CN103646674A - C-shaped sealing ring - Google Patents
C-shaped sealing ring Download PDFInfo
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- CN103646674A CN103646674A CN201310636484.4A CN201310636484A CN103646674A CN 103646674 A CN103646674 A CN 103646674A CN 201310636484 A CN201310636484 A CN 201310636484A CN 103646674 A CN103646674 A CN 103646674A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention discloses a C-shaped ring. The C-shaped ring comprises a hollow and annular cladding layer, a middle layer and an internally-installed layer, wherein the middle layer is contained in a hollow structure of the cladding layer and tightly clings to the inner wall of the cladding layer; the internally-installed layer is arranged in the hollow structure of the cladding layer and clings to the inner wall of the middle layer; the sections of the cladding layer and the middle layer are in a C-shaped structure; the internally-installed layer is an annular spiral tightening spring wound by a normal-quadrangular-shaped wire and front and rear ends of the spiral tightening spring are welded; a smooth cladding surface is formed on the outer surface of the spiral tightening spring; the cladding surface tightly clings to the inner wall of the middle layer. The C-shaped ring has a high sealing performance; when a medium pressure or/and a temperature is/are changed, the stability of a sealing performance is kept by a compression-rebounding property of the spiral tightening spring and the sealing performance of a reactor pressure vessel is guaranteed; the C-shaped ring can be adaptive to high temperatures, high pressures, instant large temperature difference, and instant pressure fluctuation working conditions of a nuclear power station; meanwhile, the machining difficulty is greatly reduced.
Description
Technical field
The present invention relates to nuclear power plant reactor sealing for pressure vessels field, relate in particular to C type sealing ring for a kind of reactor pressure vessel.
Background technology
At present, presurized water reactor is the main flow heap type of nuclear power station, the reactor in the whole world approximately 60% is all presurized water reactor, pressurized-water reactor nuclear power plant is generally divided into two loops: a circuit system and secondary coolant circuit system, one circuit system is called nuclear island part, secondary coolant circuit system is conventional island part, has steam turbine part and master section.One circuit system and the secondary coolant circuit system of pressurized-water reactor nuclear power plant separate completely, and it is an airtight circulation system.The principle process of nuclear power station is: main pump is sent pressure coolant into reactor, and the heat energy that cooling medium is emitted nuclear fuel is taken reactor out of, and enters steam generator, by heat-transfer pipe, heat is passed to the secondary circuit water outside pipe, makes water boiling produce steam; Coolant flow, after steam generator, then is sent into reactor by main pump, and circulation, constantly takes and change generation steam out of the heat in reactor so back and forth, from steam generator high temperature and high pressure steam out, promotes Turbo-generator Set generating.The waste vapour of doing merit condenses into water in condenser, then sends into well heater by the feed pump that condenses, and after reheating, sends steam generator back to, the secondary circuit circulation system that Here it is.
Wherein, nuclear power plant reactor pressure vessel is comprised of cylindrical shell and top cover two parts, between cylindrical shell and top cover, by shell flange, top cover flange and seal, is realized and being tightly connected.The existence of seal has guaranteed that the leakage rate of cooling medium in pressure vessel can maintain in allowed limits.At present, the seal that China's nuclear power plant reactor pressure vessel is used and the material using thereof are external product, because this product is the staple product relevant to nuclear safety, therefore the difficulty of nuclear power unit of operation application home products is larger.Yet the cost of a set of sealing for pressure vessels part needs hundreds of thousands, and often open primary first-order equation heap top cover with regard to needing more transducer set seal, caused thus the expensive of seal.Therefore, seal production domesticization is not only of great importance in economic benefit, and Chinese Nuclear Power localization process is had to important strategic importance.
