CN212003696U - Multistage centrifugal pump bearing started at low rotating speed - Google Patents
Multistage centrifugal pump bearing started at low rotating speed Download PDFInfo
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- CN212003696U CN212003696U CN202020655522.6U CN202020655522U CN212003696U CN 212003696 U CN212003696 U CN 212003696U CN 202020655522 U CN202020655522 U CN 202020655522U CN 212003696 U CN212003696 U CN 212003696U
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- assembly
- rolling
- multistage centrifugal
- centrifugal pump
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Abstract
The utility model provides a multistage centrifugal pump bearing that low rotational speed starts, including the bearing assembly, the switching subassembly, first locating component, second locating component and buffering subassembly, the bearing assembly assembles on the pump shaft, the switching subassembly is located the bearing room, the switching subassembly is arranged in to the bearing assembly, and assemble in the bearing room through this switching subassembly, first locating component assembles in the opening part of bearing room, and link up with the switching subassembly, fix a position the switching subassembly by first locating component, the second locating component assembles at the pump shaft end, and link up with the bearing assembly, fix a position the bearing assembly by the second locating component, the buffering subassembly is located the bearing room, and link up with the switching subassembly, cushion the axial motion of switching subassembly in the bearing room by the buffering subassembly. The spring group arranged through the balance disc pushes the rolling bearing, so that the pump shaft is pushed, the balance disc is separated from the balance hub, friction is avoided, the service life is prolonged, and the maintenance cost is saved.
Description
Technical Field
The utility model relates to a centrifugal pump especially relates to a multistage centrifugal pump bearing structure that low rotational speed starts.
Background
In the prior art, two sides of a pump shaft of a boiler feed pump with secondary high pressure are respectively provided with a bearing bush structure, the axial movement of the pump shaft in the operation process is related to the opening and closing degree between a balance disc and a balance hub, the opening and closing degree is closely related to the pressure of the pump water, and finally the rotation speed is determined. If the water supply pump is driven by a motor, the rotating speed of the water supply pump can reach the rated rotating speed of the pump within a few seconds, the opening degree between the balance disk and the balance hub is basically in a fully-open state and is close to a design value, and friction between two parts cannot be caused. The structure has the advantages of simple structure, convenient installation, cost saving, small using amount of lubricating oil, convenient maintenance and lubricating oil addition, running at a rated rotating speed, stable temperature and vibration and deep reliability of users.
However, when the steam turbine or the diesel engine is driven, the operation time at a low rotating speed is longer, about 45min, and the water pump operates at the rotating speed, the water outlet pressure of the pump is very low, and sufficient force is not applied, so that the balance disc and the balance hub of the water supply pump are opened, the pair of friction pairs of the balance disc and the balance hub are seriously abraded, the pair of friction pairs are completely seized by a serious person, and the equipment cannot normally operate. Therefore, it is necessary to optimize the structure thereof to overcome the above-mentioned drawbacks.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a multistage centrifugal pump bearing that low rotational speed starts to guarantee that balanced hub and balance plate open under the low rotational speed, make the operation that steam turbine, diesel engine driven inferior high-pressure boiler feed pump can be stable.
The utility model discloses a solve the technical scheme that its technical problem adopted and be:
a low speed start multistage centrifugal pump bearing comprising:
a bearing assembly mounted on the pump shaft;
the adapter assembly is positioned in the bearing chamber, and the bearing assembly is arranged in the adapter assembly and is assembled in the bearing chamber through the adapter assembly;
the first positioning component is assembled at the opening of the bearing chamber, is connected with the adapter component and is used for positioning the adapter component;
the second positioning component is assembled at the tail end of the pump shaft and is connected with the bearing component, and the bearing component is positioned by the second positioning component;
and the buffer assembly is positioned in the bearing chamber and is connected with the switching assembly, and the buffer assembly buffers the axial movement of the switching assembly in the bearing chamber.
Specifically, the bearing assembly includes:
and the inner ring of the rolling bearing is sleeved on the pump shaft, and the outer ring of the rolling bearing is fixed in the switching component. In one embodiment of the present invention, the rolling bearings are provided in a pair, and the rolling bearings are disposed in series.
Further, the adapter assembly includes:
and the bearing box is arranged in the bearing chamber and can move in the bearing chamber along the axial direction, and the outer ring of the rolling bearing is fixed in the bearing chamber.
Further, the first positioning component includes:
and the bearing end cover is assembled at the opening of the bearing chamber through a connecting piece, and the inner edge of the bearing end cover is propped against the outer end face of the bearing box to axially limit the bearing box.
Further, the second positioning assembly includes:
the fastening nut is screwed at the tail end of the pump shaft, one end of an inner ring of the rolling bearing props against a shaft shoulder of the pump shaft, and the other end of the inner ring of the rolling bearing props against the fastening nut;
the adjusting check ring is positioned between the shaft shoulder of the pump shaft and the inner ring of the rolling bearing, and the inner ring of the rolling bearing is axially positioned by the fastening nut and the adjusting check ring together;
the inner wall of the bearing box is embedded in the elastic retainer ring, one end of the outer ring of the rolling bearing abuts against the limiting table on the inner wall of the bearing box, the other end of the outer ring of the rolling bearing abuts against the elastic retainer ring, and the outer ring of the rolling bearing is axially positioned by the elastic retainer ring.
Further, the buffer assembly includes:
the spring sleeve is positioned between the sliding bearing and the bearing box;
and the spring set is arranged in the spring sleeve, one end of the spring set props against the spring sleeve, and the other end of the spring set props against the bearing box. The spring group is mainly used for ensuring that the inner ring and the outer ring of a pair of series-connected rolling bearings are always on the plane, and preventing the phenomena of heating, vibration and the like of the bearing caused by the fact that the bearing is damaged by uneven stress of the inner ring and the outer ring.
In one embodiment of the present invention, the rolling bearing is an angular contact ball bearing.
The utility model has the advantages that:
this multistage centrifugal pump bearing that low rotational speed starts installs additional on the pump shaft, promotes antifriction bearing through its spring assembly that sets up, and then promotes the pump shaft, makes balance disc and balanced hub separation, avoids the friction to increase of service life practices thrift cost of maintenance.
Drawings
Fig. 1 is a schematic view of the installation state of a low-speed-start multistage centrifugal pump bearing according to the present invention;
fig. 2 is a schematic view showing a state in which the balance hub and the balance disk are mounted.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention will be further described with reference to the drawings and the specific embodiments.
As shown in fig. 1, the utility model provides a multistage centrifugal pump bearing that low rotational speed starts includes the bearing assembly, switching subassembly, first locating component, second locating component and buffering subassembly, the bearing assembly assembles on pump shaft 100, switching subassembly is located bearing room 200, the switching subassembly is arranged in to the bearing assembly, and assemble in the bearing room through this switching subassembly, first locating component assembles in the opening part of bearing room, and link up with the switching subassembly, fix a position the switching subassembly by first locating component, second locating component assembles at the pump shaft end, and link up with the bearing assembly, fix a position the bearing assembly by second locating component, the buffering subassembly is located the bearing room, and link up with the switching subassembly, cushion the axial motion of switching subassembly in the bearing room by the buffering subassembly. Specifically, the bearing assembly includes a rolling bearing 301, an inner ring of which is sleeved on the pump shaft, and an outer ring of which is fixed in the adapter assembly. In the present embodiment, a pair of rolling bearings is provided, and the rolling bearings are placed in series. The adapter assembly comprises a bearing housing 401 which is disposed in the bearing chamber and is axially movable therein, and an outer ring of the rolling bearing is fixed in the bearing chamber. The first positioning assembly comprises a bearing end cover 501, the bearing end cover is assembled at the opening of the bearing chamber through a