Double-inlet self-balancing multi-stage sectional centrifugal pump device
By adopting a self-balancing design of back-to-back arrangement of impellers in the centrifugal pump, combined with radial and thrust bearing support, the high failure rate and high cost problems caused by balancing water pipes in the prior art are solved, and the self-balancing effect of efficient and low leakage is achieved.
Patent Information
- Application Number
- CN202422548262.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-10-22
AI Technical Summary
When used, in order to ensure balance, the balancing water pipe and balance mechanism are required to be used, resulting in high failure rate and increased costs.
The double-inlet self-balancing multi-stage segment centrifugal pump device is adopted, and the impeller is set back to back. By self-balancing the axial force of hydraulic power, the balanced water pipe and balance mechanism are cancelled, and radial bearings and thrust bearings are used for support. Combined with mechanical sealing, the sealing and stability are improved.
It realizes self-balancing without balancing the water pipes and mechanisms, reduces failure rate and cost, improves efficiency and seal service life, and reduces leakage risk.
Smart Images
Figure CN223120175U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of centrifugal pumps, and particularly relates to a double-inlet self-balancing multi-stage sectional centrifugal pump device. Background Technique
[0002] The centrifugal water pump is simply called a centrifugal pump, also known as a centrifugal water pump. It is a pumping machine that utilizes the centrifugal motion of water. Before starting, the pump should be filled with water first. After starting, the rotating impeller drives the water in the pump to rotate at a high speed. The water makes a centrifugal motion, is thrown outwards and is pressed into the outlet pipe. After the water is thrown out, the pressure near the impeller decreases, and a low-pressure area is formed near the rotating shaft. The pressure here is much lower than the atmospheric pressure, and the water outside rushes open the bottom valve and enters the pump from the inlet pipe under the action of the atmospheric pressure. The water that rushes in is thrown out again during the high-speed rotation with the impeller and is pressed into the outlet pipe. The impeller rotates continuously at a high speed driven by the power machine, and the water is continuously pumped from a low place to a high place. When the centrifugal pump is in use, in order to ensure the balance of the centrifugal pump, generally, a balance water pipe and a balance mechanism are used to keep the centrifugal pump balanced, which not only has a high failure rate but also increases the cost. Content of the Utility Model
[0003] Aiming at the problems in the prior art, the utility model provides a double-inlet self-balancing multi-stage sectional centrifugal pump device.
[0004] The technical solution adopted by the utility model to solve its technical problems is a double-inlet self-balancing multi-stage sectional centrifugal pump device, which includes a suction section, a discharge section, a middle section, a guide vane, an impeller, a pump shaft, a stuffing box, a mechanical seal, a thrust bearing, a radial bearing, and a bearing bracket. The suction section forms multiple spaces with the middle section, the guide vane, and the discharge section to place the impellers. There are two impellers, and the two impellers are arranged back to back. The suction section, the middle section, and the discharge section are connected by tie rods, and tie rod nuts are provided on the tie rods. The impeller is connected to the pump shaft. The middle section is connected to the suction section. The suction section is provided with a suction port and pump feet. There are two suction ports. The middle section is connected to the discharge section. The discharge section is provided with a discharge port and pump feet. The pump shaft is radially supported by radial bearings and axially supported by a thrust bearing. The pump shaft and the suction section are sealed by a mechanical seal. The pump shaft is provided with a first key, a second key, a double-stage impeller, a snap ring, a shaft sleeve, a throat lining, and an oil seal ring.
[0005] By adopting the above technical solution, the impellers are arranged back to back, the hydraulic axial force is self-balanced, there is no need for a balance water pipe and a balance mechanism for balancing, the pump has small losses, high efficiency, low pressure in the mechanical seal cavity, improves the service life of the mechanical seal, removes the complex balance mechanism, reduces the failure rate, saves costs, and the sealing part is a low-pressure area, which can reduce the leakage risk.
[0006] Specifically, the suction port can be to the left, to the right, or upwards.
[0007] By adopting the above technical solution, the suction port with an appropriate orientation can be selected according to the situation, which increases the applicable range.
[0008] Specifically, the discharge port can be to the left, to the right or upward.
