CN105673551B - Nuclear power plant's nuclear reactor coolant pump and its static pressure gland seal assembly - Google Patents

Nuclear power plant's nuclear reactor coolant pump and its static pressure gland seal assembly Download PDF

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Publication number
CN105673551B
CN105673551B CN201410665419.9A CN201410665419A CN105673551B CN 105673551 B CN105673551 B CN 105673551B CN 201410665419 A CN201410665419 A CN 201410665419A CN 105673551 B CN105673551 B CN 105673551B
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China
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seal assembly
ring
storage tank
power plant
reactor coolant
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CN105673551A (en
Inventor
罗志远
丛国辉
雍兴平
张翊勋
王学灵
陈兴江
唐堃
马玉杰
叶泉流
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SHENYANG BLOWER WORKS GROUP NUCLEAR POWER PUMP CO Ltd
China Nuclear Power Engineering Co Ltd
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SHENYANG BLOWER WORKS GROUP NUCLEAR POWER PUMP CO Ltd
China Nuclear Power Engineering Co Ltd
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Abstract

The invention discloses a kind of nuclear power plant's nuclear reactor coolant pump and its static pressure gland seal assembly, the first seal assembly of the static pressure gland seal assembly is realized and is located at the circumferential seal between its outside capsul by sealing ring and high molecular polymer ring;First seal assembly with capsul contact position at outer wall on offer annular storage tank, the both ends of annular storage tank cross section have different width, wherein the smaller pressed end in larger accommodating end is closer to cooling medium pump hydraulic part;High molecular polymer ring is housed in nominal situation in the accommodating end of annular storage tank, it will soften under station blackout operating mode and be squeezed into by high-temperature, high pressure fluid the pressed end of annular storage tank, so as to be brought into close contact with capsul and the first seal assembly, ensure lasting seals therebetween.Compared with prior art, the present invention relieves the dependence to high-temperature resistant rubber O-ring, and effectively reduces the reactor core probability of damage of nuclear power plant.

Description

Nuclear power plant's nuclear reactor coolant pump and its static pressure gland seal assembly
Technical field
The invention belongs to nuclear power field, it is more particularly related to a kind of nuclear power plant's nuclear reactor coolant pump and Its static pressure gland seal assembly.
Background technology
In PWR nuclear power plant, hydrostatic pressure axle envelope type cooling medium pump is the list driven by triphase induction type motor Level, single suction, vertical mixed flow pump.Fig. 1 is a kind of structural representation of existing nuclear reactor coolant pump, its from top to bottom successively by Motor 10, static pressure gland seal assembly 12 and hydraulic part 14 form, and pump shaft runs through the center of whole cooling medium pump;Reactor cools down Agent is pumped by an impeller mounted in pump shaft lower end, and it is sucked by pump case bottom and flows upwardly through impeller, then passes through stator Discharge is taken over the one outlet of pump case side.
