Seal-free vertical submerged double suction pump structure for conveying halide salt and slurry

Abstract

The utility model relates to the technical field of vertical submerged slurry pumps, in particular to a sealing-free vertical submerged double-suction pump structure for conveying halide salt and slurry, which comprises a double-suction casing, an upper water inlet is arranged on the upper portion of the double-suction casing, a lower water inlet is arranged on the lower portion of the double-suction casing, and the slurry enters from the upper end and the lower end of the double-suction casing respectively. And a double-suction open type impeller is mounted in the double-suction shell. According to the non-sealing vertical submerged double-suction pump structure for conveying halide salt and slurry, a double-suction water inlet mode is adopted, the pressure is reduced due to the fact that liquid on the upper portion of the shell is sucked into the shell, the liquid cannot enter a bearing component on the upper portion, and therefore a sealing device is omitted. The design effectively avoids the problem of sealing failure caused by the fact that the upper portion of the shell needs to be sealed to prevent liquid from entering the bearing in a traditional single suction mode, and the reliability and the service life of the pump are greatly improved. The double-suction open type impeller is designed to be of an open type structure without a front cover plate and a rear cover plate, so that liquid cannot be accumulated in the impeller after shutdown.

Description

Technical Field

[0001] This utility model relates to the field of vertical submersible slurry pump technology, specifically to a sealless vertical submersible double-suction pump structure for conveying brine and slurry. Background Technology

[0002] In industrial production, vertical submersible pumps are widely used to transport various liquid media, especially halogens and other slurries that are prone to crystallization or solidification. However, traditional vertical submersible pumps typically use a single-suction inlet and are equipped with a mechanical seal. This structure has several significant drawbacks:

[0003] Firstly, due to its single-suction design, the pump can only draw liquid from the bottom during operation, necessitating a sealing device on the upper part of the casing to prevent liquid from entering the bearing components. However, this sealing device is prone to wear failure during long-term use, especially when the pumped liquid medium is corrosive or contains solid particles. The wear rate of the sealing device will be even faster, thus reducing the pump's reliability and service life.

[0004] Secondly, when traditional vertical submersible pumps are shut down, liquid residue easily remains inside the casing and sealing devices. This liquid gradually crystallizes or solidifies after shutdown. When the pump is restarted, this crystallized or solidified liquid can obstruct the rotation of the pump rotor, leading to difficulty in starting or even failure to start. Furthermore, even if it can start, excessive starting torque can easily cause serious malfunctions such as shaft breakage. Utility Model Content

[0005] The purpose of this utility model is to provide a sealless vertical submersible double-suction pump structure for conveying brine and slurry, so as to solve the problem mentioned in the background art that traditional vertical submersible pumps usually adopt a single-suction water inlet method and are equipped with mechanical seal devices.

[0006] To achieve the above objectives, this utility model provides a sealless vertical submersible double-suction pump structure for conveying brine and slurry, including a double-suction housing, an upper water inlet at the top of the double-suction housing, and a lower water inlet at the bottom of the double-suction housing. Slurry enters from the upper and lower ends of the double-suction housing respectively. A double-suction open impeller is installed inside the double-suction housing. A main shaft is connected to the upper part of the double-suction open impeller. A connecting pipe is provided on the outer side of the main shaft. The top of the main shaft is driven to rotate by a motor. A water outlet pipe is connected to one side of the double-suction housing.

[0007] Preferably, the double-suction open impeller is designed as an open structure without front and rear cover plates, so that liquid will not accumulate inside the impeller after shutdown, effectively solving the problem of difficulty in starting or easy shaft breakage due to excessive starting torque caused by slurry crystallization during restart.

[0008] Preferably, the bottom end of the main shaft is connected and fixed to the shaft center of the double-suction open impeller by a flat key.

[0009] Preferably, the bottom end of the connecting pipe is provided with a water inlet pipe.

