CN203257721U - Main water-feeding pump - Google Patents
Main water-feeding pump Download PDFInfo
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- CN203257721U CN203257721U CN 201320182332 CN201320182332U CN203257721U CN 203257721 U CN203257721 U CN 203257721U CN 201320182332 CN201320182332 CN 201320182332 CN 201320182332 U CN201320182332 U CN 201320182332U CN 203257721 U CN203257721 U CN 203257721U
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Abstract
The utility model discloses a main water-feeding pump in the field of nuclear power equipment. The main water-feeding pump comprises a stator part, a loose core shell, a pump shaft, two sets of shaft seals which are oppositely arranged, a drive end bearing and a non-drive end bearing. The stator part comprises a pump body, a front pump cover, a rear pump cover and a bearing bracket, wherein the front pump cover and the rear pump cover are correspondingly located at the front end and the rear end of the pump body. The bearing bracket is fixed on the rear end face of the rear pump cover. The front end and the rear end of the loose core shell are correspondingly fixed with the pump body and the rear pump cover. A water sucking chamber is arranged between the front end of the loose core shell and the front pump cover. The pump shaft axially penetrates through the stator part and the loose core shell. A balancing drum which fixedly sleeves the pump shaft in a connected mode and a balancing sleeve are arranged between the pump shaft and the rear pump cover in the radial direction. The balancing sleeve sleeves on the outer periphery of the balancing drum in a connected mode and is fixed with the rear pump cover. Balancing cavities are formed among the balancing drum, the balancing sleeve, the rear pump cover and the bearing bracket. A depressurization through hole is formed in the top of the rear pump cover.
Description
Technical field
The utility model relates to a kind of main feed pump in nuclear power equipment field.
Background technique
Main feed pump is non-nuclear level pump, the major function of main feed pump is in pressurized-water reactor nuclear power plant: the water that comes to oxygen-eliminating device pressurizes, then the water that comes of oxygen-eliminating device enters high-pressure heater and steam generator, makes the steam generator generating steam go to drive the main steam turbine generating of nuclear power station.And in the stage in period of a loop reactor shutdown, what the waste heat in the heap also can make main feed pump gives water generates steam, and the heat of a loop medium is derived, and plays the effect in cooling one loop.Moreover be when the accident conditionses such as the unexpected removal of load of main steam turbine or generating steam pipeline breaking, main feed pump also can play the effect that unnecessary heat is derived.Therefore, the operational reliability of main feed pump is very important.
Because main feed pump moves under high pressure conditions, thus the high-pressure liquid water carried of main feed pump, nearly 180 ℃ of its temperature.Therefore present main feed pump exists two problems, and one is that the pump shaft of main feed pump is subject to huge axial force in running, the safe operation of main feed pump has been produced seriously influence.In addition on the one hand, in order to guarantee the validity of gland seal device, main feed pump is before carrying out when washing to gland seal device, the temperature of high-pressure liquid water must drop to below 80 ℃, therefore the axial force that how the balance pump shaft is subject to and carry out before flushing the temperature of high-pressure liquid water is dropped to below 80 ℃ at the shaft seal end face to gland seal device is a technological difficulties problem during main feed pump designs.
The model utility content
The purpose of this utility model is in order to overcome the deficiencies in the prior art, a kind of main feed pump for nuclear power station to be provided, and it can realize the axial equilibrium of forces of pump shaft, effectively prolongs the working life of main feed pump and makes pump structure more simple compact.
A kind of technological scheme that realizes above-mentioned purpose is: a kind of main feed pump comprises stator component, two cover gland seal device, drive end bearing and non-driven-end bearings of the housing of loosing core, pump shaft, opposing setting;
Described stator component comprises that the pump housing, correspondence are positioned at front pump cover and the rear pump cover of described pump housing rear and front end, and be fixed on bearing bracket on the described rear pump cover ear end face, form the pump chamber of main feed pump between the described pump housing, described front pump cover and described rear pump cover, the top of described pump chamber is provided with a pump chamber import and a pump chamber outlet;
The described housing of loosing core is arranged in described pump chamber, and the rear and front end of the described housing of loosing core is corresponding to be fixed with the described pump housing and described rear pump cover, forms suction chamber between the front end of the described housing of loosing core and the rear end of described front pump cover;
Described pump shaft axially runs through described stator component and the described housing of loosing core;
Described pump shaft and described rear pump cover radially between be provided with fixedly sleeved balancing drum on described pump shaft, and be socketed on the described balancing drum excircle and with the fixing balance set of described rear pump cover; Described balancing drum, described balance set, described rear pump cover and described bearing bracket between form counter balance pocket;
The top of described rear pump cover has a step-down through hole radially, and this step-down through hole is communicated with described pump chamber import by an equalizing line.
Further, the inner circumference of described balance set is provided with the compensating groove of the annular that axially is arranged in order along described balance set, and two end faces of described balance set are provided with the swirling flow port of annular.
Further, described two cover gland seal devices are respectively at the radially inner side of described front pump cover, and the radially inner side of described bearing bracket is socketed with described pump shaft;
Be provided with in the described counter balance pocket and the rear cooling chamber of described pump shaft socket, cooling chamber and described bearing bracket front-end face are fixed after this, are provided with the front cooling chamber that is socketed with described pump shaft in the described suction chamber, and the ear end face of this front cooling chamber and described front pump cover is fixed; All be full of the cooling water that is in recurrent state in described rear cooling chamber and the described front cooling chamber;
Described rear cooling chamber and described pump shaft radially between be provided with the rear nockbush that is socketed on the described pump shaft, described front cooling chamber and described pump shaft radially between be provided with the front nockbush that is socketed on the described pump shaft.
Further, described rear cooling chamber is surrounded by rear cooling chamber gland, bearing bracket and rear coolant jacket, described rear cooling chamber gland is fixed on the front-end face of described bearing bracket, the inner circumference of the excircle of described rear coolant jacket and the inner circumference of described bearing bracket and described rear cooling chamber gland is fixed, and the excircle of described rear coolant jacket is provided with rear annular choked flow groove;
Described front cooling chamber is surrounded by front cooling chamber gland, front pump cover and front coolant jacket, described front cooling chamber gland is fixed on the ear end face of described front pump cover, the inner circumference of the excircle of described front coolant jacket and the inner circumference of described front pump cover and described front cooling chamber gland is fixed, and the excircle of described front coolant jacket is provided with front annular choked flow groove.