connecting piece, and the inner edge of the bearing end cover is propped against the outer end face of the bearing box to axially limit the bearing box. The second locating component comprises a fastening nut 601, an adjusting check ring 602 and an elastic check ring 603, the fastening nut is screwed on the tail end of the pump shaft, one end of the inner ring of the rolling bearing is abutted against the shaft shoulder of the pump shaft, the other end of the inner ring of the rolling bearing is abutted against the fastening nut, the adjusting check ring is located between the shaft shoulder of the pump shaft and the inner ring of the rolling bearing, the inner ring of the rolling bearing is axially located by the fastening nut and the adjusting check ring, the elastic check ring is embedded in the inner wall of the bearing box, one end of the outer ring of the rolling bearing is abutted against a limiting table on the inner wall of the bearing box, the other. Further, the buffering assembly comprises a spring sleeve 701 and a spring group 702, the spring sleeve is located between the sliding bearing and the bearing box, the spring group is arranged in the spring sleeve, one end of the spring group abuts against the spring sleeve, the other end of the spring group abuts against the bearing box, it is guaranteed that the inner ring and the outer ring of the rolling bearing are always on the plane, and the phenomenon that the bearing is damaged due to the fact that the bearing is unevenly stressed by the inner ring and the outer ring, heating and vibration of the rolling bearing are. In the embodiment, the rolling bearing is fully lubricated by an angular contact ball bearing, and the angular contact ball bearing is completely isolated from an original sliding bearing oil tank, so that the pollution of impurities formed in the structure in the operation process to the oil domain of the sliding bearing is avoided, and an oil film between the bearing bush and the pump shaft is damaged. This multistage centrifugal pump bearing that low rotational speed starts installs additional on the pump shaft, promotes antifriction bearing through its spring assembly that sets up, and then promotes the pump shaft, makes balance disc 800 and balanced hub 900 separation (as figure 2), avoids the friction to increase of service life practices thrift cost of maintenance.
The multistage centrifugal pump can be divided into three stages in the low-speed operation process: starting the machine instantly, running at low speed and running normally. The gaps between the balance disc and the balance hub are different from three stages, and the stress of the structure is different.
At the moment of starting: because the centrifugal pumps are started by closing the valves, the outlet valves are opened in 3-5s, and when the valves are not opened, the pressure in the pumps is higher, and the friction pairs are opened; when the pressure is reduced after the valve is completely opened, the friction pair is closed, and the opening and the closing are completed in the moment (3-5 s);
low-speed operation: in the process, due to the change of the pump output, the friction pair is discontinuously opened and closed, and the process is the process which most seriously damages the friction pair; the structure is mainly used in the process, namely, the closed displacement is limited, the opening and closing amount k between the friction pairs is determined by measuring the whole rotor play amount in the data calculation and assembly processes, then, the spring compression amount m is adjusted through the gasket, the spring compression amount is smaller than the opening and closing amount between the friction pairs, the difference value (k-m) between the spring compression amount and the opening and closing amount between the friction pairs can be determined according to specific calculation and measurement data in installation, the difference values of different products are different, the friction pairs can not be completely closed, a gap with the difference value (m-k) is always reserved, and friction is avoided between the friction pairs. At this time, the spring is compressed, and the force for limiting the closing is borne by the spring sleeve and the rolling bearing.
And (3) normal operation: in the process, the pump pumping force is normal, the friction pair is completely opened, the rolling bearing is not stressed any more, and the inner ring and the outer ring of the rolling bearing keep a plane through the rebound force of the spring. At the moment, the structure finishes the action, runs completely in a free state and is free from external force.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to let the technical personnel in the field understand the contents of the present invention and implement the present invention, and the protection scope of the present invention can not be limited thereby, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.
