Sea water pump with external pressure stabilizer
By using tungsten carbide mechanical seals and external pressure stabilizing devices in seawater pumps, the problems of seawater infiltration and coolant pressure difference are solved, thus achieving motor protection and long-term equipment operation.
Patent Information
- Application Number
- CN202520596207.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-01
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-04-01
AI Technical Summary
Seawater pumps are prone to seawater infiltration due to wear of mechanical seal friction pairs under harsh marine conditions, causing motor corrosion and insulation damage. At the same time, the pressure difference caused by the thermal expansion and contraction of the coolant may also cause seawater infiltration.
The mechanical seal made of tungsten carbide and the external pressure stabilizing device provide positive pressure through a high-level water tank to ensure that the motor cavity always maintains a positive pressure difference, prevents seawater from seeping in, and buffers pressure fluctuations due to thermal expansion and contraction through a circulating coolant channel.
It effectively prevents seawater from seeping into the motor cavity, protects the motor insulation, extends equipment life, and adapts to complex marine working conditions.
Smart Images
Figure CN223908410U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to seawater pump detection technical field, concretely is a seawater pump of external voltage stabilizing device. BACKGROUND
[0002] Seawater pump is a device for seawater lifting, is widely used in the equipment heat dissipation of offshore platform, seawater desalination, offshore power equipment cooling and other fields. Offshore working condition is complex and bad, especially the strong corrosion of seawater, the wear of sea sand to the component. The requirement of seawater pump is higher. Therefore, the selection of seawater pump each component material and structure is very important. However, at present, seawater pump exists various reasons, causes the breakdown, short operation life. Now in the technology, the following problems exist mainly: (1) the mechanical seal friction pair of motor is affected by sea sand, is easy to enter seawater after wearing, causes internal corrosion, influences motor insulation, even motor burns out. (2) the motor is equipped with insulating coolant, and the closed inner chamber structure. When the cooling liquid thermal expansion and cold shrink, the pressure difference between the motor inner chamber and the outside, causes seawater to seep in through the connecting surface. SUMMARY
[0003] The utility model discloses a seawater pump of external voltage stabilizing device to overcome the insufficient of prior art, the mechanical seal friction pair adopts more wear-resistant tungsten carbide material, and the particle wear resistance is stronger, and the external configuration high-position water tank is connected to the closed inner chamber of seawater pump motor through the pipeline. Ensure that the motor inner chamber has enough pressure, when the inner chamber pressure is bigger than the outside, can effectively avoid the seepage of seawater. Also avoid seawater from the mechanical seal friction pair seepage.
[0004] To realize the above object, design a kind of seawater pump of external voltage stabilizing device, including seawater pump, motor, voltage stabilizing device, the seawater pump includes pump water outlet, pump body, impeller one, impeller two, water pump bearing, pump shaft, the pump body top is equipped with pump water outlet, and the pump body lower side is connected with connecting body, and the pump body is inserted with the one end of pump shaft in connecting body, and the pump shaft is set with impeller one and impeller two, and impeller one and impeller two are respectively fixed on the pump shaft by water pump bearing, and the seawater pump lower side is connected with motor, and the seawater pump and motor are internally communicated with cooling liquid passage, and the motor lower side is equipped with thrust device, and the thrust device lower side is equipped with motor impeller, and the voltage stabilizing device is connected with cooling liquid passage by liquid supplementing pipe.
[0005] The motor includes upper bearing seat, mechanical seal, motor stator, motor rotor, motor bearing, lower bearing seat, thrust device, motor impeller, the upper bearing seat is inserted with motor rotor from top, and the motor rotor upper and lower two ends are respectively annularly equipped with motor stator, and the motor stator is fixed with motor rotor by motor bearing, and the lower end of motor rotor passes through lower bearing seat, and is inserted into thrust device and is connected and fixed.
[0006] The connection of motor and motor rotor is equipped with mechanical seal.
[0007] The seawater pump and the motor are connected through the power line, the connecting body of the seawater pump is fixed with the motor through screws, and the pump shaft of the seawater pump is fixedly connected with the upper end of the motor rotor through the shaft coupling.
[0008] The cooling liquid channel is composed of the gap in the upper bearing seat of the motor, the gap between the motor stator and the motor shell, the gap between the lower bearing seat and the motor shell, the internal flow channel of the motor impeller, the internal flow channel of the motor bearing and the gap between the motor stator and the motor rotor, and forms a circulating flow channel.
[0009] The height of the pressure stabilizing device is higher than the height of the seawater pump and the motor.
