CN105240309B - Nuclear reactor coolant pump and its passive parking seal assembly - Google Patents
Nuclear reactor coolant pump and its passive parking seal assembly Download PDFInfo
- Publication number
- CN105240309B CN105240309B CN201410664722.7A CN201410664722A CN105240309B CN 105240309 B CN105240309 B CN 105240309B CN 201410664722 A CN201410664722 A CN 201410664722A CN 105240309 B CN105240309 B CN 105240309B
- Authority
- CN
- China
- Prior art keywords
- ring
- sealing ring
- seal assembly
- reactor coolant
- sealing
- 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.)
- Active
Links
- 239000002826 coolant Substances 0.000 title claims abstract description 108
- 238000007789 sealing Methods 0.000 claims abstract description 186
- 230000003068 static effect Effects 0.000 claims description 18
- 210000004907 gland Anatomy 0.000 claims description 17
- 238000003780 insertion Methods 0.000 claims description 12
- 230000037431 insertion Effects 0.000 claims description 12
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 11
- 229920002530 polyetherether ketone Polymers 0.000 claims description 11
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 claims description 9
- 230000002706 hydrostatic effect Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 6
- 230000000712 assembly Effects 0.000 claims description 6
- 238000000429 assembly Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 4
- 241000283216 Phocidae Species 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 102000004954 Biglycan Human genes 0.000 description 1
- 108090001138 Biglycan Proteins 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 229910001285 shape-memory alloy Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/14—Shaft sealings operative only when pump is inoperative
Abstract
The invention discloses a kind of nuclear reactor coolant pump and its passive parking seal assembly.Passive parking seal assembly includes sealing ring, tightening ring and fusible support block；Sealing ring is split ring, and under nominal situation, sealing ring keeps gap with opening around pump shaft and with pump shaft；Tightening ring is enclosed on the periphery wall of sealing ring, its under station blackout operating mode to sealing ring provide it is enough big ground enclasping force, drive sealing ring close holding pump shaft；Fusible support block is in the opening of sealing ring or tightening ring, and ring is closed and ensures that sealing ring is in opening where it is prevented in normal conditions, and fusing is failed and sealing ring is closed in the presence of tightening ring under station blackout operating mode.Compared with prior art, passive parking seal assembly of the present invention only has three elements, axle envelope integrity demands that can not only be when meeting station blackout operating mode under conditions of independent of emergent axle envelope injected system, and with the advantages of simple in construction, sealing is firm.
Description
Technical field
The invention belongs to nuclear power field, it is more particularly related to a kind of nuclear reactor coolant pump and its non-energy
Dynamic stop seal component.
Background technology
In PWR nuclear power plant, reactor coolant pump is generally referred to as main pump, hydrostatic pressure axle envelope type main pump be by
The single-stage of triphase induction type motor driving, single suction, vertical mixed flow pump.Fig. 1 is a kind of knot of existing nuclear reactor coolant pump
Structure schematic diagram, it is made up of motor 10, static pressure gland seal assembly 12 and hydraulic part 14 successively from top to bottom, and pump shaft is through whole
The center of main pump；Reactor coolant is pumped by an impeller mounted in pump shaft lower end, and it is sucked and upward by pump case bottom
Impeller is flowed through, is then taken over and discharged by the one outlet of stator and pump case side.
Referring to Fig. 2, the static pressure gland seal assembly 12 in main pump uses three-level axle envelope, including it is successively set on hydraulic part 14
The first seal assembly 15, the second seal assembly 16 and the 3rd seal assembly 17 between motor 10；Three seal assemblies 15,
16th, 17 it is arranged on the circumference of pump shaft 18 and is axially arranged in order along pump shaft 18, the first seal assembly 15 and the second seal assembly 16
Outside is additionally provided with capsul 19.Wherein, the first seal assembly 15 is the sealing of balanced type Hydrostatic die mould controllable leak, and second seals
Component 16 is pressure-balancing type end face seal, and the 3rd seal assembly 17 is weir formula double seals.
Referring to Fig. 3, the first seal assembly 15 includes being successively set between the seal assembly 16 of hydraulic part 14 and second
Rotating ring 150, stationary ring 152, sealing insert 154 and sealing insertion support member 156；Seal insert 154 and sealing insertion branch
Gap be present between pump shaft 18 in the inwall of support member 156；Rotating ring 150 is fixed on pump shaft 18 and rotated with pump shaft 18, stationary ring
152 do not rotate but can slightly be moved up and down along the axial direction of pump shaft 18 or incline direction, to keep appropriate gap with rotating ring 150.
Under accidental conditions, stationary ring 152 is controlled between keeping minimum between rotating ring 150, stationary ring 152 by hydrostatic equilibrium
Gap forms liquid film, 152 two rotating ring 150, stationary ring end faces is not connect directly in the relative slip in one layer of thin water film both sides, operating
Touch, so as to control the leakage rate and wear extent of the first seal assembly 15.It is furnished with O shapes between stationary ring 152 and adjacent structural member
Ring and auxiliary element, to form the auxiliary seal of a slip between higher-pressure region and low-pressure area.
