Motor structure and permanent magnet deep well pump

Abstract

This application discloses a motor structure and a permanent magnet deep-well pump, relating to the technical field of deep-well pumps. The motor structure comprises a housing, a rotor and a stator disposed within the housing, and a shielding sleeve disposed within the housing. The shielding sleeve separates the housing into an inner chamber and an outer chamber. The stator is located within the outer chamber, which is filled with epoxy resin. The rotor is located within the inner chamber and is rotatably connected to the housing, with a gap between the rotor and the inner wall of the shielding sleeve. The shielding sleeve completely isolates the motor structure from water infiltrating into the housing and contacting the stator coil, thereby making the overall operation more stable.

Description

Technical Field

[0001] The present application relates to the technical field of deep well pumps, and more specifically, to a motor structure and a permanent magnet deep well pump. Background Art

[0002] The biggest feature of the deep well pump is that the motor and pump are made into one body. It is a kind of pump immersed in the groundwater well to suck and transport water. It is widely used in farmland irrigation and drainage, industrial and mining enterprises, urban water supply and drainage, and sewage treatment.

[0003] Since the motor of the deep well pump is submerged in water at the same time, when the deep well pump is immersed in water, the water pressure on the motor is relatively large. The water outside the deep well pump may seep into the motor, and the water may come into contact with the stator coil, affecting the operation of the motor. This needs to be improved. Summary of the Invention

[0004] In order to improve the problem of water seeping into the interior of the motor and affecting its operation, the present application provides a motor structure and a permanent magnet deep well pump.

[0005] This application provides a motor structure that adopts the following technical solution:

[0006] A motor structure includes a casing, wherein a rotor and a stator are arranged in the casing, and a shielding sleeve is provided in the casing, wherein the shielding sleeve separates the casing into an inner chamber and an outer chamber, wherein the stator is located in the outer chamber, and the outer chamber is filled with epoxy resin; the rotor is located in the inner chamber and is rotatably connected to the casing, and a gap is left between the rotor and the inner wall of the shielding sleeve.

[0007] Through the above technical solution, the casing is separated into an inner chamber and an outer chamber by a shielding sleeve, and the stator is located in the outer chamber and isolated by epoxy resin, thereby completely isolating water from penetrating into the casing and contacting the stator coil, making the overall use more stable.

[0008] Optionally, the rotor is a permanent magnet rotor, comprising an iron core and a rotating shaft fixed to the iron core, an outer wall of the iron core comprising a shielding layer, and a gap between the rotor and an inner wall of the shielding sleeve is 3-3.5 mm.

[0009] The above technical solution maintains a 3-3.5mm gap, making rotor installation more convenient and stable. Furthermore, the permanent magnet rotor operates through magnetic force, reducing contact between the wires and water in a winding rotor, thus improving rotor operation. A shielding layer wrapped around the outer wall of the core further isolates the rotor, reducing its impact on the permanent magnet rotor and ensuring greater stability. This also improves overall waterproofing, with a gap of 3-3.5mm, facilitating assembly and disassembly.

[0010] Optionally, a mounting hole is formed at one axial end of the housing, the mounting hole being in communication with the inner chamber, and the housing further comprises a mounting groove, the mounting groove being located at an end of the mounting hole away from the inner chamber and being coaxially arranged with the mounting hole;

[0011] The mounting groove is provided with a centering piece, which includes an adjustment ring embedded in the mounting groove and a friction ring sleeved on the rotating shaft and rotating with the adjustment ring; the adjustment ring and the mounting groove are in clearance fit.

[0012] Through the above technical solution, an adjustment ring and a friction ring are provided. The clearance between the adjustment ring and the mounting groove allows the position of the adjustment ring to be fine-tuned according to actual needs, thereby achieving a self-aligning effect of the rotating shaft. In addition, the friction ring is used to realize a rotational connection between the rotating shaft and the adjustment ring, thereby extending the overall service life.

[0013] Optionally, the mounting groove is threadedly connected to a locking ring, the locking ring is used to prevent the adjustment ring from detaching from the mounting groove, and a gap of 0.1-0.2 mm is left between the locking ring and the adjustment ring;

[0014] The rotating shaft passes through the locking ring, and a sand retaining groove is formed at one end of the locking ring away from the adjusting ring. A sand retaining ring is provided in the sand retaining groove, and the sand retaining ring is sleeved on the rotating shaft;

[0015] A sealing groove is provided at one end of the locking ring close to the adjusting ring. A sealing member is provided in the sealing groove, and the sealing member is sleeved on the rotating shaft.

