Deep well water pump

Abstract

The present invention relates to the technical field of water pumps, and specifically to a deep-well water pump, comprising: a pump housing, a water inlet, a water outlet, an impeller assembly, and a drive motor provided on the pump housing, the drive motor comprising a housing having a stator mounting space and a rotor mounting space, a lower bearing seat provided at the lower end of the housing, an upper bearing seat provided at the upper end of the housing, the lower bearing seat and the upper bearing seat being rotatably connected to a rotating shaft, a bearing assembly provided between the top of the lower bearing seat and the lower end face of the rotor, at least a portion of the bearing assembly being circumferentially fixedly connected to the lower bearing seat, and the remaining portion of the bearing assembly being in active contact with at least a portion of the bearing assembly and fixed to the lower end face of the rotor, a shaft movement limiter provided between the upper bearing seat and the upper end of the rotor on the rotating shaft. The present invention uses the bearing assembly to rotationally fix the rotor and provide support for the deep-well water pump, thereby preventing the rotating shaft from being offset or damaged, thereby improving the service life of the deep-well water pump.

Description

Technical Field

[0001] The present invention relates to the technical field of water pumps, in particular to a deep well water pump. Background Art

[0002] The most distinctive feature of a deep-well pump is its integrated motor and pump assembly. This pump, immersed in a groundwater well, pumps water and delivers it. It is widely used in agricultural irrigation and drainage, industrial and mining enterprises, urban water supply and drainage, and sewage treatment. The operating principle of a deep-well pump is that the motor drives the pump shaft, which in turn drives the impeller to rotate at high speed, pumping water from the bottom of the well to the surface.

[0003] In deep-well water pumps, groundwater pressure and the weight of the pump shaft generate axial forces that need to be absorbed by bearings to prevent the shaft from deflecting or being damaged by excessive axial forces. Conventional technology typically employs ball bearings to support the rotor and securely support the pump shaft, ensuring axial stability while allowing for free rotation.

[0004] However, the bearings used in the rotating shafts of existing deep well water pumps need to support the rotor and the impeller connected to the rotating shaft. The bearing method used will increase friction when bearing, affecting the service life and pumping efficiency of the water pump. Summary of the Invention

[0005] In view of this, the deep well water pump proposed in the present invention is intended to solve the problems existing in the current technology.

[0006] The present invention proposes a deep well water pump, comprising a pump casing, a water inlet being provided in the middle of the pump casing, and a water outlet being provided at the top of the pump casing, an impeller group being provided in the pump casing, and the impeller group being connected to a drive motor, the drive motor comprising a casing having a stator mounting space and a rotor mounting space, the stator of the drive motor being fixed in the stator mounting space, the rotor of the drive motor being located in the rotor mounting space, a lower bearing seat being provided at the lower end of the casing, an upper bearing seat being provided at the upper end of the casing, the lower bearing seat and the upper bearing seat being rotatably connected to a rotating shaft respectively, a bearing assembly being provided between the top of the lower bearing seat and the lower end face of the rotor, at least a portion of the bearing assembly being circumferentially fixedly connected to the lower bearing seat, and the remaining portion of the bearing assembly being in movably contact with at least a portion of the bearing assembly and fixed to the lower end face of the rotor, and a shaft movement limiter being provided on the rotating shaft between the upper bearing seat and the upper end of the rotor.

[0007] In some embodiments of the present application, the bearing assembly includes a wear-resistant plate seat fixedly connected to the top of the lower bearing seat through a circumferential fixing structure, a plurality of circumferentially distributed wear-resistant plates are provided on the upper end surface of the wear-resistant plate seat, and a graphite ring is fixed on the lower end surface of the rotor and is in active contact with the wear-resistant plate.

[0008] In some embodiments of the present application, a plurality of embedding recesses are provided on the upper surface of the wear-resistant plate seat, an embedding portion embedded in the embedding recesses is provided on the lower surface of the wear-resistant plate, and the embedding recesses and the embedding portion are fixedly connected.