Further, be equipped with a machine sealing chamber in the described two cover gland seal devices;
Be positioned at the gland seal device of described bearing bracket radially inner side, its machine sealing chamber connects the water outlet of the first rear heat exchanger by being positioned at the first rear water inlet through hole on the described bearing bracket, refluxing chamber after forming between this gland seal device and the described rear cooling chamber, described rear refluxing chamber connect the water intake of the first rear heat exchanger by being positioned at the first rear water outlet through hole on the described bearing bracket;
Be positioned at the gland seal device of described front pump cover radially inner side, its machine sealing chamber connects the water outlet of the first front heat exchanger by being positioned at the first advancing water through hole on the front pump cover, refluxing chamber before forming between this gland seal device and the described front cooling chamber, described front refluxing chamber connect the water intake of the first front heat exchanger by being positioned at the first front water outlet through hole on the described front pump cover.
Further, described gland seal device comprises: rotating seat, rotating ring, stationary seat, stationary ring, machine sealed cover and sealed letter body;
Described rotating seat is fixedly sleeved on described pump shaft, and described rotating seat, described sealed letter body and described machine sealed cover surround described machine sealing chamber;
Described rotating ring, described stationary seat and described stationary ring all are positioned at described machine sealing chamber, and described rotating ring is fixed on the described rotating seat, and described stationary ring is fixed on the described stationary seat; Described stationary seat fix with described machine sealed cover and by some spring shafts that are in compressive state to being connected, the axially loaded of described rotating ring and described stationary ring is contacted.
Also want further, described sealed letter body is provided with a cooling through hole;
Be positioned at the gland seal device of described front pump cover radially inner side, its cooling through hole connects the first advancing water through hole on the described front pump cover;
Be positioned at the gland seal device of described bearing bracket radially inner side, its cooling through hole connects the first rear cooling through hole on the described bearing bracket.
Further, the inducer chamber that is provided with N level pumping chamber in the described housing of loosing core and is prepended to described N level pumping chamber, the indoor inducer that is socketed on the described pump shaft that is provided with of described inducer, first of described N level pumping chamber is equipped with stator in the N pumping chamber, and the impeller that in the inner chamber of described stator, is socketed with described pump shaft, be provided with impeller ring between the front shroud of described impeller and the described stator, described first order pumping chamber first in the N-pumping chamber, the wheel hub of described impeller and described stator radially between be provided with guide blade sleeve.
Further, described non-driven-end bearing is tilting pad bearing;
Described non-driven-end bearing comprises the second bearing support, is fixed on forward thrust tile fragment seat and back pressure tile fragment seat on described the second bearing support inner circumference, and the thrust disc that is socketed in described pump shaft, described non-driven-end bearing is fixed on the ear end face of described bearing bracket by described the second bearing support, described forward thrust tile fragment seat and described back pressure tile fragment seat bilateral symmetry before and after described thrust disc arranges, described thrust disc and described the second bearing support are provided with the thrust disc overcoat that is socketed on the described thrust disc excircle between radially
Be provided with some around the uniform forward thrust tile fragment of described pump shaft between the front-end face of described forward thrust tile fragment seat and described thrust disc;
Be provided with some around the uniform back pressure tile fragment of described pump shaft between the ear end face of described back pressure tile fragment seat and described thrust disc.
Adopt the technological scheme of a kind of main feed pump of the present utility model, one step-down through hole namely is set on the top of rear pump cover, pressure in the counter balance pocket that is surrounded by balancing drum, balance set, rear pump cover and bearing bracket is equated with pressure in the main feed pump suction chamber, thereby make balancing drum be subject to a technological scheme of pointing to the thrust of described counter balance pocket.Its technique effect is: the suffered axial force of main feed pump pump shaft has obtained effective balance, and the safe operation of main feed pump is guaranteed.
Description of drawings
Fig. 1 is the structural representation of a kind of main feed pump of the present utility model.
Fig. 2 is the structural representation of loose core housing and the pump shaft of a kind of main feed pump of the present utility model.
Fig. 3 is the structural representation of the pump shaft of a kind of main feed pump of the present utility model.
Fig. 4 is the structural representation of the balance set of a kind of main feed pump of the present utility model.
Fig. 5 is the structural representation of the gland seal device of a kind of main feed pump of the present utility model.
Fig. 6 is the structural representation of the drive end bearing of a kind of main feed pump of the present utility model.
Fig. 7 is the ear end face figure of the drive end bearing of a kind of main feed pump of the present utility model.
Fig. 8 is the structural representation of the non-driven-end bearing of a kind of main feed pump of the present utility model.
Embodiment
In order to understand the technical solution of the utility model better, below by embodiment particularly, and be described in detail by reference to the accompanying drawings:
See also Fig. 1, a kind of main feed pump for nuclear power station of the present utility model comprises stator component, mechanical seal 4, drive end bearing 5 and the non-driven-end bearing 6 of the housing 2 of loosing core, pump shaft 30, the opposing setting of two covers.
Stator component comprises the pump housing 11, front pump cover 12, rear pump cover 13 and bearing bracket 14.Front pump cover 12 is bolted on the front end 11 of the pump housing, and rear pump cover 13 is bolted on the rear end of the pump housing 11.Bearing bracket 14 is bolted on the ear end face of rear pump cover 13.The pump housing 11, front pump cover 12 and rear pump cover 13 surround the pump chamber of main feed pump.The top of the pump housing 11 is respectively equipped with pump chamber import and pump chamber outlet.Described pump chamber import is positioned at the front portion of the pump housing 11, and described pump chamber inlet is provided with suction flange pipe 111, and described pump chamber outlet is positioned at the pump housing 11 rear portions, and described pump chamber outlet port is provided with outlet(discharge) flange pipe 112.The pump housing 11, front pump cover 12, rear pump cover 13, suction flange pipe 111 and outlet(discharge) flange pipe 112 are all made by stainless steel forgings.Suction flange pipe 111 and outlet(discharge) flange pipe 112 weld by stainless steel bead-welding technology and the pump housing 11.Guaranteed like this serviceability of stator component.