[0016] Through the above technical solution, positioning is performed through the locking ring, leaving a gap of 0.1-0.2mm. During the self-aligning process, the adjusting ring can also swing for self-adjustment, so that the alignment effect is better, thereby making the rotation of the motor shaft more stable.

[0017] Optionally, a positioning hole is formed at one end of the housing away from the centering member, the positioning hole is communicated with the inner chamber, and a positioning seat is provided in the positioning hole; a through hole is formed at the end surface of the positioning seat away from the inner chamber, the rotating shaft extends into the through hole and is rotatably connected to the positioning seat, and a thrust plate assembly is provided at the end of the positioning seat close to the inner chamber; the thrust plate assembly includes a thrust seat provided on the positioning seat, a plurality of adjustment blocks provided at one end of the thrust seat away from the positioning seat, and a support ring provided at one end of the adjustment block away from the thrust seat;

[0018] The plurality of adjustment blocks are evenly distributed circumferentially along the axis of the rotating shaft, and each adjustment block includes a contact plate, a positioning block fixed to an end of the contact plate close to the thrust seat, and a convex ball fixed to an end of the positioning block away from the contact plate. An accommodating groove is correspondingly formed at an end of the thrust seat away from the positioning seat. The positioning block is located in the accommodating groove and realizes flipping adjustment of the contact plate through the convex ball.

[0019] The support ring is sleeved on the rotating shaft, one end of the support ring close to the adjustment block contacts each contact plate, and one end of the support ring away from the adjustment block contacts the axial end face of the iron core.

[0020] Through the above technical solution, a thrust plate assembly is provided. On the one hand, the thrust plate assembly positions the rotation of the rotating shaft. At the same time, the contact between the support ring and the adjusting block is made more stable through the contact of the raised point of the adjusting block, further improving the concentricity of the rotating shaft, thereby making the rotation of the rotating shaft more stable. Combined with the centering effect of the centering piece, when the rotating shaft rotates at high speed, the thrust plate assembly tends to stabilize the support for the rotor rotation. At this time, the centering piece realizes centering accordingly, further making the position of the rotation axis of the rotating shaft more stable after the rotation. In addition, based on the gap between the rotor and the inner wall of the shielding sleeve being 3-3.5mm, the friction between the rotor and the shielding sleeve is reduced during the self-centering process of the rotating shaft, making the overall operation more stable.

[0021] Optionally, the end face of the positioning seat close to the thrust seat has a positioning portion, and the outer diameter of the positioning portion gradually decreases towards the thrust seat; the end face of the thrust seat close to the positioning seat is provided with a positioning groove for the positioning portion to be embedded and positioned; the end face of the positioning portion close to the thrust seat is also provided with a limiting groove, and the end face of the thrust seat close to the positioning portion is provided with a limiting block embedded in the limiting groove.

[0022] Through the above technical solution, a positioning portion and a positioning groove are provided, and the thrust seat is positioned by the cooperation of the positioning portion and the positioning groove. When the rotating shaft is pressed against the support ring, the thrust seat is pressed against the positioning portion. At this time, the relative position of the thrust seat and the positioning portion is made more precise. In addition, the circumferential positioning is further strengthened by the limit block and the limit groove, and the circumferential rotation of the thrust seat is reduced, thereby making the use of the adjustment block more stable.

[0023] Optionally, a groove is provided at one end of the positioning seat away from the inner chamber, the groove is communicated with the inner chamber, the groove is used for installing the oil naan, the oil naan is elastic, and the groove is covered after the oil naan is installed.

[0024] Through the above technical solution, grooves are set and isolation is achieved by installing the grooves in the oil naan. When the deep well pump is placed in water, the pressure balance between the inner and outer chambers is achieved through the deformation of the oil naan, thereby reducing the situation where external water enters the inner chamber, making the overall operation more stable.

[0025] The present application also provides a permanent magnet deep well pump, comprising any one of the motor structures described above, and also comprising a water pumping assembly, wherein the water pumping assembly comprises an impeller coaxially connected to the rotor and a pump sleeve arranged on the casing and housing the impeller.

[0026] Through the above technical solution, the impeller is driven to rotate by the motor structure, and the operation of the motor is more stable, thereby making the rotation of the impeller more stable and the overall operation more stable.

