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

Abstract

The invention 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 shell, an upper water inlet is arranged on the upper portion of the double-suction shell, a lower water inlet is arranged on the lower portion of the double-suction shell, and the slurry enters from the upper end and the lower end of the double-suction shell. And a double-suction open type impeller is mounted in the double-suction shell. According to the structure of the non-sealing vertical submerged double-suction pump 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] The invention relates to the technical field of vertical submerged slurry pumps, in particular to a seal-free vertical submerged double-suction pump structure for conveying halide salt and slurry. Background Art

[0002] In industrial production, vertical submersible pumps are widely used to transport various liquid media, especially halogen salts and other slurries that are easy to crystallize or solidify. However, traditional vertical submersible pumps usually adopt a single suction water inlet method and are equipped with a mechanical seal. This structure has several significant disadvantages: First, due to the single-suction water inlet method, the pump can only suck liquid from the bottom during operation, which requires a sealing device to be installed on the upper part of the housing to prevent liquid from entering the bearing components. However, this sealing device is prone to failure due to wear during long-term use, especially when the liquid medium being transported is corrosive or contains solid particles, the sealing device will wear faster, thereby reducing the reliability and service life of the pump.

[0003] Secondly, when a traditional vertical submersible pump is shut down, liquid is likely to remain inside the casing and the sealing device, and this liquid will gradually crystallize or solidify after the pump is shut down. When the pump is started again, this crystallized or solidified liquid will hinder the rotation of the pump rotor, making it difficult to start or even impossible to start. In addition, even if it can be started, due to the excessive starting torque, it is easy to cause serious faults such as shaft breakage. Summary of the invention

[0004] The object of the present invention is to provide a seal-free vertical submersible double-suction pump structure for conveying brine and slurry, so as to solve the problem that the traditional vertical submersible pump mentioned in the above background technology usually adopts a single-suction water intake method and is provided with a mechanical sealing device.

[0005] To achieve the above-mentioned purpose, the present invention provides a seal-free vertical submersible double-suction pump structure for conveying halide salt and slurry, comprising a double-suction shell, an upper water inlet is arranged at the upper part of the double-suction shell, a lower water inlet is arranged at the lower part of the double-suction shell, the slurry enters from the upper and lower ends of the double-suction shell respectively, a double-suction open impeller is installed inside the double-suction shell, the upper part of the double-suction open impeller is connected to a main shaft, a connecting pipe is arranged on the outer side of the main shaft, the top of the main shaft is driven to rotate by a motor, and a water outlet pipe is connected to one side of the double-suction shell.

[0006] As a preferred embodiment of the present invention, 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 starting difficulty caused by slurry crystallization or easy shaft breakage due to excessive starting torque during restart.

[0007] As a preferred solution of the present invention, the bottom end of the main shaft is connected and fixed to the axis of the double-suction open impeller through a flat key.

[0008] As a preferred solution of the present invention, a water inlet pipe is provided at the bottom end of the connecting pipe.

[0009] As a preferred solution of the present invention, 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 shell by bolts.

[0010] As a preferred solution of the present invention, a positioning plate is installed at the upper end of the connecting pipe, the motor is installed 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.

[0011] As a preferred embodiment of the present invention, the output shaft of the motor is connected to the main shaft through a coupling, a coupling cover is installed on the outside of the coupling, a motor seat is installed on the outside of the bottom of the motor, a protective cover is installed on the bottom of the motor seat, and the bottom of the protective cover is fixed on the positioning plate.

[0012] As a preferred embodiment of the present invention, a locating bearing is installed at the upper end of the main shaft, and the locating bearing is installed on the shield through a bearing seat. The middle part of the main shaft is connected to the connecting pipe through an upper guide bearing, and the lower part of the main shaft is connected to the connecting pipe through a lower guide bearing.

[0013] As a preferred solution of the present invention, 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 locating bearing, the upper guide bearing, and the lower guide bearing through a plurality of oil filling pipes, and an oil filling end is installed on the upper end of the lubrication pipe.