The housing 2 of loosing core is positioned at the pump chamber of main feed pump.The housing 2 of loosing core comprises inducer housing 201, preposition blower inlet casing 202, the first blower inlet casing 203, the second blower inlet casing 204, the 3rd blower inlet casing 205 and the space from end plate 206 that axially sets gradually along described pump chamber.Inducer housing 201, preposition blower inlet casing 202, the first blower inlet casing 203, the second blower inlet casing 204, the 3rd blower inlet casing 205 axially connect successively by bolt.What form high-pressure liquid water between the ear end face of inducer housing 201, the pump housing 11 and front pump cover 12 enters the suction chamber of described pump chamber from suction flange pipe 111.Inducer housing 201, preposition blower inlet casing 202 have surrounded the inducer chamber of the housing 2 of loosing core, and have formed the first pumping chamber between preposition blower inlet casing 202 and the first blower inlet casing 203, are provided with the first stator 211 of fixing with preposition blower inlet casing 202 in the first pumping chamber; Form the second pumping chamber between the first blower inlet casing 203 and the second blower inlet casing 204, be provided with the second stator 212 of fixing with the first blower inlet casing 203 in the second pumping chamber; Form the 3rd pumping chamber between the second blower inlet casing 204 and the 3rd blower inlet casing 205, be provided with the 3rd stator 213 of fixing with the 3rd blower inlet casing 205 in the 3rd pumping chamber; Formed the 4th pumping chamber between the 3rd blower inlet casing 205 and the end separator 206, be provided with the 4th stator 214 of fixing with the 3rd blower inlet casing 205 in the 4th pumping chamber, end separator 206 is fixing by pin and the 4th stator 214.Preposition blower inlet casing 202 is fixing by bolt and the pump housing 11, and end separator 206 is fixing by dish spring and rear pump cover 13, and the housing 2 of loosing core is fixed in the pump chamber of main feed pump.Therefore, the housing 2 of loosing core has formed the structure that the inducer chamber adds the level Four pumping chamber in the axial direction.
First to fourth impeller 321～324 is socketed with pump shaft 30 in the inner chamber of first to fourth stator 211～214 accordingly.
The front shroud of the first impeller 321 and the first stator 211 radially between be provided with the first impeller ring 341, the front shroud of the second impeller 322 and the second stator 212 radially between be provided with the second impeller ring 342, the front shroud of trilobed wheel 323 and the 3rd stator 213 radially between be provided with the front shroud of trilobed wheel seal ring 343, the four impellers 324 and the 4th stator 214 radially between be provided with the 4th impeller ring 344.
The wheel hub of the first impeller 321 and the first stator 211 radially between be provided with the first guide blade sleeve 351, the wheel hub of the second impeller 322 and the second stator 212 radially between be provided with the wheel hub of the second guide blade sleeve 352, the trilobed wheels 323 and the 3rd stator 213 radially between be provided with the 3rd guide blade sleeve 353.
The Brinell hardness of first to fourth impeller ring 341～344 equates; the Brinell hardness of the first to the 3rd guide blade sleeve 351～353 also equates; the Brinell hardness of first to fourth impeller ring 341～344 is greater than the Brinell hardness of the first to the 3rd guide blade sleeve 351～353; can protect like this first to fourth impeller 321～324 to avoid cavitation erosion, prolong the working life of first to fourth impeller 321～324.
Here mandatory declaration be: the pumping chamber that the housing 2 of loosing core arranges is not limited to level Four, and three grades, Pyatyi, six grades also are fine.
First to fourth impeller 321～324 and first to fourth stator 211～214, used material is 13% chromium stainless steel precision and waters foundry goods, obtains therefrom fabulous surface finishment and intensity, shape and high duplication when high-precision.
In the present embodiment, the housing 2 of loosing core is pressure-containing members of main feed pump inside, and itself and described stator component consist of the principal pressure border of main feed pump together.Therefore, the housing 2 of loosing core, pump shaft 30 and inducer 31 are selected stainless steel material, because stainless steel material antiscour decay resistance is quite excellent.
Balancing drum 33 is fixedly sleeved at radially inner side and the pump shaft 30 of rear pump cover 13, front end at balancing drum 33, be also to be provided with the balancing drum inner sleeve 331 that is socketed on the pump shaft 30 between balancing drum 33 and the 4th impeller 324, balancing drum 33 is by balancing drum inner sleeve 331 and pump shaft 30 shaft shoulders location.Balancing drum 33 is by key and pump shaft 30 radial locations, and fastening with pump shaft 30 by the balance nut 332 that is positioned on balancing drum 33 inner circumferences.
Balancing drum 33 and rear pump cover 13 radially between the socket balance set 15.Shaft shoulder location between balance set 15 and the rear pump cover 13, and be bolted.Balancing drum 33 and balance set 15 leave radial clearance between radially.In balance set 15 interior rotations, so balancing drum 33 and balance set 15 consists of a decompressor to balancing drum 33 under the drive of pump shaft 30.Balance set 15 adopts stainless steel forgings to make.The Brinell hardness of balance set 15 is less than the Brinell hardness of balancing drum 33, and the Brinell hardness between balance set 15 and the balancing drum 33 is poor, be and the first to the 3rd guide blade sleeve 351～353 and first to fourth impeller ring 341～344 between poor equating of Brinell hardness.Can improve so described decompressor reliability of operation.
Like this, formed counter balance pocket 100 between rear pump cover 13, balance set 15, balancing drum 33 and the bearing bracket 14.The top of rear pump cover 13 is provided with a step-down through hole 131 radially, this step-down through hole is connected to the pump chamber import of main feed pump, i.e. suction flange pipe 111 places of main feed pump by equalizing line, therefore the pressure in the counter balance pocket 100 and described pump chamber inlet, namely the pressure at suction chamber place is equal.Because pump chamber import in the main feed pump, be that the pressure at suction chamber place is less than the pressure in the afterbody pumping chamber in the described multistage pumping chamber, former and later two end faces of balancing drum 33 produce pressure difference like this, give balancing drum 33 1 thrust F that point to counter balance pocket 100, corresponding, pump shaft 30 is subject to an axial pulling force, make pump shaft 30 be in extended state, thereby the axial force that balance pump shaft 30 is subject to prevents that pump shaft 30 from damaging, and ensures the safe operation of main feed pump in the process of main feed pump operation.
