CN203272221U - Fluid dynamic pressure three-level mechanical sealing device of reactor coolant pump - Google Patents
Fluid dynamic pressure three-level mechanical sealing device of reactor coolant pump Download PDFInfo
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- CN203272221U CN203272221U CN 201320284923 CN201320284923U CN203272221U CN 203272221 U CN203272221 U CN 203272221U CN 201320284923 CN201320284923 CN 201320284923 CN 201320284923 U CN201320284923 U CN 201320284923U CN 203272221 U CN203272221 U CN 203272221U
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Abstract
The utility model relates to a fluid dynamic pressure three-level mechanical sealing device of a reactor coolant pump. The structures and functions of mechanical seals are the same, and therefore the mechanical seals are convenient to replace mutually. Four restriction chokes are used in a combination mode, and therefore the three-level fluid series-connected dynamic pressure mechanical seals form six disabler modes, when a certain mechanical seal is damaged, a nuclear main pump can operate continuously in a short time, momentary power outage of a nuclear power plant is prevented, the maintenance of the nuclear power plant is enhanced, and the economic loss of the nuclear power plant is reduced.
Description
Technical field: the utility model relates to reactor coolant pump hydrodynamic three-stage mechanical seal device.
Background technique: reactor coolant pump hydrodynamic three-stage mechanical seal device is the important component part of core the most in the reactor coolant pump structure, and can direct relation core main pump safety in nuclear power station, reliable operation.If sealing is leaked, will directly cause the reactor shutdown, bring huge economic loss to nuclear power station, also can cause environmental radiation to pollute when serious.At present, the core main pump is unique equipment of not realizing production domesticization fully in China's nuclear island of nuclear power station.And the manufacturing market of core main pump is for a long time by the developed country such as American-European-Japanese monopolization, and by its technical advance, China is being in passivity aspect the design and manufacture of core main pump, and depends on import always.
Summary of the invention: the purpose of this utility model be disclose a kind of for reactor coolant pump hydrodynamic three-stage mechanical seal device.the technical solution of the utility model is: a kind of reactor coolant pump hydrodynamic three-stage mechanical seal device, be installed in series by three grades of identical mechanical seals, it is upper that static components (2-2) is installed to moving ring assembly (2-1), sealing surface both contacts and consists of mechanical seal (2), rotating ring (2-1) carries out axial rotation by straight pin with a sealing axle sleeve (1) and is connected, one extra ring (3) is installed to mechanical seal (2) outside and is compressed by a lead ring (4), the groove of No. two sealing axle sleeves (7) and a sealing axle sleeve (1) flange sleeve are fitted together and form interlocking matrix by two lobe clamp ring (6) lockings, identical mechanical seal (2) is installed on No. two sealing axle sleeves (7) by straight pin, two extra rings (9) dresses be pressed onto a lead ring (4) upper and by hex head screw (8) closing locking, the joint of first throttle device (10) and the second flow controller (11) is respectively installed in the bottom axial bore and upper axial hole of two extra rings (9), locked by hex head screw, on the different amount places radial hole of the jiont treatment of the 3rd flow controller (14) and the 4th flow controller (15) to the two extra rings (9), and locked by hex head screw, No. two lead rings (12) dress is pressed onto two extra rings (9) upward and forms interlocking matrix by socket head screw (13) locking, the groove of three grades of sealing axle sleeves (16) and secondary seal axle sleeve (7) flange suit compress, identical mechanical seal (2) is fixed in three grades of sealing axle sleeves (16) by straight pin, three extra rings (17) are installed No. two lead rings (12) upward and are compressed by No. three lead rings (18) and form third level Seal cage.
The beneficial effects of the utility model are:
(1) the utility model is pressed by three grades of identical mechanical seal series connection dresses and is formed, system pressure is by four flow controller step pressure reducings, final controlled low pressure " the zero leakage " (zero leakage that realizes sealing, refer to reactor coolant without external leakage), guarantee safety, the reliable operation of core main pump, and prevent environment nuclear radiation pollution.
(2) mechanical sealing friction pairs is comprised of rotating ring and stationary ring.Wherein, rotating ring rotates with sealing axle sleeve.The stationary ring end face is designed to special shallow slot bellows-shaped, produces liquid film during running between sealing friction pair, and is in steady state, avoids dry friction occurs and life-span of reducing mechanical seal.
(3) on structure, first order sealing and second level sealing have realized the integrated connection of two-stage sealing by two lobe clamp rings (6), be convenient to integral disassembly, assembly, greatly save disassembly and assembly time.
(4) cascaded structure of three-stage mechanical seal device and four flow controllers can form six kinds of disabler patterns, but when can guarantee main pump still safe operation within a certain period of time when certain mechanical seal damages, help reactor coolant pump dead halt and maintenance.