[0014] As a preferred solution of the present invention, the upper end outlet of the water outlet pipe is higher than the height of the positioning plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the sealless vertical submersible double-suction pump structure for conveying brine and slurry, the present invention adopts a double-suction water inlet method. The pressure of the liquid in the upper part of the shell is reduced due to being sucked into the shell, so that the liquid will not enter the upper bearing component, thereby eliminating the need for a sealing device. This design effectively avoids the problem of sealing failure caused by the need to seal the upper part of the shell in the traditional single-suction method to prevent liquid from entering the bearing, greatly improving the reliability and service life of the pump.

[0016] 2. In the seal-free 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 covers, so that liquid will not accumulate inside the impeller after shutdown. This design effectively solves the problem of difficulty in starting the traditional vertical submersible pump due to crystallization or solidification of residual liquid inside the casing and sealing device after shutdown, ensuring that the pump can start smoothly and run stably.

[0017] 3. In the sealless vertical submersible double-suction pump structure for conveying halogen salts and slurries, the sealing device is omitted, and the impeller is designed as an open structure, which reduces the number of vulnerable parts and the degree of wear, thereby reducing the maintenance cost of the pump. At the same time, the design of the lubrication pipe also facilitates the lubrication of the bearings and guide bearings, further extending the service life of the pump. The double-suction volute takes in water from both the upper and lower directions, and the axial forces offset each other, making the pump more stable during operation. In addition, the arrangement of the locating bearing, the upper guide bearing and the lower guide bearing also ensures the stable operation of the main shaft and improves the overall stability of the pump. The present invention is suitable for conveying halogen salts and other slurries that are easy to crystallize or solidify, and solves the problems of sealing failure and difficulty in starting in traditional vertical submersible pumps in conveying such media, thereby broadening the application range of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a partial structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the internal structure of the double-suction housing in the present invention; The meaning of each number in the figure is: 1. Double-suction casing; 11. Upper water inlet; 12. Lower water inlet; 13. Double-suction open impeller; 14. Flat key; 2. Connecting pipe; 21. Water inlet pipe; 22. Pump cover; 3. Main shaft; 31. Upper guide bearing; 32. Lower guide bearing; 4. Motor; 41. Positioning bearing; 411. Bearing seat; 42. Protective cover; 43. Coupling cover; 431. Coupling; 44. Motor seat; 5. Lubrication pipe; 51. Oil filling end; 6. Water outlet pipe; 7. Positioning plate. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] The present invention provides a seal-free vertical submersible double-suction pump structure for conveying halogen salt and slurry, such as Figure 1-Figure 3As shown, it includes a double-suction shell 1, an upper water inlet 11 is arranged on the upper part of the double-suction shell 1, and a lower water inlet 12 is arranged on the lower part of the double-suction shell 1. The slurry enters from the upper and lower ends of the double-suction shell 1 respectively, and a double-suction open impeller 13 is installed inside the double-suction shell 1. The upper part of the double-suction open impeller 13 is connected to the main shaft 3, and a connecting pipe 2 is arranged on the outer side of the main shaft 3. The top of the main shaft 3 is driven to rotate by a motor 4, and a water outlet pipe 6 is connected to one side of the double-suction shell 1.

[0021] The pressure of the upper liquid of the double-suction shell 1 is reduced due to being sucked into the shell, so that the liquid will not enter the upper bearing component and cause failure of the bearing component, thereby eliminating the need for a sealing device; this design avoids the disadvantage of the traditional single-suction method that the upper part of the shell needs to be sealed to prevent liquid from entering the bearing.

[0022] By respectively arranging an upper water inlet 11 and a lower water inlet 12 at the upper and lower parts of the double-suction shell 1, the upper and lower ends of the slurry can enter the pump body at the same time. This double-suction water intake method can more effectively utilize the suction force of the impeller 13, improve the water absorption efficiency and flow rate of the pump, thereby meeting the demand for efficient transportation of large amounts of brine and slurry in industrial production.

[0023] Due to the design of the double-suction housing 1, the pressure of the upper liquid is reduced as it is sucked into the housing, thereby avoiding the problem of liquid entering the upper bearing components and causing bearing failure, thereby eliminating the traditional sealing device. This seal-free design not only simplifies the structure of the pump, but also greatly improves the reliability and durability of the pump, especially when dealing with corrosive halogen salts and slurries containing solid particles, reducing the wear and replacement frequency of the seals.

