CN102606518A - Mechanical seal device of plant water pump for nuclear power plant - Google Patents
Mechanical seal device of plant water pump for nuclear power plant Download PDFInfo
- Publication number
- CN102606518A CN102606518A CN2012100834409A CN201210083440A CN102606518A CN 102606518 A CN102606518 A CN 102606518A CN 2012100834409 A CN2012100834409 A CN 2012100834409A CN 201210083440 A CN201210083440 A CN 201210083440A CN 102606518 A CN102606518 A CN 102606518A
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- machine
- axle sleeve
- ring
- mechanical seal
- retainer
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Abstract
The invention discloses a mechanical seal device of a plant water pump for a nuclear power plant. The mechanical seal device comprises a mechanical seal shaft sleeve, a mechanical seal cavity, a mechanical seal gland, an assembling plate, a transmission seat, a rotating ring, a static ring and a plurality of springs. An outer flange ring is arranged at the lower part of the mechanical seal shaft sleeve; a plurality of spring holes are evenly distributed at the upper end face of the outer flange ring; an inner flange ring is arranged at the upper part of an inner cavity surface of the mechanical seal cavity; an inner circle surface of the inner flange ring is a one-step-ladder-shaped surface with a large upper part and a small lower part; the lower part of the inner circle surface of the mechanical seal gland is configured into a ladder-shaped surface; the ladder-shaped surface forms a ring installing slot together with the ladder-shaped surface on the mechanical seal cavity; the mechanical seal gland and the mechanical seal cavity are axially fixed on the pump body by the assembling plate; the static ring is embedded in the ring installing slot; a raised plate is arranged in the middle of the transmission seat; the transmission seat capable of axially moving is installed on the mechanical seal shaft sleeve; the rotating ring is fixed in an inner cavity at the upper part of the raise plate of the transmission seat; and the plurality of springs are arranged in the spring holes of the mechanical seal shaft sleeve, so that the upper end face of the rotating ring can be slidably jointed with the lower end face of the static ring.
Description
Technical field
The present invention relates to a kind of house service pump that is used for nuclear power station, be specifically related to a kind of machine envelope flushing line that is used for the house service pump of nuclear power station.
Background technique
The working medium that is used for the house service pump of nuclear power station is to contain sea of sand water.The major function of essential service water pump in nuclear power station is that the liquid heat that the component cooling water system transmission comes finally is transferred to seawater, and extracting seawater is cooled off component cooling water in other words.It is as the ultimate heat sink of nuclear island, and its significance is self-evident.
Adopt packing seal as the machine front cover of former vertical long shaft pump, though packing seal maintenance and replacing are convenient, its sealability does not have mechanical seal good, therefore can not satisfy the usage requirement of house service pump.
Summary of the invention
The objective of the invention is in order to overcome the deficiency of existing technology, a kind of machine seal apparatus that is used for the house service pump of nuclear power station is provided, it can prevent reliably that medium from leaking, good sealing effect and easy accessibility, long service life.
The technological scheme that realizes above-mentioned purpose is: a kind of machine seal apparatus that is used for the house service pump of nuclear power station, comprise machine envelope axle sleeve, machine sealing chamber body, machine sealed cover, assembled plate, retainer, rotating ring, stationary ring and some springs, wherein,
The bottom of the outer circumferential face of said machine envelope axle sleeve is provided with an outer bulge loop, and the upper-end surface of this outer bulge loop is provided with some spring eyes with being uniformly distributed along the circumference, and this machine envelope axle sleeve is enclosed within on the pump shaft of said house service pump regularly;
The top of the inner cavity surface of said machine sealing chamber body is provided with internal projecting ring, and the inner headed face of this internal projecting ring is up big and down small one-level ladder surface, and said machine sealing chamber body is installed on the pump housing of said house service pump;
The bottom of the inner headed face of said machine sealed cover is provided with an outside ladder surface, and the ladder surface on this ladder surface and the said machine sealing chamber body is common to be constituted one annular groove is installed, and this machine sealed cover is connected the upper end of said machine sealing chamber body;
Said assembled plate is connected to the top of said machine envelope axle sleeve, so that said machine sealed cover and machine sealing chamber axon are to being fixed on the said pump housing;
Said stationary ring is inlaid in the installation annular groove of said machine sealed cover and machine sealing chamber body formation;
The centre of the inner cavity surface of said retainer is provided with a protruding dish; And the external diameter of the outer bulge loop on the interior circular diameter of this protruding dish bottom and the said machine envelope axle sleeve is adaptive; The interior circular diameter on this protruding dish top and the external diameter of said rotating ring are adaptive, and this retainer is positioned at the outer bulge loop of said machine envelope axle sleeve with protruding dish the mode of top can be installed on the said machine envelope axle sleeve with moving axially;
Said rotating ring is fixed in the inner chamber on protruding dish top of said retainer;
Said some springs are placed in the spring eye of said machine envelope axle sleeve one by one, and the upper end of these some springs is connected the lower end surface of the protruding dish of said retainer, so that fit slidably in the lower end surface of the upper-end surface of said rotating ring and said stationary ring.