[0010] Preferably, a pump cover is installed at the bottom end of the connecting pipe, and the pump cover is fixed to the top of the double-suction housing by bolts.

[0011] Preferably, a positioning plate is installed at the upper end of the connecting pipe, the motor is mounted on the upper part of the positioning plate by bolts, and the upper end of the water outlet pipe is fixed on the positioning plate.

[0012] Preferably, the output shaft of the motor is connected to the main shaft via a coupling, a coupling cover is installed on the outside of the coupling, a motor base is installed on the bottom outside of the motor, a protective cover is installed on the bottom of the motor base, and the bottom of the protective cover is fixed to the positioning plate.

[0013] Preferably, a positioning bearing is installed at the upper end of the spindle, the positioning bearing is mounted on the protective cover through a bearing seat, the middle part of the spindle is connected to the connecting pipe through an upper guide bearing, and the lower part of the spindle is connected to the connecting pipe through a lower guide bearing.

[0014] Preferably, a lubrication pipe is installed on the outside of one side of the connecting pipe, and one side of the lubrication pipe extends to the positioning bearing, the upper guide bearing, and the lower guide bearing respectively through several oil injection pipes, and an oil injection end is installed at the upper end of the lubrication pipe.

[0015] Preferably, the upper outlet of the water pipe is higher than the height of the positioning plate.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. In this seal-less vertical submersible double-suction pump structure for conveying brine and slurry, the present invention adopts a double-suction water inlet method. The pressure decreases as liquid in the upper part of the casing is drawn into the casing, preventing liquid from entering the upper bearing components, thus eliminating the need for a sealing device. This design effectively avoids the sealing failure problem caused by the need for a seal on the upper part of the casing in traditional single-suction methods to prevent liquid from entering the bearings, greatly improving the pump's reliability and service life.

[0018] 2. In this seal-less vertical submersible double-suction pump structure for conveying brine and slurry, the double-suction open impeller is designed as an open structure without front and rear cover plates, so that liquid will not accumulate inside the impeller after shutdown. This design effectively solves the problem of difficult start-up caused by the crystallization or solidification of residual liquid inside the casing and sealing device of traditional vertical submersible pumps after shutdown, ensuring that the pump can start smoothly and operate stably.

[0019] 3. This seal-less vertical submersible double-suction pump for conveying halogen salts and slurries eliminates the need for a sealing device, and the impeller is designed with an open structure, reducing the number of vulnerable parts and the degree of wear, thereby lowering pump maintenance costs. Simultaneously, the lubrication pipe design facilitates the lubrication of the bearings and guide bearings, further extending the pump's service life. The double-suction volute allows water to enter from both top and bottom directions, with axial forces canceling each other out, making the pump more stable during operation. Furthermore, the placement of the positioning bearing, upper guide bearing, and lower guide bearing ensures stable operation of the main shaft, improving the overall stability of the pump. This invention is suitable for conveying halogen salts and other easily crystallizing or solidifying media, solving problems such as seal failure and starting difficulties in traditional vertical submersible pumps for conveying these media, thus broadening the pump's application range. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a partial structural schematic diagram of the present invention;

[0022] Figure 3 This is a schematic diagram of the internal structure of the double suction shell in this utility model;

[0023] The meanings of the labels in the diagram are as follows:

[0024] 1. Double-suction housing; 11. Upper inlet; 12. Lower inlet; 13. Double-suction open impeller; 14. Flat key; 2. Connecting pipe; 21. Inlet pipe; 22. Pump cover; 3. Main shaft; 31. Upper guide bearing; 32. Lower guide bearing; 4. Motor; 41. Positioning bearing; 411. Bearing housing; 42. Protective cover; 43. Coupling cover; 431. Coupling; 44. Motor base; 5. Lubrication pipe; 51. Oil injection end; 6. Water outlet pipe; 7. Positioning plate. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] This utility model provides a sealless vertical submersible double-suction pump structure for conveying brine and slurry, such as... Figures 1-3As shown, it includes a double-suction housing 1, with an upper water inlet 11 at the top and a lower water inlet 12 at the bottom. Slurry enters from the upper and lower ends of the double-suction housing 1 respectively. A double-suction open impeller 13 is installed inside the double-suction housing 1. A main shaft 3 is connected to the upper part of the double-suction open impeller 13. A connecting pipe 2 is provided on the outside of the main shaft 3. The top of the main shaft 3 is driven to rotate by a motor 4. A water outlet pipe 6 is connected to one side of the double-suction housing 1.