Claims (8)
1. A low speed start multistage centrifugal pump bearing comprising:
a bearing assembly mounted on the pump shaft;
the adapter assembly is positioned in the bearing chamber, and the bearing assembly is arranged in the adapter assembly and is assembled in the bearing chamber through the adapter assembly;
the first positioning component is assembled at the opening of the bearing chamber, is connected with the adapter component and is used for positioning the adapter component;
the second positioning component is assembled at the tail end of the pump shaft and is connected with the bearing component, and the bearing component is positioned by the second positioning component;
and the buffer assembly is positioned in the bearing chamber and is connected with the switching assembly, and the buffer assembly buffers the axial movement of the switching assembly in the bearing chamber.
2. A low speed start multistage centrifugal pump bearing according to claim 1, wherein the bearing assembly comprises:
and the inner ring of the rolling bearing is sleeved on the pump shaft, and the outer ring of the rolling bearing is fixed in the switching component.
3. A low-speed-actuated multistage centrifugal pump bearing according to claim 2, wherein:
the rolling bearings are provided with a pair, and all the rolling bearings are arranged in series.
4. A low-rpm start multistage centrifugal pump bearing according to claim 2, wherein the adapter assembly comprises:
and the bearing box is arranged in the bearing chamber and can move in the bearing chamber along the axial direction, and the outer ring of the rolling bearing is fixed in the bearing chamber.
5. A low speed actuated multistage centrifugal pump bearing according to claim 4, wherein the first positioning means comprises:
and the bearing end cover is assembled at the opening of the bearing chamber through a connecting piece, and the inner edge of the bearing end cover is propped against the outer end face of the bearing box to axially limit the bearing box.
6. A low speed actuated multistage centrifugal pump bearing according to claim 4, wherein the second positioning assembly comprises:
the fastening nut is screwed at the tail end of the pump shaft, one end of an inner ring of the rolling bearing props against a shaft shoulder of the pump shaft, and the other end of the inner ring of the rolling bearing props against the fastening nut;
the adjusting check ring is positioned between the shaft shoulder of the pump shaft and the inner ring of the rolling bearing, and the inner ring of the rolling bearing is axially positioned by the fastening nut and the adjusting check ring together;
the inner wall of the bearing box is embedded in the elastic retainer ring, one end of the outer ring of the rolling bearing abuts against the limiting table on the inner wall of the bearing box, the other end of the outer ring of the rolling bearing abuts against the elastic retainer ring, and the outer ring of the rolling bearing is axially positioned by the elastic retainer ring.
7. A slow rotating speed actuated multistage centrifugal pump bearing according to claim 4, wherein the damping means comprises:
the spring sleeve is positioned between the sliding bearing and the bearing box;
and the spring set is arranged in the spring sleeve, one end of the spring set props against the spring sleeve, and the other end of the spring set props against the bearing box.
8. A low-speed-actuated multistage centrifugal pump bearing according to claim 2, wherein:
the rolling bearing adopts an angular contact ball bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020655522.6U CN212003696U (en) | 2020-04-26 | 2020-04-26 | Multistage centrifugal pump bearing started at low rotating speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020655522.6U CN212003696U (en) | 2020-04-26 | 2020-04-26 | Multistage centrifugal pump bearing started at low rotating speed |
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| CN212003696U true CN212003696U (en) | 2020-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020655522.6U Active CN212003696U (en) | 2020-04-26 | 2020-04-26 | Multistage centrifugal pump bearing started at low rotating speed |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114278609A (en) * | 2021-12-29 | 2022-04-05 | 上海水泵制造有限公司 | Stop device for preventing boiler feed pump rotor from moving |
-
2020
- 2020-04-26 CN CN202020655522.6U patent/CN212003696U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114278609A (en) * | 2021-12-29 | 2022-04-05 | 上海水泵制造有限公司 | Stop device for preventing boiler feed pump rotor from moving |
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| CB03 | Change of inventor or designer information |
Inventor after: Lin Ting Inventor after: Zhu Yongbin Inventor after: Yu Xianchu Inventor before: Zhu Yongbin Inventor before: Yu Xianchu |