Under accidental conditions, the cooling of the first seal assembly 15 is by RCV systems (Chemical and Volume
Control System, i.e. chemistry and volume control system) the injection water that provides ensures.But under station blackout operating mode,
RCV systemic-functions can be lost and can not provide normal cooling for the static pressure gland seal assembly 12 in main pump, meanwhile, RRI systems
The function of (Equipment Cooling Water System, i.e. component cooling water system) can also be lost, and can not be in main pump
The first seal assembly 15 standby cooling is provided.Now, the high temperature fluid of primary Ioops (referring to reactor coolant loop major loop)
The first seal assembly 15 will be threatened quickly, and its thermal stress may lose main pump axle envelope function, so as to destroy primary Ioops pressure
Border.
Therefore, part nuclear power plant passes through hydraulic testpump diesel generating set (LLS systems after the generation of station blackout operating mode
System) powered to the hydraulic testpump of primary Ioops, to ensure that hydraulic testpump to the emergent water filling of main pump axle envelope, maintains the first sealing group
Cooling and lubrication at part 15, while high-temperature high-voltage reaction reactor coolant is limited in the lower section of the first seal assembly 15, ensure the
Temperature at one seal assembly 15 prevents main pump axle envelope cut accident (Seal LOCA) from occurring in the range of its service requirement,
Ensure the integrality of primary Ioops pressure boundary.But because existing nuclear power plant is mostly double heap arrangements, two units share a water
Test pump is pressed, also only considers that the loss of power accident occurs for single unit in design, therefore the nominal flow capacity of hydraulic testpump is 6m3/
H, it is only capable of the axle envelope water injection rate demand for meeting 3 main pumps of a unit；This causes in station blackout operating mode, in addition a machine
The emergent axle envelope injection of the main pump of group can not ensure and axle envelope cut accident occurs；After all moisturizing means are lost, one time
The leakage on road can not be supplemented, and water loading amount cannot be guaranteed, and will make it that reactor core is gradually exposed and finally melts.
In order to solve the above problems, some nuclear power plants propose to reveal approach by capping reactor coolant to ensure reactor core
Safety, with the dependence for the axle envelope injected system that avoids meeting an urgent need to main pump under station blackout operating mode.Under station blackout operating mode, main pump
High-temperature, high pressure fluid flow direction at first seal assembly 15 is as shown in Fig. 4 arrow, it can be seen that limited reactions
The key that reactor coolant leaks to environment is to seal two important sealing stations 20,22.Existing part nuclear power plant
Have started to ensure using passive parking Sealing Technology the integrality of main pump axle envelope, its concrete operations mode is：1) directly exist
Increase passive parking seal assembly 24 in the sealing insert 154 of the first seal assembly of main pump 15, to realize the first sealing position
Put the sealing at 20；2) using high-temperature resistant rubber O circle 26, realize at the second sealing station 22 (i.e. sealing insertion support member 156 with
Between capsul 19) sealing.But existing passive parking seal assembly 24 mostly element is numerous and assembling is complicated, no
Only so that gland seal assembly manufacture difficulty and added cost, and it is easy to cause sealing to be lost because of some or multiple element failure
Effect.
In view of this, it is necessory to provide, one kind is simple in construction, the firm nuclear reactor coolant pump of sealing is passive stops
Car seal assembly.
The content of the invention
It is an object of the invention to：A kind of simple in construction, firm nuclear reactor coolant pump of sealing and its non-energy are provided
Dynamic stop seal component, to improve the reliability of main pump axle envelope, prevent in the case of axle envelope injected system of being met an urgent need independent of main pump
The only generation of main pump axle envelope cut accident.
In order to realize foregoing invention purpose, the invention provides a kind of nuclear reactor coolant pump passive parking sealing group
Part, it includes sealing ring, tightening ring and fusible support block；The sealing ring is the split ring of adjustable internal diameter, under nominal situation,
Sealing ring keeps gap with opening around nuclear reactor coolant pump pump shaft and with pump shaft, reactor coolant is existed
Flowed freely between sealing ring and pump shaft；Tightening ring is enclosed on the periphery wall of sealing ring, and it can under station blackout operating mode
Apply enclasping force enough bigly to sealing ring, drive sealing ring to close and hold pump shaft tightly；Fusible support block is embedding in normal conditions
Sealing ring is kept it turned in the opening of sealing ring, and failure is melted under station blackout operating mode, obtains sealing ring
To be closed in the presence of tightening ring, so as to effectively prevent flowing of the reactor coolant along pump shaft.
One kind as nuclear reactor coolant pump passive parking seal assembly of the present invention is improved, outside the sealing ring
An annular groove is offered on perisporium, tightening ring is housed in the annular groove of sealing ring and opposing seal ring positions.
One kind as nuclear reactor coolant pump passive parking seal assembly of the present invention is improved, and is opened on the sealing ring
If open amount be 1~3, the both ends of each opening are all engaged with each other by the connected structure with certain length.
One kind as nuclear reactor coolant pump passive parking seal assembly of the present invention is improved, and the sealing ring is opened
The connected structure of breach is formed when mouth is opens, fusible support block is arranged in the breach formed during sealing ring unlatching, it is ensured that
Sealing ring is in opening in nominal situation.
