CN203532309U - Low pressure safety-injection pump - Google Patents
Low pressure safety-injection pump Download PDFInfo
- Publication number
- CN203532309U CN203532309U CN201320584476.5U CN201320584476U CN203532309U CN 203532309 U CN203532309 U CN 203532309U CN 201320584476 U CN201320584476 U CN 201320584476U CN 203532309 U CN203532309 U CN 203532309U
- Authority
- CN
- China
- Prior art keywords
- pump shaft
- pump
- flange
- low pressure
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model discloses a low pressure safety-injection pump in the field of nuclear power equipment. The low pressure safety-injection pump comprises a pump base, an outer sleeve body, an inner sleeve body, a pump shaft and a bearing body, wherein the outer sleeve body and the inner sleeve body are connected with each other in a sleeved mode, and the top of the outer sleeve body and the top of the inner sleeve body are simultaneously fixed to the pump base; an upper pump shaft mounting hole is formed in the top of the pump base; the inner sleeve body comprises a flow guide segment, a water outlet segment, a multi-stage flow guide shell, a suction-in segment and a suction-in pipe, the flow guide segment, the water outlet segment, the multi-stage flow guide shell, the suction-in segment and the suction-in pipe are sequentially arranged from top to bottom, and a lower pump shaft mounting hole is formed in the center of the suction-in pipe; the pump shaft stretches into the inner sleeve body from the upper pump shaft mounting hole, and the bottom end of the pump shaft stretches into the lower pump shaft mounting hole; a first water guiding bearing fixed to the bottom of the water outlet segment is arranged between the inner wall of the water outlet segment of the inner sleeve body and the pump shaft; a second water guiding bearing fixed to the bottom of the suction-in pipe is arranged between the lower pump shaft mounting hole of the suction-in pump and the pump shaft; a sand throwing disk located above the first water guiding bearing is further connected to the pump shaft in a sleeved mode, a drainage channel is formed between the bottom face of the sand throwing disk and the top face of the first water guiding bearing, and a rigid coupling is connected to the top end of the pump shaft in a sleeved mode.
Description
Technical field
The utility model relates to a kind of low pressure safety injection pump for nuclear power equipment field in nuclear power equipment field.
Background technique
Low pressure safety injection pump is the important component part of nuclear power station mesolow safety injection system (RIS), so low pressure safety injection pump is one of important safety installation of nuclear power station, is also the key equipment of nuclear power station.Low pressure safety injection pump, it belongs to important core two stage pump, and its shockproof requirements reaches antidetonation IA class.When the major function of low pressure safety injection pump in nuclear power station is in reactor coolant loss of-coolant accident (LOCA) and containment internal steam pipe line breaks or delivery (pipe) line break accident occurs, carry out low pressure peace note, guarantee the safe operation of nuclear power station.
In low pressure safety injection pump, the rotating center of pump shaft must keep stable, in order to guarantee the rotating center of pump shaft in low pressure safety injection pump, in low pressure safety injection pump, be provided with and described pump shaft the first water pilot bearing and the second water pilot bearing, between the first water pilot bearing and the second water pilot bearing and pump shaft, by low pressure safety injection pump institute fed sheet of a media, be lubricated.Owing to conventionally containing boric acid particle in low pressure safety injection pump institute fed sheet of a media, can cause wearing and tearing to the first water pilot bearing and the second water pilot bearing.For wear prevention, low pressure safety injection pump institute fed sheet of a media must could be as the lubricant medium that the first water pilot bearing and the second water pilot bearing are filtered by filtering, while filtering at present, by being socketed in, filter screen on described pump shaft carries out, once filter screen is by boric acid Particle Blocking, the first water pilot bearing and the second water pilot bearing will lose efficacy because can not get the lubricated of lubricant medium.
Model utility content
The purpose of this utility model is in order to overcome the deficiencies in the prior art, a kind of low pressure safety injection pump is provided, it can effectively prevent that the first water pilot bearing and the second water pilot bearing in low pressure safety injection pump will lose efficacy because can not get the lubricated of lubricant medium, and the axial force transmission that pump shaft can be subject to is to motor shaft.
A kind of technological scheme that realizes above-mentioned purpose is: a kind of low pressure safety injection pump, comprise pump seat, outer cylinder body, inner barrel, pump shaft and bearing support, described outer cylinder body and described inner barrel are socketed mutually, and the top of described outer cylinder body and described inner barrel is fixed with described pump seat simultaneously;
The top of described pump seat is provided with pump shaft mounting hole;
Described inner barrel comprises diversion section, water exit end, multilevel deflector shell, suction casing and the suction pipe setting gradually from top to bottom, and the center of described suction pipe is provided with lower pump shaft mounting hole;
Described pump shaft pump shaft mounting hole from described stretches into described inner barrel, and the bottom of described pump shaft is stretched in described lower pump shaft mounting hole;
Between the inwall of the water exit end of described inner barrel and described pump shaft, be provided with first water pilot bearing fixing with described water exit end bottom; Between the lower pump shaft mounting hole of described suction pipe and described pump shaft, be provided with second water pilot bearing fixing with described suction pipe bottom; It is characterized in that:
On described pump shaft, be also socketed with the sand table that gets rid of that is positioned at described the first water pilot bearing top, described in get rid of between the bottom surface of sand table and the end face of described the first water pilot bearing and form drainage channel, the top of described pump shaft is socketed rigid coupling.
Further, in described inner barrel, the fixed base that described water exit end top is fixed with, the end face of described fixed base is provided with boss, described in get rid of sand table bottom surface be provided with groove, making described drainage channel is mazy type drainage channel.