Simultaneously the inwall of balance set 15 is provided with the compensating groove 151 of some annulars along balance set 15 axially-aligned, be respectively equipped with the swirling flow fracture 152 of annular on two end faces of balance set 15, the purpose of design is like this: improved the hydrostatic rigidity of high-pressure liquid water in the pump chamber of main feed pump, reduce simultaneously the leakage of the pump chamber inner high voltage liquid water of main feed pump, namely controlled the flow of the radial clearance inflow counter balance pocket 100 of high-pressure liquid water between balance set 15 and balancing drum 33 in main feed pump the 4th pumping chamber.
Two gland seal devices 4 of main feed pump are socketed at radially inner side and the pump shaft 30 of front pump cover 12 respectively, and are socketed at radially inner side and the pump shaft 30 of bearing bracket 14.And these two gland seal devices 4 are opposing layouts.For the high-pressure liquid water that can wash gland seal device 4 cools to below 80 ℃ from 180 ℃, again gland seal device 4 is carried out from flushing after must cooling off the high-pressure liquid water in counter balance pocket 100 and the described suction chamber.
Be provided with a rear cooling chamber gland 161 of fixing with bearing bracket 14 front-end faces in the counter balance pocket 100, the radially inner side of rear cooling chamber gland 161 is provided with the rear coolant jacket 162 with pump shaft 30 sockets, the inner circumference of the excircle of rear coolant jacket 162 and rear cooling chamber gland 161, and bearing bracket 14 inner circumferences are fixing simultaneously.Cooling chamber 160 after forming between the front-end face of the excircle of the inner circumference of rear cooling chamber gland 161, rear coolant jacket 162 and bearing bracket 14.Be full of cooling water in the rear cooling chamber 160.Rear cooling chamber 160 is communicated with the second rear heat exchanger (not shown) by the second rear water inlet through hole (not shown) and the second rear water outlet through hole (not shown) that is positioned on the bearing bracket 14, and the second rear heat exchanger cools off the cooling water in the rear cooling chamber 160 and circulates.In order to prevent that the cooling water in the rear cooling chamber 160 from leaking, the front-end face of the first front cooling chamber gland 161, the front-end face of rear coolant jacket 162 pass through rear coolant jacket nut 163 to be fixed.Rear cooling chamber gland 161 is designed to conical purpose and is the high-pressure liquid water in the counter balance pocket 100 is imported step-down through hole 131.
Formed the radial clearance for the high-pressure liquid water overcurrent in the counter balance pocket 100 simultaneously between coolant jacket 162 and the pump shaft 30.High-pressure liquid water carries out heat exchange from the process of this radial clearance overcurrent by the cooling water in rear coolant jacket 162 and the rear cooling chamber 160, reduces the temperature of high-pressure liquid water.In order to delay the flow velocity of high-pressure liquid water between rear coolant jacket 162 and pump shaft 30, make high-pressure liquid water have the cooling water in sufficient time and the rear cooling chamber 160 to exchange, rear coolant jacket 162 and pump shaft 30 radially between the rear nockbush 36 be socketed on the pump shaft 30 is set, the rear end of rear nockbush 36 is fixing by rear nockbush nut 361.The another one effect of rear nockbush 36 is to prevent that pump shaft 30 is subject to producing thermal distortion under the effect of high-pressure liquid water, affects the normal operation of main feed pump.In order to accelerate the cooling water in the rear cooling chamber 160 and to be positioned at rear coolant jacket 162 and the heat exchange of 30 high-pressure liquid water of pump shaft, reduce the temperature of coolant jacket 162 and 30 high-pressure liquid water of pump shaft, the excircle of rear coolant jacket 162 is provided with the some rear annular choked flow groove 164 that axially is arranged in parallel successively along rear coolant jacket 162.
Be provided with a front cooling chamber gland 181 of fixing with front pump cover 12 ear end faces in the described suction chamber, the radially inner side of front cooling chamber gland 181 is provided with front coolant jacket 182, the inner circumference of front coolant jacket 182 and pump shaft 30 sockets, the inner circumference of the excircle of front coolant jacket 182 and front cooling chamber gland 181, and front pump cover 12 inner circumferences are fixing simultaneously.The excircle of the inner circumference of front cooling chamber gland 181, front coolant jacket 182, and cooling chamber 180 before forming between the ear end face of front pump cover 12.Be full of cooling water in the front cooling chamber 180.Front cooling chamber 180 is communicated with the second front heat exchanger (not shown) by the second advancing water through hole (not shown) and the second front water outlet through hole (not shown) that is positioned on the front pump cover 12, and the second front heat exchanger circulates to the cooling water in the front cooling chamber 180 and cools off.In order to prevent that the cooling water in the front cooling chamber 180 from leaking, it is fixing that the first front cooling chamber gland 181, the ear end face of front coolant jacket 182 pass through front shaft sleeve nut 183.Formed the radial clearance for high-pressure liquid water overcurrent simultaneously between coolant jacket 182 and the pump shaft 30.High-pressure liquid water carries out heat exchange by the cooling water in front coolant jacket 182 and the front cooling chamber 180 in the process of this radial clearance overcurrent, reduce the temperature of high-pressure liquid water.In order to delay the flow velocity of high-pressure liquid water in this radial clearance, make high-pressure liquid water in this radial clearance have sufficient time and cooling water in the front cooling chamber 180 to exchange, front coolant jacket 182 and pump shaft 30 radially between setting be socketed in front nockbush 37 on the pump shaft 30.The front end of front nockbush 37 is fixed by front nockbush nut 371, and the rear end of front nockbush 37 is fixing by axle sleeve 372.In order to accelerate the cooling water in the front cooling chamber 180 and to be positioned at coolant jacket 182 and the heat exchange of 30 high-pressure liquid water of pump shaft, the temperature of coolant jacket 182 and 30 high-pressure liquid water of pump shaft before reducing, the excircle of front coolant jacket 182 are provided with the some front annular choked flow groove 184 that axially is arranged in parallel successively along front coolant jacket 182.