[0027] The present application also provides a permanent magnet deep well pump, comprising any one of the above-mentioned motor structures, and further comprising a water pumping assembly, wherein the water pumping assembly comprises an impeller coaxially connected to the rotor and a pump sleeve disposed on the casing and housing the impeller;

[0028] It also includes a frequency conversion component, which includes a mounting shell arranged on the casing and a frequency converter arranged in the mounting shell; the frequency converter is electrically connected to the stator; and the mounting shell is also filled with epoxy resin.

[0029] The above technical solution uses a frequency converter to control the motor speed, making the deep well pump more flexible and convenient to use. Furthermore, by installing the frequency converter within the mounting case and then further isolating it with epoxy resin, the frequency converter is more waterproof, resulting in more stable overall operation.

[0030] Optionally, a connecting plate is further provided between the casing and the mounting shell, one end of the connecting plate is covered with the casing and the other end is covered with the mounting shell; an installation cavity is formed at one end of the connecting plate close to the casing, the installation cavity is communicated with the inner chamber, an oil naan is provided in the installation cavity, the oil naan is elastic, and the oil naan divides the installation cavity into two chambers, the installation cavity is communicated with a compensation hole, and the compensation hole is communicated with the chamber where the oil naan is away from the casing;

[0031] A guide groove is provided at one end of the connection plate close to the mounting shell, and the guide groove is communicated with the interior of the mounting shell. An injection hole communicated with the guide groove is opened on the outer wall of the connection plate.

[0032] The above technical solution provides a connection plate with an oil naan and compensation holes. When the deep well pump is underwater, the oil naan deforms to balance the pressure between the inner chamber and the outside world, thereby reducing the risk of water entering the inner chamber due to pressure differences, thereby ensuring greater stability. The injection hole allows for the injection of epoxy resin into the mounting housing, making the injection process more convenient.

[0033] In summary, this application includes at least one of the following beneficial technical effects:

[0034] (1) By setting up the shielding sleeve, the situation where water seeps into the casing and contacts the stator coil is completely isolated, making the overall use more stable;

[0035] (2) By setting the centering piece, the self-centering effect of the rotating shaft is achieved, thereby making the rotation of the rotating shaft more stable;

[0036] (3) By setting up a thrust plate assembly, the concentricity of the shaft rotation is further improved, making the rotation of the shaft more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic cross-sectional view of the motor structure of an embodiment;

[0038] Figure 2 A schematic cross-sectional view of the centering member structure of an embodiment;

[0039] Figure 3 An exploded schematic diagram of a centering member according to an embodiment;

[0040] Figure 4 A schematic cross-sectional view of the thrust plate assembly structure of an embodiment;

[0041] Figure 5 An exploded schematic diagram of a thrust plate assembly according to an embodiment;

[0042] Figure 6 A schematic cross-sectional view of a deep well pump structure according to an embodiment;

[0043] Figure 7 A schematic cross-sectional view of the connecting disk structure of an embodiment;

[0044] Figure 8 Schematic diagram of the explosion of the connecting plate structure of the embodiment.

[0045] Figure numerals: 1, housing; 11, sleeve; 12, upper cover seat; 121, mounting hole; 122, mounting groove; 13, lower cover seat; 131, positioning hole; 101, inner chamber; 102, outer chamber; 2, rotor; 21, iron core; 22, rotating shaft; 3, stator; 4, shielding sleeve; 5, centering piece; 51, adjusting ring; 511, mounting ring; 512, shrinking ring; 513, rotating ring; 52, friction ring 1; 7, locking ring; 8, sand retaining groove; 9, sand retaining ring; 10, sealing groove; 14, sealing piece; 15, positioning seat; 151, positioning part; 1511, limiting groove; 152, through hole; 16, friction ring 2; 17, groove; 18, thrust plate assembly; 181 , thrust seat; 1811, positioning groove; 1812, limit block; 1813, accommodating groove; 182, support ring; 183, adjustment block; 1831, contact plate; 1832, positioning block; 1833, convex ball; 19, water pump assembly; 191, impeller; 192, pump sleeve; 1921, water inlet; 20, frequency conversion assembly; 201, mounting shell; 202, frequency converter; 23, connecting plate; 231, guide groove; 232, injection hole; 233, wire hole; 234, mounting cavity; 235, ring groove; 236, compensation hole; 24, oil naan; 241, ring part; 242, extension ring; 243, sealing part; 25, support frame; 251, water hole; 26, retaining ring. DETAILED DESCRIPTION

[0046] The following is combined with Figure 1-8 This application is described in further detail.