[0009] In some embodiments of the present application, a circular arc convex surface is provided on the top of the lower bearing seat, and a circular arc concave surface is provided on the lower surface of the wear-resistant plate seat, and the circular arc convex surface and the circular arc concave surface match each other.

[0010] In some embodiments of the present application, the circumferential fixing structure includes a plurality of lower convex portions provided on the outer edge of the arc concave surface, and a plurality of notched grooves that are matched one-to-one with the lower convex portions are provided on the outer edge of the arc convex surface.

[0011] In some embodiments of the present application, the shell includes an outer barrel body and an inner barrel body located within the outer barrel body, a lower cover is provided between the lower end of the outer barrel body and the lower end of the inner barrel body, at least part of the lower bearing seat is fixed inside the lower cover, and an upper cover is provided between the upper end of the outer barrel body and the upper end of the inner barrel body, at least part of the upper bearing seat is fixed inside the upper cover.

[0012] In some embodiments of the present application, a shaft seal that is sleeved on the rotating shaft is fixed in the upper bearing seat, an annular groove is provided on the shaft seal that divides the shaft seal into an inner annular portion and an outer annular portion, a plurality of sealing lips are provided on the inner wall of the inner annular portion, and a tightening elastic ring is clamped on the outer wall of the inner annular portion, and the tightening elastic ring forces the sealing lips to always be in active contact with the outer cylindrical surface of the rotating shaft.

[0013] In some embodiments of the present application, a shaft outlet seat sleeved on the rotating shaft is fixed on the top of the upper bearing seat, and a shaft outlet protective sleeve sleeved on the rotating shaft is provided on the top of the shaft outlet seat, and a sealed space is formed internally between the shaft seal, the upper bearing seat and the shaft outlet seat.

[0014] In some embodiments of the present application, an annular rubber ring is provided on the top of the upper bearing seat, and a bearing seat cover is connected to the upper bearing seat through a detachable structure, the annular rubber ring is provided between the bearing seat cover and the top of the upper bearing seat, and the bearing seat cover is annular, the shaft outlet seat passes through the bearing seat cover, and the inner wall of the shaft outlet seat and the annular rubber ring are sealed and connected.

[0015] In some embodiments of the present application, the outer wall of the shaft seat has an outwardly extending annular contact portion, and the annular contact portion is located below at least a portion of the lower end surface of the bearing seat cover. When the annular rubber ring is locked and squeezed by the bearing seat cover in the thickness direction, the inner diameter of the annular rubber ring is reduced, and the annular contact portion and the annular rubber ring are sealed and relatively fixed.

[0016] Compared with the prior art, the beneficial effect of the present invention is that the present invention provides a bearing assembly between the top of the lower bearing seat and the lower end face of the rotor, at least part of the bearing assembly is fixedly connected to the circumferential direction of the lower bearing seat, and the remaining part is in movable contact with at least part of the rotor and fixed to the lower end face of the rotor. The bearing assembly is used to rotationally fix the rotor and provide support for the deep well water pump, thereby avoiding displacement or damage to the rotating shaft, thereby increasing the service life of the deep well water pump and improving the operating stability of the deep well water pump. Furthermore, by providing a stator installation space and a rotor installation space in the housing, an independent installation and sealed environment is provided for the stator and rotor, ensuring that the stator and rotor can be correctly placed and operated. At the same time, the stator and rotor each have independent spaces, avoiding friction losses caused by mechanical contact, and helping to improve the stability and efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0018] Figure 1 A schematic diagram of the three-dimensional structure of a deep well water pump provided by an embodiment of the present invention;

[0019] Figure 2 The embodiment of the present invention provides Figure 1 Cross-sectional view in the AA direction;

[0020] Figure 3 The embodiment of the present invention provides Figure 2 A magnified view of the structure at position Ⅰ in the middle;

[0021] Figure 4 The embodiment of the present invention provides Figure 2 A magnified view of the structure at center Ⅱ;