Reactor coolant pump hydrodynamic three-stage mechanical seal device is without leaking the principle explanation:
The sealing of three grades of fluid train interlock press mechanical pressings adopts three grades of identical hydrodynamic mechanical seals to share sealing load.From on fill the high-pressure injected water (pressure is higher than the reactor coolant pump cavity pressure) of pump (another equipment of nuclear power station), enter in first order Seal cage, then by respectively through two flow controller throttlings, enter respectively in second and third grade mechanical seal device chamber.The pressure that enters in first order mechanical seal chamber is 159bar, and the pressure that enters mechanical seal chamber, the second level is 106bar, and the pressure that enters third level mechanical seal device chamber is 53bar.The cooling water flow that enters every grade of mechanical seal is 600L/h.The every one-level that makes three grades of tandem mechanical seals is all equal operating mode.Every grade of mechanical seal controllable leak is 5L/h.Be designed to all can bear all system pressure 159bar every grade of starting stage three grades of hydrodynamic mechanical seal chipware, but when main pump normally moves every grade only bear 1/3 all system pressure, approximately 53bar.
The structural feature of reactor coolant pump hydrodynamic three-stage mechanical seal device is contactless, balance type, and state type, many springs, rotating ring end face are offered a plurality of large ripples, stationary ring internal diameter additional support steel loop.The front two-stage collection of three grades of tandem mechanical seals is fitted together, and the third level is an independent unit loading type, and the interface size of every one-level and the pump housing increases step by step, reduces step by step with the interface size of pump shaft, makes so easier for installation, quick.
Nuclear power station one circuit system pressure is 152bar.Under the main pump accidental conditions, system pressure is reduced to atmospheric pressure by three grades of tandem mechanical seals.
By nuclear power station RCV(chemistry and volume control) flow that provides of the centrifugal charging pump of system is 2000L/h, pressure is after the high-pressure shaft seal injected water of 159bar enters axle sealing system, higher than a circuit system pressure, so this injected water is divided into three flow directions due to the pressure of shaft sealing injected water.Flow direction enters in a circuit system to the water lubrication radial bearing with flow 800L/h, prevents that reactor coolant from entering in Seal cage.Another two flow directions enter second level mechanical seal and third level mechanical seal device with flow 600L/h respectively, and its pressure is respectively 106bar and 53bar.This minute to stream by first throttle device, the second flow controller, the 3rd flow controller and the 4th flow controller totally four flow controllers complete.When injected water was reduced to 106bar through first throttle device pressure, the pressure difference of first order mechanical seal front end and back end was 53bar, and this moment, the leakage rate of first order mechanical sealing surface was 5L/h, and it is mainly the lubricated and thermolysis of sealing surface.Before the leakage flow of this 5L/h flow to second level mechanical seal, pressure had been reduced to 106bar.Same principle, through identical mechanical seal, under the acting in conjunction of second and third grade mechanical seal and flow controller, pressure is that the pressure of 159bar high pressure sealing injected water also drops to 2～3bar, inject respectively nuclear power station cvcs (RCV), and flow into the low-pressure leak system from the sealing face leakage of third level mechanical seal 5L/h leakage rate out.
Succeeding in developing of three grades of hydrodynamic mechanical seals, to make the production domesticization work of China's core main pump stride forward major step, from then on break away from the difficult situation of restricted external import, fill up the blank historical of country's unrealized core main pump production domesticization all the time, replace imported, save foreign exchange, the also competition in the international market and carry out condition to third party's outlet and prepare for national nuclear power.
Description of drawings
Fig. 1 is reactor coolant pump hydrodynamic three-stage mechanical seal device sectional view
Fig. 2 is the mechanical seal structure cutaway view Amplified image
Fig. 3 is the first throttle device
Fig. 4 is the second flow controller
Fig. 5 is the 3rd flow controller
Fig. 6 is the 4th flow controller
Embodiment
as shown in Figure 1, reactor coolant pump hydrodynamic three-stage mechanical seal device is installed in series by three grades of identical mechanical seals, as shown in Figure 2, it is upper that static components 2-2 is installed to moving ring assembly 2-1, sealing surface both contacts and consists of mechanical seal 2, rotating ring 2-1 carries out axial rotation by straight pin with a sealing axle sleeve 1 and is connected, one extra ring 3 is installed to mechanical seal 2 outsides and is compressed by a lead ring 4, the groove of No. two sealing axle sleeves 7 and sealing axle sleeve 1 flange sleeve are fitted together and form interlocking matrix by two lobe clamp ring 6 lockings, identical mechanical seal 2 is installed on No. two sealing axle sleeves 7 by straight pin, two extra rings 9 dresses be pressed onto on lead ring 4 and by hex head screw 8 closing locking, as Fig. 3, shown in Figure 4, the joint of first throttle device 10 and the second flow controller 11 is respectively installed in the bottom axial bore and upper axial hole of two extra rings 9, locked by hex head screw, as Fig. 4, shown in Figure 5, on the different amount places radial hole of the jiont treatment of the 3rd flow controller 14 and the 4th flow controller 15 to the two extra rings 9, and locked by hex head screw, No. two lead ring 12 dresses are pressed onto on two extra rings 9 and by socket head screw 13 lockings and form interlocking matrix, the groove of three grades of sealing axle sleeves 16 and secondary seal axle sleeve 7 flange suits compress, identical mechanical seal 2 is fixed in three grades of sealing axle sleeves 16 by straight pin, compress on No. two lead rings 12 of three extra rings 17 installations and by No. three lead rings 18 and form third level Seal cage.
