Multi-stage centrifugal pump structure
By adopting central support and splash lubrication design in multi-stage centrifugal pumps, the problem of unstable operation of multi-stage centrifugal pumps in high temperature environments is solved, and the stability and adaptability of the equipment are improved at high temperatures.
Patent Information
- Application Number
- CN202422497520.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-16
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-10-16
AI Technical Summary
The existing multi-stage centrifugal pumps operate unstable under higher temperature environments, which affects the stability and adaptability of the equipment.
The suction section and discharge section are supported by the central support method, and the structures such as lever bolts, lever nuts, lever gaskets are installed on the pump shaft. Combined with the bearing box with a large amount of oil storage and the oil-swing ring for splash lubrication, enhance the lubrication effect of the bearing and use a heat dissipation pipe device for heat dissipation.
It effectively avoids the operating gap caused by equipment expansion at high temperatures, enhances the operating stability and life of the equipment in a high temperature environment, reduces friction heat, and improves the adaptability and operation efficiency of the equipment.
Smart Images
Figure CN223062656U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of multistage centrifugal pumps, in particular to a structure of a multistage centrifugal pump. Background Art
[0002] With the rapid development of modern industry, the requirements for fluid transportation are constantly increasing. In many fields, such as petrochemical, electric power, metallurgy, mining, etc., a large amount of liquid needs to be transported from one place to another, and often requires high pressure and large flow rate. Multistage centrifugal pumps have become key equipment to meet these needs because they can achieve high-lift and large-flow transportation within a relatively small volume.
[0003] A multistage centrifugal pump mainly consists of a stator, a rotor and auxiliary devices. When operating, the liquid to be transported enters the suction port of the pump under a given pressure. Due to the action of the impeller, both the kinetic energy and potential energy of the liquid increase. After the liquid enters the guide vane, part of the kinetic energy is converted into potential energy, and the reverse blades of the guide vane transport the liquid to the inlet of the next-stage impeller under favorable hydraulic characteristics. Due to the repetition of this process from one stage to another, the same pressure is increased at each stage. After passing through the last-stage guide vane, the fluid enters the annular chamber of the cylinder body and enters the discharge pipeline through the discharge port.
[0004] Existing multistage centrifugal pumps produced can achieve the function of high-lift transportation, but they cannot operate under high-temperature conditions, which limits the operating environment of the equipment, reduces the stability of equipment operation and the adaptability to the environment. Therefore, a structure of a multistage centrifugal pump is proposed to solve the above problems. Summary of the Utility Model
[0005] In order to make up for the above deficiencies, the utility model provides a structure of a multistage centrifugal pump, aiming to improve the problems in the prior art that it cannot operate in a high-temperature environment, reducing the stability and adaptability of the equipment.
[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:
[0007] A structure of a multistage centrifugal pump includes a pump shaft. A non-drive-end bearing housing, a non-drive-end seal housing, a drive-end seal housing and a drive-end bearing housing are installed on the outer side of the pump shaft. A discharge section is installed on the side of the non-drive-end seal housing, and a suction section is installed on the side of the drive-end seal housing. The support methods of the suction section and the discharge section adopt central support. Through bolts, through washers and through nuts are installed in the middle of the suction section and the discharge section. A balance drum, a balance drum sleeve, a balance drum snap ring and a balance drum pressing ring are installed inside the discharge section. A plug is installed at the bottom of the suction section. A multi-stage middle section assembly is installed between the suction section and the discharge section to increase the flow pressure of the internal fluid;
[0008] As a further description of the above technical solution:
[0009] The multi-stage middle section assembly includes a plurality of middle sections. The plurality of middle sections are installed between the suction section and the discharge section. O-rings are installed between every two of the plurality of middle sections. Middle section wearing rings are installed on the inner sides of the plurality of middle sections. A first-stage impeller is installed inside the first-stage middle section. A last-stage diffuser is installed inside the last-stage middle section. Diffusers and impellers are installed inside the remaining middle sections. Diffuser wearing rings are installed inside both the last-stage diffuser and the diffusers.