Further, described rigid coupling is divided into pump shaft end coupling, intermediate section coupling and the motor shaft end coupling connecting successively from bottom to up.
Further, described the first water pilot bearing and described the second water pilot bearing are hydrostatic bearing, described the first water pilot bearing and the second water pilot bearing integral body are all made by ZCN-type stainless steel, all scribble the coating of nickel-base alloy or high-abrasive material on the inwall of described the first water pilot bearing and the second water pilot bearing.
Further, the anti-flange of inlet porting on described pump seat, export anti-flange, outward flange, inner flange, the anti-flange of described entrance connects described outward flange by water inlet pipe, and the anti-flange of described outlet connects described inner flange by outlet pipe, and described outward flange connects the top of described outer cylinder body;
The correspondence of two ends up and down of the outer wall of described diversion section is provided with the first upper flange and the first lower flange, the correspondence of two ends up and down of the outer wall of described water exit end is provided with the second upper flange and the second lower flange, inner flange on described pump seat connects described the first upper flange, and described the first lower flange connects described the second upper flange;
On the outer wall of described diversion section, be distributed with four above the first gussets that connect described the first upper flange and described the first lower flange, on the outer wall of described water exit end, be distributed with four above the second gussets that connect described the second upper flange and the second lower flange, the outer rim of described the first gusset is provided with the first corrosion resistant coating, and the outer rim of described the second gusset is provided with the second corrosion resistant coating.
Further, on described water exit end, around the circumference of described water exit end, be also distributed with four with more than, connect the 3rd gusset of the inwall of described water exit end and the outer wall of described water exit end, the upper limb of described the 3rd gusset is provided with the 3rd corrosion resistant coating.
Further, be also provided with four above circle distribution around described pump seat on described pump seat, connect the 4th gusset of described inner flange and described outward flange, the lower edge of described the 4th gusset is provided with the 4th corrosion resistant coating.
Further, on described pump shaft, be socketed multi-stage impeller and the inducer between described multi-stage impeller and described the second water pilot bearing, between described multi-stage impeller and described inducer, be provided with the inducer axle sleeve being socketed on described pump shaft.
Further, between the upper pump shaft mounting hole of described pump shaft and described pump seat, mechanical seal structure is set, described mechanical seal structure comprises: be socketed in the nockbush on described upper mounting hole inwall and be socketed in the sealing axle sleeve on described pump shaft outer wall, screw machine sealing is set on the outer wall of described sealing axle sleeve, between described screw machine sealing and described nockbush, forms the seal face of described mechanical seal structure.
Further, described pump bearing body comprises the bearing support fixing with described pump seat top, on the outer wall of described bearing support, along the circle distribution of described bearing support, has heat radiation gusset, and outer rim and the end face of every described heat radiation gusset are provided with wear resistant coating.
Adopted the technological scheme of a kind of low pressure safety injection pump of the present utility model, it is the first water pilot bearing being provided with between the water exit end of inner barrel and pump shaft with pump shaft socket, the bottom of pump shaft is socketed with the second water pilot bearing of the lower pump shaft mounting hole radially inner side of the suction pipe that is positioned at inner barrel, on pump shaft the end face of a fixedly sleeved water exit end that is positioned at inner barrel directly over get rid of sand table, get rid of between the bottom surface of sand table and the end face of water exit end and form drainage channel, the technological scheme of the top socket rigid coupling of pump shaft.Its technique effect is: drainage channel can be because of boric acid Particle Blocking contained in the transmission medium being transmitted by low pressure safety injection pump, therefore the transmission medium of low pressure safety injection pump transmission can be lubricated the first water pilot bearing and the second water pilot bearing, guarantee that the first water pilot bearing and the second water pilot bearing can not lose efficacy because of lack of water, the axial force transmission simultaneously pump shaft being subject to is to motor shaft.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of a kind of low pressure safety injection pump of the present utility model.
Fig. 2 is the enlarged diagram of the A part of Fig. 1.
Fig. 3 is the enlarged diagram of the B part of Fig. 1.
Fig. 4 is the enlarged diagram of the C part of Fig. 1.
Fig. 5 is the first water guide bearing structure schematic diagram of a kind of low pressure safety injection pump of the present utility model.
Fig. 6 is the structural representation of a H shape groove on the first water pilot bearing.
Fig. 7 is the second water guide bearing structure schematic diagram of a kind of low pressure safety injection pump of the present utility model.
Fig. 8 is the structural representation of the 2nd H shape groove on the second water pilot bearing.
Fig. 9 is the structural representation of the inducer of a kind of low pressure safety injection pump of the present utility model.
Figure 10 is the perspective view of the inducer of a kind of low pressure safety injection pump of the present utility model.
Embodiment
To refer to Fig. 1 to Figure 10, in order understanding the technical solution of the utility model better, below by embodiment particularly, and to be described in detail by reference to the accompanying drawings:
Refer to Fig. 1, a kind of low pressure safety injection pump of the present utility model comprises: pump seat 1, outer cylinder body 2, inner barrel 3, pump shaft 4 and bearing support 5.
The anti-flange 11 of inlet porting on pump seat 1, export anti-flange 12, outward flange 13, inner flange 14.The anti-flange 11 of entrance connects outward flange 13 by water inlet pipe 15, exports anti-flange 12 and connects inner flange 14 by outlet pipe 16.Outlet pipe 16 runs through water inlet pipe 15.The top of pump seat 1 is provided with the upper pump shaft mounting hole 17 that connects into water pipe 15 and outlet pipe 16.
