CN204610352U - Multistage immersed pump axial force balance and bearing lubrication structure - Google Patents
Multistage immersed pump axial force balance and bearing lubrication structure Download PDFInfo
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- CN204610352U CN204610352U CN201520325503.6U CN201520325503U CN204610352U CN 204610352 U CN204610352 U CN 204610352U CN 201520325503 U CN201520325503 U CN 201520325503U CN 204610352 U CN204610352 U CN 204610352U
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- immersed pump
- bearing
- multistage
- axial force
- sleeve
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Abstract
The utility model belongs to immersed pump field, be specifically related to a kind of multistage immersed pump axial force balance and bearing lubrication structure, be included in the rear choma that the back shroud of impeller is arranged and the restrictor sleeve installed in the front-end bearing pedestal of rotating shaft, rear choma is assemblied in the endoporus of final stage stator, have first between rear choma cylindrical and final stage stator endoporus to be slidably matched gap, restrictor sleeve is arranged in the top of front-end bearing pedestal fore bearing, have second between restrictor sleeve cylindrical and front-end bearing pedestal inwall to be slidably matched gap, at the position of rotating shaft between described back shroud and described fore bearing, axle sleeve is installed, the cavity formed between rear choma and described axle sleeve is balance cylinder.By said structure, on the one hand eliminate special axial thrust balancing devices, multistage immersed pump structure is more simplified, compact, be convenient to the maintenance of pump, ensure that pressure and the flow of bearing lubrication liquid on the other hand, significantly improve the reliability of multistage immersed pump, extend its working life.
Description
Technical field
The utility model relates to a kind of multistage immersed pump axial force balance and bearing lubrication structure, belongs to immersed pump field.
Background technique
Operationally, impeller eye effect inlet pressure, and the back shroud corresponding with impeller eye acts on higher outlet pressure, to cause on impeller effect usually to have the axial force pointing to entrance to traditional immersed pump; Because multiple axial force of impeller superposes, on multistage pump, axial force is comparatively large, generally need arrange special axial thrust balancing devices after impeller, make pump structure more complicated, and size increases.In addition, immersed pump uses in seal container, and bearing relies on cryogenic liquide lubrication, tighter to the traffic requirement of cryogenic liquide, lubricating fluid is too much, then lose liquid many, pump efficiency reduces, lubricating fluid is very few, then easily cause lubrication failure because of liquid gasification, makes bearing damage.
Model utility content
According to above deficiency of the prior art, the technical problems to be solved in the utility model is: provide a kind of simple and compact for structure, can balancing axial thrust and ensure the pressure of bearing lubrication liquid and the multistage immersed pump axial force balance of flow and bearing lubrication structure.
Multistage immersed pump axial force balance described in the utility model and bearing lubrication structure, be included in the rear choma that the back shroud of impeller is arranged and the restrictor sleeve installed in the front-end bearing pedestal of rotating shaft, rear choma is assemblied in the endoporus of final stage stator, have first between rear choma cylindrical and final stage stator endoporus to be slidably matched gap, restrictor sleeve is arranged in the top of front-end bearing pedestal fore bearing, have second between restrictor sleeve cylindrical and front-end bearing pedestal inwall to be slidably matched gap, at the position of rotating shaft between described back shroud and described fore bearing, axle sleeve is installed, the cavity formed between rear choma and described axle sleeve is balance cylinder.
Working principle and process:
The pressure in impeller outlet port is pump discharge pressure, is multistage immersed pump pressure highest point; The pressure of restrictor sleeve outside is pump inlet pressure, is multistage immersed pump pressure lowest part.Under differential pressure action, liquid through after first between choma and final stage stator to be slidably matched gap, pressure reduces, and flow into balance cylinder, then upwards flow through and lubricate fore bearing, outwards flowing out (amount of liquid of outflow is lubrication flow) through the gap that is slidably matched of second between restrictor sleeve and fore bearing.Balance cylinder's pressure and lubrication flow depend on the resistance coefficient of each matching gap, by adjusting the size of each matching gap, make it have suitable resistance coefficient, can obtain required balance cylinder's pressure and lubrication flow.
Because balance cylinder's pressure is lower than the pressure of impeller ingress, the axial force that impeller acts on is made to point to the opposition side of impeller entrance, this power can with the axial force automotive resistance of the entrance separately of the sensing that acts on other impellers, thus reach the object of balancing axial thrust.
By multistage immersed pump axial force balance described in the utility model and bearing lubrication structure, on the one hand, eliminate special axial thrust balancing devices, make multistage immersed pump designs simplification and compacter, be convenient to the maintenance of pump, on the other hand, ensure that pressure and the flow of bearing lubrication liquid, thus the reliability of multistage immersed pump can be significantly improved, and extend its working life.