Referring to Fig. 2, the static pressure gland seal assembly 12 in cooling medium pump uses three-level axle envelope, including it is successively set on waterpower portion The first seal assembly 15, the second seal assembly 16 and the 3rd seal assembly 17 between part 14 and motor 10;Three sealing groups Part 15,16,17 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 sealing group Capsul 19 is additionally provided with outside part 16.Wherein, the first seal assembly 15 is that balanced type Hydrostatic die mould controllable leak seals, second Seal assembly 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;The outer wall of sealing insertion support member 156 is close to capsul 19, And realized and sealed with capsul 19 using high-temperature resistant rubber O circles;Rotating ring 150 is fixed on pump shaft 18 and rotated with pump shaft 18, quiet Ring 152 is not rotated but can slightly moved up and down along the axial direction of pump shaft 18 or incline direction, between keeping appropriate with rotating ring 150 Gap.Under accidental conditions, stationary ring 152 keeps minimum by hydrostatic equilibrium between control rotating ring 150, stationary ring 152 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 cooling medium 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 cooling agent The first seal assembly 15 in pump provides standby cooling.Now, the high temperature of primary Ioops (referring to reactor coolant loop major loop) Fluid will threaten the first seal assembly 15 quickly, and its thermal stress may lose cooling medium pump axle envelope function, so as to destroy one Circuit 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 is close to the emergent water filling of cooling medium pump axle envelope, maintenance first Cooling and lubrication at sealing assembly 15, while high-temperature high-voltage reaction reactor coolant is limited in the lower section of the first seal assembly 15, protect The temperature at the first seal assembly 15 is demonstrate,proved in the range of its service requirement, prevents cooling medium pump axle envelope cut accident (Seal LOCA) occur, ensure the integrality of primary Ioops pressure boundary.But because existing nuclear power plant is mostly that double heaps are arranged, two units A hydraulic testpump is shared, also only considers that the loss of power accident, therefore the name of hydraulic testpump occur for single unit in design Flow is 6m3/ h, it is only capable of the axle envelope water injection rate demand for meeting 3 cooling medium pumps of a unit;This causes in station blackout work During condition, the emergent axle envelope injection of the cooling medium pump of a unit in addition can not ensure and axle envelope cut accident occurs;Losing After some moisturizing means, the leakage of primary Ioops can not be supplemented, and water loading amount cannot be guaranteed, will cause reactor core gradually it is exposed simultaneously Final fusing.
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 cooling medium pump under station blackout operating mode.Under station blackout operating mode, High-temperature, high pressure fluid flow direction at the first seal assembly of cooling medium pump 15 as shown in Fig. 4 arrow, it can be seen that The key that limited reactions reactor coolant leaks to environment is to seal two important sealing stations 20,22.Existing portion Pyrene power plant has started to ensure using passive parking Sealing Technology the integrality of cooling medium pump axle envelope, its concrete operations mode It is:1) the increase passive parking seal assembly 24 directly in the sealing insert 154 of the first seal assembly of cooling medium pump 15, comes Realize the sealing at the first sealing station 20;2) using high-temperature resistant rubber O circles 26, realize and (sealed at the second sealing station 22 Insert between support member 156 and capsul 19) sealing.But because the cost of high-temperature resistant rubber O circles 26 is higher, Er Qieqi Under high temperature, high pressure and high radioactivity dosage level, the sealing property that can be kept is limited, therefore can not still avoid axle completely Seal cut accident.
In view of this, it is necessory to provide a kind of core that can solve the problem that sealing problem between stationary parts under station blackout operating mode Power plant's nuclear reactor coolant pump and its static pressure gland seal assembly.
The content of the invention
It is an object of the invention to:A kind of core that can solve the problem that sealing problem between stationary parts under station blackout operating mode is provided Power plant's nuclear reactor coolant pump and its static pressure gland seal assembly, to improve the reliability of cooling medium pump axle envelope, prevent cooling medium pump The generation of axle envelope cut accident.
In order to realize foregoing invention purpose, the invention provides a kind of static pressure axle envelope of nuclear power plant's nuclear reactor coolant pump Component, it includes multiple seal assemblies for being arranged on pump shaft circumference;Wherein, the first seal assembly is realized with being located at by sealing ring Circumferential seal between its outside capsul;High molecular polymer is additionally provided between first seal assembly and capsul Ring;First seal assembly with capsul contact position at outer wall on offer annular storage tank, annular storage tank cross section Both ends there is different width, wherein the smaller pressed end in larger accommodating end is closer to cooling medium pump hydraulic part;It is high Molecularly Imprinted Polymer ring is housed in nominal situation in the accommodating end of annular storage tank, and will soften simultaneously quilt under station blackout operating mode High-temperature, high pressure fluid is squeezed into the pressed end of annular storage tank, so as to be brought into close contact with capsul and the first seal assembly, protects The lasting seals of card therebetween.