In the present embodiment, water inlet pipe 15 enters water by anti-flange 11 levels of entrance, and outlet pipe 16 is by the horizontal water outlet of the anti-flange 12 of outlet, and the angle that water inlet pipe 15 levels enter between water direction and the horizontal water outlet direction of outlet pipe 16 is 90 degree.
The top of outer cylinder body 2 is provided with upper flange 21, and outward flange 13 is by bolt, fixing with upper flange 21, makes urceolus 2 fixing with pump seat 1.
The shape of the axial section of diversion section 31, water exit end 32 outer walls is " work " font, the correspondence of two ends up and down that is diversion section 31 outer walls is provided with the first upper flange and the first lower flange, the correspondence of two ends up and down of water exit end 32 outer walls is provided with the second upper flange and the second lower flange, inner flange 14 on pump seat 1 is fixed by the first upper flange of bolt and diversion section 31, and the first lower flange of diversion section 31 is fixed by the second upper flange of bolt and water exit end 32.Thereby pump seat 1 is fixing with inner barrel 3.
The top of multilevel deflector shell 33 is by screw, fixes with the second lower flange of the outer wall bottom of water exit end 32.The top of suction casing 34 outer walls is provided with the 3rd upper flange.The bottom of multilevel deflector shell 33 is fixed by the 3rd upper flange at screw and suction casing 34 outer wall tops.The 3rd upper flange of the second lower flange of water exit end 32 and suction casing 34 is fixing by rod 36.
On the 3rd upper flange of the second lower flange of water exit end 32, suction casing 34 and between suction pipe 35, by return pipe 37, fix.Return pipe 37 is fixing by return pipe support 38 with the 3rd upper flange of suction casing 34.
Like this, diversion section 31, water exit end 32, multilevel deflector shell 33, suction casing 34 and suction pipe 35 are connected as a single entity.Formed inner barrel 3.The effect of rod 36 and return pipe 37 is the rigidity that strengthen inner barrel 3.
One of improvement of a kind of low pressure safety injection pump of the present utility model is the improvement of inner barrel 3,, on the outer wall of diversion section 31, along the circumference of diversion section 31, distributes and connects the first gusset 311 of described the first upper flange and described the first lower flange.The outer rim of every the first gusset 311 is provided with the first corrosion resistant coating 3111.On the outer wall of water exit end 32, along the circumference of water exit end 12, distribute and connect the second gusset 321 of described the second upper flange and described the second lower flange.The outer rim of every the second gusset 321 is provided with the second corrosion resistant coating 3211.The first gusset 311 is identical with the quantity of the second gusset 321, and is odd number or the even number that is more than or equal to four.In the present embodiment, the quantity of the first gusset 311 and the second gusset 321 is eight.
The object that the first gusset 311 and the second gusset 321 are set is: the natural frequency of vibration that effectively improves low pressure safety injection pump, through measuring and calculating, more than after improving like this, the natural frequency of vibration of low pressure safety injection pump has reached 33Hz, than 22 original～28Hz, be significantly improved, meet the proposed standard of nuclear power plant system to the low pressure safety injection pump natural frequency of vibration.The first gusset 311 and the second gusset 321 quantity are more, are more conducive to improve the natural frequency of vibration of low pressure safety injection pump, but can improve the difficulty that its foundry goods is manufactured.The outer rim of every the first gusset 311 is provided with the first corrosion resistant coating 3111, the outer rim of every the second gusset 321 is provided with the second corrosion resistant coating 3211, effect be: prevent that the first gusset 311 and the second gusset 321 from mechanical properties decrease and then cracking occurring under the corrosion of boric acid, thereby extend the working life of low pressure safety injection pump
In addition, water exit end 32 also comprises, is positioned at water exit end 32 inside, around the circle distribution of water exit end 32, and connects the outer wall of water exit end 32 and the 3rd gusset 322 of inwall.The quantity of the 3rd gusset 322 is to be more than or equal to four odd number or even number.On pump seat 1, around the circumference of pump seat 1, distribute and connect the 4th gusset 18 of inner flange 14 and outward flange 13.The quantity of the 4th gusset 18 is to be more than or equal to four odd number or even number.The effect that the 3rd gusset 322 and the 4th gusset 18 are set is: further improve the natural frequency of vibration of low pressure safety injection pump to more than 35Hz.
The lower edge that the upper limb of while the 3rd gusset 322 is provided with the 3rd corrosion resistant coating 3221, the four gussets 18 is provided with the 4th corrosion resistant coating 181.The reason of design is like this: prevent that the 3rd gusset 322 and the 4th gusset 18 from mechanical properties decrease and then cracking occurring under the corrosion of boric acid, thereby extend the working life of low pressure safety injection pump.
In the present embodiment, the quantity of the first gusset 311, the second gusset 321, the 3rd gusset 322 and the 4th gusset 18 is all eight.
In addition, the outer wall of honeycomb duct 31 is provided with the first connection reinforcement gusset 312 that connects any two the first adjacent gussets 311.The outer wall of outlet pipe 32 is provided with the second connection reinforcement gusset 323 of any two the second adjacent gussets 321, to prevent that the position of the first gusset 311 and the second gusset 321 is offset.
No matter the quantity of the first gusset 311, the second gusset 321, the 3rd gusset 322 and the 4th gusset 18 is even number or odd number, can guarantee the stable of low pressure safety injection pump structural behaviour.
In the present embodiment, the material of the first corrosion resistant coating 3111, the second corrosion resistant coating 3211, the three corrosion resistant coating 3211, the second corrosion resistant coatings 3221 and the 4th corrosion resistant coating 181 is nickel-base alloy, and forms by plasma spraying method.