One kind as nuclear reactor coolant pump passive parking seal assembly of the present invention is improved, the fusible support block
It is fixed on tightening ring, it is protruded from tightening ring and inserted in the opening of sealing ring, it is ensured that sealing ring is in nominal situation
Opening.
One kind as nuclear reactor coolant pump passive parking seal assembly of the present invention is improved, and the sealing ring is in court
Offer multiple grooves on to the end face of cooling agent inflow direction, each groove radially extending and penetrate sealing along sealing ring
Ring so that reactor coolant can reach at the outer rim of sealing ring along groove at any time.
One kind as nuclear reactor coolant pump passive parking seal assembly of the present invention is improved, and the sealing ring is outside
Perisporium molds a compression inclined-plane with the end face intersection towards cooling agent inflow direction.
One kind as nuclear reactor coolant pump passive parking seal assembly of the present invention is improved, and the tightening ring is note
Recall alloy hoop, its diameter reduces with the rise of temperature.
One kind as nuclear reactor coolant pump passive parking seal assembly of the present invention is improved, and the tightening ring is just
Under normal operating mode, the enclasping force of very little is not produced or only produced；Under station blackout operating mode, larger enclasping force will be produced and driven
Sealing ring holds pump shaft tightly.
One kind as nuclear reactor coolant pump passive parking seal assembly of the present invention is improved, and the tightening ring is card
Spring, it has always after installing tightens up tendency.
One kind as nuclear reactor coolant pump passive parking seal assembly of the present invention is improved, the material of the sealing ring
Matter is PEEK, and it is resistant to 300 degrees Celsius of high temperature.
One kind as nuclear reactor coolant pump passive parking seal assembly of the present invention is improved, the material of the sealing ring
Matter is the PEEK containing glass fibre or the PEEK containing carbon fiber, and it is resistant to 300 degrees Celsius of high temperature.
One kind as nuclear reactor coolant pump passive parking seal assembly of the present invention is improved, and the sealing ring is by gold
Category is made.
In order to realize foregoing invention purpose, present invention also offers another nuclear reactor coolant pump passive parking is close
Sealing assembly, it includes sealing ring, tightening ring and fusible support block；The sealing ring and tightening ring are the opening of adjustable internal diameter
Ring, under nominal situation, sealing ring keeps gap with opening around nuclear reactor coolant pump pump shaft and with pump shaft, makes reaction
Reactor coolant can flow freely between sealing ring and pump shaft；Tightening ring is enclosed on the periphery wall of sealing ring, and it is in Quan Chang
Enclasping force enough bigly can be applied to sealing ring by powering off under operating mode, drive sealing ring to close and hold pump shaft tightly；Fusible support block
In normal conditions in the opening of tightening ring, tightening ring is maintained to the opening state that can not apply enclasping force to sealing ring
State, but under station blackout operating mode, fusible support block will melt and fail, and tightening ring is closed and is applied to sealing ring and hold tightly
Power, sealing ring close and effectively prevent flowing of the reactor coolant along pump shaft.
A kind of as another nuclear reactor coolant pump passive parking seal assembly of the present invention improves, the sealing
An annular groove is offered on the periphery wall of ring, tightening ring is housed in the annular groove of sealing ring and opposing seal ring is determined
Position.
A kind of as another nuclear reactor coolant pump passive parking seal assembly of the present invention improves, the sealing
The opening of ring and tightening ring is offset one from another, and fusible support block is housed in the annular groove of sealing ring together with tightening ring.
A kind of as another nuclear reactor coolant pump passive parking seal assembly of the present invention improves, the sealing
Ring offers multiple grooves, the radially extending and passing through along sealing ring of each groove on the end face towards cooling agent inflow direction
Logical sealing ring so that reactor coolant can reach at the outer rim of sealing ring along groove at any time；Sealing ring is in periphery wall and court
A compression inclined-plane is molded to the end face intersection of cooling agent inflow direction.
A kind of as another nuclear reactor coolant pump passive parking seal assembly of the present invention improves, described to tighten up
Ring is the memorial alloy ring that diameter reduces with the rise of temperature, or has the jump ring for tightening up tendency always.
In order to realize foregoing invention purpose, present invention also offers a kind of nuclear reactor coolant pump, and it is included from up to
Under the motor, static pressure gland seal assembly and the hydraulic part that set gradually, an and pump shaft for running through whole main pump center；It is described
Static pressure gland seal assembly includes the multiple seal assemblies being successively set between main pump hydraulic part and motor, these seal assemblies
It is arranged at the circumference of pump shaft；It is characterized in that：At least one in the multiple seal assembly is provided with above-mentioned between pump shaft
Passive parking seal assembly described in any one, so as to real by passive parking seal assembly under station blackout operating mode
The now sealing of the seal assembly and pump shaft.
One kind as nuclear reactor coolant pump of the present invention is improved, near hydraulic part in the static pressure gland seal assembly
A seal assembly be the first seal assembly, nuclear reactor coolant pump passive parking seal assembly is arranged on static pressure axle envelope
On first seal assembly of component.