The a kind of of static pressure gland seal assembly as nuclear power plant's nuclear reactor coolant pump of the present invention improves, the polyphosphazene polymer The inwall of compound ring is inclined design, and when in annular storage tank, its inclined-plane is towards pump shaft and cooling medium pump hydraulic part Place direction.
The a kind of of static pressure gland seal assembly as nuclear power plant's nuclear reactor coolant pump of the present invention improves, the polyphosphazene polymer The truncation surface of compound ring is right-angled trapezium, and when in annular storage tank, the bottom of right-angled trapezium is towards pressed end, right angle waist Then it is bonded with capsul.
The a kind of of static pressure gland seal assembly as nuclear power plant's nuclear reactor coolant pump of the present invention improves, the polyphosphazene polymer The material of compound ring is PEEK, the PEEK containing glass fibre or the PEEK containing carbon fiber.
The a kind of of static pressure gland seal assembly as nuclear power plant's nuclear reactor coolant pump of the present invention improves, the sealing ring with High molecular polymer ring is housed in the accommodating end of annular storage tank together, and sealing ring is located remotely from the position of pressed end, high Molecularly Imprinted Polymer ring is located at close to the position of pressed end.
The a kind of of static pressure gland seal assembly as nuclear power plant's nuclear reactor coolant pump of the present invention improves, first sealing Support member is inserted in the sealing that component includes with capsul directly contacts, and annular storage tank is opened in sealing insertion support member and sealing On outer wall at shell contact position;An accepting groove for being used to house sealing ring is separately offered on sealing insertion support member, is housed Groove opens up position than annular storage tank closer to hydraulic part.
The a kind of of static pressure gland seal assembly as nuclear power plant's nuclear reactor coolant pump of the present invention improves, the polyphosphazene polymer One or two retractable otch is offered on compound ring, in order to peace of the high molecular polymer ring in annular storage tank Dress.
The a kind of of static pressure gland seal assembly as nuclear power plant's nuclear reactor coolant pump of the present invention improves, the polyphosphazene polymer The otch both ends of compound ring are connected structure.
The a kind of of static pressure gland seal assembly as nuclear power plant's nuclear reactor coolant pump of the present invention improves, and the sealing ring is Conventional O circles or high-temperature resistant rubber O circles.
The a kind of of static pressure gland seal assembly as nuclear power plant's nuclear reactor coolant pump of the present invention improves, first sealing Component is a seal assembly near hydraulic part, and it includes rotating ring, stationary ring, sealing insert and sealing insertion support Part;Annular storage tank is opened in sealing insertion support member and on the outer wall at capsul contact position, high molecular polymer ring exists Soften and after being squeezed into the pressed end of annular storage tank by high-temperature, high pressure fluid under station blackout operating mode, will be with capsul and close Envelope insertion support member is brought into close contact.
The a kind of of static pressure gland seal assembly as nuclear power plant's nuclear reactor coolant pump of the present invention improves, the static pressure axle envelope Component uses three-level axle envelope, including be successively set between hydraulic part and motor the first seal assembly, the second sealing group Part and the 3rd seal assembly;Wherein, the first seal assembly is that balanced type Hydrostatic die mould controllable leak seals, the second seal assembly It is pressure-balancing type end face seal, the 3rd seal assembly is weir formula double seals.
In order to realize foregoing invention purpose, present invention also offers a kind of nuclear power plant's nuclear reactor coolant pump, it includes Motor, static pressure gland seal assembly and the hydraulic part set gradually from top to bottom, and one run through whole cooling medium pump center Pump shaft;The static pressure gland seal assembly includes the multiple sealing groups being successively set between cooling medium pump hydraulic part and motor Part, these seal assemblies are arranged at the circumference of pump shaft, capsul are provided with outside the first seal assembly therein;First sealing group Part realizes the circumferential seal between capsul by sealing ring;High score is additionally provided between first seal assembly and capsul Sub- polymer ring;First seal assembly with capsul contact position at outer wall on offer annular storage tank, annular is accommodating The both ends of groove cross section have different width, wherein the smaller pressed end in larger accommodating end is closer to cooling medium pump waterpower Part;High molecular polymer ring is housed in nominal situation in the accommodating end of annular storage tank, will under station blackout operating mode Soften and the pressed end of annular storage tank is squeezed into by high-temperature, high pressure fluid, so as to close with capsul and the first seal assembly Fitting, ensures lasting seals therebetween.
