CN210669713U

CN210669713U - Small-sized shielding water-filling deep well submersible motor

Info

Publication number: CN210669713U
Application number: CN201922325996.4U
Authority: CN
Inventors: 王化祯
Original assignee: Liaoning Juji Machinery Technology Research And Development Co Ltd
Current assignee: Liaoning Juji Machinery Technology Research And Development Co Ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-06-02
Anticipated expiration: 2029-12-20

Abstract

The utility model discloses a small-sized shielding water-filling type deep well submersible motor, an upper bearing assembly 1 is fixedly connected with a stator assembly 2, a lower bearing assembly 3 is fixedly connected with the stator assembly 2, the upper end of a pump shaft 4 passes through a rotor 5 and the upper bearing assembly 1, and the lower end of the pump shaft 4 passes through the lower bearing assembly 3; the stator assembly 2 includes: the stator comprises an upper end ring 21, a machine shell 22, a stator iron core 23, a shielding sleeve 24, a stator winding 25, synthetic resin 26 and a lower end ring 27, wherein the outer circumferences of the upper end ring 21 and the lower end ring 27 are welded together by the machine shell 22, inner holes are welded together by the shielding sleeve 24 to form a sealed cavity A, the stator iron core 23 and the stator winding 25 are placed in the sealed cavity A, and the synthetic resin 26 is poured in the sealed cavity A. The beneficial effects of the utility model are that simple structure, good reliability improve the use reliability of dive motor, reduce material cost, have reduced the volume of motor, simplify the structure that small-size shielding filled water formula deep well dive motor.

Description

Small-sized shielding water-filling deep well submersible motor

Technical Field

The utility model relates to a small-size shielding formula deep well submersible motor that fills water.

Background

Deep well submersible motors used in the industries of drinking water, rural irrigation and drainage and the like can be divided into four structural types, namely a water-filled type, an oil-filled type, a dry type and a shielding type according to the structural difference caused by the difference of filled working media in the well submersible motor. The most representative motor structure is a water-filled sealed structure, and the inner cavity is filled with clear water or antirust lubricating liquid. The joint surface of each spigot is an O-shaped rubber sealing ring. The shaft extension end of the motor is provided with a sand prevention sealing device such as a rubber framework oil seal or a single-end-face mechanical seal, and solid impurities and sand particles in the external well fluid of the motor can be prevented from entering the motor. The stator (including the windings), rotor and bearings of the motor all operate in water. The stator winding of the motor is made of water-resistant winding wires made of polyethylene or polyvinyl chloride insulating materials, and has good water-resistant insulating property and long service life. The upper and lower parts of the motor are equipped with water-lubricated sliding guide bearings made of copper alloy, graphite or polymer plastics, etc., and the lower end of the rotating shaft is equipped with water-lubricated thrust bearing made of graphite or thermosetting plastics, etc. for bearing the dead weight of the rotor and the axial thrust of the water pump when the motor is running. In order to limit the upward movement of the rotating shaft when the water pump is started, the lower part of the motor is provided with an upper thrust sliding bearing. The lowest part of the motor is provided with a rubber pressure regulating capsule for regulating the volume change of the water filled in the inner cavity caused by the temperature or pressure change.

As shown in fig. 1, the canned motor is composed of a sealed stator, a rotor working in water, a water lubricated bearing, a rubber pressure regulating bladder, etc. The stator sealing structure is formed by welding a shell, a shielding sleeve made of a non-magnetic stainless steel thin-wall tube or a non-magnetic stainless steel thin plate and an end ring into an independent sealing cavity to enclose a stator core and a winding. The rotor cavity is filled with clear water or antirust lubricating liquid. The upper and lower parts of the motor are provided with radial sliding guide bearings, and the lower end of the shaft is provided with an axial thrust sliding bearing. The shaft extension end is provided with a sand prevention sealing device, and the joint surface of each spigot is provided with an O-shaped rubber sealing ring. The motor insulation comprises electromagnetic wire slot insulation, phase insulation, interlayer insulation, slot wedge, binding, fixing and insulation and the like, and due to the requirements of coil manufacturing, wire embedding and other processes, all components are assembled by independent components, and the motor insulation is a loose assembly before insulation treatment. The motor is under the action of various factors such as machinery, electric field, temperature and environment in the operation process, the loose insulation without insulation treatment can not guarantee the long-term reliable operation of the motor, the practical service life of the motor is shortened, most of windings of the common motor are in a loose embedding form, and the relative displacement, micromotion, deformation and the like generated by vibration, electromagnetic force and thermal expansion can cause mutual friction in the operation of the motor, so that the damage of the motor is caused by the damage of the insulation. In addition, the reliability of the screen-fault motor is generally higher, the stator sealing structure is more complex, the manufacturing and assembling requirements of the non-magnetic stainless steel thin-wall pipe, the end ring and the shell are higher, and the repair is more difficult. In addition, the guide bearing of the conventional submersible motor is arranged in front of the guide bearing, and the thrust bearing is arranged behind the guide bearing.