[0027] The pressure of the liquid in the upper part of the double-suction housing 1 is reduced because the liquid is sucked into the housing, so that the liquid will not enter the upper bearing component and cause the bearing component to fail, thus eliminating the need for a sealing device; this design avoids the disadvantage of the traditional single-suction method where the upper part of the housing needs to be sealed to prevent liquid from entering the bearing.

[0028] By setting an upper inlet 11 and a lower inlet 12 in the upper and lower parts of the double-suction housing 1 respectively, the slurry can enter the pump body from both the upper and lower ends at the same time. This double-suction water intake method can make more effective use of the suction force of the impeller 13, improve the pump's water intake efficiency and flow rate, thereby meeting the demand for efficient transportation of large amounts of brine and slurry in industrial production.

[0029] The double-suction housing 1 design reduces the pressure of the liquid in the upper part by drawing it into the housing, thus preventing liquid from entering the upper bearing components and causing bearing failure. This eliminates the need for traditional sealing devices. This seal-free design not only simplifies the pump's structure but also significantly improves its reliability and durability, especially when handling corrosive or halogenated slurries containing solid particles, reducing seal wear and replacement frequency.

[0030] The double-suction open impeller 13 design, without front and rear cover plates, prevents liquid from accumulating inside the impeller after shutdown, effectively avoiding impeller blockage and startup difficulties caused by slurry crystallization or solidification. This design ensures that the pump can still start smoothly after a long period of shutdown, reducing maintenance costs and the risk of production interruption.

[0031] The top of the spindle 3 is directly driven to rotate by the motor 4. This direct drive method reduces the number of transmission components, improves transmission efficiency, and also reduces downtime caused by transmission component failure.

[0032] The double suction housing 1, connecting pipe 2, main shaft 3, motor 4 and water outlet pipe 6 are composed of a compact integrated structure. This design not only saves installation space, but also facilitates daily maintenance and repair.

[0033] In this embodiment, the double-suction open impeller 13 is designed as an open structure without front and rear cover plates, so that liquid will not accumulate inside the impeller after shutdown, effectively solving the problem of difficulty in starting or easy shaft breakage due to excessive starting torque caused by slurry crystallization during restart.

[0034] Specifically, the bottom end of the main shaft 3 is connected and fixed to the shaft center of the double-suction open impeller 13 via a flat key 14. The flat key connection ensures a stable connection between the main shaft 3 and the double-suction open impeller 13, reliable torque transmission, and facilitates installation and disassembly, improving the pump's maintenance convenience.

[0035] Furthermore, a water inlet pipe 21 is provided at the bottom end of the connecting pipe 2. The design of the water inlet pipe 21 allows the slurry to enter the connecting pipe 2 more smoothly and be sucked into the impeller, thereby improving the pump's suction efficiency and reducing the pump performance degradation caused by poor water intake.

[0036] Furthermore, a pump cover 22 is installed at the bottom end of the connecting pipe 2, and the pump cover 22 is fixed to the top of the double-suction housing 1 by bolts. The installation of the pump cover 22 not only enhances the sealing between the connecting pipe 2 and the double-suction housing 1, but also ensures the stability of the structure by bolt fixing, preventing leakage caused by vibration or pressure changes.