[0047] The embodiment of the present application discloses a motor structure, such as Figure 1 As shown, the housing 1 comprises a rotor 2, and a stator 3. The housing 1 includes a cylindrical sleeve 11, an upper cover 12, and a lower cover 13. The upper cover 12 is located at one axial end of the sleeve 11, and the lower cover 13 is located at the other axial end of the sleeve 11. A shielding sleeve 4 is also provided within the housing 1. Made of non-magnetic stainless steel, the shielding sleeve 4 is cylindrical and coaxial with the sleeve 11. One axial end of the shielding sleeve 4 is fixed to the upper cover 12, and the other end is fixed to the lower cover 13. The shielding sleeve 4 separates the interior of the housing 1 into an inner chamber 101 and an outer chamber 102. The stator 3 is fixed within the housing 1 and located in the outer chamber 102. To further enhance the waterproofing effect, the outer chamber 102 is filled with epoxy resin. After the epoxy resin cures, the epoxy resin further isolates the stator 3, further enhancing the waterproofing effect of the stator 3.

[0048] The rotor 2 is located in the inner chamber 101 and can rotate relative to the casing 1. The rotor 2 is a neodymium iron boron permanent magnet rotor 2. The rotor 2 includes an iron core 21 and a rotating shaft 22 fixed to the iron core 21. The iron core 21 is formed by pressing together a plurality of punching sheets, and the neodymium iron boron permanent magnets are embedded in the grooves of the punching sheets. In actual production, in order to further isolate the iron core 21, a shielding layer is also included on the outside of the iron core 21. The shielding layer includes an annular sleeve arranged on the circumferential outer wall of the iron core 21 and two cover plates arranged at the axial ends of the iron core 21. The annular sleeve and the cover plate are both made of non-magnetic stainless steel. Each cover plate is inserted into the rotating shaft and contacts the axial end face of the iron core 21. The cover plate is welded to the rotating shaft 22 and the outer peripheral wall of the cover plate is welded to the annular sleeve to achieve seamless splicing. The ring and two cover plates are assembled and fixed to the outside of the iron core 21, covering and isolating the iron core 21, thereby isolating and protecting the iron core 21's punchings and NdFeB permanent magnets. A gap is left between the rotor 2 and the inner wall of the shielding sleeve 4, and the gap between the circumferential outer wall of the iron core 21 of the rotating shaft 22 and the inner wall of the shielding sleeve 4 is controlled to be 3-3.5 mm.

[0049] The housing 1 is further provided with a centering piece 5 and a positioning seat 15 . One end of the rotating shaft 22 is rotationally engaged with the centering piece 5 and the other end is rotationally connected to the positioning seat 15 . The rotating shaft 22 is rotated relative to the housing 1 through the centering piece 5 and the positioning seat 15 .

[0050] See also Figure 2 and Figure 3The upper cover 12 has a mounting hole 121 at one end away from the sleeve 11. The mounting hole 121 is a circular hole that communicates with the inner chamber 101. The upper cover 12 also has a mounting groove 122. The mounting groove 122 is a circular groove that is located at the end of the mounting hole 121 away from the inner chamber 101 and is coaxial with the mounting hole 121. The diameter of the mounting groove 122 is larger than the diameter of the mounting hole 121.

[0051] The centering member 5 includes an adjustment ring 51 embedded in the mounting groove 122 and a friction ring 1 52 mounted on the rotating shaft 22 and rotating with the adjustment ring 51. The adjustment ring 51 is made of stainless steel and includes a mounting ring 511 disposed within the mounting groove 122, a necking ring 512 coaxially fixedly connected to the mounting ring 511, and a rotating ring 513 coaxially fixed to the necking ring 512 at the end away from the mounting ring 511. The mounting ring 511 and the mounting groove 122 have a clearance fit. In actual production, this clearance is controlled to be 0.1-0.2 mm. The necking ring 512 extends toward the inner chamber 101. The friction ring 1 52 is located within the mounting ring 511 and is made of graphite or ceramic. During actual installation, a limit ring is fixed to the rotating shaft 22. The limit ring is located at the end of the friction ring 1 52 near the inner chamber 101 to limit the position of the friction ring 1 52.

[0052] A locking ring 7 is also threadedly connected to the mounting groove 122. It is located at the end of the adjustment ring 51 away from the inner chamber 101. The locking ring 7 has an axially defined through-hole, larger in diameter than the shaft 22, for the shaft 22 to pass through. A clearance of 0.1-0.2 mm is maintained between the locking ring 7 and the mounting ring 511 of the adjustment ring 51, allowing the adjustment ring 51 to swing within the mounting groove 122, achieving a self-aligning effect.

