Shielded permanent magnet high-speed submersible pump motor

Abstract

The present invention specifically refers to a shielded permanent magnet high-speed submersible pump motor, which belongs to the technical field of submersible pumps, and includes a motor housing, an upper end cover, a lower end cover, a rotor shaft, a rotor and a stator. The stator is fixed on the inner wall of the motor housing, a shielding sleeve is arranged between the stator and the rotor, and a shielding seat is arranged above and below the stator. The shielding sleeve and the shielding seat are fixedly connected by cold welding, and combined with the inner wall of the motor housing to form a shielding cavity, and the stator is located in the shielding cavity. In the present invention, the stator is enclosed in an independent space, and the threads on the shielding sleeve have the function of heat dissipation ribs. At the same time, when the rotor is working, it drives the water flow to rotate, and the threads have a certain guiding effect on the rotation of the water flow, which speeds up the speed of water flowing through the shielding sleeve, improves the efficiency of heat exchange, effectively prevents the stator from heating or overheating, improves the working efficiency of the motor, reduces power loss, and prolongs the service life.

Description

Technical Field

[0001] The invention belongs to the technical field of submersible pumps, and in particular relates to a shielded permanent magnet high-speed submersible pump motor. Background Art

[0002] The motor used in the submersible pump needs to be immersed in water, and the stator needs to be specially waterproofed. For example, in a submersible pump motor recorded in the authorization announcement number CN201608595U, the stator is sealed by a waterproof sealant, and the outer layer of the waterproof sealant is provided with a waterproof liner. Although this method can improve the waterproofness of the stator, the overly tight sealing causes the heat generated by the stator to be unable to dissipate in time.

[0003] From the patent document with publication number CN101671426A, it can be learned that the epoxy resin composition can be poured onto the stator to play a waterproof role, and this sealant used for waterproofing generally has the characteristics of insulation, good sealing and heat resistance. Therefore, from these characteristics, it can be seen that in the document CN201608595U, even if the technical solution is provided with a water inlet hole and a water outlet and heat dissipation hole, the cold water can flow through the inside of the casing and then be discharged from the water outlet and heat dissipation hole, but because the waterproof sealant has the characteristics of heat resistance and is a resin material with certain thermal insulation properties, its thermal conductivity is poor. After the wrapped stator heats up, the heat cannot be conducted out in time, and the cold water flowing through cannot take away the heat of the stator. The motor is easy to heat up, the working efficiency will be reduced, the power consumption will increase, and the motor itself will be damaged after overheating, and the service life will be shortened. Summary of the invention

[0004] The purpose of the present invention is to provide a shielded permanent magnet high-speed submersible pump motor which can effectively dissipate heat.

[0005] The object of the present invention is achieved in this way: a shielded permanent magnet high-speed submersible pump motor comprises a motor housing, an upper end cover, a lower end cover, a rotor shaft, a rotor and a stator, wherein the stator is fixed on the inner wall of the motor housing, wherein a shielding sleeve is arranged between the stator and the rotor, and shielding seats are arranged above and below the stator, wherein the shielding sleeve and the shielding seat are fixedly connected by cold welding, and are combined with the inner wall of the motor housing to form a shielding cavity, and the stator is located in the shielding cavity.

[0006] Further optimization: a thread is arranged on the outer wall of the shielding sleeve, and the helical direction of the thread is the same as the rotation direction of the rotor.

[0007] Further optimization: A driver installation mechanism is arranged below the lower end cover, and the mechanism includes a shielding room and a driver. The driver is installed in the shielding room. A socket is arranged on the outer wall of the shielding room. A plug adapted to the socket is arranged at the bottom of the lower end cover. The shielding room and the lower end cover form a plug-in connection through the socket and the plug.

[0008] Further optimization: a retaining spring is provided at the bottom of the shielding room.

[0009] Further optimization: the socket and the plug are provided with rubber pads.

[0010] Further optimization: an upper graphite bearing is arranged on the inner side of the upper end cover, and an upper ceramic stationary plate, an upper ceramic moving plate and an upper height adjustment sleeve are arranged in sequence below the upper graphite bearing, and all three are sleeved on the rotor shaft.

[0011] Further optimization: A lower graphite bearing is arranged on the inner side of the lower end cover, and an axial adjustment plate I, an axial adjustment plate II, a lower ceramic stationary plate, a lower ceramic moving plate and a lower height adjustment sleeve are arranged in sequence above the lower graphite bearing, and all five are sleeved on the rotor shaft.

[0012] Further optimization: the upper end cover and the lower end cover are respectively provided with a water inlet hole and a water outlet hole.

[0013] Further optimization: the driving end of the rotor shaft is also provided with a sand throwing seat and a sand throwing sleeve.

