CN207673601U - A kind of bearing assembly and borehole shaft driven (centrifugal) pump for borehole shaft driven (centrifugal) pump - Google Patents
A kind of bearing assembly and borehole shaft driven (centrifugal) pump for borehole shaft driven (centrifugal) pump Download PDFInfo
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- CN207673601U CN207673601U CN201721824079.5U CN201721824079U CN207673601U CN 207673601 U CN207673601 U CN 207673601U CN 201721824079 U CN201721824079 U CN 201721824079U CN 207673601 U CN207673601 U CN 207673601U
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- motor
- well pump
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- 239000010687 lubricating oil Substances 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 95
- 239000000498 cooling water Substances 0.000 claims description 27
- 230000005540 biological transmission Effects 0.000 claims description 14
- 230000008878 coupling Effects 0.000 claims description 11
- 238000010168 coupling process Methods 0.000 claims description 11
- 238000005859 coupling reaction Methods 0.000 claims description 11
- 238000005086 pumping Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 230000000712 assembly Effects 0.000 abstract 1
- 238000000429 assembly Methods 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 11
- 238000012423 maintenance Methods 0.000 description 4
- 239000004519 grease Substances 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000002262 irrigation Effects 0.000 description 2
- 238000003973 irrigation Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003809 water extraction Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
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- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model discloses a kind of bearing assemblies and borehole shaft driven (centrifugal) pump for borehole shaft driven (centrifugal) pump, can extend borehole shaft driven (centrifugal) pump service life.The bearing assembly includes bearing block, bearing and coil pipe, and the bearing is located on bearing block, and the bearing block is equipped with annular groove, and coil pipe is located in annular groove；In use, being equipped with lubricating oil in the annular groove, lubricating oil infiltrates bearing.
Description
Technical Field
The utility model belongs to the centrifugal pump field particularly, relates to a bearing assembly and major axis deep-well pump for major axis deep-well pump.
Background
The long shaft deep well pump is a water pumping device for pumping water from a well or rivers, lakes and seas to the ground, and is suitable for irrigation of towns, industrial and mining enterprises, farmlands and long-distance water pumping and conveying with underground water as a water source.
The working principle of the long-shaft deep-well pump is as follows: when the long-shaft deep-well pump is installed, its working components are submerged. When the long-axis deep well pump works, the motor at the top end operates to drive the transmission shaft and the working parts to operate, and after the working parts operate, water is lifted to the pump base part through the water filter screen, the working parts and the water pumping pipe and then is conveyed out by the pump base part.
In the prior art, a long-shaft deep-well pump can be generally provided with a common vertical motor. When the water pump is in operation, the motor does not bear the axial force of the pump, but bears the axial force by a thrust bearing additionally arranged on the pump. The thrust bearing is lubricated by grease, but as the operation time is prolonged, the temperature of the bearing is increased, and the grease can not play a role in lubrication, so that the bearing can operate at a high temperature state for a long time, the service life of the thrust bearing is shortened, the service cycle of the grease is shortened, and the maintenance cost is increased.
Disclosure of Invention
To above problem, the utility model provides a bearing assembly and major axis deep-well pump for major axis deep-well pump can prolong major axis deep-well pump life.
In order to solve the above problem, the embodiment of the present invention adopts the following technical solutions:
on the one hand, the embodiment of the utility model provides a bearing assembly for major axis deep-well pump, the bearing assembly includes bearing frame, bearing and coil pipe, the bearing is located the bearing frame, the bearing frame is equipped with the ring channel, the coil pipe is located the ring channel; when the bearing is used, lubricating oil is arranged in the annular groove and infiltrates the bearing.
As a preferred example, two ends of the coil pipe extend out of the bearing seat, one end is a water inlet end, and the other end is a water outlet end.