In the present embodiment, also taked the natural frequency of vibration of the technical measures raising low pressure safety injection pump of increase inner flange 14 spiral shell heart distances.In prior art, the spiral shell heart of inner flange 14 distance is 580mm, and in the present embodiment, the spiral shell heart of inner flange 14 is 630mm apart from b.Correspondingly, the spiral shell heart of described the first upper flange, described the first lower flange, described the second upper flange, described the second lower flange and described the 3rd upper flange is apart from the also corresponding 630mm that increases to.Meanwhile, the outward flange 11 of pump seat 1, and the spiral shell heart of the upper flange 21 of outer cylinder body remains unchanged apart from a, is still 1000m.
Meanwhile, the utility model has also increased the internal diameter of multilevel deflector shell 33, further improves the natural frequency of vibration of low pressure safety injection pump, more can improve the conveyance capacity of low pressure safety injection pump.
In the inside of inner barrel 3, between the final stage blower inlet casing in multilevel deflector shell 33 and the inwall of water exit end 12, be provided with spacer 39, be used for strengthening the rigidity of inner barrel 3, and the rotating center of stable pump shaft 4.
On pump shaft 4, be socketed with multi-stage impeller 41, in the present embodiment, multi-stage impeller 41 is provided with three grades of impellers, the first stage impeller setting gradually from bottom to up, secondary impeller and impeller.Described first stage impeller, described secondary impeller and the described impeller position on pump shaft 4 is axial is corresponding one by one with the position of the chopped-off head blower inlet casing in multilevel deflector shell 33, secondary blower inlet casing and final stage blower inlet casing.In the present embodiment, what described first stage impeller, described secondary impeller and described impeller adopted is centrifugal single-stage impeller, between described first stage impeller and described chopped-off head blower inlet casing, between described secondary impeller and described secondary blower inlet casing, and between described impeller and described final stage blower inlet casing, be equipped with front seal ring 411, increasing back sealing ring 412 and equalizing orifice 413.The object of design is like this: the axial force can balance pump shaft 4 being subject to.Between described first stage impeller and described secondary impeller, between described secondary impeller and between described impeller, be equipped with the impeller sleeve 415 being socketed on pump shaft 4.
Described first stage impeller and described chopped-off head blower inlet casing, described secondary impeller and described secondary blower inlet casing, and the outer surface axial cross section of described impeller and described final stage blower inlet casing be shaped as arc.The object of design is to increase the conveyance capacity of low pressure safety injection pump like this.
A kind of low pressure safety injection pump of the present utility model, has also increased the diameter of first stage impeller, secondary impeller and impeller in multi-stage impeller 41, to increase the conveyance capacity of low pressure safety injection pump.
On pump shaft 4, be also socketed with respectively the first water pilot bearing 42, the second water pilot bearings 43 and inducer 44.
Refer to Fig. 3, Fig. 5 and Fig. 6, the first water pilot bearing 42 pump shaft 4 and water exit end 12 radially between, the bottom of the first water pilot bearing 42 by bolt, is fixed with the bottom of water exit end 32.Refer to Fig. 3 and Fig. 7, the second water pilot bearing 43 pump shaft 4 and lower pump shaft mounting hole 352 radially between.The bottom of the bottom of the second water pilot bearing 43 and suction pipe 35 is bolted.The effect of the first water pilot bearing 42 and the second water pilot bearing 43 is: support pump shaft 4, stablize the rotating center of pump shaft 4.
The integral body of the first water pilot bearing 42 and the second water pilot bearing 43 is all made by Z2CN18-10 type stainless steel, and this stainless steel is exclusively used in nuclear power field.The inwall of the first water pilot bearing 42 and the second water pilot bearing 43 is provided with the coating of nickel-base alloy or other high-abrasive material, and in the present embodiment, preferably Ni60 piles welding coat.The reason of design is like this: Ni60 is the nickel chromium triangle borosilicate alloy of high hardness, have wear-resisting, the feature such as corrosion-resistant, high temperature resistant, can meet under the conditions such as startup and parking transient state, cold water operation, hot water operation, hot transient state, small flow, impure water running, there is not the requirement of wearing and tearing in the first water pilot bearing 42 and the second water pilot bearing 43.
As shown in Figure 5, the bottom of the first water pilot bearing 42 is fixed with the first water pilot bearing seat 420, for the first water pilot bearing 42 is fixing with the water exit end 32 of inner barrel 3.On the end face of the first water pilot bearing 42, have axial diversion hole 423,423, five, five axial diversion holes around the circle distribution of the first water pilot bearing 42.On the circumference of the inwall of the first water pilot bearing 42, five are provided with a H shape groove 422, and each H shape Cao422 center is equipped with radial guiding discharge orifice 421, and radial guiding discharge orifice 421 connects correspondingly mutually with axial diversion hole 423.In addition, the top of the inwall of the first water pilot bearing 42 is provided with overcurrent ring 424, and the upper radial guiding opening 425 being communicated with upper overcurrent ring 424.The bottom of the inwall of the first water pilot bearing 42 is provided with lower overcurrent ring 426, and the lower radial guiding opening 427 being communicated with lower overcurrent ring 426.On the outer wall of the first water pilot bearing 42, also have the guiding gutter 428 that connects upper radial guiding opening 425 and lower radial guiding opening 427.
As shown in Fig. 2, Fig. 7 and Fig. 8, the bottom of the second water pilot bearing 43 is provided with the second water pilot bearing seat 430, for the second water pilot bearing 43 and the bottom of suction pipe 35 are fixed.Five the 2nd H shape grooves 431432 that distribute on the inwall of the second water pilot bearing 43, each the 2nd H shape Cao432 center is equipped with middle part radial guiding opening 431.