[0014] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects: the stator is enclosed in an independent space, the shielding cavity is made of stainless steel, part of the heat generated by the stator is directly conducted to the shielding sleeve and the motor housing, and the other part of the heat can be dispersed in the redundant space of the shielding cavity, and then conducted to the shielding sleeve and the motor housing, and finally the heat is taken away by cold water, and the threads on the shielding sleeve itself have the function of heat dissipation ribs, and at the same time, when the rotor is working, it drives the water flow to rotate, and the threads have a certain guiding effect on the rotation of the water flow, which speeds up the speed of the water flow through the shielding sleeve, improves the efficiency of heat exchange, effectively prevents the stator from heating or overheating, improves the working efficiency of the motor, reduces the power loss, and prolongs the service life;

[0015] The driver is also enclosed in the shielded room, and heat is exchanged with the cold water flowing through the shielded room to dissipate heat for the driver. It is installed at the bottom of the lower end cover in a plug-and-play connection mode for easy replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a cross-sectional schematic diagram of the present invention;

[0017] Figure 2 yes Figure 1 A local enlarged schematic diagram of the middle A;

[0018] Figure 3 yes Figure 1 A partial enlarged schematic diagram of point B in the middle;

[0019] Figure 4It is a schematic diagram of the structure of the rotor in the present invention;

[0020] In the figure: 10-upper end cover, 11-motor housing, 12-lower end cover, 13-rotor shaft, 14-rotor, 1401-impeller blade, 15-stator, 16-shielding sleeve, 1601-thread, 17-shielding seat, 18-shielding chamber, 19-water inlet, 1901-water outlet, 20-upper graphite bearing, 21-upper ceramic stationary piece, 22-upper ceramic moving piece, 23-upper height adjustment sleeve, 24-lower graphite bearing, 25-axial adjustment piece I, 26-axial adjustment piece II, 27-lower ceramic stationary piece, 28-lower ceramic moving piece, 29-lower height adjustment sleeve, 30-sand throwing seat, 31-sand throwing sleeve, 32-driver, 33-shielding chamber, 34-circlip, 35-socket, 36-plug, 37-rubber pad. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to specific embodiments of the present invention. Figure 1 —4: Shielded permanent magnet high-speed submersible pump motor, including a motor housing 11, an upper end cover 10, a lower end cover 12, a rotor shaft 13, a rotor 14 and a stator 15. The upper end cover 10 and the lower end cover 12 are respectively provided with a water inlet hole 19 and a water outlet hole 1901. The stator 15 is fixed on the inner wall of the motor housing 11, wherein a shielding sleeve 16 is provided between the stator 15 and the rotor 14, the shielding sleeve 16 is tightly attached to the stator 15, and a gap is provided between the shielding sleeve 16 and the rotor 14, and a shielding seat 17 is provided above and below the stator 15. The shielding sleeve 16 and the shielding seat 17 are fixedly connected by cold welding, and combined with the inner wall of the motor housing 11 to form a shielding cavity 18. The stator 15 is located in the shielding cavity 18. The shielding sleeve 16 and the shielding seat 17 are both made of stainless steel and can effectively conduct heat.

[0022] When the shielding cavity 18 is formed by cold welding, argon is used as a protective gas, and argon is continuously filled into the shielding cavity 18 during welding, so that the shielding cavity 18 is filled with argon after forming. Through the protection of argon, the heat emitted by the stator 15 during operation will not cause oxidation of the stator 15 itself, and oxidation will not occur at the welding point in the shielding cavity, thereby improving the sealing performance, making the motor performance stable and the service life long.

[0023] In order to improve the heat dissipation effect, a thread 1601 is provided on the outer wall of the shielding sleeve 16. The spiral line direction of the thread 1601 is the same as the direction of the rotor. The thread 1601 itself has the function of a heat dissipation rib. At the same time, when the rotor 14 is working, it drives the water flow to rotate. The thread 1601 has a certain guiding effect on the rotation of the water flow, which speeds up the speed of the water flowing through the shielding sleeve 16. In order to cooperate with the thread 1601 on the shielding sleeve 16 to play a greater role, a plurality of impeller blades 1401 are provided on the outer wall of the rotor 14. The distance that the impeller blades 1401 extend outward is less than the gap between the shielding sleeve 16 and the rotor 14. The impeller blades 1401 can be arranged in a row or arranged in a spiral around the rotor. In the motor, the impeller blades 1401 can drive the water flow to flow through the thread 1601 on the shielding sleeve 16 at a faster speed, further improving the efficiency of heat dissipation.

[0024] Similarly, the driver 32 is installed in the shielding room 33, which is filled with argon gas. The shielding room 33 is made of stainless steel by cold welding process, and has good waterproof and heat transfer properties. The shielding room 33 is installed below the lower end cover 12 and fixed to the inner wall of the motor housing 11 by a retaining ring 34. A socket 35 is provided on the outer wall of the shielding room 33, and a plug 36 matching the socket 35 is provided at the bottom of the lower end cover 12. The shielding room 33 and the lower end cover 12 form a plug-in connection through the socket 35 and the plug 36, which is convenient for replacement. The socket 35 and the plug 36 are covered with a rubber pad 37 to play a waterproof role.

[0025] In order to ensure the stable operation of the rotor shaft 13, an upper graphite bearing 20 is provided on the inner side of the upper end cover 10, and an upper ceramic stationary plate 21, an upper ceramic moving plate 22 and an upper height adjustment sleeve 23 are sequentially provided below the upper graphite bearing 20, all of which are sleeved on the rotor shaft. The height of the rotor can be fine-tuned by the upper height adjustment sleeve 23.

