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 PDFInfo
- 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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- China
- Prior art keywords
- seal
- sealing
- level
- main pump
- mechanical seal
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- Expired - Fee Related
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- 238000007789 sealing Methods 0.000 title claims abstract description 49
- 230000003068 static effect Effects 0.000 claims abstract description 16
- 238000009434 installation Methods 0.000 claims description 4
- 239000002826 coolant Substances 0.000 abstract description 8
- 230000005855 radiation Effects 0.000 abstract description 2
- 239000000659 freezing mixture Substances 0.000 description 6
- 230000002706 hydrostatic effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 210000004907 gland Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000012857 radioactive material Substances 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
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- Structures Of Non-Positive Displacement Pumps (AREA)
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
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).
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)
| Country | Link |
|---|---|
| CN (1) | CN203783954U (en) |
Cited By (2)
| 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 |
| CN108760156A (en) * | 2018-07-25 | 2018-11-06 | 哈尔滨电气动力装备有限公司 | The experimental rig of core main pump self-loopa oil pump and oily mechanical sealing performance |
-
2014
- 2014-02-21 CN CN201420076740.9U patent/CN203783954U/en not_active Expired - Fee Related
Cited By (4)
| 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 |
| CN108760156A (en) * | 2018-07-25 | 2018-11-06 | 哈尔滨电气动力装备有限公司 | The experimental rig of core main pump self-loopa oil pump and oily mechanical sealing performance |
| CN108760156B (en) * | 2018-07-25 | 2023-12-26 | 哈尔滨电气动力装备有限公司 | Nuclear self-circulation oil pump and oil mechanical sealing performance test device for main pump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |