CN202597185U - Structure for reducing abrasion of sealing ring of coolant drain tank pump - Google Patents
Structure for reducing abrasion of sealing ring of coolant drain tank pump Download PDFInfo
- Publication number
- CN202597185U CN202597185U CN 201220118789 CN201220118789U CN202597185U CN 202597185 U CN202597185 U CN 202597185U CN 201220118789 CN201220118789 CN 201220118789 CN 201220118789 U CN201220118789 U CN 201220118789U CN 202597185 U CN202597185 U CN 202597185U
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- CN
- China
- Prior art keywords
- pump
- guide bearing
- impeller
- slide bushing
- sealing ring
- 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
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Abstract
The utility model discloses a structure for reducing abrasion of a sealing ring of a coolant drain tank pump, and the structure comprises an impeller which is installed on the lower part of a pump shaft and inside a water pressure chamber of a pump body, a sealing ring which is arranged between an outlet end of a rear cover plate of the impeller and the middle part of an inner cavity of the pump body and a guide bearing which is installed on the pump shaft and located on the upper part of the inner cavity of the pump body, wherein the guide bearing comprises a metal jacket and a slide bushing, the slide bushing is in interference fit with and embedded inside the inner cavity of the metal jacket, the slide bushing is made of engineering rubber, the upper end of the metal jacket is provided with a cover plate, the cover plate is uniformly provided with a plurality of installation holes, and the guide bearing is fixed on the pump body through a plurality of screws. According to the structure, the radial swinging amplitude of a rotor part at the starting moment and the stopping moment can be controlled so as to further narrow a clearance between the impeller and the sealing ring, so that the service life of the sealing ring is prolonged.
Description
Technical field
The utility model relates to a kind of reactor with freezing mixture drain tank pump, is specifically related to a kind of structure that reduces seal wears that is used for freezing mixture drain tank pump.
Background technique
The function of reactor coolant drain tank pump (abbreviation main pump) is to make freezing mixture form forced circulation, thereby is sent to steam generator to the heat energy that produces in the reactor, to produce steam, the driving steam turbine acting.Basic demand to it is:
1) can under the unmanned maintenance condition, work safely and reliably for a long time; Be convenient to maintenance, auxiliary system is simple;
2) Runner assembly should be able to provide enough rotary inertias, so that under the station blackout situation, utilizes the running down of main pump that enough flows are provided, and makes reactor core obtain suitable cooling;
3) to lack with the leakage rate of radioactive freezing mixture.
Impeller ring in the reactor coolant drain tank pump belongs to easily damaged parts; Because pump radial force, particularly pump have very big radial force starting and shut down moment, pump shaft and impeller can produce rigid deformation; Make the mutually friction and wearing and tearing of seal ring and impeller, thereby influence the working life of pump.Present freezing mixture drain tank pump adopts guide bearing to come bearing radial force in the bottom of pump shaft; This guide bearing is made by the tetrafluoro rubber material; So wearing and tearing are very fast; If things go on like this not only do not have the effect of bearing radial force, the wearing and tearing between impeller and the seal ring are also strengthened, and then the leakage rate of pumping chamber has also been strengthened.
Summary of the invention
The purpose of the utility model is in order to overcome the deficiency of existing technology; A kind of structure that is used for the minimizing seal wears of freezing mixture drain tank pump is provided; It can control the amplitude that radially wobble of rotor part in the moment that starts and shut down; And then can dwindle the gap between impeller and the seal ring, make seal ring obtain the longer life-span.
The technological scheme that realizes above-mentioned purpose is: a kind of structure that is used for the minimizing seal wears of freezing mixture drain tank pump; Seal ring between the outlet end of the back shroud that comprise the bottom and the impeller in the pumping chamber of the pump housing that are installed in pump shaft, is located at impeller and the inner chamber of the pump housing middle part and be installed on the pump shaft and be positioned at the guide bearing on the inner chamber top of the pump housing; Wherein, Said guide bearing comprises metal-coating and slide bushing; Be inlaid in the inner chamber of metal-coating to said slide bushing interference fit, the material of this slide bushing is an engineering rubber, and the upper end of said metal-coating has cover plate; Be provided with some mounting holes on this cover plate in uniform way, said guide bearing through some screw on the said pump housing.
The structure of the above-mentioned minimizing seal wears that is used for freezing mixture drain tank pump wherein, also is provided with the axle sleeve that is solidly set on the pump shaft between said pump shaft and the said guide bearing, is Spielpassung between the internal diameter of the slide bushing of said guide bearing and the external diameter of said axle sleeve.
The technological scheme of the structure of the minimizing seal wears that is used for freezing mixture drain tank pump of the utility model; Between the pump housing on the top of impeller and pump shaft, guide bearing is set; This guide bearing adopts the composite structure of metal-coating and slide bushing, and slide bushing and axle sleeve Spielpassung can limit the amplitude that radially wobbles of pump shaft, promptly limits the rigid deformation of pump shaft and has limited the radial motion of impeller; And then can dwindle the gap between impeller and the seal ring; Reach the purpose that reduces seal wears, made seal ring obtain the longer life-span, can also reduce the leakage rate of pumping chamber simultaneously.