[0024] The double-suction open impeller 13 design has no front and rear covers, so that liquid will not accumulate 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 shutdown, reducing maintenance costs and the risk of production interruption.

[0025] The top of the main shaft 3 is directly driven to rotate by the motor 4. This direct drive mode reduces the number of transmission components, improves transmission efficiency, and also reduces downtime caused by failure of transmission components.

[0026] The double-suction shell 1, the connecting pipe 2, the main shaft 3, the motor 4 and the water outlet pipe 6 form a compact overall structure. This design not only saves installation space, but also facilitates daily maintenance and overhaul work.

[0027] 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 starting difficulty caused by slurry crystallization or easy shaft breakage due to excessive starting torque during restart.

[0028] Specifically, the bottom end of the main shaft 3 is connected and fixed to the axis of the double-suction open impeller 13 through 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 is easy to install and disassemble, thereby improving the maintenance convenience of the pump.

[0029] 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 enables the slurry to enter the connecting pipe 2 more smoothly and then be sucked by the impeller, thereby improving the water absorption efficiency of the pump and reducing the degradation of the pump performance caused by poor water inlet.

[0030] 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 bolting, and prevents leakage caused by vibration or pressure changes.

[0031] Furthermore, 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, and the upper end of the water outlet pipe 6 is fixed on the positioning plate 7. The design of the positioning plate 7 enables the motor 4, the water outlet pipe 6 and the connecting pipe 2 to be installed together in an orderly manner, thereby improving the integrity and stability of the pump and facilitating installation and commissioning.

[0032] Furthermore, 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 seat 44 is installed on the outside of the bottom of the motor 4, a shield 42 is installed on the bottom of the motor seat 44, and the bottom of the shield 42 is fixed on the positioning plate 7. The coupling 431 realizes a flexible connection between the motor 4 and the main shaft 3, reducing damage caused by poor alignment or vibration. The design of the coupling cover 43, the motor seat 44 and the shield 42 enhances the protection of the motor, prevents the intrusion of external impurities or liquids, and improves the service life of the motor.

[0033] Furthermore, a positioning bearing 41 is installed at the upper end of the main shaft 3, and the positioning bearing 41 is installed on the shield 42 through a bearing seat 411. The middle part of the main shaft 3 is connected to the connecting pipe 2 through an upper guide bearing 31, and the lower part of the main shaft 3 is connected to the connecting pipe 2 through 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 deflection, and improves the operating efficiency and life of the pump.

[0034] Furthermore, a lubrication pipe 5 is installed on the outside of one side of the connecting pipe 2, and one side of the lubrication pipe 5 is extended to the positioning bearing 41, the upper guide bearing 31, and the lower guide bearing 32 through a plurality of oil injection pipes, and an oil injection end 51 is installed on 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, ensures the good lubrication state of the bearing during operation, and reduces the wear and failure caused by poor lubrication.

[0035] Furthermore, the upper end 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 the slurry when the pump is running, avoids backflow or blockage caused by too low an outlet position, and improves the drainage efficiency and stability of the pump.

[0036] When the seal-free vertical submersible double-suction pump structure for conveying halide salt and slurry of the present invention is used, the slurry first enters the pump body from the upper water inlet 11 and the lower water inlet 12 of the double-suction housing 1 at the same time. This double-suction water intake method ensures that the slurry can fully utilize the suction force of the double-suction open impeller 13, thereby improving the water suction efficiency and flow rate of the pump.

[0037] The motor 4 drives the main shaft 3 to rotate through the coupling 431, and the main shaft 3 drives the double-suction open impeller 13 to rotate at high speed in the double-suction housing 1. When the impeller rotates, the space between its blades changes continuously, forming a suction and pressure zone, thereby sucking in and driving the slurry to flow. Due to the design of the double-suction housing 1, the pressure of the upper liquid is reduced after being sucked into the housing, which prevents the liquid from entering the upper bearing components, thereby eliminating the need for a traditional sealing device. This design simplifies the structure of the pump and improves the reliability and durability of the pump.