One kind as nuclear power plant's nuclear reactor coolant pump of the present invention is improved, and first seal assembly includes and sealing The sealing insertion support member that shell directly contacts, annular storage tank are opened at sealing insertion support member and capsul contact position On outer wall, high molecular polymer ring softens under station blackout operating mode and is squeezed into annular storage tank by high-temperature, high pressure fluid After pressed end, it will be brought into close contact with capsul and sealing insertion support member.
One kind as nuclear power plant's nuclear reactor coolant pump of the present invention is improved, and the inwall of the high molecular polymer ring is Inclined design, when in annular storage tank, direction where its inclined-plane towards pump shaft and cooling medium pump hydraulic part.
One kind as nuclear power plant's nuclear reactor coolant pump of the present invention is improved, the truncation surface of the high molecular polymer ring For right-angled trapezium, when in annular storage tank, the bottom of right-angled trapezium is then pasted towards pressed end, right angle waist with capsul Close.
One kind as nuclear power plant's nuclear reactor coolant pump of the present invention is improved, and the material of the high molecular polymer ring is PEEK, the PEEK containing glass fibre or the PEEK containing carbon fiber.
One kind as nuclear power plant's nuclear reactor coolant pump of the present invention is improved, the sealing ring and high molecular polymer ring It is housed in together in the accommodating end of annular storage tank, and sealing ring is located remotely from the position of pressed end, high molecular polymer ring position In close to the position of pressed end.
One kind as nuclear power plant's nuclear reactor coolant pump of the present invention is improved, and is separately opened up on the sealing insertion support member There is one to be used to housing the accepting groove of sealing ring, accepting groove opens up position than annular storage tank closer to hydraulic part.
One kind as nuclear power plant's nuclear reactor coolant pump of the present invention is improved, and is offered on the high molecular polymer ring One or two retractable otch, in order to installation of the high molecular polymer ring in annular storage tank.
One kind as nuclear power plant's nuclear reactor coolant pump of the present invention is improved, the otch two of the high molecular polymer ring Hold as connected structure.
One kind as nuclear power plant's nuclear reactor coolant pump of the present invention is improved, and first seal assembly is near water One seal assembly of power part, it includes rotating ring, stationary ring, sealing insert and sealing insertion support member.
Compared with prior art, the static pressure gland seal assembly of nuclear power plant's nuclear reactor coolant pump of the present invention passes through polyphosphazene polymer Compound ring ensures sealing of the stationary parts of cooling medium pump static pressure axle envelope under station blackout operating mode, therefore relieves to resistance to height The dependence of warm rubber o-ring, and effectively reduce the reactor core probability of damage of nuclear power plant.
Brief description of the drawings
With reference to the accompanying drawings and detailed description, to nuclear power plant's nuclear reactor coolant pump of the present invention, static pressure axle envelope 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 cooling medium pump shown in Fig. 1.
Fig. 3 is the sectional view of the first seal assembly in cooling medium pump shown in Fig. 1.
Fig. 4 is the structural representation of existing passive parking Sealing Technology.
Fig. 5 be the static pressure gland seal assembly of nuclear power plant's nuclear reactor coolant pump of the present invention stationary parts between sealing structure the The schematic diagram of one embodiment.
Fig. 6 be the static pressure gland seal assembly of nuclear power plant's nuclear reactor coolant pump of the present invention stationary parts between sealing structure the The schematic diagram of two embodiments.