As everyone knows, the cooling medium in pressure vessel has high radioactivity, if occur to leak will serious threat society safety.Therefore,, when nuclear power station unit normally moves, require seal can bear high temperature, high pressure operating mode; During Unit Commitment heap, seal will bear the large action of thermal difference that lifting/lowering temperature speed reaches 28 ℃/h, and in some cases, the transient state temperature difference also likely reaches 128 ℃; In addition, under some transient condition of the normal operation of unit, seal also will bear the effect of pressure surge.Thus the sealing property of seal has been proposed to very high requirement, these requirements are that conventional seal institute is unappeasable; For meeting the high request of above-mentioned sealing property, the structure of seal has its singularity, and its structural singularity causes the difficulty of its processing technology larger.
Therefore, be necessary to develop a kind of seal that can adapt to nuclear power station high temperature, high pressure and the instantaneous large temperature difference, pressure surge operating mode, guarantee the sealing property of reactor pressure vessel, to guarantee the safe operation of nuclear power station, reduce its difficulty of processing simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of seal that can adapt to nuclear power station high temperature, high pressure and the instantaneous large temperature difference, pressure surge operating mode, guarantee the sealing property of reactor pressure vessel, to guarantee the safe operation of nuclear power station, its difficulty of processing reduces greatly simultaneously.
For achieving the above object, technical scheme of the present invention is: a kind of C type sealing ring is provided, it is applicable to reactor pressure vessel, described C type sealing ring is circular, described C type sealing ring comprises the clad that is hollow circular ring shape, middle layer and build-up layer, described middle layer is placed in the hollow structure of described clad and is close to the inwall of described clad, described build-up layer is placed in the hollow structure in described middle layer and is close to the inwall in described middle layer, and described clad, the cross section in described middle layer is c-shaped structure all, wherein, be circular spiral the tight spring of described build-up layer for forming by a Wire-winding that is four-prism shape, the head and the tail of described spiral tight spring weld mutually, and the outside surface of described spiral tight spring forms smooth coated face, described coated face is close to the inwall in described middle layer.
Preferably, described silk material is nickel base superalloy material, in described nickel base superalloy, the mass percentage content of cobalt is less than or equal to 0.1%, and the mass percentage content of copper is less than or equal to 0.2%, and the grain size number of described nickel base superalloy silk material is more than or equal to 5 grades.Adopt the nickel base superalloy silk material of production domesticization to produce spiral tight spring, can not only significantly reduce the production cost of C type sealing ring, and Chinese Nuclear Power localization process is had to important strategic importance.
Preferably, described middle layer is by the band roll-forming of a nichrome material, the head and the tail of described band weld mutually, wherein, in described nichrome, the mass percentage content of cobalt is less than or equal to 0.1%, the mass percentage content of copper is less than or equal to 0.2%, and the grain size number of described nichrome band is more than or equal to 5 grades.The nichrome band production middle layer that adopts production domesticization, can not only significantly reduce the production cost of C type sealing ring, and Chinese Nuclear Power localization process is had to important strategic importance.
Preferably, described clad is with roll-forming by silver, and the head and the tail of described silver band weld mutually, and in described silver band, the purity of silver is more than or equal to 99.99%.Because silver-colored hardness is less than the hardness of nichrome, therefore, clad has high-ductility, thereby plays the effect of making up preferably when it is contacted with the sealing surface in middle layer.
Preferably, the temperature rate that described C type sealing ring can bear is more than or equal to 28 ℃/h.
Preferably, in heating and cooling process, the slip of described C type sealing ring is less than or equal to 0.1L/h; When temperature, pressure stability, described C type sealing ring is without leakage.
Preferably, described clad circumferentially offers the first opening along it, and described middle layer circumferentially offers the second opening along it, and described the first opening is corresponding with described the second opening and be communicated with.
