Permanent magnet synchronous motor of oil-submerged pump

Abstract

The utility model discloses an oil-submerged pump permanent magnet synchronous motor, and relates to the technical field of oil-submerged pumps. The motor main body comprises a shell, a rotating shaft arranged at the center of the shell, a rotor structure which is detachably arranged on the rotating shaft and adopts a sectional type, and a stator structure which is arranged on the outer side of the rotor structure and adopts a riveting buckle type structure; a one-way valve and a shaft head protection sleeve arranged on one side of the one-way valve are arranged at one end of the shell; the stator structure and the rotor structure both adopt riveting buckle structures and can provide strong connection force, so that the connection between the stator punching sheet and the rotor punching sheet is firmer, and the deformation and displacement during high-speed operation or external force impact can be reduced, thereby improving the stability and reliability of the whole mechanical system and prolonging the service life of the motor. The segmented rotor structure has the advantages of improving the sealing performance, enhancing the mechanical strength and improving the operation efficiency, and the efficiency and the power density of the motor can be improved and the energy consumption can be reduced through the magnetic steel and the copper conducting bars.

Description

Technical Field

[0001] This utility model belongs to the field of submersible pump technology, specifically a permanent magnet synchronous motor for a submersible pump. Background Technology

[0002] A submersible pump is a device used to transport liquids from underground reservoirs to the surface. It is widely used in the oil and gas industries. Submersible pumps are typically installed at the bottom of oil wells and are driven by a motor to extract underground oil or natural gas to the surface. With advancements in oilfield development technology, especially in deep-sea and unconventional oil and gas fields, the technical requirements for submersible pumps are constantly increasing, demanding higher reliability, efficiency, and corrosion resistance. Compared to ordinary motors, they have the following characteristics: a slender body, generally less than 160mm in diameter and 5-10m in length (some are even longer), with a length-to-diameter ratio of 28.3-125.2; a hollow shaft for easy circulation and cooling of the motor; high starting torque, reaching rated speed in 0.3s; low moment of inertia, with a coasting time generally not exceeding 3s; high insulation level, with insulation materials resistant to high temperatures, high pressures, and the combined effects of oil, gas, and water; the motor cavity is filled with motor oil to isolate the well fluid and facilitate heat dissipation; and a dedicated sealing device isolates the well fluid from the motor oil.

[0003] For applications, the traditional solution uses a three-phase squirrel-cage asynchronous motor for the motor drive. This has the following disadvantages: the asynchronous motor has a low energy efficiency rating, low efficiency, and even lower efficiency under high load. It also has a low power factor, requiring higher current to achieve the same power output, which may lead to energy waste, increase energy costs, and fail to meet people's needs. Utility Model Content

[0004] The present invention aims to solve the technical problems existing in the prior art; to this end, the present invention proposes a permanent magnet synchronous motor for submersible pumps.

[0005] A permanent magnet synchronous motor for submersible pumps includes: a motor body; wherein the motor body includes a housing, a rotating shaft disposed at the center of the housing, a segmented rotor structure detachably mounted on the rotating shaft, and a stator structure disposed on the outside of the rotor structure and employing a riveted structure; one end of the housing is provided with a one-way valve and a shaft end protective sleeve disposed on one side of the one-way valve; the bottom of the motor body has a connecting flange that can cooperate with the electric pump operating device; the stator structure has a pre-embedded thermocouple and a pre-reserved star point lead wire; the motor body of this application is applicable to 90kW to 200kW 3000r / min permanent magnet synchronous motors for submersible pumps.

[0006] As a further embodiment of this utility model: the rotor structure is composed of several sets of rotor laminations using a riveted structure, and several sets of tensioning screws are installed in a circular array on the rotor structure.

[0007] As a further embodiment of this utility model: several sets of magnet slots and several sets of guide bar slots arranged on the outside of the magnet slots are symmetrically opened on the rotor laminations. Magnets are installed in the magnet slots and copper guide bars are installed in the guide bar slots. The magnets are made of samarium cobalt magnets.