The beneficial effect that the utility model is compared with prior art had is:
This multistage immersed pump axial force balance and bearing lubrication structure, reasonable in design, by this structure, eliminate special axial thrust balancing devices on the one hand, multistage immersed pump structure is more simplified, compact, be convenient to the maintenance of pump, ensure that on the other hand pressure and the flow of bearing lubrication liquid, significantly improve the reliability of multistage immersed pump, extend its working life.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
In figure: 1, impeller; 2, back shroud; 3, rear choma; 4, final stage stator; 5, first to be slidably matched gap; 6, front-end bearing pedestal; 7, fore bearing; 8, restrictor sleeve; 9, second to be slidably matched gap; 10, rotating shaft; 11, axle sleeve; 12, balance cylinder; 13, impeller outlet; 14, impeller entrance.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further:
As shown in Figure 1, multistage immersed pump axial force balance described in the utility model and bearing lubrication structure are included in the rear choma 3 that the back shroud 2 of impeller 1 is arranged and the restrictor sleeve 8 installed in the front-end bearing pedestal 6 of rotating shaft 10, rear choma 3 is assemblied in the endoporus of final stage stator 4, have first between rear choma 3 cylindrical and final stage stator 4 endoporus to be slidably matched gap 5, restrictor sleeve 8 is arranged in the top of front-end bearing pedestal 6 fore bearing 7, have second between restrictor sleeve 8 cylindrical and front-end bearing pedestal 6 inwall to be slidably matched gap 9, at the position of rotating shaft 10 between described back shroud 2 and described fore bearing 7, axle sleeve 11 is installed, the cavity formed between rear choma 3 and described axle sleeve 11 is balance cylinder 12.
Working principle and process:
The pressure that impeller exports 13 places is pump discharge pressure, is multistage immersed pump pressure highest point; The pressure of restrictor sleeve 8 outside is pump inlet pressure, is multistage immersed pump pressure lowest part.Under differential pressure action, liquid through after first between choma 3 and final stage stator 4 to be slidably matched gap 5, pressure reduces, and flow into balance cylinder 12, then upwards flow through and lubricate fore bearing 7, outwards flowing out (amount of liquid of outflow is lubrication flow) through the gap 9 that is slidably matched of second between restrictor sleeve 8 and fore bearing 7.The pressure of balance cylinder 12 and lubrication flow depend on the resistance coefficient of each matching gap, by adjusting the size of each matching gap, make it have suitable resistance coefficient, can obtain required balance cylinder 12 pressure and lubrication flow.
Because balance cylinder 12 pressure is lower than the pressure at impeller entrance 14 place, the axial force of effect on impeller 1 is made to point to the opposition side of impeller entrance 14, this power can with the axial force automotive resistance of the entrance separately of the sensing that acts on other impellers, thus reach the object of balancing axial thrust.
By multistage immersed pump axial force balance described in the utility model and bearing lubrication structure, on the one hand, eliminate special axial thrust balancing devices, make multistage immersed pump designs simplification and compacter, be convenient to the maintenance of pump, on the other hand, ensure that pressure and the flow of bearing lubrication liquid, thus the reliability of multistage immersed pump can be significantly improved, and extend its working life.
Claims (1)
1. a multistage immersed pump axial force balance and bearing lubrication structure, it is characterized in that: be included in the rear choma (3) of the upper setting of back shroud (2) of impeller (1) and the middle restrictor sleeve (8) installed of front-end bearing pedestal (6) in rotating shaft (10), rear choma (3) is assemblied in the endoporus of final stage stator (4), have first between rear choma (3) cylindrical and final stage stator (4) endoporus to be slidably matched gap (5), restrictor sleeve (8) is arranged in the top of front-end bearing pedestal (6) fore bearing (7), have second between restrictor sleeve (8) cylindrical and front-end bearing pedestal (6) inwall to be slidably matched gap (9), at rotating shaft (10) position be positioned between described back shroud (2) and described fore bearing (7), axle sleeve (11) is installed, the cavity formed between rear choma (3) and described axle sleeve (11) is balance cylinder (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520325503.6U CN204610352U (en) | 2015-05-19 | 2015-05-19 | Multistage immersed pump axial force balance and bearing lubrication structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520325503.6U CN204610352U (en) | 2015-05-19 | 2015-05-19 | Multistage immersed pump axial force balance and bearing lubrication structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204610352U true CN204610352U (en) | 2015-09-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520325503.6U Active CN204610352U (en) | 2015-05-19 | 2015-05-19 | Multistage immersed pump axial force balance and bearing lubrication structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204610352U (en) |
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2015
- 2015-05-19 CN CN201520325503.6U patent/CN204610352U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |