CN203394839U - Shaft mechanical sealing device of main cooling medium pump of nuclear power plant - Google Patents
Shaft mechanical sealing device of main cooling medium pump of nuclear power plant Download PDFInfo
- Publication number
- CN203394839U CN203394839U CN201320441845.5U CN201320441845U CN203394839U CN 203394839 U CN203394839 U CN 203394839U CN 201320441845 U CN201320441845 U CN 201320441845U CN 203394839 U CN203394839 U CN 203394839U
- Authority
- CN
- China
- Prior art keywords
- impeller
- seal
- sealing
- face
- section
- 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
Links
Images
Abstract
The utility model discloses a shaft mechanical sealing device of a main cooling medium pump of a nuclear power plant. The sealing device comprises a sealing cavity. A sealing outer sleeve and a shaft sleeve are closed to form the sealing cavity, a spiral sealing section, an impeller sealing section and an end surface sealing section are axially sequentially arranged in the sealing cavity, the impeller sealing section is an impeller sealing assembly comprising an impeller seat sleeve and three stages of impellers, impeller partition plates are arranged among the adjacent impellers, the circumferences of the primary impeller, the secondary impeller and the tertiary impeller are stepped, a barrier is arranged at the front of the primary impeller, the end surface sealing section comprises a primary end surface seal and a secondary end surface seal, and each end surface seal comprises a movable sealing ring, a fixed sealing ring and a load spring, and each movable sealing ring is matched with the corresponding fixed sealing ring. The shaft mechanical sealing device has the advantages of simple structure, low manufacturing cost, good sealing effect and long service life.
Description
Technical field
The utility model relates to a kind of sealing device for rotary shaft, especially a kind of mechanical seal device for nuclear power station cooling agent main pump shaft.
Background technique
Nuclear power station cooling agent main pump of the prior art adopts the centrifugal shaft seal formula of vertical single stage centrifugal pump more, the mechanical seal for axle of this pump adopts three-stage mechanical seal structure more, be that one-level adopts the sealing of hydrostatic flat, the controlled leak mechanical seal that relies on liquid film to suspend, its critical piece consists of a pair of non-contacting rotating ring and stationary ring, two, three grades of sealings adopt the sealing of rubbing surface type, by a pair of rotating ring and the stationary ring that fit together by spring, formed, special working environment due to nuclear power station cooling agent main pump, require the shaft sealer of pump under the pressure difference of 15.5MP, under the rotating speed of 1480rpm, can keep good sealing effect, once sealing is revealed the serious consequence that causes huge loss and can not envision.Therefore very harsh to the requirement of shaft sealing, especially the primary seal end-face friction Re Genggao under high pressure, end face more easily produces thermal distortion, so, the end face of high-pressure mechanical seal must be considered rational form, be beneficial to heat conduction, reduce temperature rise, balanced action power, suppress face deformation, and end face produces shock and vibration, all can strengthen end face frictional heat and fatigue failure, cannot form stable liquid film simultaneously.In addition, loading coefficient is sealing important design parameter, the size of its value directly affects face pressure, affect the fit-state of section, under high pressure, its value is particularly important, as long as loading coefficient has small variations, will cause that face pressure changes a lot, and value that can be for reference is very limited, determining of its value must obtain by a large amount of tests.The cost of primary seal has reached 160,000 Euros especially, has increased the operating cost in power station.
Model utility content
The technical problem that model utility will solve is: a kind of nuclear power station cooling agent main pump shaft mechanical seal device is provided, and this apparatus structure is simple, cost is low, good sealing effect, long service life.
The technological scheme that technical solution problem is taked: a kind of nuclear power station cooling agent main pump shaft mechanical seal device, comprise the Seal cage being sealed with axle sleeve by hermetically sealed case, in Seal cage, set gradually vertically spiral seal section, impeller seals section and end face seal section, described impeller seals section is by impeller cover for seat and three grades of impeller seals assemblies that impeller forms, between adjacent impeller, be provided with impeller dividing plate, one-level impeller, sencond stage impeller, the excircle of three grades of impellers is stepped, before one-level impeller, be provided with baffle plate, described end face seal section consists of one-level end face seal and secondary end face seal, every grade of end face seal is by the rotary packing ring cooperatively interacting, stationary seal ring and loading spring form.
As improvement of the present utility model: described spiral seal section is Double layer multiple spiral chute axle sleeve, and internal layer multi-head spiral groove extends to the abrasive end face of the rotary packing ring of one-level end face seal, outer multi-head spiral groove extends to card after third level impeller.
As further improvement of the utility model: the rotary packing ring of one-level end face seal is arranged on the hub disk of impeller seals third level impeller.