Disclosure of Invention

The utility model provides a technical problem overcome prior art not enough, provide a simple structure reliable small-size shielding formula deep well submersible motor that fills water.

The technical scheme adopted by the utility model is that the small-sized shielding water-filling deep well submersible motor has an upper bearing assembly fixedly connected with a stator assembly, a lower bearing assembly fixedly connected with the stator assembly, a rotor and the upper bearing assembly are passed through the upper end of a pump shaft, and the lower bearing assembly is passed through the lower end of the pump shaft; the stator assembly comprises: the stator comprises an upper end ring, a casing, a stator core, a shielding sleeve, a stator winding, synthetic resin and a lower end ring, wherein the upper end ring and the outer circumference of the lower end ring are welded together by the casing, inner holes are welded together by the shielding sleeve to form a sealed cavity, the stator core and the stator winding are placed in the sealed cavity, and the synthetic resin is poured in the sealed cavity.

In order to improve the integral reliability of the stator, a synthetic resin pouring process is adopted. After the motor winding is subjected to filling insulation treatment, the whole stator assembly is bonded into a whole. Thereby improving the heat resistance, the thermal conductivity, the electrical strength, the mechanical strength, the environmental medium erosion resistance and the like of the whole stator assembly insulation structure.

The main embodiment is as follows: after the synthetic resin is poured, oxygen, moisture and other chemical media in the atmosphere are not easy to invade into the insulation, so that the thermal-oxidative aging speed and the thermal-thermal aging speed are reduced, and the heat resistance of the insulation structure is improved. The heat conductivity coefficient of the synthetic resin is about 5-6 times of that of air, the air gap is replaced by the synthetic resin after the synthetic resin is poured, the heat conductivity is improved, the heat of a winding conductor is easy to be led out and dissipated, the temperature rise of a motor is reduced, the temperature difference between the winding heat point and the average temperature is reduced, and the electric strength is improved. The breakdown strength of the synthetic resin is at least 5 times that of air. The insulating structure is filled with synthetic resin to remarkably improve the electrical breakdown strength. The stator winding of the motor poured by the synthetic resin is bonded into a whole, and the mechanical strength of each part, particularly the end part of the stator winding, is obviously improved. The motor insulation layer inevitably contacts lubricating grease, moisture in the atmosphere, and various corrosive gases. The motor in coastal areas is contacted with seawater salt fog and the like. The intrusion of these media into the interior of the insulating layer accelerates the deterioration of the insulating layer. In addition, the medium and water molecules enter the insulating layer to enlarge micro cracks in the insulating layer, so that dendritic aging is formed, and penetration or creepage breakdown is caused.

The upper bearing assembly consists of an upper bearing chamber, an upper retainer ring, an upper guide bearing, a mechanical seal and a sealing gland, wherein the upper guide bearing is arranged in the upper bearing chamber, the upper retainer ring is hot-assembled on the pump shaft, the upper retainer ring is positioned below the upper guide bearing and is provided with a gap, the mechanical seal is positioned above the upper guide bearing, and the sealing gland is fixedly arranged on the upper bearing chamber. And a thrust flange is arranged in the inner hole of the upper guide bearing. The clearance between the upper retainer ring and the upper guide bearing is 1mm-1.5 mm.

The function of the upper thrust bearing is only at the moment when the motor is started, the rotor component generates an instantaneous upward axial force, and the upper thrust bearing is required to block the rotor component from moving upwards. The structure of the motor in the prior art is completed by an upper thrust disc and an upper thrust bearing together. The upper thrust bearing is changed into the upper check ring and is arranged at the upper end of the pump shaft, so that the upper check ring and the upper guide bearing (with the thrust structure) form a friction pair, and during assembly, the end surface clearance between the upper check ring and the guide bearing is ensured to be 1mm-1.5mm, thereby simplifying the structure and the assembly process and saving the cost.

