CN202597183U - 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 PDF

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Publication number
CN202597183U
CN202597183U CN 201220118776 CN201220118776U CN202597183U CN 202597183 U CN202597183 U CN 202597183U CN 201220118776 CN201220118776 CN 201220118776 CN 201220118776 U CN201220118776 U CN 201220118776U CN 202597183 U CN202597183 U CN 202597183U
Authority
CN
China
Prior art keywords
cover
rotor
stator
pump shaft
maze trough
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 - Lifetime
Application number
CN 201220118776
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Chinese (zh)
Inventor
陆金琪
张晓库
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Apollo Machinery Co Ltd
Original Assignee
Shanghai Apollo Machinery Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shanghai Apollo Machinery Co Ltd filed Critical Shanghai Apollo Machinery Co Ltd
Priority to CN 201220118776 priority Critical patent/CN202597183U/en
Application granted granted Critical
Publication of CN202597183U publication Critical patent/CN202597183U/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

The utility model 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

A kind of bearing protector of used in nuclear power station residual heat removal pump
Technical field
The utility model relates to a kind of used in nuclear power station residual heat removal pump, is 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 purpose of the utility model 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 the used in nuclear power station residual heat removal pump of the utility model; 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 bearing protector of the used in nuclear power station residual heat removal pump of the utility model;
Fig. 2 is the enlarged view of I part among Fig. 1.
Embodiment
In order to understand the technological scheme of the utility model 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 utility model 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;
Cutter 3 all is located in the sealing channel with exciter 4, and when pump shaft 10 was static, exciter 4 coincide with cutter 3 and with the sealing channel sealing, when pump shaft 10 rotates, exciter 4 since action of centrifugal force separate with cutter 3 and sealing channel opened.
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.
Rotor cover 1 in the bearing protector of a kind of used in nuclear power station residual heat removal pump of the utility model adopts two O shape circle interference fit to drive with pump shaft 10, thereby has exempted the wearing and tearing to pump shaft 10, has reduced maintenance or has changed the cost that pump shaft brings; Front-end face at stator cover 2 axially is provided with maze trough; Ear end face at rotor cover 1 axially is provided with maze trough; And in the indentation sealing channel that constitutes by rotor cover 1 and stator cover 2, cutter 3 and exciter 4 are set, when pump shaft 10 was static, exciter 4 coincide with cutter 3 and sealing channel is sealed; Prevented the premature failure of bearing and lubricating grease, solved especially that high-temperature steam and issuable condensed water get into the destruction problem of bearing to lubricating grease under the LOCA environment; When pump shaft 10 rotated, exciter 4 separated with cutter 3 and sealing channel is opened, and made the ventilating performance of bearing good, good heat dissipation effect.
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 utility model; And be not the qualification that is used as the utility model; As long as in the connotation scope of the utility model, all will drop in claims scope of the utility model 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; 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, and 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.
CN 201220118776 2012-03-27 2012-03-27 Bearing protector for residual heat removal pump for nuclear power station Expired - Lifetime CN202597183U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220118776 CN202597183U (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
CN 201220118776 CN202597183U (en) 2012-03-27 2012-03-27 Bearing protector for residual heat removal pump for nuclear power station

Publications (1)

Publication Number Publication Date
CN202597183U true CN202597183U (en) 2012-12-12

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Family Applications (1)

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CN 201220118776 Expired - Lifetime CN202597183U (en) 2012-03-27 2012-03-27 Bearing protector for residual heat removal pump for nuclear power station

Country Status (1)

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CN (1) CN202597183U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102606511A (en) * 2012-03-27 2012-07-25 上海阿波罗机械股份有限公司 Bearing protector for residual heat removal pump for nuclear power station

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102606511A (en) * 2012-03-27 2012-07-25 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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CX01 Expiry of patent term

Granted publication date: 20121212

CX01 Expiry of patent term