Compared with prior art, due to C type sealing ring of the present invention, it comprises the clad that is hollow circular ring shape, middle layer and build-up layer, described middle layer is placed in the hollow structure of described clad and is close to the inwall of described clad, described build-up layer is placed in the hollow structure in described middle layer and is close to the inwall in described middle layer, and described clad, the cross section in described middle layer is c-shaped structure all, wherein, be circular spiral the tight spring of described build-up layer for forming by a Wire-winding that is four-prism shape, the head and the tail of described spiral tight spring weld mutually, and the outside surface of described spiral tight spring forms smooth coated face, described coated face is close to the inwall in described middle layer.During work, C type sealing ring is impaction state under bolt pretightening effect, and itself and sealing surface fit tightly and play sealing function; Because spiral tight spring adopt the Wire-winding that is four-prism shape to form, so its radial compression-rebound characteristics obtained further optimization, promoted sealing property; And the smooth coated face of spiral tight spring is close to the inwall in middle layer, compare with the undulatory coated face of the spiral that adopts cylindrical Wire-winding to become tight spring, its smooth coated face is without the gap at turn top, so complete gapless between its coated face and the inwall in middle layer, therefore load distribution is more even, thereby promotes linear sealing performance; Therefore when pressure medium or/and temperature while occurring changing, is kept the stability of sealing property by compression-rebound characteristics of spiral tight spring, thereby the sealing property of assurance reactor pressure vessel is guaranteed the safe operation of nuclear power station; And the smooth coated face of spiral tight spring, the processing technology difficulty while making middle layer coated reduces greatly; And this C type sealing ring can adapt to nuclear power station high temperature, high pressure and the instantaneous large temperature difference, pressure surge operating mode.
Accompanying drawing explanation
Fig. 1 is the structural representation of C type sealing ring of the present invention.
Fig. 2 is the part enlarged diagram of C type sealing ring in Fig. 1.
Fig. 3 is the schematic cross-section of Fig. 2.
Fig. 4 is the cut-open view along A-A line in Fig. 1.
Fig. 5 is the cut-open view along B-B line in Fig. 4.
Fig. 6 is the cut-open view that is equiped with the reactor pressure vessel of C type sealing ring of the present invention.
Fig. 7 is the enlarged diagram of A part in Fig. 6.
Fig. 8 is the enlarged diagram of B part in Fig. 7.
Embodiment
With reference now to accompanying drawing, describe embodiments of the invention, in accompanying drawing, similarly element numbers represents similar element.C type sealing ring 1 provided by the invention, can adapt to nuclear power station high temperature, high pressure and the instantaneous large temperature difference, pressure surge operating mode, guarantees the sealing property of reactor pressure vessel, and to guarantee the safe operation of nuclear power station, its difficulty of processing reduces greatly simultaneously.
As shown in Figure 1, C type sealing ring 1 provided by the present invention, it is circular, and C type sealing ring 1 of the present invention is major diameter sealing ring, and preferably, C type sealing ring 1 of the present invention is mainly that diameter is the C type sealing ring of 3983.1mm, two kinds of models of 4071.1mm.
As Figure 1-Figure 5, described C type sealing ring 1 comprises clad 11, middle layer 12 and the build-up layer 13 that is hollow circular ring shape, described middle layer 12 is placed in the hollow structure of described clad 11 and is close to the inwall of described clad 11, described build-up layer 13 is placed in the hollow structure in described middle layer 12 and is close to the inwall in described middle layer 12, and the cross section in described clad 11, described middle layer 12 is c-shaped structure (see figure 4) all, therefore sealing ring of the present invention is called C type sealing ring 1.
C type sealing ring 1 of the present invention, middle layer 12 is closely coated on outside build-up layer 13, and sealing function, for spacer medium and environment, is played in middle layer 12; Clad 11 is closely coated on outside middle layer 12, thereby clad 11 has and when high-ductility makes it contact with the sealing surface in middle layer 12, plays the effect of making up.Particularly, described clad 11 circumferentially offers the first opening 111 along it, described middle layer 12 circumferentially offers the second opening 121 along it, clad 11 be coated on middle layer 12 outer after, described the first opening 111 is corresponding with described the second opening 121 and be communicated with into a whole opening (see figure 4); Therefore, the equal c-shaped structure in the cross section in described clad 11, described middle layer 12; After C type sealing ring 1 is installed, the first opening 111 and described the second opening 121 are positioned at the pressure-bearing side opposite face (referring to aftermentioned) of C type sealing ring 1, the deformation of sealing surface when adapting to medium working conditions change.
