CN103206413B - A kind of mechanical seal for main feed pump - Google Patents
A kind of mechanical seal for main feed pump Download PDFInfo
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- CN103206413B CN103206413B CN201310125903.8A CN201310125903A CN103206413B CN 103206413 B CN103206413 B CN 103206413B CN 201310125903 A CN201310125903 A CN 201310125903A CN 103206413 B CN103206413 B CN 103206413B
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- cooling
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Abstract
The invention discloses a kind of mechanical seal for main feed pump in nuclear power equipment field, on the pump shaft of this mechanical seal socket main feed pump, comprise pump cover and the gland seal device being fixed on described pump cover radially inner side, a machine sealing chamber is provided with in described gland seal device, the front-end face of described pump cover is fixed with a cooling chamber be socketed with described pump shaft, in described cooling chamber, is full of the cooling water being in recurrent state; A refluxing chamber is formed between described cooling chamber and described machine sealing chamber; Described refluxing chamber is connected water intake and the water outlet of the first heat exchanger with described machine sealing chamber correspondence; Described machine sealing chamber is communicated with described refluxing chamber.Its technique effect is: to carry out gland seal device, before rinsing, having carried out twice cooling at the high-pressure liquid water of main feed pump conveying, fully reduces and is used for carrying out below the temperature to 80 DEG C of the high-pressure liquid water rinsed to gland seal device.
Description
Technical field
The present invention relates to a kind of mechanical seal for main feed pump in nuclear power equipment field.
Background technique
Main feed pump is non-core level pump, its major function of main feed pump in pressurized-water reactor nuclear power plant is: pressurize to the water of oxygen-eliminating device, then the water of oxygen-eliminating device enters high-pressure heater and steam generator, makes steam generator generating steam go to drive the main steam turbine generating of nuclear power station.And in the stage in period of primary Ioops reactor shutdown, the waste heat in heap also can make main feed pump give water generates steam, by the heat of primary Ioops medium derive, play cooling primary Ioops effect.Moreover be that main feed pump also can play the effect of being derived by unnecessary heat when accident conditionses such as the unexpected removal of load of main steam turbine or generation steam line breaks.Therefore, the operational reliability of main feed pump is very important.
Main feed pump is provided with mechanical seal.Because main feed pump runs in a high voltage state, the therefore high-pressure liquid water carried of main feed pump, nearly 180 DEG C of its temperature.In order to ensure the validity of mechanical seal, carry out in time rinsing to the shaft seal end face of gland seal device in mechanical seal, the temperature of high-pressure liquid water can not be greater than 80 DEG C, therefore how carrying out before rinsing to the shaft seal end face of gland seal device, the temperature fully reducing high-pressure liquid water is also a technological difficulties problem in main feed pump design.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of mechanical seal for main feed pump is provided, it can to carry out before rinsing at main feed pump to the gland seal device of mechanical seal, below the temperature to 80 DEG C fully reducing high-pressure liquid water, ensure the validity of mechanical seal.
A kind of technological scheme realizing above-mentioned purpose is: a kind of mechanical seal for main feed pump, on the pump shaft of this mechanical seal socket main feed pump, comprise pump cover and the gland seal device being fixed on described pump cover radially inner side, a machine sealing chamber is provided with in described gland seal device, the front-end face of described pump cover is fixed with a cooling chamber be socketed with described pump shaft, in described cooling chamber, is full of the cooling water being in recurrent state;
A refluxing chamber is provided with between described cooling chamber and described machine sealing chamber; Described refluxing chamber is connected water intake and the water outlet of the first heat exchanger with described machine sealing chamber correspondence;
Described machine sealing chamber is communicated with described refluxing chamber.
Further, the front-end face of described pump cover is fixed with cooling chamber gland, the radially inner side of described cooling chamber gland is provided with a coolant jacket, inner circumference and the described pump shaft of described coolant jacket are socketed, the excircle of described coolant jacket and the inner circumference of described cooling chamber gland and the inner circumference of described pump cover are fixed simultaneously, the inner circumference of described cooling chamber gland, described cooling chamber is formed between the excircle of described coolant jacket and the front-end face of described pump cover, described cooling chamber is connected with the second heat exchanger with the second water outlet through hole by the second inlet through hole being positioned at described pump cover top.