The object of design is like this: utilize the pressure of low pressure safety injection pump transmission medium to make the first water pilot bearing 42 and the second water pilot bearing 43 become hydrostatic bearing, guarantee that pump shaft 4 is in rotating center stable, improve the bearing capacity of the first water pilot bearing 42 and the second water pilot bearing 43, guarantee the performability of low pressure safety injection pump.
On water exit end 32, be also provided with some top backflow through holes 323 around water exit end 32 circumference, one end of backflow through hole 324 is communicated with return pipe 37 on described the second lower flange simultaneously, and one end is on the top of water exit end 32 inwalls in addition.Suction pipe 35 is provided with bottom backflow through hole 353, bottom backflow through hole 353 is the radial direction through hole that are positioned at suction pipe 35 bottoms, top backflow through hole 324, return pipe 37 and bottom backflow through hole 353 are realized the transmission medium of low pressure safety injection pump, i.e. the backflow of lubricant medium between the first water pilot bearing 42 and the second water pilot bearing 43.
Simultaneously, as shown in Figures 2 and 3, the inner side of the inner side of the first water pilot bearing 42 and the second water pilot bearing 43, correspondence is provided with the first water pilot bearing axle sleeve 429 and the second water pilot bearing axle sleeve 439 being socketed on pump shaft 4, to guarantee that in low pressure safety injection pump running pump shaft 4 is not by the lubricant medium that the inner side of the first water pilot bearing 42 and the second water pilot bearing 43 are lubricated, and the wearing and tearing of the impurity in the transmission medium of low pressure safety injection pump.
Refer to Fig. 9 and Figure 10, the position of inducer 44 is between the first stage impeller and the second water pilot bearing axle sleeve 439 of multi-stage impeller 41. and between inducer 44 and first stage impeller, be provided with and be socketed in inducer axle sleeve 440 on pump shaft 4, such design has reduced the axial length of inducer 44, and the difficulty of processing of inducer 4 reduces greatly.
In low pressure safety injection pump, the effect of inducer 44 is: improve medium that low pressure safety injection pump transmits suffered pressure when the first stage impeller by multi-stage impeller 41, guarantee the installation requirement of low pressure safety injection pump in nuclear power station, there is not the requirement of cavitation in the multi-stage impeller 41 that simultaneously meets this low pressure safety injection pump under full performance operating mode.
In addition in the utility model, inducer 44 is foundry goods, with this, replaces original forging; And owing to being provided with inducer axle sleeve 440 between inducer 44 and the first stage impeller of multi-stage impeller 41, so the length of the wheel hub 441 of inducer 44 changes present 302mm into by original 435mm.Thereby only need to use general lathe just can process inducer used in the present embodiment 44.And spiral vane 4421 also can obtain the same surface roughness of employing five-axis NC machine center after polishing.
The first water pilot bearing 42 communicates with the impeller outlet of described impeller by the equalizing orifice with described impeller; The second water pilot bearing 43 of inducer 44 lower ends communicates with the import of the outer rim 442 of inducer 44, between such the first water pilot bearing 42 and the second water pilot bearing 43, has just formed certain pressure reduction.The medium that low pressure safety injection pump just can adopt low pressure safety injection pump to carry is lubricated the first water pilot bearing 42 and the second water pilot bearing 43.By return pipe 37, realize the circulation of lubricant medium simultaneously.
Although the structure of the first water pilot bearing 42, the second water pilot bearing 43 and inducer 44 has all been made significant improvement in the utility model.Yet the first water pilot bearing 42, impeller 41, inducer 44 and the Placement of the second water pilot bearing 43 on pump shaft 4, and the structure of impeller 41 still belongs to prior art.
On pump shaft 4, the first water pilot bearing axle sleeve 429, multi-stage impeller 41, inducer axle sleeve 440, inducer 44 and the second water pilot bearing axle sleeve 439 be all by key and pump shaft 4 axial restraints.The bottom of pump shaft 4, on the pump shaft 4 of the second water pilot bearing 43 belows, Support cushion 471, dish spring 472, bottom nut 473 and bottom nut pad 474 are set, the first water pilot bearing axle sleeve 429, multi-stage impeller 41, inducer axle sleeve 440, inducer 44 and the second water pilot bearing axle sleeve 439 are played to position-limiting action.Dish spring 472 can also be when thermal shock operating mode simultaneously, and the STRESS VARIATION that the dimensional changes that each part being socketed on elimination pump shaft 4 produces due to thermal expansion causes prevents that pump shaft 4 locking inefficacies from waiting the generation of dangerous situation.As shown in Figure 2.
The medium transmitting due to low pressure safety injection pump is the solution of radiating medium, contains the particle of a large amount of radiating mediums in transmission medium.The particle diameter of these particles, in 2.1mm left and right, could be lubricated the first water pilot bearing 42 and the second water pilot bearing 43 after these particles must filter.
Refer to Fig. 3, in inner barrel 3, the top of the inwall of water exit end 32 is also fixed with fixed base 325, the outlet of backflow through hole 323 on top that is positioned at the inwall of water exit end 12 is that the inner circumference around fixed base 325 arranges, to allow the transmission medium of low pressure safety injection pump transmission circulate between the first water pilot bearing 42 and the second water pilot bearing 43, the first water pilot bearing 42 and the second water pilot bearing 43 are lubricated.