[0010] As a further description of the above technical solution:
[0011] A bearing support connection section is installed between the non-drive end bearing housing and the non-drive end seal housing. A bearing support connection section is installed between the drive end seal housing and the drive end bearing housing. Mechanical seals are installed inside both of the two bearing support connection sections, the non-drive end seal housing, and the drive end seal housing. Cooling cavity covers are installed inside both the non-drive end seal housing and the drive end seal housing. A monofilament joint, a hex nut, and a hex bolt are installed at the bottoms of the two bearing support connection sections.
[0012] As a further description of the above technical solution:
[0013] A tapered roller bearing, a non-drive end oil slinger sleeve, and an oil slinger are installed inside the non-drive end bearing housing. A non-drive end baffle, an oil and gas separator, and a lifting eye bolt are installed on the side of the non-drive end bearing housing. Socket head cap screws are installed inside the non-drive end seal housing.
[0014] As a further description of the above technical solution:
[0015] A cylindrical roller bearing, a drive end oil slinger sleeve, and an oil slinger are installed inside the drive end bearing housing. A drive end baffle is installed on the side of the drive end bearing housing.
[0016] As a further description of the above technical solution:
[0017] A suction section wearing ring is installed inside the suction section. A balance pipe device is installed on the outer periphery of the pump shaft. A flat key two is installed on the side of the balance pipe device. Constant level oil cups and oil gauges are installed on both sides of the drive end bearing housing and the non-drive end bearing housing. A non-drive end bearing adjusting ring and an oil baffle are installed inside the non-drive end bearing housing.
[0018] As a further description of the above technical solution:
[0019] The driving end bearing housing and the non-driving end bearing housing are internally installed with a heat dissipation pipe device. A non-driving end bearing gland is installed on the side of the non-driving end bearing housing. A fan and a fan cover are installed on the outside of the non-driving end bearing gland. A flat key one and a shaft retaining ring are installed on the side of the fan.
[0020] As a further description of the above technical solution:
[0021] A valve and a flange are installed at the bottom of the discharge section for controlling and quickly connecting to other devices.
[0022] The utility model has the following beneficial effects:
[0023] 1. In the utility model, with the cooperation of the through bolts, through nuts, through washers, suction section, discharge section and middle section, corresponding pre-tightening force is given inside. Using the center support method to replace the base support method to support the suction section and the discharge section can effectively avoid the device being restricted when heated and expanded, ensure the operation clearance inside the pump, and enhance the stability of the equipment operation in a high-temperature environment.
[0024] 2. In the utility model, the driving end bearing housing and the non-driving end bearing housing have a large internal space, increasing the oil storage capacity. The installed oil slinger rotates with the pump shaft for splash lubrication, effectively reducing the frictional heat, improving the bearing working state, and prolonging the equipment life. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 It is a schematic cross-sectional view of the device body of a multi-stage centrifugal pump structure proposed by the utility model;
[0026] Figure 2 For Figure 1 The enlarged view at A in;
[0027] Figure 3 For Figure 1 The enlarged view at B in;
[0028] Figure 4 For Figure 1 The structural schematic diagram in the C direction of;
[0029] Figure 5 For Figure 1 The structural schematic diagram in the D direction of.