Gland seal device 4 comprises rotating seat 41, rotating ring 42, stationary seat 43, stationary ring 44, machine sealed cover 45 and sealed letter body 46 and baffle plate 47;
Rotating seat 41 is fixedly sleeved on pump shaft 30, and machine sealed cover 45 is socketed on the excircle at rotating seat 41 rear portions, and sealed letter body 46 is socketed on the excircle of machine sealed cover 45 and rotating seat 41 simultaneously.Rotating seat 41, sealed letter body 46 and machine sealed cover 45 surround machine sealing chamber 40.Leave radial clearance between sealed letter body 46 and the rotating seat 41, the top of sealed letter body 46 is provided with cooling through hole 461, gland seal device 4 is carried out entering machine sealing chamber 40 from the high-pressure liquid water of flushing from cooling through hole 461, flow out machine sealing chamber 40 from the radial clearance between sealed letter body 46 and the rotating seat 41.
Rotating ring 42, stationary seat 43, stationary ring 44 all are positioned at machine sealing chamber 40.The excircle of rotating ring 42 and front-end face and rotating seat 41 are fixing.The excircle of stationary ring 44 and ear end face and stationary seat 43 are fixing.The inner circumference of the excircle of stationary seat 43 and machine sealed cover 45 is fixed.Simultaneously, the ear end face of stationary seat 43 axially is connected by some springs 48 that are in compressive state with the front-end face of machine sealed cover 45, makes axially loaded contact between the front-end face of the ear end face of rotating ring 42 and stationary ring 44, forms the shaft seal end face of gland seal device 4.
In order to prevent that the high-pressure liquid water in the machine sealing chamber 40 from leaking.The ear end face of machine sealed cover 45 is provided with baffle plate 47, and rotating seat 44 and sealed letter body 46 is fixing.
In order to guarantee the sealing of gland seal device 4, between rotating seat 41 and the pump shaft 30, between rotating seat 41 and the rotating ring 42, between stationary ring 44 and the stationary seat 43, between stationary seat 43 and the machine sealed cover 45 and be equipped with O-ring seals between machine sealed cover 45 and the sealed letter body 46.
The gland seal device 4 that is positioned at front pump cover 12 radially inner sides is oppositely to be socketed on the pump shaft 30, the gland seal device 4 that is positioned at bearing bracket 14 radially inner sides is that forward is socketed on the pump shaft 30, therefore, the cover of two on the main feed pump of the present utility model gland seal device 4 is opposing settings.
Be positioned at the gland seal device 4 of bearing bracket 14 radially inner sides, its sealed letter body 46 and bearing bracket 14 are fixed by screw axial.Refluxing chamber 17 after forming one between the front-end face of this gland seal device 4 and the rear cooling chamber 160.Should after refluxing chamber 17 connect the water intake of the first rear heat exchanger (not shown) by being positioned at the first rear water outlet through hole (not shown) on the bearing bracket 14.The first rear water inlet through hole 141 on the cooling through hole 461 on sealed letter body 46 tops of this gland seal device 4 and the bearing bracket on 14 is connected, and the first rear water inlet through hole 141 connects the water outlet of described the first rear heat exchanger.
In the process of main feed pump operation, in the high-pressure liquid water that main feed pump is carried, part high-pressure liquid water enters rear refluxing chamber 17 from the radial clearance between rear coolant jacket 162 and the rear nockbush 36.High-pressure liquid water elder generation heat exchanger after the water outlet through hole enters described first after described first in the rear refluxing chamber 17 cools off.Then the cooling through hole 461 of the high-pressure liquid water in the described first rear heat exchanger on water inlet through hole 141 and this gland seal device 4 after first, enter the machine sealing chamber 40 of this gland seal device 4, this gland seal device 4 is carried out from flushing, after flushing is finished, high-pressure liquid water in the machine sealing chamber 40, the radial clearance that driven ring seat 41 and sealed letter body are 46 flows back to rear refluxing chamber 17.Therefore when this gland seal device 4 was washed, high-pressure liquid water was in machine sealing chamber 40 and 17 circulations of rear cooling chamber.
Because high-pressure liquid water is before washing this gland seal device 4, twice cooling of refluxing chamber 17 behind the cooling chamber 160 and first after having passed through, guaranteed this gland seal device 4 is carried out when washing, the temperature of high-pressure liquid water is below 80 ℃, guarantee the validity of this gland seal device 4, guaranteed the safe operation of main feed pump.
Be positioned at the gland seal device 4 of front pump cover 12 radially inner sides, its sealed letter body 46 and front pump cover 12 are fixed by screw axial.Form a front refluxing chamber 19 between the front-end face of this gland seal device 4 and the front cooling chamber 180.Should before refluxing chamber 19 connect the water intake of the first front heat exchanger (not shown) by being positioned at the first front water outlet through hole (not shown) on the front pump cover 12.The cooling through hole 461 on sealed letter body 46 tops of this gland seal device 4 is connected with the first advancing water through hole 121 on the front pump cover 12, and the first advancing water through hole 121 connects the water outlet of described the first front heat exchanger.
In the process of main feed pump operation, in the high-pressure liquid water that main feed pump is carried, part high-pressure liquid water enters front refluxing chamber 19 from the radial clearance between coolant jacket 182 and the front nockbush 37.High-pressure liquid water in the front refluxing chamber 19 enters the described first front heat exchanger through the described first front water outlet through hole first and cools off.Then the cooling through hole 461 of the high-pressure liquid water in the described first front heat exchanger on the first advancing water through hole 121 and this gland seal device 4, enter the machine sealing chamber 40 of this gland seal device 4, this gland seal device 4 is carried out from flushing, after flushing is finished, high-pressure liquid water in the machine sealing chamber 40, the radial clearance that driven ring seat 41 and sealed letter body are 46 flows back to front refluxing chamber 19.Therefore when this gland seal device 4 was washed, high-pressure liquid water was in machine sealing chamber 40 and 19 circulations of front refluxing chamber.