[0026] A lower graphite bearing 24 is arranged on the inner side of the lower end cover 12, and an axial adjustment plate I 25, an axial adjustment plate II 26, a lower ceramic stationary plate 27, a lower ceramic moving plate 28 and a lower height adjustment sleeve 29 are arranged in sequence above the lower graphite bearing 24, all of which are sleeved on the rotor shaft 13. The rotor shaft 13 is connected to the impeller of the submersible pump. During the driving process, the vibration generated on the impeller is easily transmitted to the rotor shaft, and the axial adjustment plate I 25 and the axial adjustment plate II 26 can prevent the axial string movement of the rotor shaft and reduce the resonance frequency.

[0027] The driving end of the rotor shaft 13 is also provided with a sand throwing seat 30 and a sand throwing sleeve 31, which act on the joint of the rotor shaft and the upper end cover to prevent sand from being stuck in the gap between the rotor shaft and the upper end cover and causing wear.

[0028] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A shielded permanent magnet high-speed submersible pump motor, comprising a motor housing (11), an upper end cover (10), a lower end cover (12), a rotor shaft (13), a rotor (14) and a stator (15), wherein the stator (15) is fixed on the inner wall of the motor housing (11), and is characterized in that: The upper end cover (10) and the lower end cover (12) are respectively provided with a water inlet hole (19) and a water outlet hole (1901); a shielding sleeve (16) is provided between the stator (15) and the rotor (14); shielding seats (17) are provided above and below the stator (15); the shielding sleeve (16) and the shielding seat (17) are fixedly connected by cold welding and combined with the inner wall of the motor housing (11) to form a shielding cavity (18); the stator (15) is located in the shielding cavity (18 ... the shielding seat (17) are fixedly connected by cold welding and combined with the inner wall of the motor housing (11) to form a shielding cavity (18); the stator (15) is located in the shielding cavity (18); the shielding sleeve (16) and the shielding seat (17) are fixedly connected by cold welding and the shielding seat (17) are fixedly connected by cold welding and the shielding seat (17) are fixedly connected by cold welding and the shielding seat (17) are fixedly connected by cold welding and the shielding seat (17 The shielding seat (17) is made of stainless steel, and a gap is arranged between the shielding sleeve (16) and the rotor (14); a thread (1601) is arranged on the outer wall of the shielding sleeve (16), and the direction of the spiral line of the thread (1601) is the same as the direction of the rotor (14); a plurality of impeller blades (1401) are arranged on the outer wall of the rotor (14), and the distance that the impeller blades (1401) extend outward is less than the gap between the shielding sleeve (16) and the rotor (14), and the impeller blades (1401) are arranged in a row or around The impeller blade (1401) is spirally arranged around the rotor (14). When the rotor (14) is working, it drives the water flow to rotate. The screw thread (1601) has a certain guiding effect on the rotation of the water flow, thereby accelerating the speed of the water flow passing through the shielding sleeve (16). The impeller blade (1401) can drive the water flow to flow through the screw thread (1601) on the shielding sleeve (16) at a faster speed. The inner side of the upper end cover (10) is provided with an upper graphite bearing (20), and the lower side of the upper graphite bearing (20) is provided with an upper ceramic stationary plate (21), an upper ceramic moving plate (22), and a lower ceramic moving plate (23). 2) and an upper height adjustment sleeve (23), all of which are sleeved on the rotor shaft (13), and the upper height adjustment sleeve (23) is used to fine-tune the height of the rotor (14); a lower graphite bearing (24) is arranged on the inner side of the lower end cover (12), and an axial adjustment plate I (25), an axial adjustment plate II (26), a lower ceramic stationary plate (27), a lower ceramic moving plate (28) and a lower height adjustment sleeve (29) are arranged above the lower graphite bearing (24), and all of which are sleeved on the rotor shaft (13).

2. The shielded permanent magnet high-speed submersible pump motor according to claim 1 is characterized in that: A driver installation mechanism is arranged below the lower end cover (12), and the mechanism comprises a shielding chamber (33) and a driver (32). The driver (32) is installed in the shielding chamber (33). A socket (35) is arranged on the outer wall of the shielding chamber (33). A plug (36) adapted to the socket (35) is arranged at the bottom of the lower end cover (12). The shielding chamber (33) and the lower end cover (12) form a plug-in connection through the socket (35) and the plug (36).

3. The shielded permanent magnet high-speed submersible pump motor according to claim 2 is characterized in that: A clamping spring (34) is provided at the bottom of the shielding chamber (33).

4. The shielded permanent magnet high-speed submersible pump motor according to claim 2 is characterized in that: The socket (35) and the plug (36) are sleeved with a rubber pad (37).

5. The shielded permanent magnet high-speed submersible pump motor according to claim 1 is characterized in that: The driving end of the rotor shaft (13) is also provided with a sand throwing seat (30) and a sand throwing sleeve (31).

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