The machine seal apparatus of the above-mentioned house service pump that is used for nuclear power station wherein, is offered the outlet of a sparge water import and a sparge water on the wall of said machine sealing chamber body, the outlet of this sparge water import and a sparge water is sealed flushing line with machine on being located at the said pump housing and is connected.
The machine seal apparatus of the above-mentioned house service pump that is used for nuclear power station wherein, is offered the outlet of a Lubricants import and a Lubricants on the wall of said machine sealed cover, this Lubricants import is connected with the liquid-soaked jar that is located at said machine seal apparatus behind with the Lubricants outlet.
The machine seal apparatus of the above-mentioned house service pump that is used for nuclear power station wherein, is also filled special-purpose silicone grease in the spring eye of said machine envelope axle sleeve.
The machine seal apparatus of the above-mentioned house service pump that is used for nuclear power station, wherein, said machine envelope axle sleeve is fixed on the said pump shaft through clamping ring.
The machine seal apparatus of the above-mentioned house service pump that is used for nuclear power station; Wherein, The upper-end surface of the outer bulge loop of said machine envelope axle sleeve also is provided with some positioning pin holes in uniform way along circumference; The end face of the intermediate section of said retainer is provided with the some and said corresponding perforation of stating on the machine envelope axle sleeve of positioning pin hole, so that said retainer is installed on the said machine envelope axle sleeve through some locating studs.
The machine seal apparatus of the above-mentioned house service pump that is used for nuclear power station, wherein, said rotating ring is fixed on the said retainer through pin.
The machine seal apparatus of the above-mentioned house service pump that is used for nuclear power station; Wherein, reach between the said retainer between said machine envelope axle sleeve and the said pump shaft, between said retainer and the said rotating ring, be respectively equipped with seal ring between said stationary ring and said machine sealed cover and the said machine sealing chamber body.
The technological scheme of the machine seal apparatus of the house service pump that is used for nuclear power station of the present invention adopts unit loading type machine seal apparatus, the convenient installation and maintenance.It relies on the pressure of sealing medium on the surface of contact of rotating ring that rotates and stationary ring, to produce suitable impacting force; The surface of contact appropriateness of rotating ring and stationary ring is fitted; Make keep all the time between the surface of contact of rotating ring and stationary ring one deck as thin as a wafer liquid film and reach the purpose of sealing; Therefore can prevent reliably that medium from leaking, good sealing effect.
Description of drawings
Fig. 1 is the structural representation of the machine seal apparatus of the house service pump that is used for nuclear power station of the present invention.