Because high-pressure liquid water is before washing this gland seal device 4, passed through twice cooling of front cooling chamber 180 and front refluxing chamber 19, guaranteed this gland seal device 4 is carried out when washing, the temperature of high-pressure liquid water is below 80 ℃, guarantee the validity of this gland seal device 4, guaranteed the safe operation of main feed pump.
A kind of main feed pump of the present utility model also comprises the drive end bearing 5 that is socketed in pump shaft 30 drive ends and the non-driven-end bearing 6 that is socketed in pump shaft 30 anti-drive ends, and pump shaft 30 is supported
Drive end bearing 5 is tilting pad bearing, comprises clutch shaft bearing seat 51, the first fore bearing end cap 52, the first rear bearing end cap 53, the first tile fragment 54, and fixedly sleeved the first oil baffle disc 301 and the second oil baffle disc 302 on pump shaft 30.Clutch shaft bearing seat 51 is bolted on the front-end face of front pump cover 12, and drive end bearing 5 and the front-end face of front pump cover 12 are fixed.
The first fore bearing end cap 52 the first oil baffle disc 301 and clutch shaft bearing seat 51 radially between, and with 51 clampings of clutch shaft bearing seat.Clutch shaft bearing seat 51 and the first fore bearing end cap 52 are radially fixing by bolt.Be provided with mazy type mechanical seal between the first fore bearing end cap 52 and the first oil baffle disc 301, leak from drive end bearing 5 to prevent lubricant oil.The first rear bearing end cap 53 clutch shaft bearing seat 51 and the second oil baffle disc 302 radially between.The first rear bearing end cap 53 and clutch shaft bearing seat 51 is radially fixing by bolt, and with 51 clampings of clutch shaft bearing seat.Be provided with mazy type mechanical seal between the first rear bearing end cap 53 and the second oil baffle disc 302, leak from drive end bearing 5 to prevent lubricant oil.The first tile fragment 54 is fixed on the inner circumference of clutch shaft bearing seat 51, is the first oil suction chamber and first row oil pocket with the space segmentation between clutch shaft bearing seat 51 and the pump shaft 30.
Clutch shaft bearing seat 51 is divided into the first upper bearing bracket 511, the first step 512, the first tile fragments 54 are divided into tile fragment 541 and first time tile fragment 542 on first, so that the suit of drive end bearing 5 and pump shaft 30.
The chamber that forms between tile fragment 541 and the first time tile fragment 542 on the first rear bearing end cap 53, the first upper bearing bracket 511, the first step 512, first is the first oil suction chamber.The first rear bearing end cap 53 is provided with the first oil-feed through hole 533 that enters described the first oil suction chamber for lubricant oil.
The chamber that forms between tile fragment 541 and the first time tile fragment 542 on the first fore bearing end cap 52, the first upper bearing bracket 511, the first step 512, first is the first row oil pocket.The bottom of clutch shaft bearing seat 51, namely the bottom of the first step 512 is provided with the first row through hole 513 of discharging described first row oil pocket for lubricant oil.
Be provided with the first disc 543 in described the first oil suction chamber, lubricant oil is got rid of gap between pump shaft 30 and the first tile fragment 54, drive end bearing 5 is lubricated, by described first row oil pocket lubricant oil is discharged drive end bearing 5 again.
Drive end bearing 5 is connected the first autonomous lubricating oil system (not shown) that connects simultaneously by the first oil-feed through hole 533 with the first row oil hole, should be by the circulation of this lubricating oil system realization lubricant oil.
Non-driven-end bearing 6 also is tilting pad bearing, comprise the second bearing support 61, the second fore bearing end cap 62, the second rear bearing end cap 63, the second tile fragment 64, forward thrust tile fragment seat 65, back pressure tile fragment seat 66, forward thrust tile fragment 67, back pressure tile fragment 68 and bearing interstage sleeve 69, and fixedly sleeved the 3rd oil baffle disc 303, thrust disc 304 and axial displacement dish 305 on pump shaft 30.The second bearing support 61 is bolted on the ear end face of bearing bracket 14, and non-driven-end bearing 6 and the ear end face of bearing bracket 14 are fixed.
The second fore bearing end cap 62 the 3rd oil baffle disc 303 and the second bearing support 61 radially between, and with 303 clampings of the 3rd oil baffle disc.The second bearing support 61 and the second fore bearing end cap 62 are radially fixing by bolt.Be provided with mazy type mechanical seal between the second fore bearing end cap 62 and the 3rd oil baffle disc 303, to prevent lubricant oil 6 leakages from non-driven-end bearing.
The second rear bearing end cap 63 the second bearing support 61 and axially displacement dish 305 radially between.Axially displacement dish 305 is used for detecting the axial displacement of pump shaft 30.
Be fixed with rear bearing end cap cover plate 631 on the ear end face of the second rear bearing end cap 63, enter non-driven-end bearing 6 to prevent dust.
The second tile fragment 64, bearing support interstage sleeve 69, forward thrust tile fragment seat 65, back pressure tile fragment seat 66 are fixed on the inner circumference of the second bearing support 61.The second tile fragment 64 is the second oil suction chamber and second row oil pocket with the space segmentation between the second bearing support 61 and the pump shaft 30.
The second bearing support 61 is divided into the second upper bearing bracket 611, the second step 612, the second tile fragments 64 are divided into tile fragment 641 and second time tile fragment 642 on second, so that the suit of non-driven-end bearing 6 and pump shaft 30.
The chamber that forms between tile fragment 641 and the second time tile fragment 642 on the second fore bearing end cap 62, the second upper bearing bracket 611, the second step 612, second is the second oil suction chamber.The second fore bearing end cap 63 is provided with the second oil-feed through hole (not shown) that enters described the second oil suction chamber for lubricant oil.
The chamber that forms between tile fragment 641 and the second time tile fragment 642 on bearing interstage sleeve 69, the second upper bearing bracket 611, the second step 612, second is the second row oil pocket.The bottom of the second bearing support 61, namely the bottom of the second step 612 is provided with the second row through hole 613 of discharging described second row oil pocket for lubricant oil.