Fig. 7 is that the high molecular polymer ring of the static pressure gland seal assembly of nuclear power plant's nuclear reactor coolant pump of the present invention opens up one The structural representation of individual otch.
Fig. 8 is that the high molecular polymer ring of the static pressure gland seal assembly of nuclear power plant's nuclear reactor coolant pump of the present invention opens up two The structural representation of individual otch.
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 power plant's nuclear reactor coolant pump of the present invention includes motor, the static pressure gland seal assembly set gradually from top to bottom And hydraulic part, and a pump shaft for running through whole cooling medium pump center;Reactor coolant is mounted in pump shaft lower end by one Impeller pumping, it is sucked by pump case bottom and flows upwardly through impeller, then passes through stator and the one outlet of pump case side Adapter discharge.
Static pressure gland seal assembly uses three-level axle envelope, including is successively set between cooling medium pump hydraulic part and motor First seal assembly, the second seal assembly and the 3rd seal assembly;Three seal assemblies are arranged on the circumference of pump shaft and along pump shafts Axially 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 flat Weighing apparatus 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 weir Formula double seals.
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.
Fig. 5 and Fig. 6 are referred to, the first seal assembly of nuclear power plant's nuclear reactor coolant pump of the present invention passes through sealing ring 30 And high molecular polymer ring 40 seals the sealing inserted between support member 50/50a and capsul 60 to realize.
Sealing ring 30 is enclosed using conventional O, naturally it is also possible to using high temperature resistant, high pressure and the RUBBER O of irradiation circle.
The inwall of high molecular polymer ring 40 is inclined design, so that its truncation surface is right-angled trapezium.Polyphosphazene polymer Compound ring 40 is PEEK (PEEK is polyetheretherketone abbreviation, and Chinese is polyether-ether-ketone) or contains glass The PEEK of glass fiber or carbon fiber.Polyether-ether-ketone is the Linear aromatic macromolecular compound containing chain link in molecular backbone, is gathered The heat distortion temperature of ether ether ketone resin is 160 DEG C, fusing point reach 334 DEG C, glass transition temperature be 143 DEG C, therefore, can be with resistance to Positive 260 degree of high temperature, resistance to positive high temperature can at least reach 300 degree after modified, and have excellent mechanical performance, chemicals-resistant rotten Corrosion energy, fire resistance, anti-wear performance and radiation resistance.In other embodiments, high molecular polymer ring 40 blocks Face can also be the shape that other facilitate high-temperature, high pressure fluid compression high molecular polymer ring 40.
Support member 50/50a at the contact position of capsul 60 on the outer wall with offering annular storage tank for sealing insertion.Annular The cross section of storage tank is stepped ramp type, and pressed end 522/522a smaller its larger accommodating end 520/520a is closer to cooling The hydraulic part of agent pump.High molecular polymer ring 40 is housed in the accommodating end 520/520a of annular storage tank in nominal situation It is interior, direction where its inclined-plane 41 towards pump shaft and cooling medium pump hydraulic part, that is to say, that the bottom court of truncation surface right-angled trapezium To pressed end 522/522a, right angle waist is then bonded with capsul 60.
In the first embodiment shown in Fig. 5, sealing ring 30 is housed in annular appearance together with high molecular polymer ring 40 Put in the accommodating end 520 of groove, and sealing ring 30 is located remotely from the position of pressed end 522, high molecular polymer ring 40 is positioned at close The position of pressed end 522.
In the second embodiment shown in Fig. 6, separately offered on sealing insertion support member 50a one be used for house sealing The accepting groove 54a of circle 30, accepting groove 54a's opens up hydraulic part of the position than annular storage tank closer to cooling medium pump.