Embodiment
In order to understand technological scheme of the present invention better, below through embodiment particularly and combine accompanying drawing at length to explain:
See also Fig. 1, a kind of machine seal apparatus that is used for the house service pump of nuclear power station of the present invention comprises machine envelope axle sleeve 1, machine sealing chamber body 2, machine sealed cover 3, assembled plate 4, stationary ring 5, retainer 6, rotating ring 7 and some springs 8, wherein:
Machine envelope axle sleeve 1 is enclosed within on the pump shaft 10 through clamping ring 11 regularly, and the top of the outer circumferential face of this machine envelope axle sleeve 1 is provided with a scrobicular ring, and the bottom is provided with an outer bulge loop 12, and the upper-end surface of this outer bulge loop 12 is provided with some spring eyes and some positioning pin holes with being uniformly distributed along the circumference; Be provided with O-ring seals 13 between the inner headed face of this machine envelope axle sleeve 1 and the pump shaft;
Machine sealing chamber body 2 is installed on the pump housing of house service pump, and the top of the inner cavity surface of this machine sealing chamber body 2 is provided with internal projecting ring, and the inner headed face of this internal projecting ring is up big and down small one-level ladder surface; Offer a sparge water import 21 and sparge water outlet 22 on the wall of machine sealing chamber body 2, this sparge water import 21 and sparge water outlet 22 is sealed flushing line with machine on being located at the pump housing and is connected;
Machine sealed cover 3 is connected the upper end of machine sealing chamber body 2, and the bottom of the inner headed face of this machine sealed cover 3 is provided with an outside ladder surface, and the ladder surface on this ladder surface and the machine sealing chamber body 2 is common to be constituted one annular groove is installed;
Assembled plate 4 is connected in the top scrobicular ring of machine envelope axle sleeve 1, and through screw 40 machine sealed cover 3 and machine sealing chamber body 2 is axially fixed on the pump housing 20;
The centre of the inner cavity surface of retainer 6 is provided with a protruding dish 60; And the external diameter of the outer bulge loop 12 of the interior circular diameter of these protruding dish 60 bottoms and machine envelope axle sleeve 1 is adaptive; The interior circular diameter on these protruding dish 60 tops and the external diameter of rotating ring 7 are adaptive; Offer the corresponding perforation of positioning pin hole on some and the machine envelope axle sleeve 1 on the surface of the protruding dish 60 of this retainer 6, this retainer 6 be positioned at protruding dish 60 machine envelope axle sleeve 1 outer bulge loop 12 the top mode and can be installed in machine through some locating studs 61 with moving axially and seal on the axle sleeve 1; Be provided with O-ring seals 14 between the outer circumferential face of the outer bulge loop 12 of the inner headed face of protruding dish 60 bottoms of this retainer 6 and machine envelope axle sleeve 1;
Rotating ring 7 is located at through O-ring seals 70 in the inner chamber on protruding dish 60 tops of retainer 6 and through two pins 62 and is fixed on the protruding dish 60 of retainer 6;
Some springs 8 are placed in the spring eye of machine envelope axle sleeve 1 one by one; Can squint by restraining spring 8; The front end of these some springs 7 is connected the lower end surface of the protruding dish 60 of retainer 6, so that fit slidably and form sealed friction surface in the lower end surface of the upper-end surface of rotating ring 7 and stationary ring 5.
The working principle of machine seal apparatus of the present invention is: in the pump operation process; In the machine sealing chamber that constitutes by the pump housing 20, machine sealing chamber body 2 and machine sealed cover 3, can form to be full of and have the certain pressure fed sheet of a media; Because the both ends of the surface area that rotating ring 7 is stressed does not wait; Can form impacting force to stationary ring 5; And stationary ring 5 fits the sealed friction surface appropriateness that forms between rotating ring 7 and the stationary ring 5 through spring 8, keeps the purpose that one deck liquid film as thin as a wafer reaches sealing between the sealing rubbing surface thereby so make.
Because pump no medium lubrication and seal rubbing surface in seven times in second of initial start stage; For preventing that the sealed friction surface dry friction from damaging; The back of employing machine seal apparatus is provided with a liquid-soaked jar; And on the wall of machine sealed cover 3, offer a Lubricants import 31 and Lubricants outlet 32, this Lubricants import 31 and Lubricants outlet 32 are connected with the liquid-soaked jar, are used for lubricating of the preceding sealed friction surface of pump startup.
Touch the liquid position, promptly stationary ring 5, retainer 6, rotating ring 7 all adopt dual phase steel S31803, and spring 7 adopts Hastelloy Hast.C4, but the washing away of the corrosion of sea water resistance and silt.
The surface of contact of stationary ring 5 and rotating ring 7 all is covered with one deck silicon carbide, to be applicable to the medium that contains silt.
In addition, in order to prevent sedimentation in the micro-leakage liquid in spring eye, the spring blocking hole was lost efficacy spring 8, in spring eye, filled special-purpose silicone grease 80, to guarantee spring 8 normal long-term uses.
Those of ordinary skill in the art will be appreciated that; Above embodiment is used for explaining the present invention; And be not with opposing qualification of the present invention; As long as in connotation scope of the present invention, all will drop in claims scope of the present invention the above embodiment's variation, modification.
