CN102606511A - Bearing protector for residual heat removal pump for nuclear power station - Google Patents
Bearing protector for residual heat removal pump for nuclear power station Download PDFInfo
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- CN102606511A CN102606511A CN2012100833035A CN201210083303A CN102606511A CN 102606511 A CN102606511 A CN 102606511A CN 2012100833035 A CN2012100833035 A CN 2012100833035A CN 201210083303 A CN201210083303 A CN 201210083303A CN 102606511 A CN102606511 A CN 102606511A
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- cover
- rotor
- stator
- maze trough
- pump shaft
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Abstract
The invention discloses a bearing protector for a residual heat removal pump for a nuclear power station. The bearing protector comprises a rotor sleeve, a stator sleeve, a disconnector and an exciter. A stepped labyrinth groove with a high inside and a low outside is arranged on the rear end face of the rotor sleeve, the inner end face of the rotor sleeve is in interference fit with a pump shaft, and the rotor sleeve is fixed onto the pump shaft through a sealing ring of the rotor sleeve. A stepped labyrinth groove with a low inside and a high outside is arranged on the front end face of the stator sleeve, the outer end face of the stator sleeve is in interference fit with an inner cavity surface of a bearing gland, the inner end face of the stator sleeve is in clearance fit with the pump shaft, the stator sleeve is positioned in the rear of the rotor sleeve in such a manner that the wall of the labyrinth groove of the stator sleeve is embedded into the labyrinth groove of the rotor sleeve in a gapped mode, the stator sleeve is fixed onto the bearing gland through a sealing ring of the stator sleeve, a zigzag sealing channel is formed by the labyrinth groove of the stator sleeve and the labyrinth groove of the rotor sleeve, and both the disconnector and the exciter are arranged in the sealing channel. Moreover, when the pump shaft is static, the disconnector is matched with the exciter to close the sealing channel, and when the pump shaft rotates, the disconnector is separated from the exciter to open the sealing channel.
Description
Technical field
The present invention relates to a kind of used in nuclear power station residual heat removal pump, be specifically related to a kind of bearing protector of used in nuclear power station residual heat removal pump.
Background technique
It is horizontal, single-stage, single suction, cantilever type centrifugal pump that present million kilowatt pressurized-water reactor nuclear power plant uses the structural type of residual heat removal pump, and the major function of this pump is: discharge reactor core waste heat, discharge a loop and equipment sensible heat, discharge the heat that main pump produces.
Because the medium that residual heat removal pump is carried and be to carry thermostatic medium, but carry the alternating temperature medium unlike other pump.The variation of medium temperature can make the inlet pressure of pump change; This has just caused the polytrope of pump axial force, and then makes the ball bearing that bears axial force receive extra load, produces bigger heat; Cause this pump generally to have the bearing heating amount big, problems such as bearing life weak point.
Existing solution residual heat removal pump all is employed in the method for opening several small through hole on the anti-drive end end face of bearing support to the destruction problem of bearing and lubricating grease at high-temperature steam under the LOCA environment.Though this method has solved the problem of above-mentioned existence, brought new trouble again, that be exactly under the LOCA environment high-temperature steam in the containment and condensed water get in bearing suppories through these several small through hole, thereby destroyed capability of lubricating grease.
Summary of the invention
The objective of the invention is in order to overcome the deficiency of existing technology; A kind of bearing protector of used in nuclear power station residual heat removal pump is provided; It can prevent the premature failure of bearing and lubricating grease, has solved especially that high-temperature steam and issuable condensed water get into the destruction problem of bearing to lubricating grease under the LOCA environment.
The technological scheme that realizes above-mentioned purpose is: a kind of bearing protector of used in nuclear power station residual heat removal pump, be installed between bearing gland and the pump shaft, and this bearing protector comprises rotor cover, stator cover, cutter and exciter, wherein,
The ear end face of said rotor cover is provided with low inside and high outside step type maze trough, and the interior edge face and the said pump shaft of this rotor cover are interference fit, and this rotor cover is fixed on the said pump shaft through rotor cover seal ring;
Low outer high step type maze trough in the front-end face of said stator cover is provided with; The exterior edge face of this stator cover and the inner cavity surface of said bearing gland are interference fit; The interior edge face and the said pump shaft of this stator cover are Spielpassung; This stator cover mode in the maze trough of said rotor cover of being embedded in gap with the cell wall of its maze trough is positioned at the rear portion of said rotor cover and is fixed on the said bearing gland through stator cover seal ring, makes the maze trough of said stator cover and the maze trough of said rotor cover constitute tortuous sealing channel;
Said cutter and exciter all are located in the said sealing channel; And when said pump shaft was static, said exciter and said cutter coincide and sealing channel are sealed; When said pump shaft rotated, said exciter separated with said cutter and sealing channel is opened.