Further, the nockbush be socketed on described pump shaft is provided with between the inner circumference of described coolant jacket and the radial direction of described pump shaft.
Further, the excircle of described coolant jacket is provided with the choked flow groove of some annulars, and described choked flow groove is arranged in order along the axis of described coolant jacket.
Further, described refluxing chamber connects the water intake of the first heat exchanger by the first inlet through hole be positioned on described pump cover.
Further, described gland seal device comprises: rotating seat, rotating ring, stationary seat, stationary ring, machine sealed cover and sealed letter body;
Described rotating seat is fixed on described pump shaft, and described machine sealed cover is socketed at the rear portion of described rotating seat and described rotating seat, and described sealed letter body and described pump cover are fixed, and is socketed with the excircle of described rotating seat and the excircle of described machine sealed cover; Described rotating seat, described sealed letter body and described machine sealed cover surround described machine sealing chamber;
Radial clearance is left between described rotating seat and described sealed letter body; Described machine sealing chamber is communicated with by this radial clearance with described refluxing chamber;
The top of described sealed letter body is provided with cooling through hole, and described pump cover is provided with the first inlet through hole; Described cooling through hole connects described first inlet through hole, and described first inlet through hole connects the water outlet of described first heat exchanger.
Further, in described machine sealing chamber, described rotating ring is fixed on described rotating seat, described stationary ring is fixed on described stationary seat, described stationary seat is fixed on described machine sealed cover, and be axially connected with described machine sealed cover by some springs being in compressive state, make the front-end face forced contact of the ear end face of described rotating ring and described stationary ring.
Further, the ear end face of described machine sealed cover is provided with the baffle plate by described machine sealed cover and described sealed letter body axial restraint.
Have employed the technological scheme of a kind of mechanical seal for main feed pump of the present invention, namely before gland seal device, add cooling chamber and refluxing chamber, the high-pressure liquid water to gland seal device carries out from rinsing fully is cooled.Its technique effect is: the high-pressure liquid water that main feed pump transmits, before the shaft seal end face of gland seal device being carried out to flushing certainly, first by carrying out heat exchange with the cooling water in cooling chamber, pass through refluxing chamber again, be back in the first heat exchanger and cool, namely carried out twice cooling, fully reduced and be used for carrying out below the temperature to 80 DEG C of the high-pressure liquid water rinsed to gland seal device.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of mechanical seal for main feed pump of the present invention.
Fig. 2 is a kind of structural representation for gland seal device in the mechanical seal of main feed pump of the present invention.
Embodiment
Refer to Fig. 1 and Fig. 2, the present inventor, in order to understand technological scheme of the present invention better, below by embodiment particularly, and is described in detail by reference to the accompanying drawings:
Refer to Fig. 1 and Fig. 2, a kind of mechanical seal for main feed pump of the present invention, this mechanical seal is socketed on the pump shaft 10 of main feed pump, comprises pump cover 1, cooling chamber gland 2, coolant jacket 3 and gland seal device 4.In addition, this mechanical seal is the also external first heat exchanger (not shown) supporting with this mechanical seal and the second heat exchanger (not shown).
Cooling chamber gland 2 is bolted on the front-end face of pump cover 1, and coolant jacket 3 is positioned at the radially inner side of cooling chamber gland 2.The inner circumference of the excircle of coolant jacket 3 and the inner circumference of cooling chamber gland 2 and pump cover 1 is fixed simultaneously.The inner circumference of coolant jacket 3 is socketed on pump shaft 10.Leaving radial clearance between pump shaft 10 and coolant jacket 3 radial direction, being used in main feed pump flowing through from this radial clearance the high-pressure liquid water that gland seal device 4 carries out from rinsing.Therefore, the front-end face of pump cover 1, between the inner circumference of cooling chamber gland 2 and the excircle of coolant jacket 3, define a cooling chamber 100, in cooling chamber 100, be full of the cooling water being in recurrent state.
In the present embodiment, in order to coolant jacket 3 and cooling chamber gland 2 being fixed, ensure that the cooling water in cooling chamber 100 does not leak, the front-end face of coolant jacket 2 is provided with a coolant jacket nut 21.