On pump shaft 4, also fixedly sleeved one is got rid of sand table 45, gets rid of the top that sand table 45 is positioned at fixed base 325, gets rid of between the bottom surface of sand table 45 and fixed base 325 and forms drainage channel 40.The transmission medium of low pressure safety injection pump transmission, by drainage channel 40, flows into the gap between the first water pilot bearing 42 and the second water pilot bearing 43 and pump shaft 4, and the first water pilot bearing 42 and the second water pilot bearing 43 are lubricated.
The object of design is like this: get rid of sand table 45 and rotate with pump shaft 4, the impurity particle that is greater than drainage channel 40 diameters cannot enter in drainage channel 40, and being less than the impurity of drainage channel 40 diameters, particle diameter enters after drainage channel 40, can be along with getting rid of sand table 45 together around pump shaft 4 rotations, under centrifugal action, these impurity are thrown out of, so just can not cause drainage channel 40 blocked, the first water pilot bearing 42 and the second water pilot bearing 43 can not lose efficacy because of lack of water yet.
Owing to being provided with a boss on fixed base 325 end faces, and the bottom surface of getting rid of sand table 45 is provided with groove, so drainage channel 40 forms mazy type drainage channels, contributes to like this to promote the filtering effect of drainage channel 40.
Refer to Fig. 4, between the upper pump shaft mounting hole 17 of pump shaft 4 and pump seat 1, be also provided with mechanical seal structure 6, mechanical seal structure 6 comprises the integrated mechanical sealing 60 being socketed on pump shaft 4, be socketed in the nockbush 61 on upper pump shaft mounting hole 17 hole walls of pump seat 1 and be socketed in the sealing axle sleeve 62 on pump shaft 4 outer walls, nockbush 61 and sealing axle sleeve 62 are all positioned at integrated mechanical sealing 60 belows; The effect of integrated mechanical sealing 60 is that the transmission medium that prevents the transmission of low pressure safety injection pump runs off from the top of low pressure safety injection pump.Nockbush 61 and sealing axle sleeve 62 are socketed mutually; The outer wall of sealing axle sleeve 62 is provided with screw machine sealing 63.Sealing axle sleeve 62 is fixing by sealing axle sleeve nut 64 and sealing axle sleeve pad 65.Between upper pump shaft mounting hole 17, nockbush 61 and the sealing axle sleeve 62 of integrated mechanical sealing 60, pump seat 1, form machine sealing chamber 66, the technique effect that the mechanical seal structure 6 playing dispels the heat.
The object of design is like this: low pressure safety injection pump utilizes the transmission medium of self transmission as flushing medium, the screw machine sealing 63 in mechanical seal structure 6 to be rinsed, this flushing medium must be through the effect of cyclone hydraulic separators, just can enter the seal face of screw machine sealing 63, screw machine sealing 63 is rinsed.Because cyclone hydraulic separators can be removed the impurity particle in this flushing medium, with regard to having prevented the impurity particle in flushing medium from entering screw machine sealing 63, cause mechanical seal structure 6 to lose efficacy like this.From exporting anti-flange 12 diversions to cyclone hydraulic separators, cyclone hydraulic separators is by after the particle removal in medium, the flushing medium of removing impurity is introduced to mechanical seal structure 6, rinse the seal face of screw machine sealing 63, the impurity of cyclone hydraulic separators filtering is arranged and is entered the anti-flange 11 of entrance.Cyclone hydraulic separators is the external equipment of low pressure safety injection pump, does not belong to a part for low pressure safety injection pump.
The another one effect of sealing axle sleeve nut 64 and sealing axle sleeve pad 65 is: the leakage rate that can effectively limit flushing medium when mechanical seal structure 6 lost efficacy, and the continuation that does not affect low pressure safety injection pump moves, and alleviate because low pressure safety injection pump leaks the environmental nuisance causing.
Simultaneously.The top socket rigid coupling 48 of pump shaft, is used for pump shaft 4 to be connected with motor shaft, and the axial force transmission that rigid coupling 48 can be subject to pump shaft 4 is on motor shaft (not shown).Cased muff coupling 48 is divided into again pump shaft end coupling 481, intermediate shaft coupling 482 and motor shaft end coupling 483 simultaneously.Pump shaft end coupling 481 is fixed by the top of screw and pump shaft 4.Middle end coupling 482 connects pump shaft end coupling 481 and motor shaft end coupling 483.Motor shaft end coupling 483 is fixed with motor shaft (not shown).The installation of rigid coupling 48 is convenient in such design.
Bearing support 5 is positioned at the top of this low pressure safety injection pump, comprising: be fixed on the bearing support 51 on pump seat 1 top, be provided with bearing mounting hole 511 in bearing support 51, bearing mounting hole 511 and pump shaft 4 sockets.Between pump shaft 4 and bearing mounting hole 511, be provided with the bearing axle sleeve 46 being socketed on pump shaft 4.On the hole wall of bearing mounting hole 511, be fixed with bearing 52.Here the bearing 52 that adopted is double-row angular contact bal bearing.Bearing 52 has improved two specifications than originally, so bearing 52 can bear larger load, and heating value reduces.In addition on the one hand on the outer wall of bearing support 51, along the circle distribution of bearing support 51, there is heat radiation gusset 512.The surface area of monolithic heat radiation gusset 521 increases to present 600 square centimeters by original 310 square centimeters, to accelerate the heat radiation of bearing 52, lowers the temperature on bearing 52 surfaces, reduces the wearing and tearing of bearing 52.Meanwhile, the top of bearing support 51 is provided with in lubricating cup 53, and bearing 52 is carried out to autonomous oil lubrication.Meanwhile, below bearing support 5, be also provided with the dust pan 49 being socketed on pump shaft 4, to prevent that dust from entering bearing support 5, and inner barrel 3.Meanwhile, outer rim and the end face of every heat radiation gusset 512 are provided with wear resistant coating 5121, to prevent splitting and damaging of radiating fin plate 512.The material of wear resistant coating 5121 is aluminium oxide or zirconium oxide, and forms by plasma spraying method.