The bearing protector of above-mentioned used in nuclear power station residual heat removal pump; Wherein, The maze trough that said stator puts has three roads, and the maze trough that said rotor puts has two roads, and the rear end of the interior edge face of said rotor cover also is provided with a step hole; The internal groove side wall of the interior road maze trough of said stator cover is embedded in the step hole of said rotor cover with gap
The bearing protector of above-mentioned used in nuclear power station residual heat removal pump, wherein, said cutter and exciter all are located in the interior side line maze trough of said rotor cover.
The bearing protector of above-mentioned used in nuclear power station residual heat removal pump, wherein, the exterior edge face of the interior edge face of said stator cover and said rotor cover is respectively equipped with a hydrops groove.
The bearing protector of above-mentioned used in nuclear power station residual heat removal pump, wherein, said bearing protector also comprise one be located at the outer side line maze trough of said stator cover the middle part cell wall that overlaps of external groove sidevall and said rotor between the end face backplate.
The technological scheme of the bearing protector of used in nuclear power station residual heat removal pump of the present invention; The front-end face that is employed in the stator collar axially is provided with maze trough; Ear end face at the rotor cover axially is provided with maze trough, and in the indentation sealing channel that is made up of stator cover and rotor cover, cutter and exciter is set, when pump shaft rotates; Exciter separates with cutter and sealing channel is opened, and makes the ventilating performance of bearing good, good heat dissipation effect.The rotor cover adopts two O shape circle interference fit to carry out transmission with pump shaft; Wearing and tearing have been avoided to the pump shaft surface; Reduce maintenance or changed the cost that pump shaft brings; And the sealing effect to bearing improves greatly, and then has stoped the interior destruction to lubricating grease of the entering of the steam in containment bearing support under the LOCA environment.
Description of drawings
Fig. 1 is the structural representation of the bearing protector of used in nuclear power station residual heat removal pump of the present invention;
Fig. 2 is the enlarged view of I part among Fig. 1.
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 and Fig. 2, the bearing protector of a kind of used in nuclear power station residual heat removal pump of the present invention is installed between pump shaft 10 and the bearing gland 20.This bearing protector comprises rotor cover 1, stator cover 2, cutter 3, exciter 4 and end face backplate 5, wherein:
The ear end face of rotor cover 1 is provided with the low inside and high outside step type maze trough in two roads; And the rear end of its interior edge face also is provided with a step hole; The exterior edge face of rotor cover 1 is provided with a hydrops groove 13; Interior edge face and the pump shaft 10 of this rotor cover 1 be interference fit, and this rotor overlaps 1 through overlapping seal rings 11,12 and be fixed on the pump shaft 10 in that two rotors being set on the interior edge face;
The front-end face of stator cover 2 is provided with low outer high step type maze trough in three roads; The exterior edge face of this stator cover 2 and the inner cavity surface of bearing gland 20 are interference fit; The interior edge face of this stator cover 2 and pump shaft 10 are for Spielpassung and be provided with a hydrops groove 22; This stator cover 2 cell walls with its maze trough mode in the maze trough of rotor cover 1 of being embedded in gap is positioned at the rear portion of rotor cover 1; This stator cover 2 is through being fixed on the bearing gland 20 in that stator cover seal ring 21 is set on the exterior edge face, makes the maze trough of maze trough and the rotor cover 1 of stator cover 2 constitute tortuous sealing channel and be arranged in rotor and overlaps 1 side line maze trough;
External groove sidevall and the rotor that end face backplate 5 is located at the outer side line maze trough of stator cover 2 overlaps between 1 the middle part cell wall.
11,12 and stator covers of two rotor cover seal rings seal ring 21 is O-ring seals.
Compare bearing protector long service life, good, the good sealing effect of ventilating performance with labyrinth sealing and outside framework oil seal.