[0009] By adopting the above technical solution, the discharge port can be to the left, to the right or upward, which is beneficial to adapting to different environments.
[0010] Specifically, a bearing end cover is fixed on one of the radial bearings, and a bearing cover is fixed on the other radial bearing.
[0011] By adopting the above technical solution, the arrangement of the bearing end cover and the bearing cover can protect the radial bearings.
[0012] Specifically, the stuffing box includes a middle stuffing box, an impeller stuffing box, a diffuser stuffing box and a hub stuffing box.
[0013] By adopting the above technical solution, the arrangement of the middle stuffing box, the impeller stuffing box, the diffuser stuffing box and the hub stuffing box improves the sealing performance.
[0014] Specifically, a bearing body and a bearing bracket are provided between the two radial bearings.
[0015] Advantages of the present utility model:
[0016] (1) For the double-inlet self-balancing multi-stage sectional centrifugal pump device of the present utility model, the impellers are arranged back to back, and the hydraulic axial force is self-balanced. There is no need for a balance water pipe and a balance mechanism for balancing. The pump has small losses, high efficiency, low pressure in the mechanical seal cavity, which improves the service life of the mechanical seal. The complex balance mechanism is removed, the failure rate is reduced, the cost is saved, and the sealing part is a low-pressure area, which can reduce the leakage risk.
[0017] (2) For the double-inlet self-balancing multi-stage sectional centrifugal pump device of the present utility model, the arrangement of the middle stuffing box, the impeller stuffing box, the diffuser stuffing box and the hub stuffing box improves the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The present utility model will be further described below with reference to the drawings and embodiments.
[0019] Figure 1 It is a sectional view of the present utility model.
[0020] In the figure: 1. Bearing end cover; 2. Thrust bearing; 3. Bearing body; 4. Bearing bracket; 5. Mechanical seal; 6. Suction section; 7. Impeller; 8. Guide vane; 9. Middle section; 10. First key; 11. Double-suction impeller; 12. Discharge section; 13. Snap ring; 14. Middle-section orifice ring; 15. Impeller orifice ring; 16. Guide-vane orifice ring; 17. Hub orifice ring; 18. Second key; 19. Sleeve; 20. Throat lining; 21. Tie-rod nut; 22. Tie-rod; 23. Pump shaft; 24. Oil seal ring; 25. Radial bearing; 26. Bearing cover. Specific embodiments
[0021] In order to make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the present utility model will be further described below in conjunction with specific embodiments.
[0022] In order to reduce the failure rate and save costs, as an embodiment of the present utility model, as Figure 1 shown, a double-inlet self-balancing multi-stage sectional centrifugal pump device described in the present utility model includes a suction section 6, a discharge section 12, a middle section 9, a guide vane 8, an impeller 7, a pump shaft 23, an orifice ring, a mechanical seal 5, a thrust bearing 2, a radial bearing 25, and a bearing bracket 4. The suction section 6 forms multiple spaces with the middle section 9, the guide vane 8, and the discharge section 12 to place the impeller 7. There are two impellers 7, and the two impellers 7 are arranged back to back. The suction section 6, the middle section 9, and the discharge section 12 are connected by a tie-rod 22, and a tie-rod nut 21 is provided on the tie-rod 22. The impeller 7 is connected to the pump shaft 23. The middle section 9 is connected to the suction section 6. The suction section 6 is provided with a suction port and pump feet. There are two suction ports. The middle section 9 is connected to the discharge section 12. The discharge section 12 is provided with a discharge port and pump feet. The pump shaft 23 is radially supported by 2 radial bearings 25, and axially by the thrust bearing 2. The pump shaft 23 and the suction section 6 are sealed by a mechanical seal 5. The pump shaft 23 is provided with a first key 10, a second key 18, a double-stage impeller 11, a snap ring 13, a sleeve 19, a throat lining 20, and an oil seal ring 24.
[0023] During use, the pump shaft 23 is connected to an external driving mechanism, and the driving mechanism drives the pump shaft 23 to rotate. Since the two impellers 7 are arranged back to back, the hydraulic axial force is self-balanced, and there is no need for a balance water pipe and a balance mechanism for balancing. The pump has low losses, high efficiency, low pressure in the mechanical seal cavity, improves the service life of the mechanical seal, removes the complex balance mechanism, reduces the failure rate, saves costs, and the sealing part is a low-pressure area, which can reduce the leakage risk.