[0010] Compared with the prior art, the pressure generated by thermal expansion and cold contraction of the closed inner cavity cooling liquid is effectively avoided, the pressure stabilizing device is buffered, the pressure stabilizing device provides sufficient pressure, ensures the internal positive pressure difference, avoids seawater infiltration, and influences the internal motor, the pressure cooling liquid level of the pressure stabilizing device is always in the mechanical seal friction pair surface, and a positive pressure difference is always formed, so that seawater and sand cannot enter the mechanical seal friction pair surface to cause abrasion. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 The utility model discloses a general assembly drawing.
[0012] Figure 2 The utility model discloses a cooling liquid channel.
[0013] Figure 3 It is the partial close -up drawing of motor impeller.
[0014] Referring to Figures 1 to 3 , 1 is the pump water outlet, 2 is the pump body, 3.1 is the impeller one, 3.2 is the impeller two, 4 is the water pump bearing, 5 is the pump shaft, 6 is the connecting body, 7 is the shaft coupling, 8 is the upper bearing seat, 9 is the mechanical seal, 10 is the power line, 11 is the motor stator, 12 is the motor rotor, 13 is the motor bearing, 14 is the lower bearing seat, 15 is the thrust device, 16 is the motor impeller, 17 is the cooling liquid channel, 18 is the liquid supplementing pipe, 19 is the pressure stabilizing device. DETAILED DESCRIPTION
[0015] The utility model will be further described below according to the drawings.
[0016] As Figure 1As shown, the seawater pump comprises a pump outlet 1, a pump body 2, an impeller 3.1, an impeller 3.2, a pump bearing 4, a pump shaft 5, the top of the pump body 2 is provided with the pump outlet 1, the pump outlet 1 is responsible for discharging the pressurized seawater to the designated pipeline, the lower part of the pump body 2 is connected with a connecting body 6, the pump body 2 and the connecting body 6 are penetrated by one end of the pump shaft 5, the pump shaft 5 is sleeved with the impeller 3.1 and the impeller 3.2, the impeller 3.1 and the impeller 3.2 are respectively fixed on the pump shaft 5 through the pump bearing 4, the pump body is responsible for containing the pump shaft 5, the impeller 3.1 and the impeller 3.2, forming liquid flow, the double impellers generate centrifugal force through rotation, improving seawater pressure and flow, enhancing pumping efficiency, the seawater pump is connected with a motor below, the seawater pump and the motor are internally provided with a cooling liquid channel 17, a thrust device 15 is arranged below the motor, the thrust device 15 balances the axial thrust and prevents the motor rotor 12 from being deviated due to pressure, and the like Figure 3 As shown, the thrust device 15 is provided below the motor impeller 16, the pressure stabilizing device 19 is connected with the cooling liquid channel 17 through the liquid supplementing pipe 18, the cooling liquid channel 17 is composed of multiple gaps and flow channels, the circulating cooling liquid can circulate in the cooling liquid channel 17 to stabilize the motor temperature and prevent overheating, and the liquid supplementing pipe 18 connects the pressure stabilizing device with the cooling liquid channel 17.
[0017] The motor comprises an upper bearing seat 8, a mechanical seal 9, a motor stator 11, a motor rotor 12, a motor bearing 13, a lower bearing seat 14, a thrust device 15, a motor impeller 16, the upper bearing seat 8 is penetrated from above by the motor rotor 12, the motor rotor 12 is annularly provided with the motor stator 11 at the upper and lower ends, the motor stator 11 is fixed with the motor rotor 12 through the motor bearing 13, the lower end of the motor rotor 12 penetrates through the lower bearing seat 14 and is inserted into and fixed with the thrust device 15.
[0018] The connection part of the motor and the motor rotor 12 is provided with the mechanical seal 9, the mechanical seal 9 is made of tungsten carbide material, which prevents seawater or impurities from penetrating into the motor and protects the motor insulation.
[0019] The seawater pump and the motor are connected through a power line 10, the power line 10 provides power input for the motor to drive the motor rotor 12 to rotate, the connecting body 6 of the seawater pump is fixed with the motor through screws, the pump shaft 5 of the seawater pump is fixedly connected with the upper end of the motor rotor 12 through the shaft coupling 7, the shaft coupling 7 rigidly connects the pump shaft 5 and the motor rotor 12 to realize efficient power transmission.
[0020] As shown, Figure 2 The cooling liquid channel is composed of the gap in the upper bearing seat 8 of the motor, the gap between the motor stator 11 and the motor shell, the gap between the lower bearing seat 14 and the motor shell, the internal flow channel of the motor impeller 16, the internal flow channel of the motor bearing 13 and the gap between the motor stator 11 and the motor rotor 12, forming a circulating flow channel.