On the other hand, the embodiment of the utility model provides a long axis deep-well pump is still provided, its characterized in that, long axis deep-well pump includes motor, linkage segment, hollow shaft, pump seat, lifting pipe, transmission shaft, working member, strainer part and bearing assembly that contain the motor shaft; the connecting section is positioned between the motor and the pump base and is fixedly connected with the motor and the pump base respectively; the bearing assembly is positioned in the inner cavity of the connecting section, and the top end of the lifting pipe is fixedly connected with the bottom end of the pump base; the working part is positioned below the water lifting pipe, the water filter screen part is positioned below the working part, and the water filter screen part is fixedly connected with the working part; the bearing assembly comprises a bearing seat, a bearing and a coil pipe, wherein the bearing is positioned on the bearing seat, the bearing seat is provided with an annular groove, and the coil pipe is positioned in the annular groove; when in use, lubricating oil is arranged in the annular groove and infiltrates the bearing; the two ends of the coil pipe extend out of the bearing seats; the bearing seat is fixedly connected with the connecting section; the bearing assembly is fixed on the outer circle of the hollow shaft; the motor is connected with the hollow shaft through the elastic pin injection body to drive the hollow shaft to rotate; the hollow shaft is connected to the bearing block through a bearing assembly, the upper part of the motor shaft is positioned in the inner cavity of the hollow shaft, and the motor shaft is fixedly connected with the hollow shaft; the lower part of the motor shaft is connected with a transmission shaft through a coupler, and the transmission shaft sequentially penetrates through the pump base and the water raising pipe and is fixedly connected with the working part.
As a preferred example, the motor is fixedly connected with the connecting section through a motor face flange.
As a preferred example, the long-shaft deep-well pump further comprises a motor coupler, and the motor coupler is connected between the motor and the hollow shaft; the motor shaft is connected with the hollow shaft through a hook head key.
Preferably, the bearing comprises two thrust bearings and a roller bearing, the two thrust bearings are arranged up and down, and the roller bearing is positioned below the thrust bearings.
As a preferred example, the bearing further comprises a bearing upper cover and a bearing lower cover, and the thrust bearing and the roller bearing are positioned in the bearing seat by the bearing upper cover and the bearing lower cover through bolts; the thrust bearing and the roller bearing are separated by a bearing retainer ring and a bearing washer, and the thrust bearing and the roller bearing are locked at the rear end of the roller bearing by a locking ring and a locking nut.
As a preferred example, one end of the coil pipe is a water inlet end, and the other end of the coil pipe is a water outlet end; the water inlet end and the water outlet end are respectively provided with an elbow.
As a preferred example, a water pumping booster pump is arranged on the coil pipe, filter screens are arranged on the water inlet pipeline and the water outlet pipeline, and the water inlet end and the water outlet end of the coil pipe respectively extend out of the connecting section.
As a preferred example, the long-shaft deep-well pump further comprises a water tank and a cooling water circulator, wherein the water tank is used for containing cooling water, an outlet of the cooling water circulator is connected with a water inlet end elbow of the coil pipe, a water outlet end elbow of the coil pipe is connected with an inlet of the water tank, and an outlet of the water tank is connected with an inlet of the cooling water circulator.
Compared with the prior art, the utility model discloses a maintenance cost when can reduce to be used for bearing assembly and major axis deep-well pump of major axis deep-well pump has longer life. When the water pump runs, the thrust bearing bears the axial force of the pump, and the thrust bearing is immersed in lubricating oil, so that the friction loss of the bearing is reduced, and the friction heat is discharged. And a coil is arranged in the bearing seat, and self-circulation cooling is implemented by introducing circulating cooling water into the coil. Therefore, the cooling water is used for cooling the lubricating oil with the temperature increased during working, the service life of the bearing and the service cycle of the lubricating oil are prolonged, and the maintenance cost is reduced.
Drawings
Fig. 1 is a sectional view of a long-axis deep well pump according to an embodiment of the present invention.