One kind as nuclear reactor coolant pump of the present invention is improved, the nuclear reactor coolant pump static pressure gland seal assembly
The first seal assembly include rotating ring, stationary ring, sealing insert and sealing insertion support member, nuclear reactor coolant pump is passive
Stop seal component is arranged in the accepting groove that sealing insert inwall is opened up, or inserts support member inwall installed in sealing
In the accepting groove opened up.
One kind as nuclear reactor coolant pump of the present invention is improved, and the static pressure gland seal assembly uses three-level axle envelope, is wrapped
Include the first seal assembly being successively set between hydraulic part and motor, the second seal assembly and the 3rd seal assembly；Its
In, the first seal assembly is the sealing of balanced type Hydrostatic die mould controllable leak, and the second seal assembly is that pressure balance type end side is close
Envelope, the 3rd seal assembly is weir formula double seals.
Compared with prior art, nuclear reactor coolant pump passive parking seal assembly of the present invention only has three elements,
It can not only be when meeting station blackout operating mode under conditions of independent of emergent axle envelope injected system axle envelope integrality will
Ask, and with the advantages of simple in construction, sealing is firm.
Brief description of the drawings
With reference to the accompanying drawings and detailed description, to nuclear reactor coolant pump of the present invention, passive parking sealing group
Part and its advantageous effects are described in detail.
Fig. 1 is a kind of structural representation of existing nuclear reactor coolant pump.
Fig. 2 is the sectional view of the static pressure gland seal assembly in main pump shown in Fig. 1.
Fig. 3 is the sectional view of the first seal assembly in main pump shown in Fig. 1.
Fig. 4 is the structural representation of existing passive parking Sealing Technology.
Fig. 5 is that nuclear reactor coolant pump passive parking seal assembly of the present invention is close in nuclear reactor coolant pump first
Schematic view of the mounting position on sealing assembly.
Fig. 6 is the decomposition texture schematic diagram of nuclear reactor coolant pump passive parking seal assembly of the present invention.
Fig. 7 is the enlarged drawing of part A in Fig. 6.
Fig. 8 is the combining structure schematic diagram of nuclear reactor coolant pump passive parking seal assembly of the present invention.
Fig. 9 be nominal situation under nuclear reactor coolant pump passive parking seal assembly of the present invention use state and its
Neighbouring coolant flow to schematic diagram.
Figure 10 is the use shape of nuclear reactor coolant pump passive parking seal assembly of the present invention under station blackout operating mode
State and its neighbouring coolant flow to schematic diagram.
Embodiment
In order that the purpose of the present invention, technical scheme and its advantageous effects become apparent from, below in conjunction with accompanying drawing and tool
Body embodiment, the present invention will be described in further detail.It should be appreciated that the specific embodiment party described in this specification
Formula is not intended to limit the present invention just for the sake of explaining the present invention.
Nuclear reactor coolant pump of the present invention includes motor, static pressure gland seal assembly and the waterpower set gradually from top to bottom
Part, and a pump shaft for running through whole main pump center；Reactor coolant is pumped by an impeller mounted in pump shaft lower end,
It is sucked by pump case bottom and flows upwardly through impeller, is then taken over and discharged by the one outlet of stator and pump case side.
Static pressure gland seal assembly uses three-level axle envelope, including first be successively set between main pump hydraulic part and motor
Seal assembly, the second seal assembly and the 3rd seal assembly；Three seal assemblies be arranged on the circumference of pump shaft and along pump shaft axial direction
It is arranged in order, capsul is additionally provided with outside the first seal assembly and the second seal assembly.Wherein, the first seal assembly is balanced type
Hydrostatic die mould controllable leak seals, and the second seal assembly is pressure-balancing type end face seal, and the 3rd seal assembly is that weir formula is double
End face seal.
First seal assembly includes the rotating ring, stationary ring, sealing being successively set between hydraulic part and the second seal assembly
Insert and sealing insertion support member；Gap between pump shaft be present in the inwall of sealing insert and sealing insertion support member；
The outer wall of sealing insertion support member is close to capsul and sealed with capsul.Rotating ring is fixed on pump shaft and turned with pump shaft
Dynamic, stationary ring is not rotated but can slightly moved up and down along pump shaft axial direction or incline direction, to keep appropriate gap with rotating ring.Just
Under normal operating condition, stationary ring is kept minimum gap to form liquid film, made by hydrostatic equilibrium between control rotating ring, stationary ring
Rotating ring, two end faces of stationary ring are not directly contacted with the relative slip in one layer of thin water film both sides, operating, so as to control the first sealing
The leakage rate and wear extent of component.Be furnished with O-ring and auxiliary element between stationary ring and adjacent structural member, with higher-pressure region and
The auxiliary seal of a slip is formed between low-pressure area.In order to ensure the safety of reactor core under station blackout operating mode, this
Invention is provided with a passive parking seal assembly also between the first seal assembly and pump shaft.
Referring to Fig. 5, nuclear reactor coolant pump passive parking seal assembly 30 of the present invention is cold installed in nuclear reactor
But in the accepting groove that the sealing inwall of insert 154 of the first seal assembly of agent pump 15 is opened up, its in normal conditions with pump shaft
Gap between 18 be present, reactor coolant is flowed freely along pump shaft 18, but pump will be close under station blackout operating mode
Axle 18 and realize the circumferential seal between the first seal assembly 15 and pump shaft 18.