In order to realize the circulation of the cooling water in cooling chamber 100, pump cover 1 is provided with the second inlet through hole (not shown) and the second water outlet through hole (not shown), cooling chamber 100 is communicated with external described second heat exchanger (not shown), and by the second described heat exchanger the cooling water in cooling chamber 100 is cooled and circulate.
In radial clearance between pump shaft 10 and coolant jacket 3 radial direction; pump shaft 10 is socketed with nockbush 5; to protect pump shaft 10; pump shaft 10 is made not cause thermal distortion because of the high temperature of high-pressure liquid water; in addition on the one hand, slow down the flow velocity in the radial clearance of high-pressure liquid water between pump shaft 10 and coolant jacket 3, make high-pressure liquid water have the cooling water in sufficient time and cooling chamber 100 to carry out heat exchange; make high-pressure liquid water before gland seal device 4 being carried out to flushing certainly, temperature fully reduces.Simultaneously, the excircle of coolant jacket 3 is arranged the choked flow groove 31 of some annulars, increase the heat exchange area of coolant jacket 3, the high-pressure liquid water in the radial clearance between pump shaft 10 and coolant jacket 3 and the cooling water in cooling chamber 100 is made to carry out sufficient heat exchange, to reduce the temperature of high-pressure liquid water when carrying out gland seal device 4 from flushing further.
Gland seal device 4 is between pump shaft 10 and pump cover 1 radial direction.Between gland seal device 4 and cooling chamber 100, be also provided with a refluxing chamber 200.The water intake of the first heat exchanger described in refluxing chamber 200 is connected by the first water outlet through hole (not shown) be positioned on pump cover 1.
Gland seal device 4 comprises rotating seat 41, rotating ring 42, stationary seat 43, stationary ring 44, machine sealed cover 45, sealed letter body 46 and baffle plate 47.
Rotating seat 41 is socketed on pump shaft 10, and fixes with pump shaft 10, and machine sealed cover 45 is socketed at the rear portion of rotating seat 41 and rotating seat 41, and sealed letter body 46 and pump cover 1 are fixed by screw, and are socketed with the excircle of rotating seat 41 and the excircle of machine sealed cover 45; Rotating seat 41, sealed letter body 46 and machine sealed cover 45 surround machine sealing chamber 40.
The top of sealed letter body 46 is provided with cooling through hole 461, pump cover 1 is provided with the first inlet through hole 11, cooling through hole 461 connects the water outlet that the first inlet through hole 11, first inlet through hole 11 connects the first described heat exchanger, and machine sealing chamber 40 is communicated with the water outlet of the first described heat exchanger.
Meanwhile, leave radial clearance between sealed letter body 46 and rotating seat 41 radial direction, refluxing chamber 200 is communicated with machine sealing chamber 40.
Rotating ring 42, stationary seat 43 and stationary ring 44 are all positioned at machine sealing chamber 40.In machine sealing chamber 40, the excircle of rotating ring 42 and front-end face and rotating seat 41 are fixed.The excircle of stationary ring 44 and ear end face and stationary seat 43 are fixed.The excircle of stationary seat 43 and the inner circumference of machine sealed cover 45 are fixed, simultaneously, the ear end face of stationary seat 43 is axially connected by some springs 48 being in compressive state with the front-end face of machine sealed cover 45, make axially loaded contact between the ear end face of rotating ring 42 and the front-end face of stationary ring 44, form the shaft seal end face of gland seal device 4.
Leak to prevent the high-pressure liquid water in machine sealing chamber 40.The ear end face of machine sealed cover 45 is provided with baffle plate 47, rotating seat 44 and sealed letter body 46 is fixed.
In order to ensure the sealing of gland seal device 4, between rotating seat 41 and pump shaft 10, between rotating seat 41 and rotating ring 42, between stationary ring 44 and stationary seat 43, between stationary seat 43 and machine sealed cover 45 and between machine sealed cover 45 and sealed letter body 46, be equipped with O-ring seals.