Wherein: 1. a motor; 2. a backstop pin; 3. a motor coupling; 4. adjusting the nut; 5. a hook head key; 6. an elastomeric pintle body; 7. an upper bearing cover; 8. a motor face flange; 9. a lower bearing cover; 10. a coupling section; 11. a hollow shaft; 12. a thrust bearing; 13. a bearing seat; 14. a coil pipe; 15. a bearing retainer ring; 16. bending the pipe; 17. a bearing washer; 18. a roller bearing; 19. a locking ring; 20. locking the nut; 21. a pump mount; 22. a water raising pipe; 23. a drive shaft; 24. a coupling; 25. a bracket member; 26. a working member; 27. a water strainer member; 28. A motor shaft.
Detailed Description
The technical solution of the present invention will be described in detail with reference to the accompanying drawings.
The embodiment of the utility model provides a long axis deep-well pump is applied to well or rivers, lakes and seas, with the water extraction equipment on ground, is applicable to and carries with water extraction in cities and towns, industrial and mining enterprises, farmland irrigation that use groundwater as the water source.
As shown in fig. 1, the bearing assembly for long-shaft deep-well pump of the embodiment of the present invention includes a bearing seat 13, a bearing, and a coiled pipe 14. The bearing is located on the bearing seat 13. The bearing seat is provided with an annular groove. The coil 14 is located in the annular groove. When the bearing is used, lubricating oil is arranged in the annular groove and infiltrates the bearing.
In the bearing assembly of the above embodiment, the two ends of the coil pipe 14 extend out of the bearing seat 13, one end is a water inlet end, and the other end is a water outlet end. In the bearing assembly of the above embodiment, the housing has the coil 14 disposed therein. The introduction of cooling water into the coil 14 can provide cooling for the lubricating oil also located in the bearing assembly. When the bearing works, the generated heat can be transferred to the lubricating oil, so that the temperature of the lubricating oil is increased. If the temperature of the lubricating oil is too high, the viscosity of the lubricating oil is lowered, and an oil film is not easily formed. Therefore, the lubricating oil can not lubricate the bearing, the temperature of the lubricating oil is too high, the heat generated by the running of the bearing can not be taken away, and the bearing can be burnt after long-time running. Therefore, the coil 14 is arranged in the bearing seat, and the cooling water in the coil 14 is used for cooling the lubricating oil so as to prolong the service life of the lubricating oil.
As shown in fig. 1, the embodiment of the present invention further provides a long-shaft deep-well pump, which includes a motor 1 having a motor shaft 28, a coupling section 10, a hollow shaft 11, a pump base 21, a water lifting pipe 22, a transmission shaft 23, a working component 26, a strainer component 27, and a bearing component. The connecting section 10 is located between the motor 1 and the pump base 21, and the connecting section 10 is fixedly connected with the motor 1 and the pump base 21 respectively. The bearing assembly is positioned in the inner cavity of the coupling section 10, and the top end of the water raising pipe 22 is fixedly connected with the bottom end of the pump base 21. The working element 26 is positioned below the water lifting pipe 22, the water filter screen part 27 is positioned below the working element 26, and the water filter screen part 27 is positioned on the working element 26 and fixedly connected with the working element 26. The bearing assembly comprises a housing 13, bearings and a coil 14. The bearing is located on the bearing seat 13. The bearing blocks are provided with annular grooves in which the coil 14 is located. When the bearing is used, lubricating oil is arranged in the annular groove and infiltrates the bearing. The two ends of the coil pipe 14 extend out of the bearing seats 13. The bearing block 13 is fixedly connected to the coupling section 10. The bearing assembly is fixed on the outer circle of the hollow shaft 11. The motor 1 is connected with the hollow shaft 11 through the elastic pin injection body 6 to drive the hollow shaft 11 to rotate. The hollow shaft 11 is connected to the bearing seat 13 through a bearing assembly, the upper part of the motor shaft 28 is positioned in the inner cavity of the hollow shaft 11, and the motor shaft 28 is fixedly connected with the hollow shaft 11. The lower part of the motor shaft 28 is connected with the transmission shaft 23 through a coupler, and the transmission shaft 23 sequentially passes through the pump base 21 and the water raising pipe 22 and is fixedly connected with the working part 26.