Claims (8)
1. a machine seal apparatus that is used for the house service pump of nuclear power station comprises machine envelope axle sleeve, machine sealing chamber body, machine sealed cover, assembled plate, retainer, rotating ring, stationary ring and some springs, it is characterized in that,
The bottom of the outer circumferential face of said machine envelope axle sleeve is provided with an outer bulge loop, and the upper-end surface of this outer bulge loop is provided with some spring eyes with being uniformly distributed along the circumference, and this machine envelope axle sleeve is enclosed within on the pump shaft of said house service pump regularly;
The top of the inner cavity surface of said machine sealing chamber body is provided with internal projecting ring, and the inner headed face of this internal projecting ring is up big and down small one-level ladder surface, and said machine sealing chamber body is installed on the pump housing of said house service pump;
The bottom of the inner headed face of said machine sealed cover is provided with an outside ladder surface, and the ladder surface on this ladder surface and the said machine sealing chamber body is common to be constituted one annular groove is installed, and this machine sealed cover is connected the upper end of said machine sealing chamber body;
Said assembled plate is connected to the top of said machine envelope axle sleeve, so that said machine sealed cover and machine sealing chamber axon are to being fixed on the said pump housing;
Said stationary ring is inlaid in the installation annular groove of said machine sealed cover and machine sealing chamber body formation;
The centre of the inner cavity surface of said retainer is provided with a protruding dish; And the external diameter of the outer bulge loop on the interior circular diameter of this protruding dish bottom and the said machine envelope axle sleeve is adaptive; The interior circular diameter on this protruding dish top and the external diameter of said rotating ring are adaptive, and this retainer is positioned at the outer bulge loop of said machine envelope axle sleeve with protruding dish the mode of top can be installed on the said machine envelope axle sleeve with moving axially;
Said rotating ring is fixed in the inner chamber on protruding dish top of said retainer;
Said some springs are placed in the spring eye of said machine envelope axle sleeve one by one, and the upper end of these some springs is connected the lower end surface of the protruding dish of said retainer, so that fit slidably in the lower end surface of the upper-end surface of said rotating ring and said stationary ring.
2. the machine seal apparatus that is used for the house service pump of nuclear power station according to claim 1; It is characterized in that; Offer the outlet of a sparge water import and a sparge water on the wall of said machine sealing chamber body, the outlet of this sparge water import and a sparge water is sealed flushing line with machine on being located at the said pump housing and is connected.
3. the machine seal apparatus that is used for the house service pump of nuclear power station according to claim 1; It is characterized in that; Offer the outlet of a Lubricants import and a Lubricants on the wall of said machine sealed cover, this Lubricants import is connected with the liquid-soaked jar that is located at said machine seal apparatus behind with the Lubricants outlet.
4. the machine seal apparatus that is used for the house service pump of nuclear power station according to claim 1 is characterized in that, also fills special-purpose silicone grease in the spring eye of said machine envelope axle sleeve.
5. the machine seal apparatus that is used for the house service pump of nuclear power station according to claim 1 is characterized in that, said machine envelope axle sleeve is fixed on the said pump shaft through clamping ring.
6. the machine seal apparatus that is used for the house service pump of nuclear power station according to claim 1; It is characterized in that; The upper-end surface of the outer bulge loop of said machine envelope axle sleeve also is provided with some positioning pin holes in uniform way along circumference; The end face of the intermediate section of said retainer is provided with the some and said corresponding perforation of stating on the machine envelope axle sleeve of positioning pin hole, so that said retainer is installed on the said machine envelope axle sleeve through some locating studs.
7. the machine seal apparatus that is used for the house service pump of nuclear power station according to claim 1 is characterized in that said rotating ring is fixed on the said retainer through pin.
