CN218071172U

CN218071172U - Forced internal and external cooling dry-type submersible motor

Info

Publication number: CN218071172U
Application number: CN202220984120.XU
Authority: CN
Inventors: 杨性楷; 谢华; 李道芳; 吴斐
Original assignee: Taizhou Yimin Electric Machinery Co ltd
Current assignee: Taizhou Yimin Electric Machinery Co ltd
Priority date: 2022-04-25
Filing date: 2022-04-25
Publication date: 2022-12-16
Anticipated expiration: 2032-04-25

Abstract

The forced internal and external cooling dry-type submersible motor is characterized in that an upper bearing seat and a lower end cover are arranged at two ends of a motor seat, and bearings are arranged in the upper bearing seat and the lower end cover; the motor base is arranged in the cooling jacket, a uniform gap is reserved between the cooling jacket and the motor base to form a cavity A, one end of the cavity A is provided with a water inlet, and the other end of the cavity A is provided with a water outlet; the tail end of the motor shaft extends out of a central through hole of the upper bearing seat, a fan impeller is mounted at the tail end of the motor shaft, a fan cover is mounted on one side of the upper bearing seat, a cavity B is formed between the upper bearing seat and the fan cover, the fan impeller is located in the cavity B, and the cavity B is communicated with an inner cavity of the motor; and a cooling coil is wound on the outer wall of the motor base, one end of the cooling coil is communicated with the cavity B, and the other end of the cooling coil is communicated with the inner cavity of the motor. The utility model provides a submersible motor has that work efficiency is high, the cooling effect is good, the operation is reliable, strong adaptability, light in weight's advantage.

Description

Forced internal and external cooling dry-type submersible motor

Technical Field

The utility model relates to a immersible pump motor technique, concretely relates to forced inside and outside cooling dry-type submersible motor.

Background

The submersible pump is matched with a dry type motor and a wet type motor, and when the diameter of the motor is limited, the submersible pump with a slender motor generally adopts the wet type motor. The wet motor adopted by the slender submersible motor is mainly characterized in that the slender motor is low in heat capacity due to long air gaps between a stator and a rotor, low in gas heat capacity and poor in convection in a closed space, so that the heat dissipation capability is low, and the wet motor is inevitably adopted; the wet motor is filled with liquid (water or oil), the heat capacity of the liquid is large, the heat dissipation capacity of the liquid is higher than that of gas, and heat generated by the rotor can be rapidly taken out and dissipated. However, the wet submersible motor also has the following defects and shortcomings:

1) The efficiency is low. The motor rotor rotates at a high speed in liquid and is blocked by the liquid, additional friction resistance is generated, the efficiency of a common wet motor is 8-15% lower than that of a dry motor, and the overall efficiency of the submersible pump is reduced by 5-9%.

2) The cost is high. The electromagnetic wire of the water-filled motor must be a plastic covered wire; the water-filled motor can not use a rolling bearing, and a sliding bearing and a plane thrust sliding bearing are required to be adopted, so that the manufacturing cost of the motor is increased.

3) The maintainability is poor. Due to the use of the plastic covered wire and the sliding bearing, the universality is not strong, and the purchasing of accessories is inconvenient, so the maintenance performance is poor.

4) And the environment is polluted. Once the motor is damaged, leaked oil pollutes water and environment.

SUMMERY OF THE UTILITY MODEL

To the weak point of the prior art, the utility model provides a force inside and outside cooling dry-type submersible motor has work efficiency height, cooling effect good, the operation is reliable, strong adaptability, light in weight's advantage.

The utility model discloses technical scheme as follows:

the forced internal and external cooling dry-type submersible motor comprises a motor base, a motor shaft, an upper bearing seat, a lower end cover and a sealing cover; the upper bearing seat and the lower end cover are arranged at two ends of the motor base, and bearings are arranged in the upper bearing seat and the lower end cover; the motor base is arranged in the cooling jacket, a uniform gap is reserved between the cooling jacket and the motor base to form a cavity A, one end of the cavity A is provided with a water inlet, and the other end of the cavity A is provided with a water outlet; the tail end of the motor shaft extends out of a central through hole of the upper bearing seat, a fan impeller is mounted at the tail end of the motor shaft, a fan cover is mounted on one side of the upper bearing seat, a cavity B is formed between the upper bearing seat and the fan cover, the fan impeller is located in the cavity B, and the cavity B is communicated with an inner cavity of the motor; and a cooling coil is wound on the outer wall of the motor base, one end of the cooling coil is communicated with the cavity B, and the other end of the cooling coil is communicated with the inner cavity of the motor. In the working process, water flows into the cavity A from the water inlet and flows out of the water pump from the water outlet, meanwhile, heat of the inner cavity of the motor is transferred to the motor base, the outer wall of the motor base is in contact with the water flow, and the water flow takes away the heat, so that a forced external water cooling system of the motor is formed; in addition, the fan impeller rotates to convey hot air in the inner cavity of the motor to the cooling coil, the outer wall of the cooling coil is in contact with water flow, the water flow takes away heat, and the cooled hot air flows into the inner cavity of the motor again, so that a forced inner air cooling system of the motor is formed.