Fig. 6 to Fig. 9 is referred to, nuclear reactor coolant pump passive parking seal assembly 30 of the present invention includes sealing ring
40th, the fusible support block 50 on sealing ring 40 and the tightening ring 60 being looped around on the periphery wall of sealing ring 40.
Sealing ring 40 is the split ring of adjustable internal diameter, and the both ends for opening up opening 42 thereon are to be fitted together to each other and with one
The connected structure of measured length, preferably connected structure：When the both ends of opening 42 are fully engaged, sealing ring 40 be in closure state and
A unnotched close ring is rendered as, now its internal diameter is adapted with the diameter of corresponding position pump shaft 18；When opening 42
When two end portions engage, sealing ring 40 is in opening and is rendered as an annulus with breach 420, and internal diameter now relatively closes
It is bigger during conjunction state.An annular groove 44 for being used to house tightening ring 60 is offered on the periphery wall of sealing ring 40.Sealing ring
40 mold a compression inclined-plane 46 (as shown in Figure 9) in periphery wall and the end face intersection towards cooling agent inflow direction, and
Multiple grooves 48 are uniformly offered on the end face towards cooling agent inflow direction, groove 48 radially extends simultaneously along sealing ring 40
Penetrate sealing ring 40.The material of sealing ring 40 is that (PEEK is polyetheretherketone abbreviation to PEEK, and Chinese is
Polyether-ether-ketone) or PEEK containing glass fibre or carbon fiber, therefore 300 degrees Celsius of high temperature can be resistant to.
The shape of fusible support block 50 is adapted with the lower shape for forming breach 420 of the opening of sealing ring 40, and its is embedding
Conjunction makes sealing ring 402 not close in breach 420.The material of fusible support block 50 make its can at a set temperature, through setting
Melted after fixing time, therefore will be melted and lose to sealing ring 40 by high temperature fluid in setting time under station blackout operating mode
Opening 42 support.
Tightening ring 60 is housed in the annular groove 44 of sealing ring 40, and it is made up of memory alloy material, and diameter is with temperature
Rise and reduce：In normal conditions, tightening ring 60 does not produce or only produced the enclasping force of very little, the diameter under this state with
The diameter of annular groove 44 of the sealing ring 40 strutted by fusible support block 50 is adapted；Under station blackout operating mode, tightening ring 60
Larger enclasping force will be produced because temperature raises, therefore the sealing ring 40 for losing the fusible support of support block 50 can be driven to hold tightly
Pump shaft 18, effectively circumferential seal is formed between pump shaft 18 and sealing ring 40.
Referring to Fig. 9, in normal conditions, nuclear reactor coolant pump passive parking seal assembly 30 of the present invention it is close
Seal ring 40 is in opening under the support of fusible support block 50, gap 32 is kept between sealing ring 40 and pump shaft 18 so that cold
But agent leakage can flow freely along direction shown in arrow between sealing insert 154 and pump shaft 18, and it is close to enter first
Seal in leakage line.
Referring to Fig. 10, under station blackout operating mode, main pump axle envelope injection water and cooling water are lost simultaneously when, HTHP
Reactor coolant flows up along pump shaft 18, and tightening ring 60 produces larger holding due to the memory characteristic of its alloy material
Power, have the tendency of to drive sealing ring 40 to hold pump shaft 18 tightly, but due to the prevention of fusible support block 50, sealing ring 40 still maintains to open
Open state.Temperature at fusible support block 50 reach its fusion temperature and by the regular hour (time is preset time, one
As for rather to ten rather) after, fusible support block 50 will because produce phase transformation volatilization lose supporting role, sealing ring 40 is just being received
Close to contract under the tightening force effect of tight ring 60 and hold pump shaft 18 tightly, realize sealing function；Now, HTHP cools down
Agent by groove 48 enter passive parking seal exterior lateral area, and to sealing ring 40 apply pressure, due to sealing ring 40 with
Gap very little at sealing insertion support member 156, the pressure of HTHP cooling agent will make sealing ring 40 to sealing insertion support
Part 156 and the both direction of pump shaft 18 compress and further reach self sealss；Simultaneously as the material of sealing ring 40 omits at high temperature
Micro- softening, there is micro extrusion in the gap between pump shaft 18 and sealing insertion support member 156, therefore enables to sealing effectiveness to reach
To optimal.
In various embodiments, nuclear reactor coolant pump passive parking seal assembly 30 of the present invention can not also
On the sealing insert 154 of the first seal assembly 15, and it is changed to the sealing insertion branch installed in the first seal assembly 15
In support member 156, as long as the purpose that limited reactions reactor coolant leaks to environment can be reached；Wherein, opening on sealing ring 40
Mouth can be set to one to three as needed；Fusible support block 50 can be directly embedded into breach 420 as shown in Figure 8,
It can be fixed in tightening ring 60 and insert in the opening 42 of sealing ring 40, can not also be in embedding sealing ring 40, but be changed to
Tightening ring 60 can not be applied enclasping force to sealing ring 40 in the breach that embedded tightening ring 60 is opened up, as long as in a word can be just
Prevent sealing ring 40 from closing under normal operating mode；Sealing ring 40 can also be made of metal；Tightening ring 60 can also be jump ring, and
Sealing ring 40 is applied always after mounting and is enough to make it hold the pretightning force of pump shaft 18 tightly.