[0008] As a further embodiment of this utility model: a first sliding bearing retaining ring and a sliding bearing detachably connected to the first sliding bearing retaining ring are provided at one end of the rotating shaft that extends into the shaft head protective sleeve; an arc key and a sliding bearing support that fit with the sliding bearing are provided on the outer wall of the rotating shaft; and a thrust bearing is provided on one side of the sliding bearing support.

[0009] As a further embodiment of this utility model: a second sliding bearing retaining ring and a sliding bearing sleeve that is matched with the rotor structure are detachably installed at one end of the rotor structure, and a centering bearing is provided on the outer side of the sliding bearing sleeve.

[0010] As a further embodiment of this utility model: an oil drain valve is provided at the other end of the housing, and a shaft top is provided on the side of the oil drain valve away from the housing.

[0011] As a further embodiment of this utility model: a shaft end sliding bearing sleeve is provided at one end of the rotating shaft near the oil drain valve, and a magnet semi-arc corresponding to the rotating shaft is provided on the inner side of one end of the oil drain valve.

[0012] As a further embodiment of this utility model: the outer shell is made of 45# steel, and the rotating shaft is made of 35CrMo material.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] (1) The present invention provides strong connection force by setting the motor body, stator structure and rotor structure to adopt the riveted structure, making the connection between stator and rotor laminations more solid, reducing deformation and displacement when running at high speed or subjected to external impact, thereby improving the stability and reliability of the entire mechanical system. The segmented rotor structure has the advantages of improving sealing performance, enhancing mechanical strength and improving operating efficiency. The set magnets and copper conductor bars can improve the efficiency and power density of the motor and reduce energy consumption. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall design of this utility model.

[0016] Figure 2 This is a partial structural diagram of the rotor structure in this utility model.

[0017] Figure 3This is a partial structural diagram of the stator structure in this utility model.

[0018] In the diagram: 1. Shaft head protective sleeve; 2. First sliding bearing retaining ring; 3. Stator structure; 4. Sliding bearing; 5. Sliding bearing bracket; 6. Thrust bearing; 7. One-way valve; 8. Rotary shaft; 9. Rotor structure; 10. Second sliding bearing retaining ring; 11. Centering bearing; 12. Sliding bearing sleeve; 13. Housing; 14. Shaft end sliding bearing sleeve; 15. Magnet semi-arc; 16. Oil drain valve; 17. Shaft top; 18. Tensioning screw; 19. Magnet; 20. Copper guide bar; 21. Arc key. Detailed Implementation

[0019] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0020] Example 1

[0021] Please see Figure 1 - Figure 3 This application provides a permanent magnet synchronous motor for a submersible pump, comprising: a motor body; wherein the motor body includes a housing 13, a rotating shaft 8 disposed at the center of the housing 13, a segmented rotor structure 9 detachably disposed on the rotating shaft 8, and a stator structure 3 disposed on the outside of the rotor structure 9 and employing a riveted structure; one end of the housing 13 is provided with a one-way valve 7 and a shaft head protective sleeve 1 disposed on one side of the one-way valve 7; the bottom of the motor body has a connecting flange that can cooperate with the electric pump operating device; the stator structure 3 has a pre-embedded thermocouple and a pre-reserved star point lead wire; the motor body in this application is suitable for a 90kW to 200kW 3000r / min submersible pump permanent magnet synchronous motor.

[0022] In this utility model, the rotor structure 9 is composed of several sets of rotor laminations using a riveted structure, and several sets of tensioning screws 18 are installed in a circular array on the rotor structure 9.

[0023] In this utility model, the rotor laminations are symmetrically provided with several sets of magnet slots and several sets of guide bar slots arranged outside the magnet slots. Magnets 19 are installed in the magnet slots and copper guide bars 20 are installed in the guide bar slots. The magnets 19 are made of samarium cobalt magnets.

[0024] In this utility model, the end of the rotating shaft 8 that extends into the shaft head protective sleeve 1 is provided with a first sliding bearing retaining ring 2 and a sliding bearing 4 that is detachably connected to the first sliding bearing retaining ring 2. The outer wall of the rotating shaft 8 is provided with an arc key 21 that fits with the sliding bearing 4 and a sliding bearing support 5. A thrust bearing 6 is provided on one side of the sliding bearing support 5.