As of the present utility model, further improve again: on the abrasive end face of the rotary packing ring of one-level end face seal, be provided with fluid dynamic pressure groove.
As another kind of improvement of the present utility model: be provided with two triangular groove shapes of stationary seal ring and hermetically sealed case inner wall sealing are sealed on the outer peripheral surface of the stationary seal ring of end face seal section.
As this optimum scheme: be provided with lubricious cooling water intake on corresponding stuffing box gland between the stationary seal ring abrasive end face of secondary end face seal and two triangular groove shapes sealings, seal at two triangular groove shapes on the stuffing box gland of opposite sides and be provided with flow-off.
Beneficial effect: nuclear power station cooling agent main pump shaft mechanical seal device of the present utility model, owing to having adopted described nuclear power station cooling agent main pump shaft mechanical seal device to comprise the Seal cage being sealed with axle sleeve by hermetically sealed case, in Seal cage, set gradually vertically spiral seal section, impeller seals section and end face seal section, described impeller seals section is by impeller cover for seat and three grades of impeller seals assemblies that impeller forms, between adjacent impeller, be provided with impeller dividing plate, one-level impeller, sencond stage impeller, the excircle of three grades of impellers is stepped, before one-level impeller, be provided with baffle plate, described end face seal section consists of one-level end face seal and secondary end face seal, the sealing of Mei Ji mechanism is by the rotary packing ring cooperatively interacting, the technological scheme that stationary seal ring and loading spring form, by spiral seal section and impeller seals section are set before end face seal section, substitute hydrostatic equilibrium formula sealing of the prior art, the leakage rate that enters into end face seal section is gone to zero, reduced the burden of end face seal section, and spiral seal section and impeller seals section are easier to manufacturing, the stationary ring of one-level end face seal is the sealing water pressure of leaning on its deadweight and playing lubrication effect, the stationary ring of secondary end face seal is by its deadweight and spring force, realization coordinates.In addition, no matter spiral seal section and impeller seals section are moved under any operating mode, nearly all without wearing and tearing, seal face also bears pressure and the interference of sealed medium hardly thus, this sealing there will not be the leakage that sealed medium occurs because of end wear, this seals Once you begin seepage, though under High Pressure, reach leakage rate increasing be also need to be very very long a period of time.First sealed medium is when dynamic and static gaps process leading portion spiral excircle, it is first deceleration, decompression, reduce flow, then the sealed medium one-level impeller baffle plate place that flows through, with static and dynamic sealing gap, be folded to, through sealed medium herein, a part enters between impeller leading portion blade and blade, becoming turbulent condition is depressurized, a part continues to leak after shaft seal with dynamic and static gaps, excircle through one-level impeller, and some is sucked and pumps into outer spiral chute by back segment impeller, the ingress to sealed medium by spiral chute pump again, remaining sealed medium continues to leak backward along sound parts clearance, because impeller outer circumference is stepped, arrange, so first some sealed medium enters between each impeller clearance again, and be pumped to spiral chute.Remainder continues to leak along the cylindrical circumferential seal rear end of sound parts, this part leakage is sucked by impeller again, and be pumped in the spiral chute of impeller root, by spiral chute, constantly medium pump is delivered to the ingress of sealing again, sealed medium constantly leaks to sealing rear end, and constantly by impeller, spiral chute pumping is gone back, that sealed medium leaks until three grades of impeller tip will be all pumped in spiral chute, therefore, nuclear power station cooling agent main pump shaft mechanical seal device of the present utility model, have simple in structure, cost is low, good sealing effect, the advantages such as long service life, it is a kind of ideal product that substitutes existing inlet sealing device, owing to having adopted described spiral seal section, it is Double layer multiple spiral chute axle sleeve, internal layer multi-head spiral groove extends to the abrasive end face place of the rotary packing ring of one-level end face seal, once primary seal end face, there is leakage, in I and II Seal cage, fluid pressure will raise, when being elevated to a definite value, the dynamic and static ring of secondary seal will will be opened internal layer spiral fluted entrance like this by jack-up, so leak into the medium of I and II Seal cage, will be walked by spiral chute pump.Outer multi-head spiral groove extends to the technical characteristics of card after third level impeller, has improved the sealing effect of spiral seal section, is stoping the leakage liquid of impeller seals section being collected when leaking to discharge in time Seal cage; Owing to having adopted the rotary packing ring of one-level end face seal to be arranged on the technical characteristics on the hub disk of impeller seals section third level impeller, optimized the structure of seal arrangement, make sealing device structure of the present utility model compacter; Owing to having adopted the technical characteristics that is provided with fluid dynamic pressure groove on