The lower bearing assembly comprises a lower thrust disc, a thrust bearing, a lower guide bearing, a lower bearing chamber and a pressure regulating capsule assembly; the lower thrust disc is arranged on the pump shaft, the lower guide bearing is arranged in the lower bearing chamber, the thrust bearing is fixedly arranged at the top of the lower bearing chamber and positioned below the lower thrust disc, and the lower bearing chamber is internally provided with a pressure regulating capsule assembly.

The sliding working face block integral bearing is adopted, and the lower guide bearing is arranged below the lower thrust disc and the thrust bearing, so that the inclination angle generated in the working process of the motor is reduced, the axial unbalanced force is relatively small when the motor is started, the grinding degree of the thrust bearing is reduced, and the service life of the thrust bearing is prolonged. The floating installation of the thrust bearing is changed into fixed installation, the thrust bearing is directly fixed on the base, the lower thrust disc is directly fixed on the pump shaft during installation and is arranged on the thrust bearing, and the position precision of the installed thrust bearing is ensured by the machining precision of parts. An adjusting bolt used in the floating installation of the thrust bearing is eliminated, and the gap between the lower thrust disc and the thrust bearing is changed into a fixed gap from the adjusting gap in the assembly. The assembly efficiency is greatly improved, the error of adjusting the gap is avoided, and the assembly accuracy is improved.

The beneficial effects of the utility model are that simple structure, good reliability improve the use reliability of dive motor, reduce material cost, have reduced the volume of motor, simplify the structure that small-size shielding filled water formula deep well dive motor.

Drawings

FIG. 1 is a schematic structural view of a small-sized shielded water-filled deep well submersible motor according to the prior art;

fig. 2 is a schematic structural view of the small-sized shielding water-filled deep well submersible motor of the present invention;

fig. 3 is a schematic structural view of a stator assembly in the small-sized shielding water-filled deep well submersible motor of the present invention;

fig. 4 is a schematic structural diagram of an upper bearing assembly in the small-sized shielding water-filled deep well submersible motor of the present invention;

fig. 5 is a schematic structural view of a lower bearing assembly in the small-sized shielding water-filled deep well submersible motor of the present invention;

fig. 6 is a schematic view of the upper guide bearing structure of the small-sized shielding water-filled deep well submersible motor of the present invention.

Labeled as: 1-upper bearing assembly, 2-stator assembly, 3-lower bearing assembly, 4-pump shaft, 5-rotor, 11-upper bearing chamber, 12-upper retainer ring, 13-upper guide bearing, 14-mechanical seal, 15-sealing gland, 21-upper end ring, 22-casing, 23-stator core, 24-shielding sleeve, 25-stator winding, 26-synthetic resin, 27-lower end ring, 31-lower thrust disc, 32-thrust bearing, 33-lower guide bearing, 34-lower bearing chamber, 35-pressure regulating capsule assembly and A-sealing cavity.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 2 and 3, in the small-sized shielded water-filled deep well submersible motor, an upper bearing assembly 1 is fixedly connected with a stator assembly 2, a lower bearing assembly 3 is fixedly connected with the stator assembly 2, the upper end of a pump shaft 4 penetrates through a rotor 5 and the upper bearing assembly 1, and the lower end of the pump shaft 4 penetrates through the lower bearing assembly 3; the stator assembly 2 includes: the stator comprises an upper end ring 21, a machine shell 22, a stator iron core 23, a shielding sleeve 24, a stator winding 25, synthetic resin 26 and a lower end ring 27, wherein the outer circumferences of the upper end ring 21 and the lower end ring 27 are welded together by the machine shell 22, inner holes are welded together by the shielding sleeve 24 to form a sealed cavity A, the stator iron core 23 and the stator winding 25 are placed in the sealed cavity A, and the synthetic resin 26 is poured in the sealed cavity A.