By above description, nuclear reactor coolant pump passive parking seal assembly of the present invention passes through tightening ring 60
Drive sealing ring 40 to ensure functional completeness of the main pump static pressure axle envelope under station blackout operating mode, therefore relieve to axle envelope of meeting an urgent need
The dependence of injected system and active drive device, and effectively reduce the reactor core probability of damage of nuclear power plant；Further, since this hair
The inwall that support member 156 is inserted in the bright simply sealing insert 154 to the first seal assembly 15 or sealing is slotted, therefore right
The other structures of main pump do not have any influence, do not interfere with performance when main pump is run in normal conditions yet.
The announcement and teaching of book according to the above description, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula carries out appropriate change and modification.Therefore, the invention is not limited in embodiment disclosed and described above, to this
Some modifications and changes of invention should also be as falling into the scope of the claims of the present invention.In addition, although this specification
In used some specific terms, but these terms are merely for convenience of description, do not form any restrictions to the present invention.
Claims (19)
- A kind of 1. nuclear reactor coolant pump passive parking seal assembly, it is characterised in that：Including sealing ring, tightening ring and can Molten support block；The sealing ring is the split ring of adjustable internal diameter, and under nominal situation, sealing ring is with opening around nuclear reaction Reactor coolant pump pump shaft simultaneously keeps gap with pump shaft, reactor coolant is flowed freely between sealing ring and pump shaft； Tightening ring is enclosed on the periphery wall of sealing ring, and it can apply under station blackout operating mode to sealing ring holds tightly greatly enough Power, sealing ring is driven to close and hold pump shaft tightly；Fusible support block makes sealing in the opening of sealing ring in normal conditions Ring is kept it turned on, and failure is melted under station blackout operating mode, sealing ring is closed in the presence of tightening ring, from And effectively prevent flowing of the reactor coolant along pump shaft；The sealing ring offers multiple grooves on the end face towards cooling agent inflow direction, and each groove is along sealing ring Radially extend and penetrate sealing ring so that reactor coolant can reach at the outer rim of sealing ring along groove at any time；The sealing ring molds a compression inclined-plane in periphery wall and the end face intersection towards cooling agent inflow direction.
- 2. nuclear reactor coolant pump passive parking seal assembly according to claim 1, it is characterised in that：It is described close An annular groove is offered on the periphery wall of seal ring, tightening ring is housed in the annular groove of sealing ring and opposing seal ring is determined Position.
- 3. nuclear reactor coolant pump passive parking seal assembly according to claim 1, it is characterised in that：It is described close The open amount opened up in seal ring is 1~3, and the both ends of each opening are all connect each other by the connected structure with certain length Close.
- 4. nuclear reactor coolant pump passive parking seal assembly according to claim 1, it is characterised in that：It is described close The connected structure of breach is formed when the opening of seal ring is opens, fusible support block is arranged on the breach formed when sealing ring is opened In, it is ensured that sealing ring is in opening in nominal situation.
- 5. nuclear reactor coolant pump passive parking seal assembly according to claim 1, it is characterised in that：It is described can Molten support block is fixed on tightening ring, and it protrudes from tightening ring and inserted in the opening of sealing ring, it is ensured that sealing ring is in normal work Opening is in during condition.
- 6. nuclear reactor coolant pump passive parking seal assembly according to claim 1, it is characterised in that：The receipts Tight ring is memorial alloy ring, and its diameter reduces with the rise of temperature.
- 7. nuclear reactor coolant pump passive parking seal assembly according to claim 1, it is characterised in that：The receipts Tight ring in normal conditions, does not produce or only produced the enclasping force of very little；Under station blackout operating mode, larger holding will be produced Power and drive sealing ring hold tightly pump shaft.
- 8. nuclear reactor coolant pump passive parking seal assembly according to claim 1, it is characterised in that：The receipts Tight ring is jump ring, and it has always after installing tightens up tendency.
- 9. nuclear reactor coolant pump passive parking seal assembly according to claim 1, it is characterised in that：It is described close The material of seal ring is PEEK, and it is resistant to 300 degrees Celsius of high temperature.
- 10. nuclear reactor coolant pump passive parking seal assembly according to claim 1, it is characterised in that：It is described The material of sealing ring is the PEEK containing glass fibre or the PEEK containing carbon fiber, and it is resistant to 300 degrees Celsius of height Temperature.
- 11. nuclear reactor coolant pump passive parking seal assembly according to claim 1, it is characterised in that：It is described Sealing ring is made of metal.