the abrasive end face of the rotary packing ring of one-level end face seal, during work, at abrasive end face, form liquid film, reduce the rotary packing ring of one-level end face seal and the wearing and tearing between stationary seal ring, extended the working life of seal ring; Owing to having adopted the technical characteristics being provided with two triangular groove shapes sealings of stationary seal ring and hermetically sealed case inner wall sealing on the outer peripheral surface of the stationary seal ring of end face seal section, effectively prevented that leakage liquid is along the axial leakage between stationary seal ring and hermetically sealed case gap; Owing to having adopted on stuffing box gland corresponding between the stationary seal ring abrasive end face of secondary end face seal seals with two triangular groove shapes, be provided with lubricious cooling water intake, on the stuffing box gland of two triangular groove shape sealing opposite sides, be provided with the technical characteristics of flow-off, abrasive end face is carried out lubriciously in the situation that not having leakage liquid to arrive secondary end face seal section, reduced the stationary ring of secondary end face seal section and operating temperature and the surface friction drag of rotating ring.Opening, during termination of pumping, sealing shields in I and II end face seal; during normal operation; only have when outer helical layer or damage in impeller to a certain extent after; sealed medium can not be sealed when injected water is whole to be beaten away, at this moment I and II end face seal just starts to play the seal action that stops leakage.Between one secondary end face seal, establish first class pressure and secondary pressure alarming value, establish three stage pressure alarming values during overflowing water port water breakthrough, alarming value namely stops.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Fig. 1 is the axial section structural representation of nuclear power station cooling agent main pump shaft mechanical seal device of the present utility model;
Fig. 2 is that the A-A of impeller in nuclear power station cooling agent main pump shaft mechanical seal device of the present utility model is to sectional drawing.
Embodiment
As shown in Figure 1, nuclear power station cooling agent main pump shaft mechanical seal device of the present utility model, comprise the Seal cage being sealed with axle sleeve 1 by hermetically sealed case 18, in Seal cage, set gradually vertically spiral seal section, impeller seals section and end face seal section, described impeller seals section is by impeller cover for seat 124 and three grades of impeller seals assemblies that impeller 12 forms, between adjacent impeller, be provided with impeller dividing plate 13, one-level impeller 121, sencond stage impeller 122, the excircle of three grades of impellers 123 is stepped, before one-level impeller, be provided with baffle plate 14, described end face seal section consists of one-level end face seal and secondary end face seal, one-level end face seal is by the rotary packing ring 11 cooperatively interacting, stationary seal ring 9 and loading spring 8 form, secondary end face seal is by the rotary packing ring 7 cooperatively interacting, stationary seal ring 6 and loading spring 2 form.Described spiral seal section is Double layer multiple spiral chute axle sleeve 15, internal layer multi-head spiral groove 17 extends to the abrasive end face of the rotary packing ring of one-level end face seal, outer multi-head spiral groove 16 extends to card after third level impeller, the rotary packing ring of one-level end face seal is arranged on the hub disk of impeller seals section third level impeller, on the abrasive end face of the rotary packing ring of one-level end face seal, is provided with fluid dynamic pressure groove 10.On the outer peripheral surface of the stationary seal ring of end face seal section, be provided with two triangular groove shapes sealings 3 of stationary seal ring and hermetically sealed case inner wall sealing, between the stationary seal ring abrasive end face of secondary end face seal and two triangular groove shapes sealings, on corresponding stuffing box gland, be provided with lubricious cooling water intake 5, at two triangular groove shapes, seal on the stuffing box gland of opposite sides and be provided with flow-off 4.
As shown in Figure 2, the blade of impeller seals section is wide-angle forward-curved blade 19.
Claims (6)
1. a nuclear power station cooling agent main pump shaft mechanical seal device, comprise the Seal cage being sealed with axle sleeve by hermetically sealed case, it is characterized in that: in Seal cage, set gradually vertically spiral seal section, impeller seals section and end face seal section, described impeller seals section is by impeller cover for seat and three grades of impeller seals assemblies that impeller forms, between adjacent impeller, be provided with impeller dividing plate, one-level impeller, sencond stage impeller, the excircle of three grades of impellers is stepped, before one-level impeller, be provided with baffle plate, described end face seal section consists of one-level end face seal and secondary end face seal, every grade of end face seal is by the rotary packing ring cooperatively interacting, stationary seal ring and loading spring form.
2. nuclear power station cooling agent main pump shaft mechanical seal device according to claim 1, it is characterized in that: described spiral seal section is Double layer multiple spiral chute axle sleeve, internal layer multi-head spiral groove extends to the abrasive end face of the rotary packing ring of one-level end face seal, and outer multi-head spiral groove extends to card after third level impeller.
