CN203783954U - Nuclear main pump three-level mechanical sealing device with passive parking sealing device - Google Patents

Nuclear main pump three-level mechanical sealing device with passive parking sealing device Download PDF

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Publication number
CN203783954U
CN203783954U CN201420076740.9U CN201420076740U CN203783954U CN 203783954 U CN203783954 U CN 203783954U CN 201420076740 U CN201420076740 U CN 201420076740U CN 203783954 U CN203783954 U CN 203783954U
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CN
China
Prior art keywords
sealing
seal
level
main pump
mechanical seal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201420076740.9U
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Chinese (zh)
Inventor
刘莹
高志
丁泽
黄伟峰
刘向锋
李永健
王子羲
王玉明
李鲲
张�杰
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Tsinghua University
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Tsinghua University
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Priority to CN201420076740.9U priority Critical patent/CN203783954U/en
Application granted granted Critical
Publication of CN203783954U publication Critical patent/CN203783954U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a nuclear main pump three-level mechanical sealing device with a passive parking sealing device. A passive parking seal is positioned below a first-level mechanical seal or between a first-level mechanical seal and a second-level mechanical seal or between the second-level seal and the third-level seal; a passive sealing assembly comprises a moving ring, a static seal fixed on the moving ring and a fixing ring; the passive parking sealing assembly and an inner cavity body with a static seal action surface are oppositely arranged to form a passive parking sealing system; a sealing function is realized by the static sealing between the passive parking sealing assembly and the inner cavity body; when a coolant main pump is haled as an SBO station occurs in a nuclear station, or as each level of sealing of the main pump is failed, a high-temperature and high-pressure coolant with radiation axially flows along a main pump shaft, the passive parking seal is automatically actuated under high-temperature or high-pressure driving, the leakage of a reactor coolant is prevented, the environment pollution possibly caused by the nuclear leakage is reduced and time is earned for disposing emergent conditions.

Description

A kind of core main pump three-stage mechanical seal device with non-active parking sealing arrangement
Technical field
The utility model relates to core main pump mechanical sealing system, particularly a kind of core main pump three-stage mechanical seal device with non-active parking sealing arrangement.
Background technique
Reactor coolant pump (being core main pump) mechanical seal device is the core component in reactor coolant pump, directly affects the safety and reliability of core main pump operation.If sealing is leaked, not only bring huge economic loss, and can cause serious radiation pollution to environment.At present, core main pump is unique equipment of not realizing localization Design in China's nuclear power station, and its manufacturing market is also monopolized by the developed country such as American-European-Japanese for a long time.The main mechanical sealing device used for pump of core being widely adopted is at present generally three-stage mechanical seal, can be divided into two large classes, and one is Hydrostatic pressure type, and its structure is that the first order adopts Hydrostatic pressure type, and second and third level adopts contacting mechanical seal structure; Another kind is hydrodynamic formula, and its structure is three grades of hydrodynamic mechanical seals that all adopt same structure.Above two kinds of mechanical seal forms lost efficacy under (SBO) operating mode in electric power system, and three grades of sealings all can be lost efficacy, and cannot stop the leakage of reactor radioactivity freezing mixture.The scheme (seeing Chinese patent CN103269030A) of refrigerant leaks while having proposed to utilize parking sealer to prevent the shutdown of core main pump or three-stage mechanical seal inefficacy in published technology.But still Shortcomings of this technology can not provide the reliable sealing of core main pump under SBO operating mode.In the Fukushima nuclear power plant accident occurring for 2011, when reacting heap shutdown, because causing power supply system, blast lost efficacy, there is SBO operating mode, can not be acted in time by power-actuated supplementary security system, cause radioactive material leakage.Still there is certain potential safety hazard in visible current reactor coolant pump mechanical sealing system, need to design a kind of new core main pump three-stage mechanical seal system with non-active parking sealing arrangement, make core main pump under SBO operating mode, provide reliable sealing, ensure to be with active freezing mixture not leak.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the purpose of this utility model is to provide a kind of core main pump three-stage mechanical seal device with non-active parking sealing arrangement, under (SBO) operating mode is lost efficacy in electric power system, provided reliable sealing, and ensured to be with active freezing mixture not leak.
In order to achieve the above object, the technological scheme that the utility model is taked is:
A kind of core main pump three-stage mechanical seal device with non-active parking sealing arrangement, comprise main shaft 1, first order mechanical sealing assembly 2, second level mechanical sealing assembly 5, third level mechanical sealing assembly 6 and non-energy dynamic sealing assembly 4, first order mechanical seal, second level mechanical seal, third level mechanical seal series connection, position C between the position B between non-position A or first and second grade of mechanical seal that can dynamic sealing assembly 4 be arranged in first order mechanical seal below or second and third grade of mechanical seal.
Described non-can comprising shift(ing) ring 4-2, be fixed on static seal 4-1 and retaining ring 4-3 on shift(ing) ring 4-2 by dynamic sealing assembly 4, non-active parking sealer assembly 4 and the relative installation of inner chamber body 3 with static seal acting surface, formed non-active parking sealer system, its sealing function is to realize by the static seal 4-1 between non-active parking sealer assembly 4 and inner chamber body 3.
Described three-stage mechanical seal system is not limited to specific design proposal, comprises that the fluid machinery of all utilization hydrostatic pressures, hydrodynamic and hydrodynamic and static pressure combination seals the core main pump gland seal system being in series.
The beneficial effects of the utility model are:
The utility model has adopted the non-energy dynamic seal apparatus that does not need external energy driving as the safety installations of core main pump three-stage mechanical seal system.Under SBO operating mode, non-energy dynamic seal apparatus can not need extraneous energy supply, does not need automatically to start in extraneous situation about controlling, and plays the effect of parking sealer, avoids the leakage of radioactivity freezing mixture, and reliable sealing is provided.
Brief description of the drawings
Accompanying drawing is the utility model structural representation.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail.
Referring to accompanying drawing, a kind of core main pump three-stage mechanical seal device with non-active parking sealing arrangement, comprise main shaft 1, first order mechanical sealing assembly 2, second level mechanical sealing assembly 5, third level mechanical sealing assembly 6 and non-energy dynamic sealing assembly 4, first order mechanical seal, second level mechanical seal, third level mechanical seal series connection, non-energy dynamic sealing assembly 4 is arranged in the position A of first order mechanical seal below, or position B between first and second grade of mechanical seal, or position C between second and third grade of mechanical seal.
Taking position B as example, described non-can comprising shift(ing) ring 4-2, be fixed on static seal 4-1 and retaining ring 4-3 on shift(ing) ring 4-2 by dynamic sealing assembly 4, non-active parking sealer assembly 4 and the relative installation of inner chamber body 3 with static seal acting surface, formed non-active parking sealer system, its sealing function is to realize by the static seal 4-1 between non-active parking sealer assembly 4 and inner chamber body 3.
Described three-stage mechanical seal system is not limited to specific design proposal, comprises that the fluid machinery of all utilization hydrostatic pressures, hydrodynamic and hydrodynamic and static pressure combination seals the core main pump gland seal system being in series.
Working principle of the present utility model is:
In the time reacting core main pump in SBO operating mode, coolant pump lost efficacy, and high temperature, pressure coolant axially flow out along pump shaft, and now non-active parking sealer ambient temperature raises fast, and cavity pressure is greater than barometric pressure.When mechanical seal was lost efficacy, or when main shaft 1 stall, under freezing mixture high temperature or high drive that non-shift(ing) ring 4-2 in can dynamic sealing assembly 4 flows into below by main shaft, make itself and retaining ring 4-3 produce vertically relative movement, thereby make the static seal face laminating of static seal 4-1 and inner chamber body 3, form parking sealer, ensure to be with active freezing mixture not leak, for treatment S BO operating mode has been striven for the time.
Content described in this specification embodiment is only enumerating of way of realization to model utility design; protection domain of the present utility model should not be regarded as only limiting to the concrete form that embodiment states, protection domain of the present utility model also and conceive the equivalent technologies means that can expect according to the utility model in those skilled in the art.