Under accidental conditions, the present invention ensures that reactor coolant does not leak to environment by sealing ring 30.Complete Under factory's power-off operating mode, the reactor coolant of HTHP is reached at circumferential seal, destroys conventional hermetic circle 30 such as O-ring Sealability, high-temperature high-voltage reaction reactor coolant is caused to leak at high molecular polymer ring 40;Now, high molecular polymer ring 40 heated softenings, and under the pressure of side and bottom high-pressure fluid, it is pressed into the pressed end 522/ of annular storage tank 522a, so as to be brought into close contact with capsul 60 and sealing insertion support member 50/50a, reach guarantee lasting seals, limit therebetween The purpose that reactor coolant processed leaks to environment.
Fig. 7 and Fig. 8 are referred to, for the ease of high molecular polymer ring 40 to be loaded to sealing insertion support member 50/50a ring In shape storage tank, one or two retractable otch 42 is offered on high molecular polymer ring 40.During installation, otch 42 is opened The diameter of high molecular polymer ring 40 can be increased in order to install, otch 42 is closed up after installing, can make again at otch 42 with Capsul 60 and sealing insertion support member 50/50a are brought into close contact and ensure sealing property.Otch 42 is preferably connected structure.
Compared with prior art, the present invention ensures the static of cooling medium pump static pressure axle envelope by high molecular polymer ring 40 Sealing of the part under station blackout operating mode, therefore the dependence to high-temperature resistant rubber O-ring is relieved, and significantly reduce The probability of damage of nuclear power plant's reactor core;Further, since simply support member 50/50a is inserted in the sealing to the first seal assembly to the present invention Outer wall fluting improved, and be correspondingly additionally arranged one ensure under station blackout operating mode sealing high molecular polymer ring 40, therefore there is no any influence to the other structures of cooling medium pump, cooling medium pump is not interfered with yet under accidental conditions Performance.
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 (20)

1. a kind of static pressure gland seal assembly of nuclear power plant's nuclear reactor coolant pump, including multiple sealing groups for being arranged on pump shaft circumference Part;Wherein, the first seal assembly is realized and is located at the circumferential seal between its outside capsul by sealing ring;Its feature exists In:High molecular polymer ring is additionally provided between first seal assembly and capsul;First seal assembly connects with capsul To touch and offer annular storage tank on the outer wall of opening position, the both ends of annular storage tank cross section have different width, wherein compared with The smaller pressed end in big accommodating end is closer to cooling medium pump hydraulic part;High molecular polymer ring houses in nominal situation In the accommodating end of annular storage tank, will soften under station blackout operating mode and be squeezed into annular by high-temperature, high pressure fluid houses The pressed end of groove, so as to be brought into close contact with capsul and the first seal assembly, ensure lasting seals therebetween.
2. the static pressure gland seal assembly of nuclear power plant's nuclear reactor coolant pump according to claim 1, it is characterised in that:It is described The inwall of high molecular polymer ring is inclined design, and when in annular storage tank, its inclined-plane is towards pump shaft and cooling medium pump Direction where hydraulic part.
3. the static pressure gland seal assembly of nuclear power plant's nuclear reactor coolant pump according to claim 1, it is characterised in that:It is described The truncation surface of high molecular polymer ring is right-angled trapezium, and when in annular storage tank, the bottom of right-angled trapezium is towards extruding End, right angle waist are then bonded with capsul.
4. the static pressure gland seal assembly of nuclear power plant's nuclear reactor coolant pump according to claim 1, it is characterised in that:It is described The material of high molecular polymer ring is PEEK, the PEEK containing glass fibre or the PEEK containing carbon fiber.
5. the static pressure gland seal assembly of nuclear power plant's nuclear reactor coolant pump according to claim 1, it is characterised in that:It is described Sealing ring is housed in the accommodating end of annular storage tank together with high molecular polymer ring, and sealing ring is located remotely from pressed end Position, high molecular polymer ring are located at close to the position of pressed end.