[0037] Furthermore, a positioning plate 7 is installed at the upper end of the connecting pipe 2, and the motor 4 is bolted to the upper part of the positioning plate 7. The upper end of the outlet pipe 6 is fixed to the positioning plate 7. The design of the positioning plate 7 allows the motor 4, the outlet pipe 6, and the connecting pipe 2 to be installed together in an orderly manner, improving the overall integrity and stability of the pump, while also facilitating installation and debugging.

[0038] Furthermore, the output shaft of motor 4 is connected to main shaft 3 via coupling 431. A coupling cover 43 is mounted on the outer side of coupling 431, and a motor base 44 is mounted on the outer side of the bottom of motor 4. A protective cover 42 is mounted on the bottom of motor base 44, and the bottom of protective cover 42 is fixed to positioning plate 7. Coupling 431 achieves a flexible connection between motor 4 and main shaft 3, reducing damage caused by misalignment or vibration. The design of coupling cover 43, motor base 44, and protective cover 42 enhances motor protection, preventing the intrusion of external impurities or liquids and improving motor lifespan.

[0039] Furthermore, a positioning bearing 41 is installed at the upper end of the main shaft 3. The positioning bearing 41 is mounted on the protective cover 42 via a bearing housing 411. The middle part of the main shaft 3 is connected to the connecting pipe 2 via an upper guide bearing 31, and the lower part of the main shaft 3 is connected to the connecting pipe 2 via a lower guide bearing 32. The arrangement of the positioning bearing 41, the upper guide bearing 31, and the lower guide bearing 32 ensures the stability and accuracy of the main shaft 3 during operation, reduces wear and damage caused by vibration or misalignment, and improves the operating efficiency and lifespan of the pump.

[0040] Furthermore, a lubrication pipe 5 is installed on the outside of one side of the connecting pipe 2. One side of the lubrication pipe 5 extends to the positioning bearing 41, the upper guide bearing 31, and the lower guide bearing 32 respectively through several oil injection pipes. An oil injection end 51 is installed at the upper end of the lubrication pipe 5. The design of the lubrication pipe 5 and the oil injection end 51 makes the lubrication of the bearing more convenient and efficient, ensuring good lubrication of the bearing during operation and reducing wear and failure caused by poor lubrication.

[0041] Furthermore, the upper outlet of the water outlet pipe 6 is higher than the height of the positioning plate 7. This design ensures that the water outlet pipe 6 can smoothly discharge slurry during pump operation, avoiding backflow or blockage caused by an excessively low outlet position, and improving the pump's drainage efficiency and stability.

[0042] In operation, the sealless vertical submersible double-suction pump structure for conveying brine and slurry of this utility model allows the slurry to enter the pump body simultaneously from both the upper inlet 11 and the lower inlet 12 of the double-suction housing 1. This double-suction inlet method ensures that the slurry can fully utilize the suction force of the double-suction open impeller 13, thereby improving the pump's suction efficiency and flow rate.

[0043] Motor 4 drives main shaft 3 to rotate via coupling 431. Main shaft 3 drives double-suction open impeller 13 to rotate at high speed within double-suction housing 1. As the impeller rotates, the space between its blades continuously changes, creating suction and pressure zones, thereby drawing in and propelling the slurry. Due to the design of double-suction housing 1, the pressure of the liquid in the upper part decreases after being drawn into the housing, preventing liquid from entering the upper bearing components, thus eliminating the need for traditional sealing devices. This design simplifies the pump structure and improves the pump's reliability and durability.

[0044] The upper end of the spindle 3 is supported on the cover 42 by a positioning bearing 41, the middle part is connected to the connecting pipe 2 by an upper guide bearing 31, and the lower part is connected to the connecting pipe 2 by a lower guide bearing 32. These bearings ensure the stability and accuracy of the spindle 3 during operation, reducing wear and damage. Lubricant can be injected into the positioning bearing 41, upper guide bearing 31, and lower guide bearing 32 through the lubrication pipe 5 and the oil injection end 51, ensuring good lubrication of the bearings during operation and reducing wear and malfunctions.