[0030] LEGEND DESCRIPTION:
[0031] 1. Fan cover; 2. Flat key 1; 3. Shaft circlip; 4. Fan; 5. Non-drive end bearing housing; 6. Non-drive end bearing gland; 7. Oil-gas separator; 8. Tapered roller bearing; 9. Pump shaft; 10. Non-drive end bearing adjusting ring; 11. Oil baffle; 12. Lifting ring screw; 13. Bearing support connection section; 14. Mechanical seal; 15. Non-drive end seal housing; 16. Hexagon socket head cap screw; 17. Final stage guide vane; 18. Discharge section; 19. Through bolt; 20. Middle section; 21. O-ring; 22. Guide vane; 23. Impeller; 24. First stage impeller; 25. Suction section orifice ring; 26. Suction section; 27. Through bolt gasket; 28. Through bolt nut; 29. Drive end seal housing; 30. Cooling cavity cover; 31. Cylindrical roller bearing; 32. Drive end bearing housing; 33. Drive end oil slinger sleeve; 34. Oil slinger; 35. Drive end baffle plate; 36. Hexagon nut; 37. Hexagon bolt; 38. Monofilament joint; 39. Plug; 40. Flat key 2; 41. Guide vane orifice ring; 42. Middle section orifice ring; 43. Balance pipe device; 44. Balance drum; 45. Balance drum sleeve; 46. Balance drum snap ring; 47. Balance drum pressure ring; 48. Valve; 49. Flange; 50. Non-drive end oil slinger sleeve; 51. Non-drive end baffle plate; 52. Constant level oil cup; 53. Oil level gauge; 54. Heat dissipation pipe device. Detailed implementation manners
[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0033] Refer to Figures 1-3, an embodiment provided by the present utility model: a multi-stage centrifugal pump structure, including a pump shaft 9. Outside the pump shaft 9, a non-drive end bearing housing 5, a non-drive end seal housing 15, a drive end seal housing 29, and a drive end bearing housing 32 are installed to protect the internal structure of the housing and prevent damage. A discharge section 18 is installed on the side of the non-drive end seal housing 15, and a suction section 26 is installed on the side of the drive end seal housing 29. Fluid enters the device from the suction section 26 and flows out from the discharge section 18 after being centrifugally pressurized. The support methods of the suction section 26 and the discharge section 18 adopt central support, so that the device can expand unrestrictedly in all directions when heated, effectively ensuring the operating clearance inside the pump. A through-bolt 19, a through-bolt gasket 27, and a through-bolt nut 28 are installed in the middle of the suction section 26 and the discharge section 18. Inside the discharge section 18, a balance drum 44, a balance drum sleeve 45, a balance drum snap ring 46, and a balance drum pressure ring 47 are installed. The above-mentioned structures for balancing can reduce the radial force during pump operation, reduce the vibration and noise of the pump, and improve the stability and efficiency of the pump. A plug 39 is installed at the bottom of the suction section 26 to seal the suction section 26 and prevent leakage. A multi-stage intermediate section assembly is installed between the suction section 26 and the discharge section 18 to increase the flow pressure of the internal fluid. The multi-stage intermediate section assembly includes a plurality of intermediate sections 20. The plurality of intermediate sections 20 are installed between the suction section 26 and the discharge section 18. An O-ring 21 is installed between every two of the plurality of intermediate sections 20. A middle section orifice ring 42 is installed inside each of the plurality of intermediate sections 20. The O-ring 21 and the middle section orifice ring 42 are used to seal the position between two intermediate sections 20 to maintain the airtightness of the environment. A first-stage impeller 24 is installed inside the first-stage intermediate section 20, a last-stage diffuser 17 is installed inside the last-stage intermediate section 20, and diffusers 22 and impellers 23 are installed inside the remaining intermediate sections 20. Diffuser orifice rings 41 are installed inside both the last-stage diffuser 17 and the diffusers 22. Fluid enters the device from the suction section 26, and the kinetic energy and potential energy of the fluid are increased by the first-stage impeller 24. The fluid enters the diffuser 22, and a part of the kinetic energy is converted into potential energy. Then, the fluid is transported to the inlet of the next-stage impeller 24 through the anti-blades of the diffuser 22, and the internal fluid is pressurized repeatedly to achieve the function of high head.