6. the static pressure gland seal assembly of nuclear power plant's nuclear reactor coolant pump according to claim 1, it is characterised in that:It is described Support member is inserted in the sealing that first seal assembly includes with capsul directly contacts, and annular storage tank is opened in sealing insertion support On outer wall at part and capsul contact position;A collecting for being used to house sealing ring is separately offered on sealing insertion support member Groove, accepting groove open up position than annular storage tank closer to hydraulic part.
7. the static pressure gland seal assembly of nuclear power plant's nuclear reactor coolant pump according to any one of claim 1 to 6, it is special Sign is:One or two retractable otch is offered on the high molecular polymer ring, in order to high molecular polymer ring Installation in annular storage tank.
8. the static pressure gland seal assembly of nuclear power plant's nuclear reactor coolant pump according to claim 7, it is characterised in that:It is described The otch both ends of high molecular polymer ring are connected structure.
9. the static pressure gland seal assembly of nuclear power plant's nuclear reactor coolant pump according to any one of claim 1 to 6, it is special Sign is:The sealing ring is that conventional O is enclosed or high-temperature resistant rubber O is enclosed.
10. the static pressure gland seal assembly of nuclear power plant's nuclear reactor coolant pump according to any one of claim 1 to 5, its It is characterised by:First seal assembly is a seal assembly near hydraulic part, and it includes rotating ring, stationary ring, sealing Insert and sealing insertion support member;Annular storage tank is opened in sealing insertion support member and the outer wall at capsul contact position On, high molecular polymer ring softens under station blackout operating mode and is squeezed into the extruding of annular storage tank by high-temperature, high pressure fluid Behind end, it will be brought into close contact with capsul and sealing insertion support member.
11. the static pressure gland seal assembly of nuclear power plant's nuclear reactor coolant pump according to any one of claim 1 to 6, its It is characterised by:The static pressure gland seal assembly uses three-level axle envelope, including be successively set between hydraulic part and motor One seal assembly, the second seal assembly and the 3rd seal assembly;Wherein, the first seal assembly is that balanced type Hydrostatic die mould is controllable Leakage sealed, the second seal assembly is pressure-balancing type end face seal, and the 3rd seal assembly is weir formula double seals.
12. a kind of nuclear power plant's nuclear reactor coolant pump, it includes motor, the static pressure gland seal assembly set gradually from top to bottom And hydraulic part, and a pump shaft for running through whole cooling medium pump center;The static pressure gland seal assembly includes being successively set on Multiple seal assemblies between cooling medium pump hydraulic part and motor, these seal assemblies are arranged at the circumference of pump shaft, its In the first seal assembly outside be provided with capsul;First seal assembly realizes that the circumference between capsul is close by sealing ring Envelope;It is characterized in that:High molecular polymer ring is additionally provided between first seal assembly and capsul;First seal assembly exists With offering annular storage tank on the outer wall at capsul contact position, the both ends of annular storage tank cross section have different width Degree, wherein the smaller pressed end in larger accommodating end is closer to cooling medium pump hydraulic part;High molecular polymer ring is normal It is housed in during operating mode in the accommodating end of annular storage tank, will softens under station blackout operating mode and squeezed into by high-temperature, high pressure fluid Enter the pressed end of annular storage tank, so as to being brought into close contact with capsul and the first seal assembly, ensure therebetween lasting close Envelope.
13. nuclear power plant's nuclear reactor coolant pump according to claim 12, it is characterised in that:First seal assembly Support member is inserted in sealing including directly being contacted with capsul, and annular storage tank is opened in sealing insertion support member and connect with capsul On the outer wall for touching opening position, high molecular polymer ring softens under station blackout operating mode and is squeezed into ring by high-temperature, high pressure fluid After the pressed end of shape storage tank, it will be brought into close contact with capsul and sealing insertion support member.
14. nuclear power plant's nuclear reactor coolant pump according to claim 12, it is characterised in that:The high molecular polymer The inwall of ring is inclined design, when in annular storage tank, where its inclined-plane towards pump shaft and cooling medium pump hydraulic part Direction.