As Figure 2-Figure 5, described build-up layer 13 is circular spiral the tight springs that are that form by a Wire-winding that is four-prism shape, and the head and the tail of described spiral tight spring weld mutually.And the Wire-winding that is four-prism shape due to employing forms spiral tight spring, stickiness between each circle of spiral tight spring is better, therefore, the outside surface of spiral tight spring forms a continuous and smooth coated face, after middle layer 12 is coated on outside spiral tight spring, described coated face is close to the inwall in described middle layer 12, compare with the undulatory coated face of the spiral that adopts cylindrical Wire-winding to become tight spring, the smooth coated face of spiral of the present invention tight spring does not have the gap on turn top, therefore, complete gapless (as shown in Figure 5) between spiral of the present invention the tight coated face of spring and the inwall in middle layer 12, therefore, the load of spiral tight spring distributes more even, thereby promoted linear sealing performance.In addition, the outside surface of spiral tight spring forms a continuous and smooth coated face (seeing shown in Fig. 3, Fig. 4), compare with the undulatory coated face of the spiral that adopts cylindrical Wire-winding to become tight spring, between spiral of the present invention the tight coated face of spring and the inwall in middle layer 12, can better fit, therefore the coated processing technology difficulty in middle layer 12 be reduced greatly.
In addition, employing is the spiral of Wire-winding formation the also tight spring of spiral of tight spring and the cylindrical Wire-winding one-tenth of employing of four-prism shape and compares, if it is identical with the bottom surface diameter of cylindrical thread material to be the bottom surface length of side of silk material of four-prism shape, as shown in Figure 5, the silk material that spiral of the present invention tight spring are used is four-prism shape, therefore, the cross section of this material is square, supposes that this foursquare length of side is L; Correspondingly, the cross section of cylindrical silk material is rounded, and this circular diameter is also L; By stress analysis, calculate known, the radial shape variable coefficient of spiral of the present invention tight spring is greater than and adopts the spiral of aforementioned cylindrical silk material formation the radial shape variable coefficient of tight spring, therefore, employing is spiral the tight spring that four-prism shape silk material forms, its compression and back-bullet characteristic has radially obtained further optimization, has therefore promoted sealing property.
In the present invention, described spiral tight spring adopt the Wire-winding of nickel base superalloy material to form, in described nickel base superalloy, the mass percentage content of cobalt is less than or equal to 0.1%, the mass percentage content of copper is less than or equal to 0.2%, and the grain size number of described nickel base superalloy silk material is more than or equal to 5 grades.Preferably, the material of described silk material is GH4145 alloy, GH4145 alloy is mainly to carry out mutually the nickel base superalloy of ageing strengthening with γ ＇, it has good corrosion-resistant and antioxygenic property below at 980 ℃, at 800 ℃, there is below higher intensity, at 540 ℃, there is below good resistance to relaxation property, also there is good forming property and welding performance simultaneously.This alloy is mainly for the manufacture of working below and higher resistance to lax plane spring and the volute springs of desired strength at 800 ℃.Therefore, adopt silk material manufacture spiral of the present invention the tight spring of this material, it has good rebound characteristics, thereby guarantees sealing property.
In addition, in the present invention, nickel base superalloy silk material, before the also tight spring for coiling spiral, need to carry out EDDY CURRENT to it, to guarantee the quality of a material and spiral tight spring.
Preferably, described clad 11 rolls formation by silver band, and weld mutually the two ends of described silver band, and therefore, whole silver band only has a welding joint.And in silver band, the purity of silver is more than or equal to 99.99%, and requires silver to have low-down air content.Because silver-colored hardness is less than the hardness of nichrome, therefore, clad 11 has high-ductility, thereby plays the effect of making up preferably when it is contacted with the sealing surface in middle layer 12.
The clad 11 of C type sealing ring 1 of the present invention is made by silver band, make by GH600 band in middle layer 12, build-up layer 13 adopts GH4145 alloy to make, clad 11, middle layer 12 and build-up layer 13 all adopt home made materials to make, the C type sealing ring 1 of preparing compared to available technology adopting foreign material, production cost significantly reduces, and Chinese Nuclear Power localization process is had to important strategic importance.