Claims (1)

1. one kind has the core main pump three-stage mechanical seal device of non-active parking sealing arrangement, comprise main shaft (1), first order mechanical sealing assembly (2), second level mechanical sealing assembly (5), third level mechanical sealing assembly (6) and non-energy dynamic sealing assembly (4), it is characterized in that: first order mechanical seal, second level mechanical seal, third level mechanical seal series connection, non-energy dynamic sealing assembly (4) is arranged in the position A or first of first order mechanical seal below, position B between secondary mechanical seal, or second, position C between three-stage mechanical seal,
Described non-can comprising shift(ing) ring (4-2), be fixed on static seal (4-1) and retaining ring (4-3) on shift(ing) ring (4-2) by dynamic sealing assembly (4), non-active parking sealer assembly (4) and the relative installation of inner chamber body (3) with static seal acting surface, formed non-active parking sealer system, its sealing function is to realize by the static seal (4-1) between non-active parking sealer assembly (4) and inner chamber body (3).
CN201420076740.9U 2014-02-21 2014-02-21 Nuclear main pump three-level mechanical sealing device with passive parking sealing device Expired - Fee Related CN203783954U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420076740.9U CN203783954U (en) 2014-02-21 2014-02-21 Nuclear main pump three-level mechanical sealing device with passive parking sealing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420076740.9U CN203783954U (en) 2014-02-21 2014-02-21 Nuclear main pump three-level mechanical sealing device with passive parking sealing device

Publications (1)

Publication Number Publication Date
CN203783954U true CN203783954U (en) 2014-08-20

Family

ID=51320146

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201420076740.9U Expired - Fee Related CN203783954U (en) 2014-02-21 2014-02-21 Nuclear main pump three-level mechanical sealing device with passive parking sealing device

Country Status (1)

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CN (1) CN203783954U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105673551A (en) * 2014-11-19 2016-06-15 中广核工程有限公司 Nuclear power plant nuclear reactor coolant pump and static-pressure shaft seal assembly thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105673551A (en) * 2014-11-19 2016-06-15 中广核工程有限公司 Nuclear power plant nuclear reactor coolant pump and static-pressure shaft seal assembly thereof
CN105673551B (en) * 2014-11-19 2018-03-06 中广核工程有限公司 Nuclear power plant's nuclear reactor coolant pump and its static pressure gland seal assembly

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20140820

Termination date: 20180221