[0021] The height of the stable pressure device 19 is higher than the height of the seawater pump and the motor, the stable pressure device 19 is a high-position water tank, and the stable pressure device 19 provides positive pressure through gravity, buffers thermal expansion and cold contraction pressure fluctuation, and prevents seawater from entering the inner cavity of the motor.
[0022] The specific implementation process of the utility model is as follows: a technician checks the liquid level of the stable pressure device 19, ensures that the liquid level is higher than the seawater pump and the motor, confirms that the power line 10 is connected normally, and checks that the mechanical seal 9 has no leakage; the equipment is powered on; after being powered on, the motor electronic 11 generates a magnetic field to drive the motor rotor 12 to rotate, the shaft 7 is driven to rotate at a high speed through the coupling, the pump shaft 5, the impeller 3.1 and the impeller 3.2 are driven to rotate at a high speed, seawater is sucked into the pump body 2, is pressurized by the double impellers, and is discharged from the pump water outlet 1, the stable pressure device 19 supplements the cooling liquid to the cooling liquid channel 17 through the liquid supplementing pipe 18, maintains the positive pressure in the inner cavity, prevents seawater from entering, the motor impeller 16 drives the cooling liquid to circulate in the cooling liquid channel 17, carries away the heat of the motor, the work is completed, the technician can cut off the power supply, stops the motor from rotating, discharges the residual seawater in the pump, prevents the equipment from being corroded, regularly cleans the impeller 3.1, the impeller 3.2 and the motor impeller 16, checks the mechanical seal condition, regularly checks the liquid level of the stable pressure device, and supplements the cooling liquid in time, the utility model can effectively prevent seawater from entering the inner cavity of the motor through the high-position positive pressure design, the double-impeller structure can adapt to complex seawater working conditions, and the service life of the equipment is prolonged.
Claims
1. A seawater pump with an external voltage stabilizer, comprising a seawater pump, a motor, and a voltage stabilizer, characterized in that: The seawater pump comprises a pump water outlet (1), a pump body (2), an impeller I (3.1), an impeller II (3.2), a water pump bearing (4), a pump shaft (5), the top of the pump body (2) is provided with the pump water outlet (1), the lower part of the pump body (2) is connected with a connecting body (6), the pump body (2) and the connecting body (6) are penetrated by one end of the pump shaft (5), the pump shaft (5) is sleeved with the impeller I (3.1) and the impeller II (3.2), the impeller I (3.1) and the impeller II (3.2) are fixed on the pump shaft (5) through the water pump bearing (4), the lower part of the seawater pump is connected with a motor, the seawater pump and the motor are internally provided with a cooling liquid channel (17), the lower part of the motor is provided with a thrust device (15), the lower part of the thrust device (15) is provided with a motor impeller (16), and a pressure stabilizing device (19) is connected with the cooling liquid channel (17) through a liquid supplementing pipe (18).
2. The sea water pump of claim 1, wherein: The motor comprises an upper bearing seat (8), a mechanical seal (9), a motor stator (11), a motor rotor (12), a motor bearing (13), a lower bearing seat (14), a thrust device (15), a motor impeller (16), the upper bearing seat (8) is penetrated by the motor rotor (12) from the top, the upper and lower ends of the motor rotor (12) are respectively annularly provided with the motor stator (11), the motor stator (11) is fixed with the motor rotor (12) through the motor bearing (13), the lower end of the motor rotor (12) penetrates through the lower bearing seat (14) and is inserted into and fixed with the thrust device (15).
3. The sea water pump of claim 2, wherein: The connection between the motor and the motor rotor (12) is provided with the mechanical seal (9).
4. The sea water pump of claim 1, wherein: The seawater pump and the motor are connected through a power line (10), the connecting body (6) of the seawater pump is fixed with the motor through screws, and the pump shaft (5) of the seawater pump is fixedly connected with the upper end of the motor rotor (12) through a shaft coupling (7).
5. The sea water pump of claim 1, wherein: The cooling liquid channel is composed of a gap in the upper bearing seat (8) of the motor, a gap between the motor stator (11) and the motor shell, a gap between the lower bearing seat (14) and the motor shell, an internal flow channel of the motor impeller (16), an internal flow channel of the motor bearing (13) and a gap between the motor stator (11) and the motor rotor (12), forming a circulating flow channel.
6. The sea water pump of claim 1, wherein: The height of the pressure stabilizing device (19) is higher than the setting height of the seawater pump and the motor.