3. nuclear power station cooling agent main pump shaft mechanical seal device according to claim 2, is characterized in that: the rotary packing ring of one-level end face seal is arranged on the hub disk of impeller seals third level impeller.
4. nuclear power station cooling agent main pump shaft mechanical seal device according to claim 3, is characterized in that: on the abrasive end face of the rotary packing ring of one-level end face seal, be provided with fluid dynamic pressure groove.
5. according to the nuclear power station cooling agent main pump shaft mechanical seal device described in claim 1 to 4 any one, it is characterized in that: on the outer peripheral surface of the stationary seal ring of end face seal section, be provided with two triangular groove shapes sealings of stationary seal ring and hermetically sealed case inner wall sealing.
6. nuclear power station cooling agent main pump shaft mechanical seal device according to claim 5, it is characterized in that: between the stationary seal ring abrasive end face of secondary end face seal and two triangular groove shapes sealings, on corresponding stuffing box gland, be provided with lubricious cooling water intake, at two triangular groove shapes, seal on the stuffing box gland of opposite sides and be provided with flow-off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320441845.5U CN203394839U (en) | 2013-07-24 | 2013-07-24 | Shaft mechanical sealing device of main cooling medium pump of nuclear power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320441845.5U CN203394839U (en) | 2013-07-24 | 2013-07-24 | Shaft mechanical sealing device of main cooling medium pump of nuclear power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203394839U true CN203394839U (en) | 2014-01-15 |
Family
ID=49906374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320441845.5U Expired - Fee Related CN203394839U (en) | 2013-07-24 | 2013-07-24 | Shaft mechanical sealing device of main cooling medium pump of nuclear power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203394839U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105090079A (en) * | 2014-05-14 | 2015-11-25 | 江苏核电有限公司 | Large-sized mechanical seal assembly training and online detection platform |
| CN105673552A (en) * | 2016-01-25 | 2016-06-15 | 李廷伟 | Shutdown sealing device for nuclear power main pump |
-
2013
- 2013-07-24 CN CN201320441845.5U patent/CN203394839U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105090079A (en) * | 2014-05-14 | 2015-11-25 | 江苏核电有限公司 | Large-sized mechanical seal assembly training and online detection platform |
| CN105090079B (en) * | 2014-05-14 | 2018-11-02 | 江苏核电有限公司 | Big machinery sealing assembly training and on-line checking platform |
| CN105673552A (en) * | 2016-01-25 | 2016-06-15 | 李廷伟 | Shutdown sealing device for nuclear power main pump |
| CN105673552B (en) * | 2016-01-25 | 2017-12-22 | 李晓燕 | A kind of nuclear power main pump parking sealing arrangement |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203532314U (en) | Labyrinth impeller ring clearance structure | |
| CN105298863B (en) | A kind of magnetic drive pump of resistance to dry grinding | |
| CN203394839U (en) | Shaft mechanical sealing device of main cooling medium pump of nuclear power plant | |
| CN207961525U (en) | One kind can compensate for from flushing type water injecting pump sealing structure of shaft end | |
| CN103047171B (en) | The global function throttling arrangement that floats | |
| CN204572482U (en) | Moveable centrifugal pump | |
| CN201818538U (en) | Hydraulic slide-valve type stop sealing mechanism for dynamic sealing of auxiliary impeller in centrifugal pump | |
| CN201599202U (en) | High temperature and high pressure process pump | |
| CN206889676U (en) | A kind of semi-contact graphite seal device | |
| CN102242714A (en) | Compound seal device of claw type dry vacuum pump | |
| CN206092446U (en) | Double containment hot water centrifugal pump | |
| CN205977788U (en) | Novel sealed choma subassembly | |
| CN213540823U (en) | Sealing device of turbine shaft | |
| CN204458250U (en) | Fully closed horizontal No leakage body | |
| WO2020037643A1 (en) | Novel impeller centrifugal water pump | |
| CN202851437U (en) | Friction seal device for pump | |
| CN209458134U (en) | A kind of novel standard-sized sheet Characteristics of Centrifugal Pulp Pump | |
| CN203560137U (en) | Two-stage centrifugal pump | |
| CN201705662U (en) | New type double-screw oil gas mixing transmission pump | |
| CN202284643U (en) | Nesting-type integrated type mechanical sealing structure | |
| CN105065679A (en) | Oil seal structure for supercharger | |
| CN104481889B (en) | One i.e. drives energy-saving vertical self priming pump | |
| CN201144858Y (en) | Novel seal ring for centrifugal pump | |
| CN203348149U (en) | Automatic adjusting water-free sealing device | |
| CN206129685U (en) | Oiling formula fan shaft seal device |
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 |
Granted publication date: 20140115 Termination date: 20140724 |
|
| EXPY | Termination of patent right or utility model |