- A kind of 12. nuclear reactor coolant pump passive parking seal assembly, it is characterised in that：Including sealing ring, tightening ring and Fusible support block；The sealing ring and tightening ring are the split ring of adjustable internal diameter, and under nominal situation, sealing ring is with opening state State simultaneously keeps gap around nuclear reactor coolant pump pump shaft with pump shaft, allow reactor coolant sealing ring and pump shaft it Between flow freely；Tightening ring is enclosed on the periphery wall of sealing ring, and it can apply foot under station blackout operating mode to sealing ring Enough big ground enclasping forces, drive sealing ring to close and hold pump shaft tightly；Fusible support block is embedded in the opening of tightening ring in normal conditions In, tightening ring is maintained to the opening that can not apply enclasping force to sealing ring, but under station blackout operating mode, fusible support Block will melt and fail, and tightening ring is closed and applies enclasping force to sealing ring, sealing ring closes and effectively prevents reactor Flowing of the cooling agent along pump shaft；The sealing ring offers multiple grooves on the end face towards cooling agent inflow direction, and each groove is along sealing ring Radially extend and penetrate sealing ring so that reactor coolant can reach at the outer rim of sealing ring along groove at any time；Sealing ring A compression inclined-plane is molded in periphery wall and the end face intersection towards cooling agent inflow direction.
- 13. nuclear reactor coolant pump passive parking seal assembly according to claim 12, it is characterised in that：It is described An annular groove is offered on the periphery wall of sealing ring, tightening ring is housed in the annular groove of sealing ring and opposing seal ring Positioning.
- 14. nuclear reactor coolant pump passive parking seal assembly according to claim 13, it is characterised in that：It is described The opening of sealing ring and tightening ring is offset one from another, and fusible support block is housed in the annular groove of sealing ring together with tightening ring.
- 15. nuclear reactor coolant pump passive parking seal assembly according to claim 12, it is characterised in that：It is described Tightening ring is the memorial alloy ring that diameter reduces with the rise of temperature, or has the jump ring for tightening up tendency always.
- 16. a kind of nuclear reactor coolant pump, it includes the motor, static pressure gland seal assembly and waterpower set gradually from top to bottom Part, and a pump shaft for running through whole main pump center；The static pressure gland seal assembly includes being successively set on main pump hydraulic portion Multiple seal assemblies between part and motor, these seal assemblies are arranged at the circumference of pump shaft；It is characterized in that：It is described more At least one passive parking sealing being provided between pump shaft any one of claim 1 to 15 in individual seal assembly Component, so as to realize the sealing of the seal assembly and pump shaft by passive parking seal assembly under station blackout operating mode.
- 17. nuclear reactor coolant pump according to claim 16, it is characterised in that：Most leaned in the static pressure gland seal assembly One seal assembly of nearly hydraulic part is the first seal assembly, and nuclear reactor coolant pump passive parking seal assembly is installed On the first seal assembly of static pressure gland seal assembly.
- 18. nuclear reactor coolant pump according to claim 17, it is characterised in that：The nuclear reactor coolant pump is quiet First seal assembly of last item sealing assembly includes rotating ring, stationary ring, sealing insert and sealing insertion support member, nuclear reactor cooling Agent pump passive parking seal assembly is arranged in the accepting groove that sealing insert inwall is opened up, or inserted installed in sealing In the accepting groove that support member inwall is opened up.
- 19. nuclear reactor coolant pump according to claim 16, it is characterised in that：The static pressure gland seal assembly uses three Level axle envelope, including the first seal assembly, the second seal assembly and the 3rd close being successively set between hydraulic part and motor Sealing assembly；Wherein, the first seal assembly is the sealing of balanced type Hydrostatic die mould controllable leak, and the second seal assembly is pressure balance Type end side seals, and the 3rd seal assembly is weir formula double seals.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410664722.7A CN105240309B (en) | 2014-11-19 | 2014-11-19 | Nuclear reactor coolant pump and its passive parking seal assembly |
| PCT/CN2015/094925 WO2016078588A1 (en) | 2014-11-19 | 2015-11-18 | Nuclear reactor coolant pump and passive stopping seal assembly thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410664722.7A CN105240309B (en) | 2014-11-19 | 2014-11-19 | Nuclear reactor coolant pump and its passive parking seal assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105240309A CN105240309A (en) | 2016-01-13 |
| CN105240309B true CN105240309B (en) | 2017-11-17 |
Family
ID=55038086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410664722.7A Active CN105240309B (en) | 2014-11-19 | 2014-11-19 | Nuclear reactor coolant pump and its passive parking seal assembly |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN105240309B (en) |