15. nuclear power plant's nuclear reactor coolant pump according to claim 12, it is characterised in that:The high molecular polymer The truncation surface of ring is right-angled trapezium, when in annular storage tank, the bottom of right-angled trapezium towards pressed end, right angle waist then with Capsul is bonded.
16. nuclear power plant's nuclear reactor coolant pump according to claim 12, it is characterised in that:The high molecular polymer The material of ring is PEEK, the PEEK containing glass fibre or the PEEK containing carbon fiber.
17. nuclear power plant's nuclear reactor coolant pump according to claim 12, it is characterised in that:The sealing ring and high score Sub- polymer ring is housed in the accommodating end of annular storage tank together, and sealing ring is located remotely from the position of pressed end, macromolecule Polymer ring is located at close to the position of pressed end.
18. nuclear power plant's nuclear reactor coolant pump according to claim 13, it is characterised in that:The sealing insertion support One is separately offered on part and is used to housing the accepting groove of sealing ring, accepting groove opens up position than annular storage tank closer to waterpower Part.
19. nuclear power plant's nuclear reactor coolant pump according to any one of claim 12 to 18, it is characterised in that:It is described One or two retractable otch is offered on high molecular polymer ring, in order to which high molecular polymer ring is in annular storage tank Interior installation.
20. nuclear power plant's nuclear reactor coolant pump according to claim 12, it is characterised in that:First seal assembly It is a seal assembly near hydraulic part, it includes rotating ring, stationary ring, sealing insert and sealing insertion support member.
CN201410665419.9A 2014-11-19 2014-11-19 Nuclear power plant's nuclear reactor coolant pump and its static pressure gland seal assembly Active CN105673551B (en)

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CN1101406A (en) * 1993-09-16 1995-04-12 约翰起重机有限公司 Shaft seal
CN1200446A (en) * 1997-05-23 1998-12-02 卡尔·弗罗伊登伯格公司 Sealing structure
WO2008141377A1 (en) * 2007-05-18 2008-11-27 Apc Company Pty Ltd Seal assembly
CN102338119A (en) * 2011-10-08 2012-02-01 江苏振华泵业制造有限公司 Sealing device of multistage centrifugal pump
CN203272221U (en) * 2013-05-22 2013-11-06 哈尔滨电气动力装备有限公司 Fluid dynamic pressure three-level mechanical sealing device of reactor coolant pump
CN203783954U (en) * 2014-02-21 2014-08-20 清华大学 Nuclear main pump three-level mechanical sealing device with passive parking sealing device
CN104040226A (en) * 2012-01-04 2014-09-10 阿海珐核能公司 Passive Shutdown Sealing Device For A System Of Shaft Seals Of A Primary Motorized Pump Unit

Patent Citations (7)

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Publication number Priority date Publication date Assignee Title
CN1101406A (en) * 1993-09-16 1995-04-12 约翰起重机有限公司 Shaft seal
CN1200446A (en) * 1997-05-23 1998-12-02 卡尔·弗罗伊登伯格公司 Sealing structure
WO2008141377A1 (en) * 2007-05-18 2008-11-27 Apc Company Pty Ltd Seal assembly
CN102338119A (en) * 2011-10-08 2012-02-01 江苏振华泵业制造有限公司 Sealing device of multistage centrifugal pump
CN104040226A (en) * 2012-01-04 2014-09-10 阿海珐核能公司 Passive Shutdown Sealing Device For A System Of Shaft Seals Of A Primary Motorized Pump Unit
CN203272221U (en) * 2013-05-22 2013-11-06 哈尔滨电气动力装备有限公司 Fluid dynamic pressure three-level mechanical sealing device of reactor coolant pump
CN203783954U (en) * 2014-02-21 2014-08-20 清华大学 Nuclear main pump three-level mechanical sealing device with passive parking sealing device

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