The utility model provides a force inside and outside cooling dry-type submersible motor has that work efficiency is high, the cooling effect is good, the operation is reliable, strong adaptability, light in weight's advantage, and the concrete performance does: compared with a wet motor, the dry submersible motor of the utility model adopts a dry inner cavity, no liquid friction drag exists, energy loss is reduced, and working efficiency is improved; the cooling effect of the motor is improved by forcing the internal and external cooling systems to be mutually matched through the motor, so that the stable operation of the motor can be ensured, and the motor cannot be burnt out due to overheating; in addition, because the air quantity in the motor forced internal air cooling system and the heat exchange area of the cooling coil can be adjusted by replacing a fan impeller and changing the number of turns of the coil, the motor forced internal air cooling system can adapt to motors with various efficiencies, and has strong adaptability; finally, the utility model discloses a dry-type submersible motor, because the motor adopts the dry-type inner chamber to need not the oiling to weight has obtained lightening, and can not cause the pollution because of leaking, the feature of environmental protection is good.

Preferably, in the forced internal and external cooling dry-type submersible motor, an oil isolation chamber is formed between the lower end cover and the sealing cover, and lubricating oil is filled in the oil isolation chamber. Further, a mechanical seal A is arranged between the lower end cover and the motor shaft, a mechanical seal B is arranged between the sealing cover and the motor shaft, and the mechanical seal A and the mechanical seal B form an independent series sealing structure. The existence of mechanical seal B can prevent that rivers from getting into the grease chamber of keeping apart, and the existence of mechanical seal A can prevent that lubricating oil from getting into the motor inner chamber, and the two forms independent series connection seal structure, further guarantees the leakproofness of motor. Lubricating oil in the isolation oil chamber can cool and lubricate mechanical seal, and can form an isolation layer to prevent water flow from entering the inner cavity of the motor.

Preferably, in the forced internal and external cooling dry-type submersible motor, the cooling coil is a thin-walled tube and spirally surrounds the outer wall of the motor base. The cooling coil is a thin-walled tube, so that the heat exchange efficiency of the cooling coil and water flow can be improved; the cooling coil is the heliciform and surrounds, can increase the area of contact of cooling coil and rivers, further improves heat exchange efficiency. Further, cooling coil detachably is connected with the coil pipe joint, cooling coil passes through the coil pipe joint and links to each other with cavity B. Cooling coil detachably is connected with the coil joint to be convenient for cooling coil's installation, dismantlement and subsequent maintenance.

Preferably, in the forced internal and external cooling dry-type submersible motor, the lower end cover is mounted at one end of the cooling jacket and forms a seal with the cooling jacket, and the water inlet is arranged on the lower end cover. In the working process of the motor, water flow can flow into the cavity A from the water inlet. Furthermore, an end cover is installed at the other end of the cooling jacket, the end cover and the cooling jacket form a seal, and the water outlet is formed in the end cover. In the working process of the motor, the water flow in the cavity A can flow out from the water outlet.

Preferably, in the forced internal and external cooling dry-type submersible motor, the upper bearing seat is provided with side holes, and the cavity B is communicated with the inner cavity of the motor through the side holes. Due to the arrangement of the side holes, the cavity B can be well communicated with the inner cavity of the motor.

Drawings

Fig. 1 is a schematic structural view of the forced internal and external cooling dry-type submersible motor of the present invention;

fig. 2 is a schematic structural view of a submersible pump equipped with the submersible motor of the present invention;

the labels in the figures are: 1-a motor base; 2-motor shaft; 3-upper bearing seat and 301-side hole; 4-lower end cap; 5-sealing the cover; 6-a bearing; 7-a cooling jacket; 8-Cavity A; 9-a fan impeller; 10-blower cover; 11-cavity B; 12-a cooling coil; 13-a buffer oil chamber; 14-mechanical seal a; 15-mechanical seal B; 16-coiled tubing joint; 17-end shield; 18-a multistage impeller; 19-a water inlet; 20-a water outlet; 21-a stator; 22-rotor.