In addition, temperature rate >=28 that C type sealing ring 1 of the present invention can bear ℃/h.And in heating and cooling process, leakage rate is necessary≤0.1L/h; When temperature, pressure are all stablized, there is not any leakage and abnormal occurrence in C type sealing ring 1, so the laminating acceptance criteria of C type sealing ring 1.The required temperature rate bearing of above-mentioned C type sealing ring 1, its leakage rate in heating and cooling excessively, the technology being well known to the skilled person.
Consult below shown in Fig. 6-Fig. 8, the concrete application of C type sealing ring 1 of the present invention is described.
As shown in Figure 6, nuclear power plant reactor pressure vessel 2 comprises cylindrical shell 21 and top cover 22, wherein, cylindrical shell 21 is provided with cooling medium and imports and exports ozzle 212, and the upper end of cylindrical shell 21 is provided with shell flange 211, on top cover 22, be provided with the top cover flange 221 corresponding with shell flange 211, cylindrical shell 21 is tightly connected by shell flange 211, top cover flange 221 mutually with top cover 22, and is provided with at least one C type sealing ring 1 between shell flange 211, top cover flange 221.
In the present embodiment, between shell flange 211, top cover flange 221, be provided with twice C type sealing ring 1.Particularly, offer the storage tank 222 corresponding with C type sealing ring 1 on top cover flange 221, C type sealing ring 1 correspondence is placed in described storage tank 222, and is also provided with fixture 3 with fixation of C type sealing ring 1 in a side of storage tank 222.Wherein, fixture 3 comprises securing member 31 and geometrical clamp 32, geometrical clamp 32 has a fixed part 321, from one end bending of fixed part 321, extend to form a clamping part 322, therefore, geometrical clamp 32 is bending, fixed part 321 is fixed on top cover flange 221 by securing member 31 and is positioned at a side of storage tank 222, clamping part 322 is to the interior extension of storage tank 222 and press on the outer wall of C type sealing ring 1, and the first opening 111 on C type sealing ring 1, the second opening 121 is positioned at the side away from clamping part 322, also be the first opening 111, the second opening 121 is positioned at the opposite face of pressure-bearing side.Wherein, described securing member 31 is preferably trip bolt, but not as limit.During work, C type sealing ring 1 presents impaction state under bolt pretightening effect, fits tightly and plays sealing function with sealing surface; When pressure medium or/and temperature while occur changing, is kept the stability of sealing property by compression-rebound characteristics of built-in spiral tight spring.
Due to C type sealing ring 1 of the present invention, it comprises the clad 11 that is hollow circular ring shape, middle layer 12 and build-up layer 13, described middle layer 12 is placed in the hollow structure of described clad 11 and is close to the inwall of described clad 11, described build-up layer 13 is placed in the hollow structure in described middle layer 12 and is close to the inwall in described middle layer 12, and described clad 11, the cross section in described middle layer 12 is c-shaped structure all, wherein, be circular spiral the tight spring of described build-up layer 13 for forming by a Wire-winding that is four-prism shape, the head and the tail of described spiral tight spring weld mutually, and the outside surface of described spiral tight spring forms smooth coated face, described coated face is close to the inwall in described middle layer 12.During work, C type sealing ring 1 is impaction state under bolt pretightening effect, and itself and sealing surface fit tightly and play sealing function; Because spiral tight spring adopt the Wire-winding that is four-prism shape to form, so its radial compression-rebound characteristics obtained further optimization, promoted sealing property; And the smooth coated face of spiral tight spring is close to the inwall in middle layer 12, compare with the undulatory coated face of the spiral that adopts cylindrical Wire-winding to become tight spring, its smooth coated face is without the gap at turn top, so complete gapless between its coated face and the inwall in middle layer 12, therefore load distribution is more even, thereby promotes linear sealing performance; Therefore when pressure medium or/and temperature while occurring changing, is kept the stability of sealing property by compression-rebound characteristics of spiral tight spring, thereby the sealing property of assurance reactor pressure vessel is guaranteed the safe operation of nuclear power station; And the smooth coated face of spiral tight spring, the processing technology difficulty while making middle layer 12 coated reduces greatly; And this C type sealing ring 1 can adapt to nuclear power station high temperature, high pressure and the instantaneous large temperature difference, pressure surge operating mode.