Description of drawings
Fig. 1 is the structural representation of the minimizing seal wears that is used for freezing mixture drain tank pump of the utility model.
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, a kind of structure that is used for the minimizing seal wears of freezing mixture drain tank pump of the utility model comprises pump shaft 1, the pump housing 2, impeller 3, seal ring 4 and guide bearing 5, wherein:
The inner chamber of the pump housing 2 comprise the bottom pumping chamber, middle part closed chamber and top bearing chamber and be up-small and down-big secondary stepped shaft cylindrical cavity; Pumping chamber is used to hold impeller 3; Closed chamber is used to install seal ring 4, the outer circumferential face gap of the outlet end of the inner peripheral surface of sealing ring 4 and impeller 3 back shrouds relatively; Bearing chamber is used to install guide bearing 5;
Guide bearing 5 comprises metal-coating 51 and slide bushing 52; The material of this slide bushing 52 be engineering rubber and interference fit be inlaid in the inner chamber of metal-coating 51; The upper end of metal-coating 51 has cover plate, is provided with some mounting holes on this cover plate in uniform way, is installed on the axle sleeve 6 and through some screws 50 to these guide bearing 5 Spielpassung to be fixed on the pump housing 2.
Gap between the external diameter of internal diameter and axle sleeve 6 through control slide bushing 52; Can control the amplitude that radially wobble of rotor part in the moment that starts and shut down; And then can dwindle the gap between impeller 3 and the seal ring 4; Reduce the wearing and tearing of seal ring 4, make seal ring 4 obtain the longer life-span and reduce the leakage rate of pumping chamber.
Because the slide bushing 52 of guide bearing 5 is the WR300 engineering rubber that adopts U.S. Greene Tweed company, this project rubber is that a kind of long carbon fiber adds polyether-ether-ketone resin to strengthen pressing mold made.Polyether-ether-ketone resin has added intensity, stability and the thermal diffusivity of having strengthened material behind the long carbon fiber; And the thermoplastic engineering plastic that has surmounted other kind; The wear resistance of slide bushing 52 is strengthened; Pump is in operation can not take place seize to cause the phenomenon of pump shaft fracture, but bearing radial force well.Guide bearing also adopts the branch body structure, after slide bushing 52 wearing and tearing, can be convenient for changing.Axle sleeve 6 also can avoid pump shaft 1 directly relative with guide bearing in addition, plays the effect of protection pump shaft.
Those of ordinary skill in the art will be appreciated that; Above embodiment is used for explaining the utility model; And be not with the qualification of doing 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 (2)
1. structure that is used for the minimizing seal wears of freezing mixture drain tank pump; Seal ring between the outlet end of the back shroud that comprise the bottom and the impeller in the pumping chamber of the pump housing that are installed in pump shaft, is located at impeller and the inner chamber of the pump housing middle part and be installed on the pump shaft and be positioned at the guide bearing on the inner chamber top of the pump housing; It is characterized in that; Said guide bearing comprises metal-coating and slide bushing; Be inlaid in the inner chamber of metal-coating to said slide bushing interference fit, the material of this slide bushing is an engineering rubber, and the upper end of said metal-coating has cover plate; Be provided with some mounting holes on this cover plate in uniform way, said guide bearing through some screw on the said pump housing.
2. the structure that is used for the minimizing seal wears of freezing mixture drain tank pump according to claim 1; It is characterized in that; Also being provided with the axle sleeve that is solidly set on the pump shaft between said pump shaft and the said guide bearing, is Spielpassung between the internal diameter of the slide bushing of said guide bearing and the external diameter of said axle sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220118789 CN202597185U (en) | 2012-03-27 | 2012-03-27 | Structure for reducing abrasion of sealing ring of coolant drain tank pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220118789 CN202597185U (en) | 2012-03-27 | 2012-03-27 | Structure for reducing abrasion of sealing ring of coolant drain tank pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202597185U true CN202597185U (en) | 2012-12-12 |
Family
ID=47314732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220118789 Expired - Lifetime CN202597185U (en) | 2012-03-27 | 2012-03-27 | Structure for reducing abrasion of sealing ring of coolant drain tank pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202597185U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102606512A (en) * | 2012-03-27 | 2012-07-25 | 上海阿波罗机械股份有限公司 | Structure for reducing abrasion of seal ring for coolant drain tank pump |
-
2012
- 2012-03-27 CN CN 201220118789 patent/CN202597185U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102606512A (en) * | 2012-03-27 | 2012-07-25 | 上海阿波罗机械股份有限公司 | Structure for reducing abrasion of seal ring for coolant drain tank pump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121212 |
|
| CX01 | Expiry of patent term |