[0025] In this utility model, a second sliding bearing retaining ring 10 and a sliding bearing sleeve 12 that is matched with the rotor structure 9 are detachably installed at one end of the rotor structure 9. A straightening bearing 11 is provided on the outer side of the sliding bearing sleeve 12.

[0026] In this utility model, an oil drain valve 16 is provided at the other end of the outer shell 13, and a shaft top 17 is provided on the side of the oil drain valve 16 away from the outer shell 13.

[0027] In this utility model, a shaft end sliding bearing sleeve 14 is provided at one end of the rotating shaft 8 near the oil drain valve 16, and a magnetic semi-arc 15 corresponding to the rotating shaft 8 is provided on the inner side of one end of the oil drain valve 16.

[0028] In this utility model, the outer shell 13 is made of 45# steel, and the rotating shaft 8 is made of 35CrMo.

[0029] In summary, several sets of magnets 19 and copper conductor bars 20 are installed on the rotor structure 9, and several sets of rotor laminations and several sets of stator laminations are assembled into rotor structure 9 and stator structure 3 using a riveted structure. The rotor structure 9 is installed in sections on the rotating shaft 8 inside the housing 13. The shaft head protective sleeve 1, one-way valve 7 and oil drain valve 16 are installed on the housing 13 and assembled into the motor body.

[0030] The above embodiments are only used to illustrate the technical methods of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of this utility model without departing from the spirit and scope of the technical methods of this utility model.

Claims

1. A permanent magnet synchronous motor for a submersible pump, characterized in that, include: Motor body; The motor body includes a housing (13), a rotating shaft (8) located at the center of the housing (13), a segmented rotor structure (9) detachably mounted on the rotating shaft (8), and a stator structure (3) located on the outside of the rotor structure (9) and using a rivet-type structure. One end of the housing (13) is provided with a one-way valve (7) and a shaft head protective sleeve (1) provided on one side of the one-way valve (7).

2. The permanent magnet synchronous motor for a submersible pump according to claim 1, characterized in that, The rotor structure (9) is composed of several sets of rotor laminations in a riveted structure, and several sets of tensioning screws (18) are installed in a circular array on the rotor structure (9).

3. The permanent magnet synchronous motor for a submersible pump according to claim 2, characterized in that, The rotor laminations are symmetrically provided with several sets of magnet slots and several sets of guide bar slots arranged outside the magnet slots. Magnets (19) are installed in the magnet slots and copper guide bars (20) are installed in the guide bar slots.

4. A permanent magnet synchronous motor for a submersible pump according to claim 2, characterized in that, The shaft (8) is provided with a first sliding bearing retainer (2) and a sliding bearing (4) detachably connected to the first sliding bearing retainer (2) at one end of the shaft head protective sleeve (1). The outer wall of the shaft (8) is provided with an arc key (21) and a sliding bearing bracket (5) that fits with the sliding bearing (4). A thrust bearing (6) is provided on one side of the sliding bearing bracket (5).

5. A permanent magnet synchronous motor for a submersible pump according to claim 1, characterized in that, One end of the rotor structure (9) is detachably fitted with a second sliding bearing retainer ring (10) and a sliding bearing sleeve (12) that is set on the rotating shaft (8) and matches the rotor structure (9). A centering bearing (11) is provided on the outer side of the sliding bearing sleeve (12).

6. A permanent magnet synchronous motor for a submersible pump according to claim 1, characterized in that, An oil drain valve (16) is provided at the other end of the housing (13), and a shaft top (17) is provided on the side of the oil drain valve (16) away from the housing (13).

7. A permanent magnet synchronous motor for a submersible pump according to claim 1, characterized in that, The shaft (8) is provided with a shaft end sliding bearing sleeve (14) at one end near the oil drain valve (16), and a magnet semi-arc (15) corresponding to the shaft (8) is provided on the inner side of one end of the oil drain valve (16).

8. A permanent magnet synchronous motor for a submersible pump according to claim 1, characterized in that, The outer shell (13) is made of 45# steel, and the rotating shaft (8) is made of 35CrMo.

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