The high-pressure liquid water of overcurrent from the radial clearance between pump shaft 10 and coolant jacket 3 like this, after inflow refluxing chamber 200, first enter the first described heat exchanger by the first water outlet through hole on pump cover 1 to cool, again through the first inlet through hole 11 and cooling through hole 461, enter machine sealing chamber 40, carry out from rinsing to the shaft seal end face of gland seal device 4, the temperature of high-pressure liquid water when carrying out the shaft seal end face of gland seal device 4 from flushing can be reduced to less than 80 DEG C further.
Like this, before the shaft seal end face of gland seal device 4 being carried out to flushing certainly, the high-pressure liquid water that main feed pump is carried have passed through twice cooling process, thus ensure that when rinsing the shaft seal end face of gland seal device 4, the temperature of high-pressure liquid water, below 80 DEG C, ensure that the validity of gland seal device 4.After rinsing the shaft seal end face of gland seal device 4, high-pressure liquid water is back to refluxing chamber 200 from the radial clearance between sealed letter body 46 and rotating seat 41, then is back to the first described heat exchanger from refluxing chamber 200 and again cools.
Those of ordinary skill in the art will be appreciated that, above embodiment is only used to the present invention is described, and be not used as limitation of the invention, as long as in spirit of the present invention, all will drop in Claims scope of the present invention the change of the above embodiment, modification.
Claims (7)
1. the mechanical seal for main feed pump, on the pump shaft (10) of this mechanical seal socket main feed pump, comprise pump cover (1) and be fixed on the gland seal device (4) of described pump cover (1) radially inner side, be provided with a machine sealing chamber (40) in described gland seal device (4), it is characterized in that:
The front-end face of described pump cover (1) is fixed with a cooling chamber (100) be socketed with described pump shaft (10), described cooling chamber is full of the cooling water being in recurrent state in (100);
A refluxing chamber (200) is provided with between described cooling chamber (100) and described machine sealing chamber (40); Described refluxing chamber (200) is connected water intake and the water outlet of the first heat exchanger with described machine sealing chamber (40) correspondence;
Described machine sealing chamber (40) is communicated with described refluxing chamber (200),
Described gland seal device (4) comprising: rotating seat (41), rotating ring (42), stationary seat (43), stationary ring (44), machine sealed cover (45) and sealed letter body (46);
Described rotating seat (41) is fixed on described pump shaft (10), described machine sealed cover (45) is socketed at the rear portion of described rotating seat (41) and described rotating seat (41), described sealed letter body (46) is fixed with described pump cover (1), and is socketed with the excircle of described rotating seat (41) and the excircle of described machine sealed cover (45); Described rotating seat (41), described sealed letter body (46) and described machine sealed cover (45) surround described machine sealing chamber (40);
Radial clearance is left between described rotating seat (41) and described sealed letter body (46); Described machine sealing chamber (40) is communicated with by this radial clearance with described refluxing chamber (200);
The top of described sealed letter body (46) is provided with cooling through hole (461), and described pump cover (1) is provided with the first inlet through hole (11); Described cooling through hole (461) connects described first inlet through hole (11), and described first inlet through hole (11) connects the water outlet of described first heat exchanger.
2. a kind of mechanical seal for main feed pump according to claim 1, it is characterized in that: the front-end face of described pump cover (1) is fixed with cooling chamber gland (2), the radially inner side of described cooling chamber gland (2) is provided with a coolant jacket (3), inner circumference and the described pump shaft (10) of described coolant jacket (3) are socketed, the inner circumference of the excircle of described coolant jacket (3) and the inner circumference of described cooling chamber gland (2) and described pump cover (1) is fixed simultaneously, the inner circumference of described cooling chamber gland (2), described cooling chamber (100) is formed between the excircle of described coolant jacket (3) and the front-end face of described pump cover (1), described cooling chamber (100) is connected with the second heat exchanger with the second water outlet through hole by the second inlet through hole being positioned at described pump cover (1) top.
3. a kind of mechanical seal for main feed pump according to claim 2, is characterized in that: be provided with the nockbush (5) be socketed on described pump shaft (10) between the inner circumference of described coolant jacket (3) and the radial direction of described pump shaft (10).
4. a kind of mechanical seal for main feed pump according to claim 2, it is characterized in that: the excircle of described coolant jacket (3) is provided with the choked flow groove (31) of some annulars, and described choked flow groove (31) is arranged in order along the axis of described coolant jacket (3).