Be provided with the second disc 643 in described the second oil suction chamber, lubricant oil is got rid of gap between pump shaft 30 and the second tile fragment 64, non-driven-end bearing 6 is lubricated, by described second row oil pocket and second row through hole 613 lubricant oil is discharged non-driven-end bearing 6 again.
Non-driven-end bearing 6 is connected simultaneously the second autonomous lubricating oil system (not shown) that connects by described the second oil-feed through hole (not shown) with the second row oil hole, should be by the circulation of this lubricating oil system realization lubricant oil.
Forward thrust tile fragment seat 65 and back pressure tile fragment seat 66 are arranged in thrust disc 304 front and back bilateral symmetry, thrust disc 304 and the second bearing support 61 are provided with the thrust disc overcoat 615 that is socketed on thrust disc 304 excircles between radially, and forward thrust tile fragment seat 65 and back pressure tile fragment seat 66 is radially fixing.
Forward thrust tile fragment seat 65 arranges near bearing interstage sleeve 69 ear end faces, and 65 of forward thrust tile fragment seats are comprised of the first forward thrust tile fragment seat 651 and the second forward thrust tile fragment seat 652.
Back pressure tile fragment seat 66 arranges near axial displacement dish 305 front-end faces, and 66 of back pressure tile fragment seats are comprised of the first back pressure tile fragment seat 661 and the second back pressure tile fragment seat 662.
Be provided with some forward thrust tile fragments 67 that center on the circumference uniform distribution of pump shaft 30 between the front-end face of forward thrust tile fragment seat 65 and thrust disc 304, in the present embodiment, the quantity of forward thrust tile fragment 67 is six.
Be provided with some back pressure tile fragments 68 around pump shaft 30 circumference uniform distributions between the ear end face of back pressure tile fragment seat 66 and thrust disc 304, in the present embodiment, the quantity of back pressure tile fragment 68 is six.
Forward thrust tile fragment seat 65 and thrust disc overcoat 615 are radially fixing with forward thrust tile fragment 67, and back pressure tile fragment seat 66 and thrust disc overcoat 615 are radially fixing with back pressure tile fragment 68.
Synergy by forward thrust tile fragment 67 and 68 pairs of thrust discs 304 of back pressure tile fragment, non-driven-end bearing 6 is when supporting pump shaft 30, balance the axial force that is subject to of pump shaft 30, guarantee that pump shaft 30 does not damage because of axial force, guaranteed the safe operation of main feed pump.
Those of ordinary skill in the art will be appreciated that, above embodiment illustrates the utility model, and be not to be used as restriction of the present utility model, as long as in connotation scope of the present utility model, all will drop in claims scope of the present utility model the above embodiment's variation, modification.
Claims (10)
1. main feed pump comprises stator component, two cover gland seal device (4), drive end bearing (5) and non-driven-end bearings (6) of the housing of loosing core (2), pump shaft (30), opposing setting;
Described stator component comprises that the pump housing (11), correspondence are positioned at front pump cover (12) and the rear pump cover (13) of the described pump housing (11) rear and front end, and be fixed on bearing bracket (14) on described rear pump cover (13) ear end face, form the pump chamber of main feed pump between the described pump housing (1), described front pump cover (12) and described rear pump cover (13), the top of described pump chamber is provided with a pump chamber import and a pump chamber outlet, it is characterized in that:
The described housing of loosing core (2) is arranged in described pump chamber, the rear and front end of the described housing of loosing core (2) is corresponding fixing with the described pump housing (11) and described rear pump cover (13), forms suction chamber between the rear end of the front end of the described housing of loosing core (2) and described front pump cover (12);
Described pump shaft (30) axially runs through described stator component and the described housing of loosing core (2);
Described pump shaft (30) and described rear pump cover (13) radially between be provided with fixedly sleeved balancing drum (33) on described pump shaft (30), and be socketed on described balancing drum (33) excircle and with the fixing balance set (15) of described rear pump cover (13); Described balancing drum (33), described balance set (15), described rear pump cover (13) and described bearing bracket (14) between form counter balance pocket (100);
The top of described rear pump cover (13) has a step-down through hole (131) radially, and this step-down through hole (131) is communicated with described pump chamber import by an equalizing line.
2. a kind of main feed pump according to claim 1, it is characterized in that: the inner circumference of described balance set (15) is provided with the compensating groove (151) of the annular that axially is arranged in order along described balance set (15), and two end faces of described balance set (151) are provided with the swirling flow port (152) of annular.
3. a kind of main feed pump according to claim 1 is characterized in that:
Described two cover gland seal devices (4) are respectively at the radially inner side of described front pump cover (12), and the radially inner side of described bearing bracket (14) is socketed with described pump shaft (30);
Be provided with in the described counter balance pocket (100) and the rear cooling chamber (160) of described pump shaft (30) socket, should fix with described bearing bracket (14) front-end face by rear cooling chamber (160), be provided with the front cooling chamber (180) that is socketed with described pump shaft (30) in the described suction chamber, this front cooling chamber (180) is fixed with the ear end face of described front pump cover (12); All be full of the cooling water that is in recurrent state in described rear cooling chamber (160) and the described front cooling chamber (180);
Described rear cooling chamber (160) and described pump shaft (30) radially between be provided with the rear nockbush (36) that is socketed on the described pump shaft (30), described front cooling chamber (180) and described pump shaft (30) radially between be provided with the front nockbush (37) that is socketed on the described pump shaft (30).
4. a kind of main feed pump according to claim 3 is characterized in that:
Described rear cooling chamber (160) is surrounded by rear cooling chamber gland (161), bearing bracket (14) and rear coolant jacket (162), described rear cooling chamber gland (161) is fixed on the front-end face of described bearing bracket (14), the inner circumference of the inner circumference of the excircle of described rear coolant jacket (162) and described bearing bracket (14) and described rear cooling chamber gland (161) is fixed, and the excircle of described rear coolant jacket (162) is provided with rear annular choked flow groove (164);
Described front cooling chamber (180) is surrounded by front cooling chamber gland (181), front pump cover (12) and front coolant jacket (182), described front cooling chamber gland (181) is fixed on the ear end face of described front pump cover (12), the inner circumference of the inner circumference of the excircle of described front coolant jacket (182) and described front pump cover (12) and described front cooling chamber gland (181) is fixed, and the excircle of described front coolant jacket (182) is provided with front annular choked flow groove (184).