In the long-shaft deep-well pump of the above embodiment, the number of the drive shafts 23 is determined by the depth of the working condition. When the number of the transmission shafts 23 is more than 1, the transmission shafts 23 are tightly connected by the coupling 24. The number of lift pipes 22 is determined by the depth of the working condition. When the number of the water raising pipes 22 is more than 2, the water raising pipes 22 are fixed by the mounting bracket parts 25 and fastened by bolts. Preferably, the adjusting nut 4 is mounted on the upper portion of the motor shaft 28 and is fixed to the upper portion of the hollow shaft 11 by a screw. The adjusting nut 4 serves to adjust the running clearance of the working member 26.
The long-axis deep-well pump of the above embodiment is placed in the water to be pumped. In operation, the motor 1 is started, and the motor shaft 28 drives the hollow shaft 11 to rotate. The bearings located outside the hollow shaft 11 receive the radial forces when the hollow shaft 11 is rotated. The bearing is soaked in lubricating oil. The heat generated by the rotation of the bearing is absorbed by the lubricating oil. The temperature of the lubricating oil increases. Through set up coil pipe 14 in the bearing frame, let in cooling water to coil pipe 14 in, cool off the cooling to the lubricating oil that the temperature rose to the life of extension lubricating oil. When the hollow shaft 11 rotates, the motor shaft 28 is driven to rotate, and the transmission shaft 23 connected with the motor shaft 28 also rotates. Since the working member 26 is connected to the transmission shaft 23, the working member 26 is also rotated. The working member 26 draws water, and the water is filtered by the strainer member 27, flows upward from the working member 26, passes through the water raising pipe 22, and finally flows out of the pump mount 21.
In the long-shaft deep-well pump of the above embodiment, the motor 1 is fixedly connected with the connecting section 10 through the motor face flange 8. The long-shaft deep well pump also comprises a motor coupler 3, and the motor coupler 3 is connected between the motor 1 and the hollow shaft 11; the motor shaft 28 is connected to the hollow shaft 11 via the hook key 5. Preferably, the long-shaft deep-well pump further comprises a check pin 2, and the check pin 2 is installed in a check hole of the hollow shaft 11 and plays a role of preventing the pump-stopping water pump from reversing.
In the long shaft deep well pump of the above embodiment, the bearings include two thrust bearings 12 and one roller bearing 18. Two thrust bearings 12 are arranged up and down, and a roller bearing 18 is positioned below the thrust bearings 12. The thrust bearing 12 and the roller bearing 18 function to prevent the drive shaft 23 from radially swinging. The bearing further comprises a bearing upper cover 7 and a bearing lower cover 9. The upper bearing cover 7 and the lower bearing cover 9 position the thrust bearing 12 and the roller bearing 18 in the bearing housing 13 by bolts. The thrust bearing 12 is separated from the roller bearing 18 by a bearing retainer 15 and a bearing washer 17, and the thrust bearing 12 and the roller bearing 18 are locked at the rear end of the roller bearing 18 by a locking ring 19 and a locking nut 20.