5. a kind of mechanical seal for main feed pump according to claim 1 and 2, is characterized in that: described refluxing chamber (200) connects the water intake of the first heat exchanger by the first inlet through hole be positioned on described pump cover (1).
6. a kind of mechanical seal for main feed pump according to claim 1, it is characterized in that: in described machine sealing chamber (40), described rotating ring (42) is fixed on described rotating seat (41), described stationary ring (44) is fixed on described stationary seat (43), described stationary seat (43) is fixed on described machine sealed cover (45), and be axially connected with described machine sealed cover (45) by some springs (48) being in compressive state, make the ear end face of described rotating ring (42) and the front-end face forced contact of described stationary ring (44).
7. a kind of mechanical seal for main feed pump according to claim 1, is characterized in that: the ear end face of described machine sealed cover (45) is provided with the baffle plate (47) by described machine sealed cover (45) and described sealed letter body (46) axial restraint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310125903.8A CN103206413B (en) | 2013-04-12 | 2013-04-12 | A kind of mechanical seal for main feed pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310125903.8A CN103206413B (en) | 2013-04-12 | 2013-04-12 | A kind of mechanical seal for main feed pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103206413A CN103206413A (en) | 2013-07-17 |
| CN103206413B true CN103206413B (en) | 2015-09-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310125903.8A Active CN103206413B (en) | 2013-04-12 | 2013-04-12 | A kind of mechanical seal for main feed pump |
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| CN (1) | CN103206413B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023052324A1 (en) * | 2021-09-28 | 2023-04-06 | Andritz Küsters Gmbh | Seal assembly and roller |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107355541A (en) * | 2017-07-28 | 2017-11-17 | 丹东克隆集团有限责任公司 | Nuclear power safety injection pump mechanically-sealing apparatus drag ring and the fit structure of its ring seat |
| CN108730525B (en) * | 2017-11-16 | 2024-04-09 | 江苏核电有限公司 | Nuclear reactor coolant pump mechanical seal unit dismounting method and device |
| CN111980932A (en) * | 2020-04-22 | 2020-11-24 | 王加华 | a fluid conveying machine |
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| US3888495A (en) * | 1972-06-09 | 1975-06-10 | Ehrhard Mayer | Dual-cooled slide ring seal |
| JP2002098237A (en) * | 2000-09-21 | 2002-04-05 | Eagle Ind Co Ltd | Shaft sealing device |
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| CN102865251A (en) * | 2012-09-10 | 2013-01-09 | 江苏大学 | Suspension body of hot water circulating pump provided with groove structure on inner wall surface |
| CN203257728U (en) * | 2013-04-12 | 2013-10-30 | 上海阿波罗机械股份有限公司 | Mechanical seal for main water-feeding pump |
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2013
- 2013-04-12 CN CN201310125903.8A patent/CN103206413B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3888495A (en) * | 1972-06-09 | 1975-06-10 | Ehrhard Mayer | Dual-cooled slide ring seal |
| JP2002098237A (en) * | 2000-09-21 | 2002-04-05 | Eagle Ind Co Ltd | Shaft sealing device |
| CN101031745A (en) * | 2004-08-26 | 2007-09-05 | 伊格尔工业股份有限公司 | Mechanical seal device |
| CN201013650Y (en) * | 2007-03-27 | 2008-01-30 | 胡滨 | Mechanical sealing member for hot oil pump axis |
| CN101566158A (en) * | 2009-04-07 | 2009-10-28 | 丹东克隆集团有限责任公司 | High performance mechanical canned motor pump |
| CN102112785A (en) * | 2009-09-24 | 2011-06-29 | 伊格尔工业股份有限公司 | Mechanical seal |
| CN102865251A (en) * | 2012-09-10 | 2013-01-09 | 江苏大学 | Suspension body of hot water circulating pump provided with groove structure on inner wall surface |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023052324A1 (en) * | 2021-09-28 | 2023-04-06 | Andritz Küsters Gmbh | Seal assembly and roller |
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| Publication number | Publication date |
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| CN103206413A (en) | 2013-07-17 |
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