The seal clearance of bearing axle sleeve 46 and the first water pilot bearing axle sleeve 429, the second water pilot bearing axle sleeve 439, inducer axle sleeve 440, impeller sleeve 415 and pump shaft 4 cooperation places is greater than the distortion of accident conditions rotor part and mating parts, guarantee that each parts on pump shaft 4 are in the set a record great earthquake of earthquake intensity of SSE(nuclear power station location) during and after with inner barrel 3, pump seat 1 and bearing support 5 on each parts can not rub with pump shaft 4, the safe operation of assurance low pressure safety injection pump.
The fastening pieces such as all bolts that use on a kind of low pressure safety injection pump in the utility model in addition,, double-screw bolt all adopt locked spacer locking.Guaranteed under any operating mode, the connection between each parts of low pressure safety injection pump can be because of vibration Loose invalidation.
The transmission medium of low pressure safety injection pump flows into low pressure safety injection pump from the anti-flange 11 of entrance, be full of the outer chamber between inner barrel 3 and outer cylinder body 2, transmission medium in outer chamber, suction pipe 35 through inner barrel 3 bottoms enters inner barrel 3, under the effect of inducer 44 and multi-stage impeller 41, along the interior rising of inner barrel 3, finally from exporting anti-flange 12, discharge low pressure safety injection pump.To pump shaft 4 and the first water pilot bearing 42, between pump shaft 4 and the second water pilot bearing 43, be lubricated simultaneously.
Those of ordinary skill in the art will be appreciated that, above embodiment is only for the utility model is described, and be not used as restriction of the present utility model, as long as within the scope of connotation of the present utility model, to above embodiment's variation, modification, all will drop within the scope of claims of the present utility model.
Claims (10)
1. a low pressure safety injection pump, comprise pump seat (1), outer cylinder body (2), inner barrel (3), pump shaft (4) and bearing support (5), described outer cylinder body (2) and described inner barrel (3) are socketed mutually, and the top of described outer cylinder body (2) and described inner barrel (3) is simultaneously fixing with described pump seat (1);
The top of described pump seat (1) is provided with pump shaft mounting hole (17);
Described inner barrel (3) comprises diversion section (31), water exit end (32), multilevel deflector shell (33), suction casing (34) and the suction pipe (35) setting gradually from top to bottom, and the center of described suction pipe (35) is provided with lower pump shaft mounting hole (352);
Described pump shaft (4) pump shaft mounting hole (17) from described stretches into described inner barrel (3), and the bottom of described pump shaft (4) is stretched in described lower pump shaft mounting hole (352);
Between the inwall of the water exit end (32) of described inner barrel (3) and described pump shaft (4), be provided with first water pilot bearing (42) fixing with described water exit end (32) bottom; Between the lower pump shaft mounting hole (352) of described suction pipe (35) and described pump shaft (4), be provided with second water pilot bearing (43) fixing with described suction pipe (35) bottom; It is characterized in that:
On described pump shaft (4), be also socketed be positioned at described the first water pilot bearing (42) top get rid of sand table (45), described getting rid of between the bottom surface of sand table (45) and the end face of described the first water pilot bearing (429) forms drainage channel (40), the top socket rigid coupling (48) of described pump shaft (4).
2. a kind of low pressure safety injection pump according to claim 1, it is characterized in that: in described inner barrel (3), the fixed base (324) that described water exit end (32) top is fixed with, the end face of described fixed base (324) is provided with boss, described bottom surface of getting rid of sand table (324) is provided with groove, and making described drainage channel (40) is mazy type drainage channel.
3. a kind of low pressure safety injection pump according to claim 1, is characterized in that: described rigid coupling (48) is divided into pump shaft end coupling (481), intermediate section coupling (482) and the motor shaft end coupling (483) connecting successively from bottom to up.
4. a kind of low pressure safety injection pump according to claim 1, it is characterized in that: described the first water pilot bearing (42) and described the second water pilot bearing (43) are hydrostatic bearing, described the first water pilot bearing (42) and the second water pilot bearing (43) are whole all to be made by Z2CN18-10 type stainless steel, all scribbles the coating of nickel-base alloy or high-abrasive material on the inwall of described the first water pilot bearing (42) and the second water pilot bearing (43).
5. a kind of low pressure safety injection pump according to claim 1, it is characterized in that: described pump seat (1) is gone up the anti-flange of inlet porting (11), exported anti-flange (12), outward flange (13), inner flange (14), the anti-flange of described entrance (11) connects described outward flange (13) by water inlet pipe (15), the anti-flange of described outlet (12) connects described inner flange (14) by outlet pipe (16), and described outward flange (13) connects the top of described outer cylinder body (2);
The correspondence of two ends up and down of the outer wall of described diversion section (31) is provided with the first upper flange and the first lower flange, the correspondence of two ends up and down of the outer wall of described water exit end (12) is provided with the second upper flange and the second lower flange, inner flange (14) on described pump seat (1) connects described the first upper flange, and described the first lower flange connects described the second upper flange;
On the outer wall of described diversion section (31), be distributed with four above the first gussets (311) that connect described the first upper flange and described the first lower flange, on the outer wall of described water exit end (32), be distributed with four above the second gussets (321) that connect described the second upper flange and the second lower flange, the outer rim of described the first gusset (311) is provided with the first corrosion resistant coating (3111), and the outer rim of described the second gusset (321) is provided with the second corrosion resistant coating (3211).