The utility model adopts three grades of identical mechanical seals 2 to be respectively installed on sealing axle sleeve 1, No. two sealing axle sleeves 7, three grades of sealing axle sleeves 16, and form six kinds of disabler patterns with first throttle device 10, the second flow controller 11, the 3rd flow controller 14 and the 4th flow controller 15, certain grade of mechanical seal damage guarantees the core main pump in the situation that still can move in a short time, race against time for the maintenance of core main pump, reduce the economic loss of nuclear power station.
Structure, the function of every grade of mechanical seal of the utility model are identical, can mutually replace, and are conducive to the maintenance of core main pump, and be applied widely.
Claims (1)
1. reactor coolant pump hydrodynamic three-stage mechanical seal device, it is characterized in that: be installed in series by three grades of identical mechanical seals, it is upper that static components (2-2) is installed to moving ring assembly (2-1), sealing surface both contacts and consists of mechanical seal (2), rotating ring (2-1) carries out axial rotation by straight pin with a sealing axle sleeve (1) and is connected, one extra ring (3) is installed to mechanical seal (2) outside and is compressed by a lead ring (4), the groove of No. two sealing axle sleeves (7) and a sealing axle sleeve (1) flange sleeve are fitted together and form interlocking matrix by two lobe clamp ring (6) lockings, identical mechanical seal (2) is installed on No. two sealing axle sleeves (7) by straight pin, two extra rings (9) dresses be pressed onto a lead ring (4) upper and by hex head screw (8) closing locking, the joint of first throttle device (10) and the second flow controller (11) is respectively installed in the bottom axial bore and upper axial hole of two extra rings (9), locked by hex head screw, on the different amount places radial hole of the jiont treatment of the 3rd flow controller (14) and the 4th flow controller (15) to the two extra rings (9), and locked by hex head screw, No. two lead rings (12) dress is pressed onto two extra rings (9) upward and forms interlocking matrix by socket head screw (13) locking, the groove of three grades of sealing axle sleeves (16) and secondary seal axle sleeve (7) flange suit compress, identical mechanical seal (2) is fixed in three grades of sealing axle sleeves (16) by straight pin, three extra rings (17) are installed No. two lead rings (12) upward and are compressed by No. three lead rings (18) and form third level Seal cage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320284923 CN203272221U (en) | 2013-05-22 | 2013-05-22 | Fluid dynamic pressure three-level mechanical sealing device of reactor coolant pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320284923 CN203272221U (en) | 2013-05-22 | 2013-05-22 | Fluid dynamic pressure three-level mechanical sealing device of reactor coolant pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203272221U true CN203272221U (en) | 2013-11-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320284923 Withdrawn - After Issue CN203272221U (en) | 2013-05-22 | 2013-05-22 | Fluid dynamic pressure three-level mechanical sealing device of reactor coolant pump |
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| CN (1) | CN203272221U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105041709A (en) * | 2015-06-12 | 2015-11-11 | 霍凤伟 | Fluid dynamic pressure type mechanical seal used for nuclear main pump and mechanical seal system of nuclear main pump |
| 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 |
| CN109434730A (en) * | 2018-12-12 | 2019-03-08 | 哈尔滨电气动力装备有限公司 | Reactor coolant pump seals room installation and removal positioning device |
-
2013
- 2013-05-22 CN CN 201320284923 patent/CN203272221U/en not_active Withdrawn - After Issue
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 |
| CN105041709A (en) * | 2015-06-12 | 2015-11-11 | 霍凤伟 | Fluid dynamic pressure type mechanical seal used for nuclear main pump and mechanical seal system of nuclear main pump |
| CN109434730A (en) * | 2018-12-12 | 2019-03-08 | 哈尔滨电气动力装备有限公司 | Reactor coolant pump seals room installation and removal positioning device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131106 Effective date of abandoning: 20150520 |
|
| RGAV | Abandon patent right to avoid regrant |