As shown in fig. 4, the upper bearing assembly 1 is composed of an upper bearing chamber 11, an upper retainer ring 12, an upper guide bearing 1, a mechanical seal 14 and a seal gland 15, wherein the upper guide bearing 13 is installed in the upper bearing chamber 11, the upper retainer ring 12 is hot-fitted to the pump shaft 4, the upper retainer ring 12 is positioned below the upper guide bearing 13 with a gap, the mechanical seal 14 is positioned above the upper guide bearing 13, and the seal gland 15 is fixedly installed on the upper bearing chamber 11. The inner hole of the upper guide bearing 13 is provided with a thrust flange (as shown in figure 6). The clearance between the upper retainer ring 12 and the upper guide bearing 13 is 1mm-1.5 mm. The function of the upper thrust bearing is only at the moment when the motor is started, the rotor component generates an instantaneous upward axial force, and the upper thrust bearing is required to block the rotor component from moving upwards. The structure of the motor in the prior art is completed by an upper thrust disc and an upper thrust bearing together. The upper thrust bearing is changed into the upper check ring and is arranged at the upper end of the pump shaft, so that the upper check ring and the upper guide bearing (with the thrust structure) form a friction pair, and during assembly, the end surface clearance between the upper check ring and the guide bearing is ensured to be 1mm-1.5mm, thereby simplifying the structure and the assembly process and saving the cost.

As shown in fig. 5, the lower bearing assembly 3 includes a lower thrust disc 31, a thrust bearing 32, a lower guide bearing 33, a lower bearing chamber 34, and a pressure regulating capsule assembly 35; the lower thrust disc 31 is arranged on the pump shaft 4, the lower guide bearing 33 is arranged in the lower bearing chamber 34, the thrust bearing 32 is fixedly arranged at the top of the lower bearing chamber 34 and is positioned below the lower thrust disc 31, and the pressure regulating capsule assembly 35 is arranged in the lower bearing chamber 34.

Claims

1. Small-size shielding water filling type deep well submersible motor, its characterized in that: the upper bearing assembly (1) is fixedly connected with the stator assembly (2), the lower bearing assembly (3) is fixedly connected with the stator assembly (2), the upper end of the pump shaft (4) penetrates through the rotor (5) and the upper bearing assembly (1), and the lower end of the pump shaft (4) penetrates through the lower bearing assembly (3); the stator assembly (2) comprises: the stator comprises an upper end ring (21), a machine shell (22), a stator core (23), a shielding sleeve (24), a stator winding (25), synthetic resin (26) and a lower end ring (27), wherein the outer circumferences of the upper end ring (21) and the lower end ring (27) are welded together through the machine shell (22), inner holes are welded together through the shielding sleeve (24) to form a sealed cavity (A), the stator core (23) and the stator winding (25) are placed in the sealed cavity (A), and the synthetic resin (26) is poured in the sealed cavity (A).

2. The small shielded water-filled deep well submersible motor according to claim 1, characterized in that: the upper bearing assembly (1) consists of an upper bearing chamber (11), an upper retainer ring (12), an upper guide bearing (13), a mechanical seal (14) and a seal gland (15), wherein the upper guide bearing (13) is arranged in the upper bearing chamber (11), the upper retainer ring (12) is hot-assembled on the pump shaft (4), the upper retainer ring (12) is positioned below the upper guide bearing (13) and is provided with a gap, the mechanical seal (14) is positioned above the upper guide bearing (13), and the seal gland (15) is fixedly arranged on the upper bearing chamber (11).

3. The small shielded water-filled deep well submersible motor according to claim 2, characterized in that: and a thrust flange (131) is arranged in an inner hole of the upper guide bearing (13).

4. The small shielded water-filled deep well submersible motor according to claim 2, characterized in that: the clearance between the upper retainer ring (12) and the upper guide bearing (13) is 1mm-1.5 mm.

5. The small shielded water-filled deep well submersible motor according to claim 1, characterized in that: the lower bearing assembly (3) comprises a lower thrust disc (31), a thrust bearing (32), a lower guide bearing (33), a lower bearing chamber (34) and a pressure regulating capsule assembly (35); the lower thrust disc (31) is mounted on the pump shaft (4), the lower guide bearing (33) is mounted in the lower bearing chamber (34), the thrust bearing (32) is fixedly mounted at the top of the lower bearing chamber (34) and located below the lower thrust disc (31), and the pressure regulating capsule assembly (35) is mounted in the lower bearing chamber (34).