[0045] The slurry, drawn in and propelled by the impeller, is discharged through the outlet pipe 6 on one side of the double-suction housing 1. The upper outlet of the outlet pipe 6 is higher than the positioning plate 7, ensuring smooth slurry discharge and preventing backflow or blockage. The double-suction housing 1, connecting pipe 2, main shaft 3, motor 4, and outlet pipe 6 form a compact integrated structure. This design not only saves installation space but also facilitates daily maintenance and repair. The motor 4 is bolted to the upper part of the positioning plate 7, and the upper end of the outlet pipe 6 is also fixed to the positioning plate 7, improving the pump's overall integrity and stability.

[0046] In summary, the sealless vertical submersible double-suction pump structure of this utility model achieves efficient, reliable, and durable brine and slurry transportation functions through working principles and processes such as double-suction water intake, impeller rotation to generate suction, sealless design, bearing support and guidance, bearing lubrication, slurry discharge, and overall structure and installation.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A sealless vertical submersible double-suction pump structure for conveying brine and slurry, characterized in that: The device includes a double-suction housing (1), with an upper inlet (11) at the top and a lower inlet (12) at the bottom. Slurry enters from the upper and lower ends of the double-suction housing (1). A double-suction open impeller (13) is installed inside the double-suction housing (1). A main shaft (3) is connected to the upper part of the double-suction open impeller (13). A connecting pipe (2) is provided on the outside of the main shaft (3). The top of the main shaft (3) is driven to rotate by a motor (4). A water outlet pipe (6) is connected to one side of the double-suction housing (1). A positioning plate (7) is installed at the upper end of the connecting pipe (2). The motor (4) is installed on the upper part of the positioning plate (7) by bolts. The upper end of the water outlet pipe (6) is fixed on the positioning plate (7). The output shaft of the motor (4) is connected to the main shaft (3) through a coupling (431). A coupling cover (43) is installed on the outside of the coupling (431). A motor base (44) is installed on the bottom outside of the motor (4). A protective cover (42) is installed on the bottom of the motor base (44). The bottom of the protective cover (42) is fixed on the positioning plate (7).

2. The sealless vertical submersible double-suction pump structure for conveying brine and slurry according to claim 1, characterized in that: The double-suction open impeller (13) is designed as an open structure without front and rear cover plates.

3. The sealless vertical submersible double-suction pump structure for conveying brine and slurry according to claim 1, characterized in that: The bottom end of the main shaft (3) is connected and fixed to the shaft center of the double suction open impeller (13) by a flat key (14).

4. The sealless vertical submersible double-suction pump structure for conveying brine and slurry according to claim 1, characterized in that: The bottom end of the connecting pipe (2) is provided with a water inlet pipe (21).

5. The sealless vertical submersible double-suction pump structure for conveying brine and slurry according to claim 1, characterized in that: The bottom end of the connecting pipe (2) is fitted with a pump cover (22), which is fixed to the top of the double suction housing (1) by bolts.

6. The sealless vertical submersible double-suction pump structure for conveying brine and slurry according to claim 1, characterized in that: The upper end of the spindle (3) is equipped with a positioning bearing (41), which is mounted on the cover (42) through a bearing seat (411). The middle part of the spindle (3) is connected to the connecting pipe (2) through an upper guide bearing (31), and the lower part of the spindle (3) is connected to the connecting pipe (2) through a lower guide bearing (32).

7. The sealless vertical submersible double-suction pump structure for conveying brine and slurry according to claim 6, characterized in that: A lubrication pipe (5) is installed on one side of the connecting pipe (2). One side of the lubrication pipe (5) extends to the positioning bearing (41), the upper guide bearing (31), and the lower guide bearing (32) through several oil injection pipes. An oil injection end (51) is installed at the upper end of the lubrication pipe (5).

8. The sealless vertical submersible double-suction pump structure for conveying brine and slurry according to claim 1, characterized in that: The upper outlet of the water outlet pipe (6) is higher than the height of the positioning plate (7).

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