[0022] Figure 5 An exploded view of a drive motor provided by an embodiment of the present invention;

[0023] Figure 6 A schematic structural diagram of a lower bearing seat provided in an embodiment of the present invention;

[0024] Figure 7 Schematic diagram of the three-dimensional structure of the wear-resistant plate seat provided in the embodiment of the present invention Figure 1 ;

[0025] Figure 8 Schematic diagram of the three-dimensional structure of the wear-resistant plate seat provided in the embodiment of the present invention Figure 2 ;

[0026] Figure 9 A schematic diagram of the three-dimensional structure of a shaft seal provided in an embodiment of the present invention;

[0027] Figure 10 A schematic diagram of the three-dimensional structure of a wear-resistant sheet provided in an embodiment of the present invention.

[0028] In the figure: 1. Pump housing; 11. Water inlet; 12. Water outlet; 2. Impeller assembly; 3. Drive motor;

[0029] 31. Housing; 311. Outer barrel; 312. Inner barrel; 313. Stator mounting space; 314. Rotor mounting space; 32. Stator; 33. Rotor; 4. Rotating shaft; 41. Lower bearing seat; 4101. Arc convex surface; 4102. Notched groove; 42. Upper bearing seat; 423. Annular rubber ring; 43. Bearing assembly; 431. Wear-resistant plate seat; 4311. Embedded recess; 4312. Arc concave surface; 4313. Lower convex portion; 432. Wear-resistant plate; 43 21. Embedded part; 433. Graphite ring; 44. Lower cover; 45. Upper cover; 451. One-way valve; 452. Filter disc; 46. Shaft seal; 461. Annular groove; 462. Inner annular part; 463. Outer annular part; 464. Tightening elastic ring; 465. Sealing lip; 47. Shaft seat; 471. Annular contact part; 48. Shaft protection sleeve; 49. Bearing seat cover; 410. Lower bearing cover; 411. Diaphragm cover; 412. Screw; 413. Shaft movement limiter. DETAILED DESCRIPTION

[0030] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, unless there is a conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0031] See Figure 1-Figure 3As shown, the deep well water pump provided in this embodiment includes a pump housing 1, a water inlet 11 is provided in the middle of the pump housing 1, and a water outlet 12 is provided at the top of the pump housing 1, an impeller group 2 is provided in the pump housing 1, and the impeller group 2 is connected to the drive motor 3, the drive motor 3 includes a housing 31 having a stator installation space 313 and a rotor installation space 314, the stator 32 of the drive motor 3 is fixed to the stator installation space 313, the rotor 33 of the drive motor 3 is in the rotor installation space 314, and a lower bearing is provided at the lower end of the housing 31 Seat 41, an upper bearing seat 42 is provided at the upper end of the shell 31, the lower bearing seat 41 and the upper bearing seat 42 are respectively rotatably connected to the rotating shaft 4, and a bearing assembly 43 is provided between the top of the lower bearing seat 41 and the lower end surface of the rotor 33, at least part of the bearing assembly 43 is circumferentially fixedly connected to the lower bearing seat 41, and the remaining part of the bearing assembly 43 is in movably contact with at least part of the bearing assembly 43 and is fixed to the lower end surface of the rotor 33, and a shaft movement limiter 413 is provided on the rotating shaft 4 between the upper bearing seat 42 and the upper end of the rotor 33.

[0032] It can be understood that the drive motor 3 in this embodiment provides power for the impeller assembly 2, which drives the impeller assembly 2 to rotate and generates centrifugal force to push water from the water inlet 11 to the water outlet 12. The stator installation space 313 and the rotor installation space 314 are set in the housing 31 of the drive motor 3 to ensure the efficient operation of the drive motor 3. At the same time, the independent stator installation space 313 and the rotor installation space 314 shorten the heat conduction path between the stator 32 and the rotor 33, avoid the stator 32 from being affected by the rotor 33, help to dissipate heat more effectively, and improve maintenance and repair efficiency. There is no need to disassemble the drive motor 3 as a whole, which greatly saves maintenance time and cost. In addition, the upper bearing seat 42, the lower bearing seat 41, the bearing assembly 43 and the shaft limiter 413, while providing axial support and rotation fixation for the rotating shaft 4, limit the axial movement stroke of the rotating shaft 4, and ensure the stable and efficient operation of the deep well water pump.