8. the machine seal apparatus that is used for the house service pump of nuclear power station according to claim 1; It is characterized in that, reach between the said retainer between said machine envelope axle sleeve and the said pump shaft, between said retainer and the said rotating ring, be respectively equipped with seal ring between said stationary ring and said machine sealed cover and the said machine sealing chamber body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100834409A CN102606518A (en) | 2012-03-27 | 2012-03-27 | Mechanical seal device of plant water pump for nuclear power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100834409A CN102606518A (en) | 2012-03-27 | 2012-03-27 | Mechanical seal device of plant water pump for nuclear power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102606518A true CN102606518A (en) | 2012-07-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100834409A Pending CN102606518A (en) | 2012-03-27 | 2012-03-27 | Mechanical seal device of plant water pump for nuclear power plant |
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| Country | Link |
|---|---|
| CN (1) | CN102606518A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104564788A (en) * | 2015-01-12 | 2015-04-29 | 大连华阳密封股份有限公司 | Dry gas seal for back pressure prevention pump used in medium which contains suspended solids |
| 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 |
| CN105179300A (en) * | 2015-09-10 | 2015-12-23 | 临涣中利发电有限公司 | Condensate pump shaft seal device |
| CN109983263A (en) * | 2016-11-22 | 2019-07-05 | 株式会社华尔卡 | Construction practices device, Construction practices method, Construction practices system and the mechanical sealing member of mechanical sealing member |
| CN112313435A (en) * | 2018-06-18 | 2021-02-02 | 维京帕公司 | Double-sealing lubricating packing gland and rotary sleeve |
| CN114688082A (en) * | 2022-04-28 | 2022-07-01 | 宁波方太厨具有限公司 | Blade, impeller applying same, fan system and range hood |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03222898A (en) * | 1990-01-25 | 1991-10-01 | Nikoku Kikai Kogyo Kk | Pumping plant |
| CN2374680Y (en) * | 1999-04-26 | 2000-04-19 | 艾志(南京)机械工业技术有限公司 | Container type mechanical seal |
| CN201351631Y (en) * | 2008-12-16 | 2009-11-25 | 神华集团有限责任公司 | Mechanical sealing device for high-temperature coal pulp pump |
| CN201368055Y (en) * | 2009-01-08 | 2009-12-23 | 张家港华青科技有限公司 | Mechanical sealing device for pumps |
| CN102116309A (en) * | 2010-12-30 | 2011-07-06 | 上海阿波罗机械股份有限公司 | Mechanical sealing device for centrifugal pump |
| CN202597210U (en) * | 2012-03-27 | 2012-12-12 | 上海阿波罗机械股份有限公司 | Mechanical seal device for service water pump for nuclear power plant |
-
2012
- 2012-03-27 CN CN2012100834409A patent/CN102606518A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03222898A (en) * | 1990-01-25 | 1991-10-01 | Nikoku Kikai Kogyo Kk | Pumping plant |
| CN2374680Y (en) * | 1999-04-26 | 2000-04-19 | 艾志(南京)机械工业技术有限公司 | Container type mechanical seal |
| CN201351631Y (en) * | 2008-12-16 | 2009-11-25 | 神华集团有限责任公司 | Mechanical sealing device for high-temperature coal pulp pump |
| CN201368055Y (en) * | 2009-01-08 | 2009-12-23 | 张家港华青科技有限公司 | Mechanical sealing device for pumps |
| CN102116309A (en) * | 2010-12-30 | 2011-07-06 | 上海阿波罗机械股份有限公司 | Mechanical sealing device for centrifugal pump |
| CN202597210U (en) * | 2012-03-27 | 2012-12-12 | 上海阿波罗机械股份有限公司 | Mechanical seal device for service water pump for nuclear power plant |
Cited By (8)
| 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 |
| CN104564788A (en) * | 2015-01-12 | 2015-04-29 | 大连华阳密封股份有限公司 | Dry gas seal for back pressure prevention pump used in medium which contains suspended solids |
| CN105179300A (en) * | 2015-09-10 | 2015-12-23 | 临涣中利发电有限公司 | Condensate pump shaft seal device |
| CN109983263A (en) * | 2016-11-22 | 2019-07-05 | 株式会社华尔卡 | Construction practices device, Construction practices method, Construction practices system and the mechanical sealing member of mechanical sealing member |
| TWI725232B (en) * | 2016-11-22 | 2021-04-21 | 日商華爾卡股份有限公司 | Mechanical seal construction practice device, construction practice method, construction practice system, and mechanical seal |
| CN112313435A (en) * | 2018-06-18 | 2021-02-02 | 维京帕公司 | Double-sealing lubricating packing gland and rotary sleeve |
| CN114688082A (en) * | 2022-04-28 | 2022-07-01 | 宁波方太厨具有限公司 | Blade, impeller applying same, fan system and range hood |
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Application publication date: 20120725 |