[0053] The end of the locking ring 7 away from the adjusting ring 51 is provided with a sand retaining groove 8, and a sand retaining ring 9 is provided in the sand retaining groove 8. The sand retaining ring 9 is sleeved on the rotating shaft 22. The sand retaining ring 9 is made of rubber. The sand retaining ring 9 blocks the entry of external mud and sand into the inner chamber 101 through the perforations. The end of the locking ring 7 close to the adjusting ring 51 is provided with a sealing groove 10, and a sealing member 14 is provided in the sealing groove 10. The sealing member 14 is sleeved on the rotating shaft 22. The sealing member 14 can be a mechanical seal or an oil seal. In actual use, the inner chamber 101 is filled with oil to enhance the lubrication effect. The sealing effect is further enhanced by the sealing member 14 to reduce the entry of external water into the inner chamber 101.

[0054] See also Figure 1 and Figure 4A positioning hole 131 is provided at one end of the lower cover seat 13 away from the centering member 5, and the positioning hole 131 is communicated with the inner chamber 101. The positioning seat 15 is fixed to the mounting seat and the positioning seat 15 extends into the positioning hole 131. A through hole 152 is provided on the end face of the positioning seat 15 away from the inner chamber 101, and the rotating shaft 22 extends into the through hole 152. The rotating shaft 22 is also sleeved with a friction ring 16. The material of the friction ring 16 is ceramic or graphite. The friction ring 16 is located in the through hole 152, and the rotating shaft 22 is rotatably connected to the positioning seat 15 through the friction ring 16. A groove 17 is also provided at the end of the positioning seat 15 away from the inner cavity. The groove 17 is coaxially arranged with the through hole 152 and the diameter of the groove 17 is larger than the diameter of the through hole 152. The groove 17 is communicated with the inner chamber 101 through the through hole 152.

[0055] See also Figure 4 and Figure 5 , a thrust disc assembly 18 is provided at the end of the positioning seat 15 close to the inner chamber 101, and the thrust disc assembly 18 includes a thrust seat 181, a support ring 182 and a plurality of adjustment blocks 183. The thrust seat 181 is located at the end of the positioning seat 15 close to the inner chamber 101, and a positioning groove 1811 is provided on the end surface of the thrust seat 181 close to the positioning seat 15. The positioning groove 1811 is a frustum groove and the diameter of the positioning groove 1811 gradually decreases towards the bottom of the groove. The end surface of the positioning seat 15 close to the thrust seat 181 has a positioning portion 151, and the positioning portion 151 is integrally arranged with the positioning seat 15. The outer diameter of the positioning portion 151 gradually decreases towards the direction close to the thrust seat 181, and the shape of the positioning portion 151 corresponds to the positioning groove 1811.

[0056] The end surface of the positioning portion 151 near the thrust seat 181 further defines a limiting groove 1511. Three limiting grooves 1511 are provided, evenly distributed circumferentially along the axis of the rotating shaft 22. Each limiting groove 1511 extends through the positioning portion 151 toward the end away from the axis of the rotating shaft 22. A limiting block 1812 is fixed to the end surface of the thrust seat 181 near the positioning portion 151. The number of limiting blocks 1812 is the same as the number of limiting grooves 1511, and their positions correspond to each other. Limiting blocks 1812 are designed to engage with corresponding limiting grooves 1511 to limit axial rotation of the thrust seat 181.

[0057] An accommodating groove 1813 is correspondingly defined at one end of the thrust seat 181 away from the positioning seat 15 . There are three accommodating grooves 1813 , and the three accommodating grooves 1813 are evenly distributed circumferentially along the rotation axis of the rotating shaft 22 .

[0058] There are three adjustment blocks 183, which are evenly distributed circumferentially along the axis of the rotating shaft 22, and are arranged one-to-one with the three receiving grooves 1813. Each adjustment block 183 includes a contact plate 1831, a positioning block 1832 fixed to the end of the contact plate 1831 near the thrust seat 181, and a convex ball 1833 fixed to the end of the positioning block 1832 away from the contact plate 1831. The positioning block 1832 is located in the receiving groove 1813 and has a large gap with the inner wall of the receiving groove 1813. The convex ball 1833 protrudes from the end surface of the positioning block 1832 and contacts the bottom of the receiving groove 1813. A gap is left between the contact plate 1831 and the thrust seat 181, allowing the contact plate 1831 to swing within a certain range along the convex ball 1833, thereby achieving flip adjustment of the contact plate 1831.