In the long-axis deep-well pump of the above embodiment, one end of the coiled pipe 14 is a water inlet end, and the other end is a water outlet end. In order to introduce cooling water into the coil 14, one scheme is as follows: the water suction pump is arranged on the coil pipe 14, the water inlet end and the water outlet end of the coil pipe 14 are respectively provided with a filter screen, and the water inlet end and the water outlet end of the coil pipe 14 respectively extend out of the connecting section 10. When the long-shaft deep-well pump is placed in water to be pumped, the water inlet end of the coil pipe 14 is connected to the water outlet pipeline of the pump, and the water outlet end of the coil pipe 14 extends into the pool. Therefore, when the long-shaft deep well pump works, the booster pump is started, and then water to be pumped enters from the water inlet end of the coil pipe 14 and flows out from the water outlet end. The structure makes full use of the existing water source, cools the high-temperature lubricating oil, and is simple in structure. The filter screen is arranged on the coil pipe and can filter sundries in water, so that the coil pipe 14 is prevented from being blocked. The other scheme is as follows: the long-shaft deep-well pump further comprises a water tank and a cooling water circulator, the water tank is used for containing cooling water, and the water inlet end and the water outlet end of the coil pipe 14 are respectively provided with an elbow 16. The outlet of the cooling water circulator is connected with the inlet elbow 16 of the coil 14, the outlet elbow 16 of the coil 14 is connected with the inlet of the water tank, and the outlet of the water tank is connected with the inlet of the cooling water circulator. The cooling water circulator cryogenically treats the cooling water so that the cryogenically cooled water enters the tank and passes into the coil 14. After the lubricating oil is cooled, the temperature of cooling water is increased, the cooling water is conveyed into a water tank and conveyed into a cooling water circulator through the water tank for cooling treatment, and the cooling water is recycled. For the second scheme, cooling water is introduced from an external self-circulation cooling system to implement self-circulation cooling, and the problems that the pumping medium has more sediment, the coil pipe is easy to block, and the pumping medium cannot be used for cooling are solved.
The utility model discloses in the long axis deep-well pump, thrust bearing 12 has let in the cooling water in the coil pipe 14 of installing in the bearing frame 13 inner chamber in the lubricating oil of bearing frame 13 immersion, gives the mechanical oil cooling, and the while is also rapid the temperature that has reduced thrust bearing 12, has guaranteed thrust bearing 12's lubrication and cooling.
The utility model discloses when the major axis deep-well pump operation, thrust bearing 12 bears the axial force of pump, and thrust bearing 12 immerses in lubricating oil, reduces bearing wear, the frictional heat of discharge. Meanwhile, the coil pipe 14 which is filled with circulating cooling water is arranged in the lubricating oil, so that the temperature of the lubricating oil with increased temperature is reduced, the service life of the bearing and the service life of the lubricating oil are prolonged, and the maintenance cost is reduced.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration only, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the claims and their equivalents.
Claims (10)
1. A bearing assembly for a long shaft deep well pump, characterized in that the bearing assembly comprises a bearing seat (13), a bearing and a coil (14), the bearing is located on the bearing seat (13), the bearing seat is provided with an annular groove, and the coil (14) is located in the annular groove; when the bearing is used, lubricating oil is arranged in the annular groove and infiltrates the bearing.
2. Bearing assembly for a deep well pump with a long shaft according to claim 1, characterised in that the coil (14) extends with bearing blocks (13) at both ends, one end being the water inlet end and the other end being the water outlet end.
3. A long-shaft deep-well pump comprising a bearing assembly according to claim 1, characterized in that the long-shaft deep-well pump comprises a motor (1) comprising a motor shaft (28), a coupling section (10), a hollow shaft (11), a pump base (21), a lifting pipe (22), a transmission shaft (23), a working part (26), a strainer part (27) and a bearing assembly; wherein,
the connecting section (10) is positioned between the motor (1) and the pump seat (21), and the connecting section (10) is respectively and fixedly connected with the motor (1) and the pump seat (21); the bearing assembly is positioned in the inner cavity of the connecting section (10), and the top end of the water raising pipe (22) is fixedly connected with the bottom end of the pump base (21); the working part (26) is positioned below the water lifting pipe (22), the water filter screen part (27) is positioned below the working part (26), and the water filter screen part (27) is fixedly connected with the working part (26);
the bearing assembly comprises a bearing seat (13), a bearing and a coil pipe (14), the bearing is positioned on the bearing seat (13), the bearing seat is provided with an annular groove, and the coil pipe (14) is positioned in the annular groove; when in use, lubricating oil is arranged in the annular groove and infiltrates the bearing; two ends of the coil pipe (14) extend out of the bearing seats (13); the bearing seat (13) is fixedly connected with the connecting section (10); the bearing assembly is fixed on the excircle of the hollow shaft (11);
the motor (1) is connected with the hollow shaft (11) through the elastic pin injection body (6) to drive the hollow shaft (11) to rotate; the hollow shaft (11) is connected to the bearing seat (13) through a bearing assembly, the upper part of the motor shaft (28) is positioned in the inner cavity of the hollow shaft (11), and the motor shaft (28) is fixedly connected with the hollow shaft (11); the lower part of a motor shaft (28) is connected with a transmission shaft (23) through a coupler, and the transmission shaft (23) sequentially penetrates through a pump base (21) and a water raising pipe (22) and is fixedly connected with a working part (26).