[0024] In order to adapt to different use environments, the suction port can be to the left, to the right, or upward.
[0025] In order to adapt to different use environments, the discharge port can be to the left, to the right, or upward.
[0026] For the protection of the radial bearing 25, exemplarily, as Figure 1 shown, a bearing end cover 1 is fixed to one of the radial bearings 25 by bolts, and a bearing cover 26 is fixed to the other radial bearing 25 by bolts.
[0027] To improve the sealing performance, exemplarily, as Figure 1 shown, the gland includes a middle gland 14, an impeller gland 15, a diffuser gland 16, and a hub gland 17.
[0028] To improve the stability, exemplarily, as Figure 1 shown, a bearing body 3 and a bearing bracket 4 are provided between the two radial bearings 25.
[0029] When the utility model is in use, the pump feet are placed on the ground, and the pump feet can support the centrifugal pump. The suction port can be arranged to the left, right, or upward, and the discharge port can be arranged to the left, right, or upward. The suction port and the discharge port with appropriate orientations are selected according to the situation;
[0030] The pump shaft 23 is connected to an external driving mechanism, and the driving mechanism drives the pump shaft 23 to rotate. Since the two impellers 7 are arranged back to back, the hydraulic axial force is self-balanced, and there is no need for a balance water pipe and a balance mechanism for balancing. The pump has low loss, high efficiency, low pressure in the mechanical seal cavity, which improves the service life of the mechanical seal. The complex balance mechanism is removed, the failure rate is reduced, the cost is saved, and the sealing part is a low-pressure area, which can reduce the leakage risk.
[0031] The above shows and describes the basic principles, main features, and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of protection required by the present utility model. The scope of protection required by the present utility model is defined by the appended claims and their equivalents. The content not described in detail in the present utility model belongs to the prior art well-known to those skilled in the art.
Claims
1. A double-inlet self-balancing multi-stage segmented centrifugal pump device, characterized in that, It includes a suction section (6), a discharge section (12), a middle section (9), guide vanes (8), an impeller (7), a pump shaft (23), wearing rings, a mechanical seal (5), a thrust bearing (2), a radial bearing (25), and a bearing bracket (4). The suction section (6), the middle section (9), the guide vanes (8), and the discharge section (12) form multiple spaces for placing the impeller (7). There are two impellers (7) arranged back to back. The suction section (6), the middle section (9), and the discharge section (12) are connected by tie rods (22), and tie rod nuts (21) are provided on the tie rods (22). The impeller (7) is connected to the pump shaft (23). The middle section (9) is connected to the suction section (6). The suction section (6) is provided with a suction port and pump feet. There are two suction ports. The middle section (9) is connected to the discharge section (12), and the discharge section (12) is provided with a discharge port and pump feet. The pump shaft (23) is radially supported by 2 radial bearings (25) and axially by the thrust bearing (2). The pump shaft (23) and the suction section (6) are sealed by a mechanical seal (5). A first key (10), a second key (18), a two-stage impeller (11), a snap ring (13), a shaft sleeve (19), a throat lining (20), and an oil seal ring (24) are provided on the pump shaft (23).
2. The double-inlet self-balancing multi-stage segmented centrifugal pump device according to claim 1, wherein, The suction port can face left, right, or upward.
3. A double-inlet self-balancing multi-stage sectional centrifugal pump device according to claim 1, characterized in that, The discharge port can face left, right, or upward.
4. A double-inlet self-balancing multi-stage sectional centrifugal pump device according to claim 1, characterized in that, A bearing end cover (1) is fixed on one of the radial bearings (25), and a bearing cover (26) is fixed on the other radial bearing (25).
5. A double-inlet self-balancing multi-stage sectional centrifugal pump device according to claim 1, characterized in that, The wearing rings include a middle section wearing ring (14), an impeller wearing ring (15), a guide vane wearing ring (16), and a hub wearing ring (17).
6. A double-inlet self-balancing multi-stage segmented centrifugal pump device according to claim 1, characterized in that, A bearing body (3) and a bearing bracket (4) are provided between the two radial bearings (25).