[0059] The support ring 182 is made of graphite. The support ring 182 is sleeved on the rotating shaft 22 and is located at the end of the adjustment block 183 away from the thrust seat 181. The end face of the support ring 182 close to the adjustment block 183 contacts the contact plate 1831 of each adjustment block 183 and forms a surface contact. The end face of the support ring 182 away from the adjustment block 183 contacts the axial end face of the iron core 21.

[0060] In actual use, the motor is in a vertical position, and the motor's rotating shaft 22 is rotatably connected to the positioning seat 15 via the friction ring 2 16. At this time, the position of the rotor 2 is positioned by the support of the thrust plate assembly 18. The adjustment block 183 of the thrust plate assembly 18 can contact the support ring 182 according to the actual operating conditions to support the rotor 2, thereby improving the concentricity of the rotation of the rotating shaft 22. The self-aligning function of the centering member 5 can be adapted according to the rotation of the rotating shaft 22, thereby reducing the radial thrust caused by the rotation of the rotating shaft 22, and further improving the concentricity of the rotation.

[0061] The working principle of this embodiment is:

[0062] With this motor structure, the shield sleeve 4 separates the housing 1 into an inner chamber 101 and an outer chamber 102. The stator 3 is located in the outer chamber 102 and insulated with epoxy resin, thereby reducing the risk of water infiltrating the housing 1 and coming into contact with the stator 3 coils. Furthermore, the coordination of the thrust plate assembly 18 and the centering member 5 ensures improved concentricity of the rotating shaft 22. The clearance between the rotor 2 and the inner wall of the shield sleeve 4 is 3-3.5 mm, reducing friction between the rotor 2 and the shield sleeve 4 during the self-alignment process of the rotating shaft 22, resulting in more stable and durable motor operation.

[0063] The present application also discloses a permanent magnet deep well pump. Figure 6In addition to the aforementioned motor structure, the motor further comprises a water pump assembly 19, comprising an impeller 191 and a pump sleeve 192. Impeller 191 is coaxially fixedly connected to the rotating shaft 22 of rotor 2, and multiple impellers 191 are distributed axially. Pump sleeve 192 is coaxially fixed to housing 1 and sleeves over multiple impellers 191. A water inlet 1921 is defined at one end of pump sleeve 192, near housing 1. Rotation of the rotating shaft 22 drives the multiple impellers 191 to achieve water pumping.

[0064] To facilitate speed control of the motor, the motor structure is also connected to a frequency converter assembly 20. This assembly comprises a mounting housing 201 and a frequency converter 202. A connecting plate 23 is secured to the end of the housing 1 away from the pump assembly 19. The mounting housing 201 is cylindrical, with its open end secured to the connecting plate 23. This connects the mounting housing 201 to the housing 1.

[0065] See also Figure 7 and Figure 8 One end of the connecting plate 23 fits over the motor's groove 17, and the other end fits over the opening of the mounting housing 201. The connecting plate 23 is fixedly connected to the motor's positioning seat 15 and the mounting housing 201 by welding. A guide groove 231 is defined on the end of the connecting plate 23 near the mounting housing 201. The guide groove 231 communicates with the interior of the mounting housing 201, and an injection hole 232 is defined on the outer wall of the connecting plate 23, which communicates with the guide groove 231.

[0066] The inverter 202 is located in the mounting shell 201. The inverter 202 is electrically connected to the windings of the stator 3, so that the power supply can first pass through the inverter 202 and then flow to the stator 3. The rotation speed of the motor is adjustable through the control of the inverter 202. The bottom of the guide groove 231 is also provided with a wire hole 233, through which the connecting wires of the inverter 202 and the stator 3 can be wired. In order to enhance the waterproof effect, the mounting shell 201 is filled with epoxy resin, and the inverter 202 is isolated by being coated with epoxy resin. The epoxy resin is injected into the guide groove 231 through the injection hole 232 and fills the interior of the mounting shell 201. After the epoxy resin is injected, the injection hole 232 can be screwed into the locking bolt to seal the injection hole 232.