[0034] Refer to Figures 1-3, a bearing support connection section 13 is installed between the non-drive end bearing housing 5 and the non-drive end seal housing 15, and a bearing support connection section 13 is installed between the drive end seal housing 29 and the drive end bearing housing 32. Mechanical seals 14 are installed inside the two bearing support connection sections 13, the non-drive end seal housing 15, and the drive end seal housing 29. The bearing support connection section 13 is used to connect the seal housing and the bearing housing, and then the mechanical seal 14 is used to maintain the sealing performance inside the housing. Cooling cavity covers 30 are installed inside the non-drive end seal housing 15 and the drive end seal housing 29, and the cooling cavity covers 30 are used to cool the structures inside the housing to maintain the stability of the equipment operation. Monofilament connectors 38, hex nuts 36, and hex bolts 37 are installed at the bottom of the two bearing support connection sections 13. A non-drive end baffle 51, an oil-gas separator 7, and a lifting eye screw 12 are installed on the side of the non-drive end bearing housing 5. An internal hexagon cylinder screw 16 is installed inside the non-drive end seal housing 15. A tapered roller bearing 8, a non-drive end oil slinger sleeve 50, and an oil slinger 34 are installed inside the non-drive end bearing housing 5. When the pump shaft 9 rotates, the oil slinger 34 rotates together to achieve the function of splash lubrication inside the device. A drive end baffle 35 is installed on the side of the drive end bearing housing 32. A cylindrical roller bearing 31, a drive end oil slinger sleeve 33, and an oil slinger 34 are installed inside the drive end bearing housing 32. The drive end oil slinger sleeve 33 and an oil slinger 34 are used to cooperate with the rotation of the pump shaft 9 to splash-lubricate the inside of the device.
[0035] Refer to Figures 1-5 , an inlet section ring 25 is installed inside the suction section 26. A balance pipe device 43 is installed on the outer circumference of the pump shaft 9. A flat key two 40 is installed on the side of the balance pipe device 43. Constant level oil cups 52 and oil gauges 53 are installed on both sides of the drive end bearing housing 32 and the non-drive end bearing housing 5. The constant level oil cups 52 and the oil gauges 53 can keep the lubricating oil inside the bearing housing at a set constant position all the time and observe the height of the oil level inside the housing at the same time. A non-drive end bearing adjusting ring 10 and an oil retaining disc 11 are installed inside the non-drive end bearing housing 5. Heat dissipation pipe devices 54 are installed inside the drive end bearing housing 32 and the non-drive end bearing housing 5 to dissipate heat from the device and maintain the stability of the device operation state. A non-drive end bearing gland 6 is installed on the side of the non-drive end bearing housing 5. A fan 4 and a fan cover 1 are installed on the outside of the non-drive end bearing gland 6. A flat key one 2 and a shaft circlip 3 are installed on the side of the fan 4. The fan 4 is used to dissipate heat from the inside of the housing to maintain the stability of the operation. A valve 48 and a flange 49 are installed at the bottom of the discharge section 18 for controlling and quickly connecting to other equipment.
[0036] Working principle: During use, corresponding pre-tightening forces are applied through the through-bar bolts 19, through-bar nuts 28, through-bar gaskets 27, suction section 26, discharge section 18 and middle section 20, and sealed by the O-ring 21 to prevent the pumped medium from leaking to the outside. The support methods of the suction section 26 and the discharge section 18 both adopt central support, which can effectively avoid phenomena such as the reduction of the internal operation clearance of the pump and the interference of the internal parts of the pump after thermal expansion caused by the foundation support. The drive-end bearing housing 32 and the non-drive-end bearing housing 5 have large oil storage spaces, and splash lubrication is formed by the oil slinger 34 installed inside when rotating with the pump shaft 9. A heat dissipation pipe device 54 can also be installed in the oil chamber. This structure can lubricate the cylindrical roller bearings 31 and tapered roller bearings 8 of the pump better and adapt to high-temperature working conditions.