Detailed Description

The present invention will be further described with reference to the following drawings and detailed description (including examples), but not intended as a basis for limiting the invention.

Examples

Referring to fig. 1-2, the forced internal and external cooling dry-type submersible motor of the present invention comprises a motor base 1, a motor shaft 2, an upper bearing seat 3, a lower end cover 4 and a sealing cover 5; the upper bearing block 3 and the lower end cover 4 are arranged at two ends of the motor base 1, and bearings 6 are arranged in the upper bearing block 3 and the lower end cover 4; the motor base 1 is arranged in a cooling jacket 7, a uniform gap is reserved between the cooling jacket 7 and the motor base 1 to form a cavity A8, one end of the cavity A8 is provided with a water inlet 19, and the other end of the cavity A8 is provided with a water outlet 20; the tail end of the motor shaft 2 extends out of a central through hole of the upper bearing seat 3, a fan impeller 9 is mounted at the tail end of the motor shaft 2, a fan cover 10 is mounted on one side of the upper bearing seat 3, a cavity B11 is formed between the upper bearing seat 3 and the fan cover 10, the fan impeller 9 is located in the cavity B11, and the cavity B11 is communicated with an inner cavity of the motor; the outer wall of motor cabinet 1 is surrounded by cooling coil 12, cooling coil 12 one end and cavity B11 looks UNICOM, cooling coil 12 other end and motor inner chamber looks UNICOM.

In the working process of the forced internal and external cooling dry-type submersible motor, the submersible motor is connected with the multistage impeller 18, and water flows into the cavity A8 from the water inlet 19 and flows out from the water outlet 20; meanwhile, the heat of the inner cavity of the motor is transferred to the motor base 1, the outer wall of the motor base 1 is in contact with water flow, the heat is taken away by the water flow, and the temperature of the inner cavity of the motor is reduced, so that a forced external water cooling system of the motor is formed. In addition, hot air in the inner cavity of the motor flows into the cavity B11, the motor shaft 2 drives the fan impeller 9 to rotate, the hot air in the inner cavity of the motor is conveyed into the cooling coil 12, the outer wall of the cooling coil 12 is in contact with water flow, the water flow takes away heat, the cooled air flows into the inner cavity of the motor again and exchanges heat with the stator 21 and the rotor 22, the heat is taken away, and then cooling circulation is carried out again, so that a forced inner air cooling system of the motor is formed. Through the mutual matching of the forced internal cooling system and the forced external cooling system of the motor, the motor continuously exchanges heat with water flow in the working process, and the temperature inside the motor is maintained within a proper range.

As specific embodiments of the present invention, refer to fig. 1-2:

in the present embodiment, an oil-isolating chamber 13 is formed between the lower end cover 4 and the seal cover 5, and lubricating oil is filled in the oil-isolating chamber 13. Further, a mechanical seal A14 is arranged between the lower end cover 4 and the motor shaft 2, a mechanical seal B15 is arranged between the seal cover 5 and the motor shaft 2, and the mechanical seal A14 and the mechanical seal B15 form an independent series connection seal structure. The existence of mechanical seal B15 can prevent rivers from getting into isolation grease chamber 13, and the existence of mechanical seal A14 can prevent lubricating oil from getting into the motor inner chamber, and the two forms independent series connection seal structure, further guarantees the leakproofness of motor. The existence of lubricating oil in the isolation oil chamber 13 can cool and lubricate mechanical seal, and can form an isolation layer to prevent water flow from entering the inner cavity of the motor.

In this embodiment, the cooling coil 12 is a thin-walled tube and spirally surrounds the outer wall of the motor base 1. The cooling coil 12 is a thin-walled tube, so that the heat exchange efficiency between the cooling coil 12 and water flow can be improved; the cooling coil 12 is spirally wound, so that the contact area between the cooling coil 12 and water flow can be increased, and the heat exchange efficiency is further improved. Further, the cooling coil 12 is detachably connected to the coil joint 16, and the cooling coil 12 is communicated with the cavity B11 through the coil joint 16. The cooling coil 12 is removably connected to the coil fitting 16 to facilitate installation, removal and subsequent servicing of the cooling coil 12.