[0067] The end of the connecting plate 23 near the housing 1 defines a mounting cavity 234, which communicates with the inner chamber 101 via the groove 17. A resilient oil nang 24 is disposed within the mounting cavity 234, dividing the mounting cavity 234 into two chambers. A compensating hole 236 connects the mounting cavity 234 to the chamber away from the housing 1.

[0068] During actual installation, an annular groove 235 is defined within the mounting cavity 234. The oil nang 24 is made of rubber and includes a ring portion 241 embedded in the annular groove 235, an extension ring 242 fixedly connected to the ring portion 241, and a sealing portion 243 fixed to the extension ring 242 away from the ring portion 241. The extension ring 242 extends away from the bottom of the mounting cavity 234 and is tapered. The sealing portion 243 is concave from the outer circumference toward the center, facing the bottom of the mounting cavity 234.

[0069] A support frame 25 is also provided within the annular groove 235. The support frame 25 is located on the side of the oil naan 24 near the bottom of the mounting cavity 234. A gap is left between the support frame 25 and the oil naan 24 to allow the oil naan 24 to deform. A water hole 251 is also provided on the end of the support frame 25 away from the oil naan 24. A retaining spring 26 is also provided on the end of the support frame 25 away from the oil naan 24. The retaining spring 26 engages within the annular groove 235, pressing against the support frame 25 and the ring portion 241 of the oil naan 24, thereby stably securing the oil naan 24 in the annular groove 235.

[0070] In actual use, when the deep well pump is running underwater, water enters the installation cavity 234 through the compensation hole 236 and contacts the oil pan 24 through the water hole 251. At this time, the deformation of the oil pan 24 can balance the pressure of the inner chamber 101 and the external environment, thereby reducing the infiltration of water into the motor.

[0071] Alternatively, the frequency converter 202 can also be external. In this case, the structure of the connecting plate 23 is not required, and the mounting shell 201 is not required. In actual use, the oil naan 24 can be directly installed in the groove 17 to cover the groove 17, and the elasticity of the oil naan 24 can be used to balance the pressure of the inner chamber 101 and the outside world.

[0072] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A motor structure, comprising a housing (1), wherein a rotor (2) and a stator (3) are arranged in the housing (1), characterized in that: A shielding sleeve (4) is provided in the housing (1), and the shielding sleeve (4) separates the housing (1) into an inner chamber (101) and an outer chamber (102); the stator (3) is located in the outer chamber (102), and the outer chamber (102) is filled with epoxy resin; the rotor (2) is located in the inner chamber (101) and is rotatably connected to the housing (1), and a gap is left between the rotor (2) and the inner wall of the shielding sleeve (4); The rotor (2) is a permanent magnet rotor (2), comprising an iron core (21) and a rotating shaft (22) fixed to the iron core (21), an outer wall of the iron core (21) comprising a shielding layer, and a gap between the rotor (2) and an inner wall of the shielding sleeve (4) is 3-3.5 mm; A mounting hole (121) is provided at one axial end of the housing (1), the mounting hole (121) being in communication with the inner chamber (101), and a mounting groove (122) is further provided at the housing (1), the mounting groove (122) being located at one end of the mounting hole (121) away from the inner chamber (101) and being coaxially arranged with the mounting hole (121); The mounting groove (122) is provided with a centering member (5), the centering member (5) comprising an adjusting ring (51) embedded in the mounting groove (122) and a friction ring (52) sleeved on the rotating shaft (22) and rotating with the adjusting ring (51); the adjusting ring (51) comprises a mounting ring (511) disposed in the mounting groove (122), a shrinking ring (512) coaxially fixedly connected to the mounting ring (511), and a rotating ring (513) coaxially fixed to one end of the shrinking ring (512) away from the mounting ring (511); the mounting ring (511) and the mounting groove (122) are in clearance fit; The mounting groove (122) is threadedly connected with a locking ring (7), and the locking ring (7) is used to limit the adjustment ring (51) from being separated from the mounting groove (122), and a gap of 0.1-0.2 mm is left between the locking ring (7) and the adjustment ring (51); The rotating shaft (22) passes through the locking ring (7), and a sand retaining groove (8) is provided at one end of the locking ring (7) away from the adjusting ring (51). A sand retaining ring (9) is provided in the sand retaining groove (8), and the sand retaining ring (9) is sleeved on the rotating shaft (22); A sealing groove (10) is provided at one end of the locking ring (7) close to the adjusting ring (51), a sealing member (14) is provided in the sealing groove (10), and the sealing member (14) is sleeved on the rotating shaft (22).