4. Deep well pump according to claim 3, characterised in that the motor (1) is fixedly connected to the coupling section (10) via a motor face flange (8).
5. The long-shaft deep-well pump according to claim 3, further comprising a motor coupling (3), the motor coupling (3) being connected between the motor (1) and the hollow shaft (11); the motor shaft (28) is connected with the hollow shaft (11) through a hook key (5).
6. Deep well pump according to claim 3, characterized in that the bearings comprise two thrust bearings (12) and a roller bearing (18), the two thrust bearings (12) being arranged one above the other, the roller bearing (18) being located below the thrust bearings (12).
7. The long shaft deep well pump according to claim 6, wherein the bearing further comprises a bearing upper cover (7) and a bearing lower cover (9), the bearing upper cover (7) and the bearing lower cover (9) positioning the thrust bearing (12) and the roller bearing (18) in the bearing housing (13) by bolts; the thrust bearing (12) and the roller bearing (18) are separated by a bearing retainer ring (15) and a bearing washer (17), and the thrust bearing (12) and the roller bearing (18) are locked at the rear end of the roller bearing (18) by a locking ring (19) and a locking nut (20).
8. Long shaft deep well pump according to claim 7, characterized in that said coiled tubing (14) has a water inlet end at one end and a water outlet end at the other end.
9. The long-shaft deep-well pump according to claim 8, characterized in that a water pumping booster pump is arranged on the coil pipe (14), filter screens are arranged on the water inlet pipeline and the water outlet pipeline, and the water inlet end and the water outlet end of the coil pipe (14) respectively extend out of the connecting section (10).
10. The long shaft deep well pump according to claim 8, further comprising a water tank for containing cooling water and a cooling water circulator, wherein the water inlet end and the water outlet end of the coil pipe (14) are respectively provided with an elbow (16); the outlet of the cooling water circulator is connected with the water inlet end elbow (16) of the coil pipe (14), the water outlet end elbow (16) of the coil pipe (14) is connected with the inlet of the water tank, and the outlet of the water tank is connected with the inlet of the cooling water circulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721824079.5U CN207673601U (en) | 2017-12-22 | 2017-12-22 | A kind of bearing assembly and borehole shaft driven (centrifugal) pump for borehole shaft driven (centrifugal) pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721824079.5U CN207673601U (en) | 2017-12-22 | 2017-12-22 | A kind of bearing assembly and borehole shaft driven (centrifugal) pump for borehole shaft driven (centrifugal) pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207673601U true CN207673601U (en) | 2018-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721824079.5U Active CN207673601U (en) | 2017-12-22 | 2017-12-22 | A kind of bearing assembly and borehole shaft driven (centrifugal) pump for borehole shaft driven (centrifugal) pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207673601U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107956733A (en) * | 2017-12-22 | 2018-04-24 | 蓝深集团股份有限公司 | A kind of bearing assembly and borehole shaft driven (centrifugal) pump for borehole shaft driven (centrifugal) pump |
-
2017
- 2017-12-22 CN CN201721824079.5U patent/CN207673601U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107956733A (en) * | 2017-12-22 | 2018-04-24 | 蓝深集团股份有限公司 | A kind of bearing assembly and borehole shaft driven (centrifugal) pump for borehole shaft driven (centrifugal) pump |
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