Those of ordinary skill in the art will be appreciated that; Above embodiment is used for explaining the present invention; And be not to be used as 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 (5)
1. the bearing protector of a used in nuclear power station residual heat removal pump is installed between bearing gland and the pump shaft, and this bearing protector comprises rotor cover, stator cover, cutter and exciter, it is characterized in that,
The ear end face of said rotor cover is provided with low inside and high outside step type maze trough, and the interior edge face and the said pump shaft of this rotor cover are interference fit, and this rotor cover is fixed on the said pump shaft through rotor cover seal ring;
Low outer high step type maze trough in the front-end face of said stator cover is provided with; The exterior edge face of this stator cover and the inner cavity surface of said bearing gland are interference fit; The interior edge face and the said pump shaft of this stator cover are Spielpassung; This stator cover mode in the maze trough of said rotor cover of being embedded in gap with the cell wall of its maze trough is positioned at the rear portion of said rotor cover and is fixed on the said bearing gland through stator cover seal ring, makes the maze trough of said stator cover and the maze trough of said rotor cover constitute tortuous sealing channel;
Said cutter and exciter all are located in the said sealing channel; And when said pump shaft was static, said exciter and said cutter coincide and sealing channel are sealed; When said pump shaft rotated, said exciter separated with said cutter and sealing channel is opened.
2. the bearing protector of used in nuclear power station residual heat removal pump according to claim 1; It is characterized in that; The maze trough that said stator puts has three roads, and the maze trough that said rotor puts has two roads, and the rear end of the interior edge face of said rotor cover also is provided with a step hole; The internal groove side wall of the interior road maze trough of said stator cover is embedded in the step hole of said rotor cover with gap
3. the bearing protector of used in nuclear power station residual heat removal pump according to claim 2 is characterized in that, said cutter and exciter all are located in the interior side line maze trough of said rotor cover.
4. the bearing protector of used in nuclear power station residual heat removal pump according to claim 1 and 2 is characterized in that, the exterior edge face of the interior edge face of said stator cover and said rotor cover is respectively equipped with a hydrops groove.
5. the bearing protector of used in nuclear power station residual heat removal pump according to claim 1 and 2; It is characterized in that, said bearing protector also comprise one be located at the outer side line maze trough of said stator cover the middle part cell wall that overlaps of external groove sidevall and said rotor between the end face backplate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100833035A CN102606511A (en) | 2012-03-27 | 2012-03-27 | Bearing protector for residual heat removal pump for nuclear power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100833035A CN102606511A (en) | 2012-03-27 | 2012-03-27 | Bearing protector for residual heat removal pump for nuclear power station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102606511A true CN102606511A (en) | 2012-07-25 |
Family
ID=46524180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100833035A Pending CN102606511A (en) | 2012-03-27 | 2012-03-27 | Bearing protector for residual heat removal pump for nuclear power station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102606511A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5378000A (en) * | 1992-10-19 | 1995-01-03 | Inpro Companies, Inc. | Shaft seal assembly |
| US7052014B1 (en) * | 1999-02-04 | 2006-05-30 | Orlowski David C | Snap together bearing isolator |
| US20100219585A1 (en) * | 2004-07-12 | 2010-09-02 | Alan James Roddis | Isolator seal |
| US20110002742A1 (en) * | 2007-11-08 | 2011-01-06 | Alasdair Maconocie | Outer pipe sleeve for sea floor mooring pile |
| CN202597183U (en) * | 2012-03-27 | 2012-12-12 | 上海阿波罗机械股份有限公司 | Bearing protector for residual heat removal pump for nuclear power station |
-
2012
- 2012-03-27 CN CN2012100833035A patent/CN102606511A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5378000A (en) * | 1992-10-19 | 1995-01-03 | Inpro Companies, Inc. | Shaft seal assembly |
| US7052014B1 (en) * | 1999-02-04 | 2006-05-30 | Orlowski David C | Snap together bearing isolator |
| US20100219585A1 (en) * | 2004-07-12 | 2010-09-02 | Alan James Roddis | Isolator seal |
| US20110002742A1 (en) * | 2007-11-08 | 2011-01-06 | Alasdair Maconocie | Outer pipe sleeve for sea floor mooring pile |
| CN202597183U (en) * | 2012-03-27 | 2012-12-12 | 上海阿波罗机械股份有限公司 | Bearing protector for residual heat removal pump for nuclear power station |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120725 |