutter and exciter,

3. used in nuclear power station residual heat removal pump according to claim 1 is characterized in that, said gland seal device comprises machine envelope axle sleeve, pump efficiency ring, machine sealed cover, rotating ring, stationary seat, stationary ring, some springs, restrictor ring and baffle plate,

Said restrictor ring is located in the pit of said machine sealed cover;

4. used in nuclear power station residual heat removal pump according to claim 1; It is characterized in that; The width of tank that is positioned at said bearing support front and rear part is greater than the width of the tank that is positioned at said bearing support middle part; And be positioned at the width of the width of the anterior tank of said bearing support greater than the tank that is positioned at said bearing support rear portion, it is L-shaped to be positioned at the anterior tank of said bearing support.

5. used in nuclear power station residual heat removal pump according to claim 1; It is characterized in that; The intake pipe of said cooling water pipeline is connected on the tank that is positioned at said bearing support rear portion, and the outlet pipe of said cooling water pipeline is connected and is positioned on the anterior tank of said bearing support.

6. used in nuclear power station residual heat removal pump according to claim 2; It is characterized in that; The maze trough that said stator puts has three roads, and the maze trough that said rotor puts has two roads, and the rear end of the interior edge face of said rotor cover also is provided with a step hole; The internal groove side wall of the interior road maze trough of said stator cover is embedded in the step hole of said rotor cover with gap, and said cutter and exciter all are located in the interior side line maze trough of said rotor cover.

7. according to claim 2 and 6 described any one used in nuclear power station residual heat removal pumps, it is characterized in that the exterior edge face of the interior edge face of said stator cover and said rotor cover is respectively equipped with a hydrops groove.

8. according to claim 2 and 6 described any one described used in nuclear power station residual heat removal pumps; It is characterized in that, said bearing protector also comprise one be located at the outer side line maze trough of said stator cover the middle part cell wall that overlaps of external groove sidevall and said rotor between the end face backplate.

9. used in nuclear power station residual heat removal pump according to claim 1 is characterized in that, said rotating ring radially is fixed on the said machine envelope axle sleeve through the step pin; Said stationary ring radially is fixed on the said stationary seat through the step pin; Said stationary seat is installed in through threaded on the ear end face of flange of said machine sealed cover.

10. used in nuclear power station residual heat removal pump according to claim 3; It is characterized in that, between said machine envelope axle sleeve and the said pump shaft, said rotating ring and said machine seals between the axle sleeve, between said stationary ring and the said stationary seat, between said stationary seat and the said machine sealed cover, between said restrictor ring and the said machine sealed cover 0 shape seal ring is set respectively.