2. The motor structure according to claim 1, characterized in that: A positioning hole (131) is provided at one end of the housing (1) away from the centering member (5), the positioning hole (131) is communicated with the inner chamber (101), and the positioning hole (131) is provided with a positioning seat (15); a through hole (152) is provided at the end surface of the positioning seat (15) away from the inner chamber (101), the rotating shaft (22) extends into the through hole (152) and is rotatably connected to the positioning seat (15), and a thrust plate assembly (18) is provided at the end of the positioning seat (15) close to the inner chamber (101); the thrust plate assembly (18) includes a thrust seat (181) arranged on the positioning seat (15), a plurality of adjustment blocks (183) arranged at one end of the thrust seat (181) away from the positioning seat (15), and a support ring (182) arranged at one end of the adjustment block (183) away from the thrust seat (181); The plurality of adjustment blocks (183) are evenly distributed circumferentially along the axis of the rotating shaft (22), and each adjustment block (183) includes a contact plate (1831), a positioning block (1832) fixed to one end of the contact plate (1831) close to the thrust seat (181), and a convex ball (1833) fixed to one end of the positioning block (1832) away from the contact plate (1831). An accommodating groove (1813) is correspondingly provided at one end of the thrust seat (181) away from the positioning seat (15). The positioning block (1832) is located in the accommodating groove (1813) and realizes the flip adjustment of the contact plate (1831) through the convex ball (1833). The support ring (182) is sleeved on the rotating shaft (22), and one end of the support ring (182) close to the adjustment block (183) contacts each contact plate (1831), and one end of the support ring (182) away from the adjustment block (183) contacts the axial end face of the iron core (21).

3. The motor structure according to claim 2, characterized in that: The end surface of the positioning seat (15) close to the thrust seat (181) is provided with a positioning portion (151), and the outer diameter of the positioning portion (151) gradually decreases in the direction close to the thrust seat (181); the end surface of the thrust seat (181) close to the positioning seat (15) is provided with a positioning groove (1811) for the positioning portion (151) to be embedded and positioned; the end surface of the positioning portion (151) close to the thrust seat (181) is also provided with a limiting groove (1511), and the end surface of the thrust seat (181) close to the positioning portion (151) is provided with a limiting block (1812) embedded in the limiting groove (1511).

4. The motor structure according to claim 2, characterized in that: A groove (17) is provided at one end of the positioning seat (15) away from the inner chamber (101), and the groove (17) is communicated with the inner chamber (101). The groove (17) is used for installing the oil-filled naan (24). The oil-filled naan (24) is elastic, and the groove (17) is covered after the oil-filled naan (24) is installed.

5. A permanent magnet deep well pump, characterized in that: A motor structure comprising any one of claims 1 to 4, further comprising a water pumping assembly (19), wherein the water pumping assembly (19) comprises an impeller (191) coaxially connected to the rotor (2) and a pump sleeve (192) arranged on the casing (1) and sleeved with the impeller (191).

6. A permanent magnet deep well pump, characterized in that: A motor structure according to any one of claims 1 to 4, further comprising a water pump assembly (19), wherein the water pump assembly (19) comprises an impeller (191) coaxially connected to the rotor (2) and a pump sleeve (192) provided on the housing (1) and sleeved with the impeller (191); The invention also includes a frequency conversion component (20), wherein the frequency conversion component (20) includes a mounting shell (201) arranged on the housing (1) and a frequency converter (202) arranged in the mounting shell (201); the frequency converter (202) is electrically connected to the stator (3); and the mounting shell (201) is also filled with epoxy resin.

7. A permanent magnetic deep well pump according to claim 6, characterized in that: A connecting plate (23) is further provided between the housing (1) and the mounting shell (201), one end of the connecting plate (23) being covered with the housing (1) and the other end being covered with the mounting shell (201); an installation cavity (234) is provided at one end of the connecting plate (23) close to the housing (1), the installation cavity (234) being communicated with the inner chamber (101), an oil nang (24) being provided in the installation cavity (234), the oil nang (24) being elastic, and the oil nang (24) dividing the installation cavity (234) into two chambers, the installation cavity (234) being communicated with a compensation hole (236), the compensation hole (236) being communicated with the chamber of the oil nang (24) away from the housing (1); A guide groove (231) is provided at one end of the connection plate (23) close to the mounting shell (201), the guide groove (231) is communicated with the interior of the mounting shell (201), and an injection hole (232) is provided on the outer wall of the connection plate (23) and is communicated with the guide groove (231).

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