[0037] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A multi-stage centrifugal pump structure, comprising a pump shaft (9), characterized in that: An outer side of the pump shaft (9) is provided with a non-drive end bearing housing (5), a non-drive end seal housing (15), a drive end seal housing (29), and a drive end bearing housing (32). A discharge section (18) is mounted on a side surface of the non-drive end seal housing (15), and a suction section (26) is mounted on a side surface of the drive end seal housing (29). The suction section (26) and the discharge section (18) are supported in a central support manner. A through-bolt (19), a through-bolt gasket (27), and a through-bolt nut (28) are mounted in a middle part of the suction section (26) and the discharge section (18). A balance drum (44), a balance drum sleeve (45), a balance drum snap ring (46), and a balance drum retaining ring (47) are mounted inside the discharge section (18). A plug (39) is mounted at a bottom of the suction section (26). A multi-stage middle section assembly is mounted between the suction section (26) and the discharge section (18) for increasing a flow pressure of internal fluid.
2. The structure of a multi-stage centrifugal pump according to claim 1, characterized in that: The multi-stage middle section assembly includes a plurality of middle sections (20). The plurality of middle sections (20) are mounted between the suction section (26) and the discharge section (18). An O-ring (21) is mounted between every two of the plurality of middle sections (20). A middle section wearing ring (42) is mounted inside each of the plurality of middle sections (20). A first-stage impeller (24) is mounted inside a first-stage middle section (20). A last-stage diffuser (17) is mounted inside a last-stage middle section (20). A diffuser (22) and an impeller (23) are mounted inside the remaining middle sections (20). A diffuser wearing ring (41) is mounted inside each of the last-stage diffuser (17) and the diffuser (22).
3. The structure of a multi-stage centrifugal pump according to claim 1, characterized in that: A bearing bracket connection section (13) is mounted between the non-drive end bearing housing (5) and the non-drive end seal housing (15). A bearing bracket connection section (13) is mounted between the drive end seal housing (29) and the drive end bearing housing (32). A mechanical seal (14) is mounted inside each of the two bearing bracket connection sections (13), the non-drive end seal housing (15), and the drive end seal housing (29). A cooling cavity cover (30) is mounted inside each of the non-drive end seal housing (15) and the drive end seal housing (29). A single-wire joint (38), a hexagon nut (36), and a hexagon bolt (37) are mounted at a bottom of each of the two bearing bracket connection sections (13).
4. A multi-stage centrifugal pump structure according to claim 3, characterized in that: A tapered roller bearing (8), a non-drive end oil slinger sleeve (50), and an oil slinger (34) are mounted inside the non-drive end bearing housing (5). A non-drive end baffle (51), an oil-gas separator (7), and a lifting eye screw (12) are mounted on a side surface of the non-drive end bearing housing (5). An internal hexagonal cylinder screw (16) is mounted inside the non-drive end seal housing (15).
5. The structure of a multistage centrifugal pump according to claim 3, characterized in that: Inside the drive end bearing housing (32), a cylindrical roller bearing (31), a drive end oil slinger sleeve (33) and an oil slinger (34) are installed. On the side of the drive end bearing housing (32), a drive end baffle plate (35) is installed.
6. A multi-stage centrifugal pump structure according to claim 1, characterized in that: Inside the suction section (26), a suction section gland (25) is installed. On the outer periphery of the pump shaft (9), a balance pipe device (43) is installed. On the side of the balance pipe device (43), a flat key two (40) is installed. On both sides of the drive end bearing housing (32) and the non-drive end bearing housing (5), constant level oil cups (52) and oil level gauges (53) are installed. Inside the non-drive end bearing housing (5), a non-drive end bearing adjusting ring (10) and an oil retaining disc (11) are installed.
7. A multi-stage centrifugal pump structure according to claim 1, characterized in that: Inside the drive end bearing housing (32) and the non-drive end bearing housing (5), a heat dissipation pipe device (54) is installed. On the side of the non-drive end bearing housing (5), a non-drive end bearing gland (6) is installed. On the outside of the non-drive end bearing gland (6), a fan (4) and a fan cover (1) are installed. On the side of the fan (4), a flat key one (2) and a shaft snap ring (3) are installed.
8. A multi-stage centrifugal pump structure according to claim 1, characterized in that: At the bottom of the discharge section (18), a valve (48) and a flange (49) are installed for controlling and quickly connecting to other equipment.