5. it is characterized in that according to claim 3 or 4 described a kind of main feed pumps: be equipped with a machine sealing chamber (40) in the described two cover gland seal devices (4);
Be positioned at the gland seal device (4) of described bearing bracket (14) radially inner side, its machine sealing chamber (40) connects the water outlet of the first rear heat exchanger by being positioned at described bearing bracket (14) the upper first rear water inlet through hole (141), refluxing chamber (17) after forming between this gland seal device (4) and the described rear cooling chamber (160), described rear refluxing chamber (17) connect the water intake of the first rear heat exchanger by being positioned at the first rear water outlet through hole on the described bearing bracket (14);
Be positioned at the gland seal device (4) of described front pump cover (12) radially inner side, its machine sealing chamber (40) connects the water outlet of the first front heat exchanger by being positioned at upper the first advancing water through hole (121) of front pump cover (12), refluxing chamber (19) before forming between this gland seal device (4) and the described front cooling chamber (180), described front refluxing chamber (19) connect the water intake of the first front heat exchanger by being positioned at the first front water outlet through hole on the described front pump cover (12).
6. a kind of main feed pump according to claim 5, it is characterized in that: described gland seal device (4) comprising: rotating seat (41), rotating ring (42), stationary seat (43), stationary ring (44), machine sealed cover (45) and sealed letter body (46);
Described rotating seat (41) is fixedly sleeved on described pump shaft (30), and described rotating seat (41), described sealed letter body (46) and described machine sealed cover (45) surround described machine sealing chamber (40);
Described rotating ring (42), described stationary seat (43) and described stationary ring (44) all are positioned at described machine sealing chamber (40), and described rotating ring (42) is fixed on the described rotating seat (41), and described stationary ring (44) is fixed on the described stationary seat (43); Described stationary seat (43) is fixed with described machine sealed cover (45) and axially is connected by some springs (48) that are in compressive state, and described rotating ring (42) is contacted with the axially loaded of described stationary ring (44).
7. a kind of main feed pump for nuclear power station according to claim 5 is characterized in that: described sealed letter body (46) is provided with a cooling through hole (461);
Be positioned at the gland seal device (4) of described front pump cover (12) radially inner side, its cooling through hole (461) connects the first advancing water through hole (121) on the described front pump cover (12);
Be positioned at the gland seal device (4) of described bearing bracket (14) radially inner side, its cooling through hole (461) connects the first rear cooling through hole (141) on the described bearing bracket (14).
8. a kind of main feed pump according to claim 1, it is characterized in that: the inducer chamber that is provided with N level pumping chamber in the described housing of loosing core and is prepended to described N level pumping chamber, the indoor inducer (31) that is socketed on the described pump shaft (30) that is provided with of described inducer, first of described N level pumping chamber is equipped with stator in the N pumping chamber, and the impeller that in the inner chamber of described stator, is socketed with described pump shaft (30), be provided with impeller ring between the front shroud of described impeller and the described stator, described first order pumping chamber first in the N-1 pumping chamber, the wheel hub of described impeller and described stator radially between be provided with guide blade sleeve.
9. described a kind of main feed pump according to claim 1, it is characterized in that: described drive end bearing (5) is tilting pad bearing, described drive end bearing (5) is fixed with the front-end face of described front pump cover (12).
10. described a kind of main feed pump according to claim 1, it is characterized in that: described non-driven-end bearing (6) is tilting pad bearing;
Described non-driven-end bearing (6) comprises the second bearing support (61), be fixed on forward thrust tile fragment seat (65) and back pressure tile fragment seat (66) on described the second bearing support (61) inner circumference, and the thrust disc (304) that is socketed in described pump shaft (30), described non-driven-end bearing (6) is fixed on the ear end face of described bearing bracket (14) by described the second bearing support (61), described forward thrust tile fragment seat (65) and described back pressure tile fragment seat (66) bilateral symmetry before and after the described thrust disc (304) arranges, described thrust disc (304) and described the second bearing support (61) are provided with the thrust disc overcoat (615) that is socketed on described thrust disc (304) excircle between radially
Be provided with some around the uniform forward thrust tile fragment (67) of described pump shaft (30) between the front-end face of described forward thrust tile fragment seat (65) and described thrust disc (304);
Be provided with some around the uniform back pressure tile fragment (68) of described pump shaft (30) between the ear end face of described back pressure tile fragment seat (66) and described thrust disc (304).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320182332 CN203257721U (en) | 2013-04-12 | 2013-04-12 | Main water-feeding pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320182332 CN203257721U (en) | 2013-04-12 | 2013-04-12 | Main water-feeding pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203257721U true CN203257721U (en) | 2013-10-30 |
Family
ID=49470290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320182332 Expired - Fee Related CN203257721U (en) | 2013-04-12 | 2013-04-12 | Main water-feeding pump |
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| CN (1) | CN203257721U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103195759A (en) * | 2013-04-12 | 2013-07-10 | 上海阿波罗机械股份有限公司 | Main feed pump |
| CN110491532A (en) * | 2019-07-25 | 2019-11-22 | 岭澳核电有限公司 | Nuclear power station main pump abnormal leakage processing system and method |
-
2013
- 2013-04-12 CN CN 201320182332 patent/CN203257721U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103195759A (en) * | 2013-04-12 | 2013-07-10 | 上海阿波罗机械股份有限公司 | Main feed pump |
| CN110491532A (en) * | 2019-07-25 | 2019-11-22 | 岭澳核电有限公司 | Nuclear power station main pump abnormal leakage processing system and method |
| CN110491532B (en) * | 2019-07-25 | 2021-07-06 | 岭澳核电有限公司 | Nuclear power station main pump leakage abnormity processing system and method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131030 Termination date: 20160412 |