| WO (1) | WO2016078588A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018209545A1 (en) * | 2017-05-16 | 2018-11-22 | 中广核工程有限公司 | Nuclear reactor coolant pump and passive parking sealing device thereof |
| CN107100882B (en) * | 2017-05-16 | 2019-04-16 | 中广核工程有限公司 | Nuclear reactor coolant pump and its passive parking sealing device |
| CN110886720A (en) * | 2018-09-10 | 2020-03-17 | 威乐(中国)水泵系统有限公司 | Quick detachable choma |
| CN112096873A (en) * | 2020-07-31 | 2020-12-18 | 中核核电运行管理有限公司 | Floating sealing device for mechanical seal of hydrodynamic main pump of nuclear power station |
| CN112648193A (en) * | 2020-12-16 | 2021-04-13 | 江苏飞跃机泵集团有限公司 | Forced circulation lead-bismuth pump |
| CN113958535B (en) * | 2021-09-02 | 2023-06-27 | 西安航天动力研究所 | Impeller pressure drop type disengaging sealing device for liquid rocket engine |
| CN114215919B (en) * | 2021-12-17 | 2022-12-13 | 中密控股股份有限公司 | Can show novel nuclear main pump static pressure bearing seal structure that improves stability |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4105040A (en) * | 1977-06-27 | 1978-08-08 | Chester Arnold M | Temperature responsive valve seal |
| FR2986300B1 (en) * | 2012-02-01 | 2014-03-07 | Jeumont Systemes De Pompes Et De Mecanismes | PASSIVE STOP SEALING DEVICE FOR SHAFT JOINT SYSTEM OF PRIMARY MOTOR PUMP GROUP |
| CN203214294U (en) * | 2012-04-18 | 2013-09-25 | 孟想 | Passive stop sealing device in pump |
| FR2992392B1 (en) * | 2012-06-25 | 2014-07-11 | Jspm | PASSIVE STOP SEALING DEVICE FOR SHAFT JOINT SYSTEM OF PRIMARY MOTOR PUMP GROUP |
| CN202851941U (en) * | 2012-11-15 | 2013-04-03 | 中国核动力研究设计院 | Large-diameter alloy O-shaped seal ring |
| JP6021702B2 (en) * | 2013-03-19 | 2016-11-09 | 三菱重工業株式会社 | Leak prevention seal, reactor coolant pump |
| CN103267030B (en) * | 2013-05-22 | 2016-03-23 | 哈尔滨电气动力装备有限公司 | Reactor coolant pump parking sealing arrangement |
| CN103711910B (en) * | 2013-12-10 | 2015-11-25 | 合肥通用机械研究院 | Self-compensating emergency combined seal for nuclear reactor main circulating pump sealing device |
| CN103671228A (en) * | 2013-12-10 | 2014-03-26 | 中广核工程有限公司 | Method for carrying out emergent shaft sealing on reactor coolant pump and shaft sealing assembly |
| CN103790855A (en) * | 2014-02-21 | 2014-05-14 | 清华大学 | Nuclear main pump mechanical seal system with active and passive shutdown sealing |
-
2014
- 2014-11-19 CN CN201410664722.7A patent/CN105240309B/en active Active
-
2015
- 2015-11-18 WO PCT/CN2015/094925 patent/WO2016078588A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2016078588A1 (en) | 2016-05-26 |
| CN105240309A (en) | 2016-01-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105240309B (en) | Nuclear reactor coolant pump and its passive parking seal assembly | |
| CN106795967B (en) | The method and gland seal assembly of emergency axle envelope are carried out to reactor coolant pump | |
| CN105531484B (en) | The pump seal of formula actuator is returned with pyrocondensation | |
| CN104976150B (en) | Nuclear reactor coolant pump and its passive parking sealing device | |
| CN102195387A (en) | Sealing structure of submersible pump | |
| CN105889144A (en) | Ocean thermal energy power generating device | |
| CN207039328U (en) | Rotor liquid cooling structure | |
| CN107100882B (en) | Nuclear reactor coolant pump and its passive parking sealing device | |
| CN107061307A (en) | Utilize the submersible pump structure of air jacking principle waterproof sealing | |
| CN105673551B (en) | Nuclear power plant's nuclear reactor coolant pump and its static pressure gland seal assembly | |
| KR20140021121A (en) | The reactor coolant pump of an integral reactor using an external circulation loop | |
| CN204629083U (en) | The online drawing out type immersed pump system of a kind of cryogenic storage tank | |
| CN101710760B (en) | Sealing structure of hydrogen cooler of generator | |
| CN210368872U (en) | Novel hydropower station gate water filling valve | |
| CN207111938U (en) | A kind of sealing device of slurry rapid steamer | |
| CN206386281U (en) | High-temperature pump is with horizontal flameproof motor pressure regulating device | |
| WO2018209545A1 (en) | Nuclear reactor coolant pump and passive parking sealing device thereof | |
| CN108539902B (en) | Motor sealing device of electric automobile | |
| CN216242954U (en) | Lining pipeline for repairing pipeline | |
| CN206035886U (en) | A device that is used for support of centrifugal pump filler to wash | |
| CN218761582U (en) | Novel valve capable of changing flow direction | |
| CN214365986U (en) | Novel ram blowout preventer | |
| CN212804228U (en) | Double-seal ring waterproof sealing structure | |
| CN209704928U (en) | A kind of cooling component and centrifugal pump of transmission shaft | |
| CN207638307U (en) | Cable duct bank sealing blocking device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| DD01 | Delivery of document by public notice |
Addressee: CHINA NUCLEAR POWER ENGINEERING Co.,Ltd. Document name: Notification of Passing Examination on Formalities |
|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20160113 Assignee: SHANDONG HAORAN SPECIAL PLASTIC CO.,LTD. Assignor: CHINA NUCLEAR POWER ENGINEERING Co.,Ltd. Contract record no.: X2024980000662 Denomination of invention: Nuclear reactor coolant pump and its passive shutdown sealing components Granted publication date: 20171117 License type: Common License Record date: 20240115 |