In this embodiment, the lower end cap 4 is installed at one end of the cooling jacket 7 and forms a seal with the cooling jacket 7, and the water inlet 19 is arranged on the lower end cap 4. During the operation of the motor, a water flow can flow into the cavity A8 from the water inlet 19. Further, an end cover 17 is installed at the other end of the cooling jacket 7, the end cover 17 and the cooling jacket 7 form a seal, and the water outlet 20 is arranged on the end cover 17. During the operation of the motor, the water flow in the cavity A8 can flow out from the water outlet 20.

In this embodiment, a side hole 301 is formed on the upper bearing seat 3, and the cavity B11 is communicated with the inner cavity of the motor through the side hole 301. The arrangement of the side hole 301 can ensure that the cavity B11 is well communicated with the inner cavity of the motor.

The above description of "up" and "down" referred to in the present application is relative to fig. 1, and should not be construed as limiting the technical solution of the present invention.

The above general description of the invention and the description of its specific embodiments in this application should not be construed as limiting the scope of the invention. Those skilled in the art can add, reduce or combine the technical features disclosed in the general description and/or the specific embodiments (including the examples) to form other technical solutions within the scope of the present application according to the disclosure of the present application without departing from the components of the present invention.

Claims

1. Force inside and outside cooling dry-type submersible motor, its characterized in that: comprises a motor base (1), a motor shaft (2), an upper bearing seat (3), a lower end cover (4) and a sealing cover (5); the upper bearing seat (3) and the lower end cover (4) are arranged at two ends of the motor base (1), and bearings (6) are arranged in the upper bearing seat (3) and the lower end cover (4); the motor base (1) is arranged in a cooling jacket (7), a uniform gap is reserved between the cooling jacket (7) and the motor base (1) to form a cavity A (8), one end of the cavity A (8) is provided with a water inlet (19), and the other end of the cavity A (8) is provided with a water outlet (20); the motor is characterized in that the tail end of the motor shaft (2) extends out of a central through hole of the upper bearing seat (3), a fan impeller (9) is mounted at the tail end of the motor shaft (2), a fan cover (10) is mounted on one side of the upper bearing seat (3), a cavity B (11) is formed between the upper bearing seat (3) and the fan cover (10), the fan impeller (9) is located in the cavity B (11), and the cavity B (11) is communicated with an inner cavity of the motor; the outer wall of motor cabinet (1) is surrounded and is had cooling coil (12), cooling coil (12) one end and cavity B (11) looks UNICOM, cooling coil (12) other end and motor inner chamber looks UNICOM.

2. A forced inside and outside cooling dry-type submersible motor as set forth in claim 1, wherein: an isolation oil chamber (13) is formed between the lower end cover (4) and the sealing cover (5), and lubricating oil is filled in the isolation oil chamber (13).

3. A forced inside and outside cooling dry-type submersible motor as set forth in claim 2, wherein: a mechanical seal A (14) is arranged between the lower end cover (4) and the motor shaft (2), a mechanical seal B (15) is arranged between the seal cover (5) and the motor shaft (2), and the mechanical seal A (14) and the mechanical seal B (15) form an independent series connection seal structure.

4. A forced inside and outside cooling dry-type submersible motor according to claim 1, characterized in that: the cooling coil (12) is a thin-walled tube and spirally surrounds the outer wall of the motor base (1).

5. A forced inside and outside cooling dry-type submersible motor as set forth in claim 4, wherein: cooling coil (12) detachably is connected with coil pipe connector (16), cooling coil (12) are through coil pipe connector (16) and cavity B (11) looks UNICOM.

6. A forced inside and outside cooling dry-type submersible motor according to claim 1, characterized in that: the lower end cover (4) is arranged at one end of the cooling jacket (7) and forms a seal with the cooling jacket (7), and the water inlet (19) is arranged on the lower end cover (4).

7. A forced inside and outside cooling dry-type submersible motor as set forth in claim 6, wherein: an end cover (17) is installed at the other end of the cooling jacket (7), the end cover (17) and the cooling jacket (7) form a seal, and the water outlet (20) is arranged on the end cover (17).

8. A forced inside and outside cooling dry-type submersible motor according to claim 1, characterized in that: and a side hole (301) is formed in the upper bearing seat (3), and the cavity B (11) is communicated with the inner cavity of the motor through the side hole (301).