Above disclosed is only the preferred embodiments of the present invention, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to the present patent application the scope of the claims, still belongs to the scope that the present invention is contained.
Claims (7)
1. a C type sealing ring, be applicable to reactor pressure vessel, described C type sealing ring is circular, it is characterized in that: described C type sealing ring comprises the clad that is hollow circular ring shape, middle layer and build-up layer, described middle layer is placed in the hollow structure of described clad and is close to the inwall of described clad, described build-up layer is placed in the hollow structure in described middle layer and is close to the inwall in described middle layer, and described clad, the cross section in described middle layer is c-shaped structure all, wherein, be circular spiral the tight spring of described build-up layer for forming by a Wire-winding that is four-prism shape, the head and the tail of described spiral tight spring weld mutually, and the outside surface of described spiral tight spring forms smooth coated face, described coated face is close to the inwall in described middle layer.
2. C type sealing ring as claimed in claim 1, it is characterized in that: described silk material is nickel base superalloy material, in described nickel base superalloy, the mass percentage content of cobalt is less than or equal to 0.1%, the mass percentage content of copper is less than or equal to 0.2%, and the grain size number of described nickel base superalloy silk material is more than or equal to 5 grades.
3. C type sealing ring as claimed in claim 1, it is characterized in that: described middle layer is by the band roll-forming of a nichrome material, the head and the tail of described band weld mutually, wherein, in described nichrome, the mass percentage content of cobalt is less than or equal to 0.1%, the mass percentage content of copper is less than or equal to 0.2%, and the grain size number of described nichrome band is more than or equal to 5 grades.
4. C type sealing ring as claimed in claim 1, is characterized in that: described clad is with roll-forming by silver, and the head and the tail of described silver band weld mutually, and in described silver band, the purity of silver is more than or equal to 99.99%.
5. C type sealing ring as claimed in claim 1, is characterized in that: the temperature rate that described C type sealing ring can bear is more than or equal to 28 ℃/h.
6. C type sealing ring as claimed in claim 1, is characterized in that: in heating and cooling process, the slip of described C type sealing ring is less than or equal to 0.1L/h; When temperature, pressure stability, described C type sealing ring is without leakage.
7. C type sealing ring as claimed in claim 1, is characterized in that: described clad circumferentially offers the first opening along it, and described middle layer circumferentially offers the second opening along it, and described the first opening is corresponding with described the second opening and be communicated with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310636484.4A CN103646674A (en) | 2013-11-27 | 2013-11-27 | C-shaped sealing ring |
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| CN201310636484.4A CN103646674A (en) | 2013-11-27 | 2013-11-27 | C-shaped sealing ring |
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| CN103646674A true CN103646674A (en) | 2014-03-19 |
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| CN201310636484.4A Pending CN103646674A (en) | 2013-11-27 | 2013-11-27 | C-shaped sealing ring |
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Cited By (3)
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| CN104625647A (en) * | 2015-01-17 | 2015-05-20 | 哈尔滨东安实业发展有限公司 | Metal energy storage spring machining method |
| CN106935283A (en) * | 2015-11-16 | 2017-07-07 | 通用电气-日立核能美国有限责任公司 | Nuclear reactor stream sealing system and seal |
| CN114321378A (en) * | 2021-12-31 | 2022-04-12 | 北京化工大学 | Low-leakage high-flow-resistance built-in channel alloy cast iron elastic sealing structure |
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|---|---|---|---|---|
| CN104625647A (en) * | 2015-01-17 | 2015-05-20 | 哈尔滨东安实业发展有限公司 | Metal energy storage spring machining method |
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| CN114321378A (en) * | 2021-12-31 | 2022-04-12 | 北京化工大学 | Low-leakage high-flow-resistance built-in channel alloy cast iron elastic sealing structure |
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Application publication date: 20140319 |
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