[0038] The upper end of the main shaft 3 is supported on the shield 42 through the positioning bearing 41, the middle part is connected to the connecting pipe 2 through the upper guide bearing 31, and the lower part is connected to the connecting pipe 2 through the lower guide bearing 32. These bearings ensure the stability and accuracy of the main shaft 3 during operation and reduce wear and damage. Lubricant can be injected into the positioning bearing 41, the upper guide bearing 31 and the lower guide bearing 32 through the lubrication pipe 5 and the oil injection end 51 to ensure good lubrication of the bearings during operation and reduce wear and failure.

[0039] The slurry sucked in and pushed by the impeller is discharged through the outlet pipe 6 on one side of the double-suction housing 1. The upper end outlet of the outlet pipe 6 is higher than the height of the positioning plate 7, which ensures that the slurry can be discharged smoothly and avoids backflow or blockage. The double-suction housing 1, the connecting pipe 2, the main shaft 3, the motor 4, the outlet pipe 6 and other components form a compact overall structure. This design not only saves installation space, but also facilitates daily maintenance and overhaul work. The motor 4 is installed on the upper part of the positioning plate 7 by bolts, and the upper end of the outlet pipe 6 is also fixed on the positioning plate 7, which improves the integrity and stability of the pump.

[0040] In summary, the sealless vertical submersible double-suction pump structure of the present invention realizes the efficient, reliable and durable halide and slurry transportation function through the working principles and processes of double suction water inlet, impeller rotation to generate suction, sealless design, bearing support and guide, bearing lubrication, slurry discharge, and overall structure and installation.

[0041] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A sealless vertical submersible double-suction pump structure for conveying brine and slurry, characterized in that: The invention comprises a double-suction shell (1), wherein an upper water inlet (11) is arranged at the upper part of the double-suction shell (1), and a lower water inlet (12) is arranged at the lower part of the double-suction shell (1); slurry enters the double-suction shell (1) from the upper and lower ends thereof respectively; a double-suction open impeller (13) is installed inside the double-suction shell (1); a main shaft (3) is connected to the upper part of the double-suction open impeller (13); a connecting pipe (2) is arranged on the outer side of the main shaft (3); the top of the main shaft (3) is driven to rotate by a motor (4); and a water outlet pipe (6) is connected to one side of the double-suction shell (1).

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

3. The seal-free vertical submersible double-suction pump structure for conveying halogen salt and slurry according to claim 1 is characterized in that: The bottom end of the main shaft (3) is connected and fixed to the axis of the double-suction open impeller (13) via a flat key (14).

4. The seal-free vertical submersible double-suction pump structure for conveying halogen salt and slurry according to claim 1 is characterized in that: A water inlet pipe (21) is provided at the bottom end of the connecting pipe (2).

5. The seal-free vertical submersible double-suction pump structure for conveying halogen salt and slurry according to claim 1 is characterized in that: 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 means of bolts.

6. The seal-free vertical submersible double-suction pump structure for conveying halogen salt and slurry according to claim 1 is characterized in that: 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 means of bolts, and the upper end of the water outlet pipe (6) is fixed on the positioning plate (7).

7. The seal-free vertical submersible double-suction pump structure for conveying halogen salt and slurry according to claim 6 is characterized in that: The output shaft of the motor (4) is connected to the main shaft (3) via a coupling (431); a coupling cover (43) is installed on the outside of the coupling (431); a motor seat (44) is installed on the outside of the bottom of the motor (4); a shield (42) is installed on the bottom of the motor seat (44); and the bottom of the shield (42) is fixed on the positioning plate (7).

8. The seal-free vertical submersible double-suction pump structure for conveying halogen salt and slurry according to claim 7 is characterized in that: A locating bearing (41) is installed at the upper end of the main shaft (3), and the locating bearing (41) is installed on the shield (42) through a bearing seat (411). The middle part of the main shaft (3) is connected to the connecting pipe (2) through an upper guide bearing (31), and the lower part of the main shaft (3) is connected to the connecting pipe (2) through a lower guide bearing (32).

9. The seal-free vertical submersible double-suction pump structure for conveying halogen salt and slurry according to claim 8 is characterized in that: 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) through a plurality of oil injection pipes; an oil injection end (51) is installed at the upper end of the lubrication pipe (5).

10. The seal-free vertical submersible double-suction pump structure for conveying halogen salt and slurry according to claim 6 is characterized in that: The upper end outlet of the water outlet pipe (6) is higher than the height of the positioning plate (7).

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