6. a kind of low pressure safety injection pump according to claim 5, it is characterized in that: on described water exit end (12), circumference around described water exit end (32), also be distributed with four with more than, the 3rd gusset (322) that connects the inwall of described water exit end (32) and the outer wall of described water exit end (32), the upper limb of described the 3rd gusset (322) is provided with the 3rd corrosion resistant coating (3221).
7. a kind of low pressure safety injection pump according to claim 6, it is characterized in that: on described pump seat (1), be also provided with four above circle distribution around described pump seat (1), the 4th gusset (18) that connects described inner flange (14) and described outward flange (13), the lower edge of described the 4th gusset (18) is provided with the 4th corrosion resistant coating (181).
8. a kind of low pressure safety injection pump according to claim 1, it is characterized in that: described pump shaft (4) upper socket multi-stage impeller (41) and be positioned at described multi-stage impeller (41) and described the second water pilot bearing (43) between inducer (44), between described multi-stage impeller (421) and described inducer (44), be provided with the inducer axle sleeve (440) being socketed on described pump shaft (4).
9. a kind of low pressure safety injection pump according to claim 1, it is characterized in that: between described pump shaft (4) and the upper pump shaft mounting hole (17) of described pump seat (1), mechanical seal structure (6) is set, described mechanical seal structure (6) comprising: be socketed in the nockbush (61) on described upper mounting hole (17) inwall and be socketed in the sealing axle sleeve (62) on described pump shaft (4) outer wall, screw machine sealing (63) is set on the outer wall of described sealing axle sleeve (62), between described screw machine sealing (63) and described nockbush (61), form the seal face of described mechanical seal structure (6).
10. a kind of low pressure safety injection pump according to claim 1, it is characterized in that: described pump bearing body (5) comprises the bearing support (51) fixing with described pump seat (1) top, on the outer wall of described bearing support (51), circle distribution along described bearing support (51) has heat radiation gusset (512), and the outer rim of every described heat radiation gusset (51) and end face are provided with wear resistant coating (5121).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320584476.5U CN203532309U (en) | 2013-09-22 | 2013-09-22 | Low pressure safety-injection pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320584476.5U CN203532309U (en) | 2013-09-22 | 2013-09-22 | Low pressure safety-injection pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203532309U true CN203532309U (en) | 2014-04-09 |
Family
ID=50418522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320584476.5U Expired - Lifetime CN203532309U (en) | 2013-09-22 | 2013-09-22 | Low pressure safety-injection pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203532309U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104005963A (en) * | 2014-05-23 | 2014-08-27 | 哈尔滨电气动力装备有限公司 | Main pump structure for small nuclear power plant |
| CN104240775A (en) * | 2014-09-09 | 2014-12-24 | 张志雄 | Nuclear reactor flange copper alloy aluminum oxide high-pressure cooling device |
| CN110185625A (en) * | 2019-05-17 | 2019-08-30 | 陕西科技大学 | A kind of liquefied ammonia delivery pump |
-
2013
- 2013-09-22 CN CN201320584476.5U patent/CN203532309U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104005963A (en) * | 2014-05-23 | 2014-08-27 | 哈尔滨电气动力装备有限公司 | Main pump structure for small nuclear power plant |
| CN104240775A (en) * | 2014-09-09 | 2014-12-24 | 张志雄 | Nuclear reactor flange copper alloy aluminum oxide high-pressure cooling device |
| CN110185625A (en) * | 2019-05-17 | 2019-08-30 | 陕西科技大学 | A kind of liquefied ammonia delivery pump |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203532309U (en) | Low pressure safety-injection pump | |
| CN102606484A (en) | Charging pump for nuclear power station | |
| CN104179689B (en) | Draw-out type vertical-shaft pump | |
| CN102606537A (en) | Containment spray pump | |
| CN201714679U (en) | Condensate pump for million-kilowatt super-critical thermal power generating unit | |
| CN104976133B (en) | A kind of high-temperature water pump of the mechanical seal with Vortex pump enclosed self-circulation system | |
| CN202597113U (en) | Charging pump for nuclear power station | |
| CN103195738B (en) | A kind of residual heat removal pump | |
| CN205478344U (en) | Avionics cooling water pump for nuclear power station | |
| CN202597250U (en) | Spray pump for containment vessel | |
| CN105240279A (en) | Reverse osmosis sea water desalination booster pump | |
| CN103195759A (en) | Main feed pump | |
| CN104265639A (en) | Gear speed increasing assembly type high speed rotating casing pump unit | |
| CN208277742U (en) | A kind of hub unit with abs sensor mechanism | |
| CN105909526A (en) | Radial dissection two-end support type four-stage centrifugal pump | |
| CN203257721U (en) | Main water-feeding pump | |
| CN205841221U (en) | Three generations's million kilowatt and gigawatt dilatation level nuclear power generating sets condensate pump | |
| CN202510422U (en) | High-flow high-pressure centrifugal fan | |
| CN206280261U (en) | Coaxial-type horizontal multi-stage centrifugal pump | |
| CN203655646U (en) | Vertical condensate pump provided with balance device | |
| CN202811490U (en) | Nuclear secondary pump containment vessel spraying pump for 300 MW nuclear power station | |
| CN207989392U (en) | Vertical centrifugal pump | |
| CN207145260U (en) | A kind of new cut-up type blow-down pump | |
| CN201925233U (en) | Equipment cooling pump for nuclear power station | |
| CN215830788U (en) | High cavitation condensate pump |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140409 |