[0033] Combine Figure 4-Figure 5 As shown, preferably, the bearing assembly 43 includes a wear-resistant plate seat 431 fixedly connected to the top of the lower bearing seat 41 through a circumferential fixing structure, a plurality of circumferentially distributed wear-resistant plates 432 are provided on the upper end surface of the wear-resistant plate seat 431, and a graphite ring 433 is fixed on the lower end surface of the rotor 33 to be in active contact with the wear-resistant plate 432.

[0034] It is understandable that in this embodiment, by providing a wear-resistant plate seat 431 and a wear-resistant plate 432, the friction coefficient between the bearing assembly 43 and the lower bearing seat 41 is reduced, thereby ensuring the smooth operation of the drive motor 3 and extending the service life. At the same time, the wear-resistant plate seat 431 and the lower bearing seat 41 are connected by a circumferential fixed structure, which ensures the axial bearing capacity of the bearing assembly 43 on the drive motor 3 and avoids the displacement of the drive motor 3 during operation. In addition, by providing a graphite ring 433 that is in active contact with the wear-resistant plate 432 on the lower end face of the rotor 33, the conductive properties of graphite can effectively prevent the accumulation of static electricity and ensure stable current transmission. Furthermore, graphite has good lubricating properties, which can reduce the friction between the rotor 33 and the wear-resistant plate 432, reduce the cost of inspection and maintenance, and extend the service life of the drive motor 3.

[0035] Combine Figure 7-Figure 8 As shown, preferably, a plurality of embedding recesses 4311 are provided on the upper surface of the wear-resistant plate seat 431, an embedding portion 4321 embedded in the recesses 4311 is provided on the lower surface of the wear-resistant plate 432, and the embedding recesses 4311 and the embedding portion 4321 are fixedly connected.

[0036] Specifically, the embedding recess 4311 and the embedding portion 4321 can be reinforced by dispensing glue to achieve a firm connection between the wear-resistant sheet 432 and the wear-resistant sheet seat 431, ensuring that the wear-resistant sheet 432 will not fall off during operation.

[0037] Combine Figure 5 and Figure 10 As shown, specifically, the wear-resistant sheets 432 can be arranged as three evenly distributed sheets to form a stable triangular structure, effectively dispersing pressure and friction.

[0038] It can be understood that in this embodiment, by providing a number of mutually cooperating embedding recesses 4311 and embedding portions 4321 on the wear-resistant plate 432 and the wear-resistant plate seat 431, and reinforcing them through glue dotting, the wear-resistant plate 432 is firmly installed, thereby avoiding operation problems of the drive motor 3 caused by the wear-resistant plate 432 falling off.

[0039] Combine Figure 6 As shown, preferably, an arc convex surface 4101 is provided on the top of the lower bearing seat 41, and an arc concave surface 4312 is provided on the lower surface of the wear-resistant plate seat 431, and the arc convex surface 4101 and the arc concave surface 4312 match each other.

[0040] Specifically, the area of ​​the arc convex surface 4101 of the lower bearing seat 41 is larger than the area of ​​the arc concave surface 4312 of the wear-resistant plate seat 431. Since the lower bearing seat 41 is mainly used to provide axial bearing capacity, the larger arc area can disperse stress and reduce local pressure, thereby improving the stability and reliability of the connection.

[0041] It can be understood that in this embodiment, the lower bearing seat 41 and the wear-resistant plate seat 431 are matched through the arc surface structure to provide a smooth transition and reduce stress concentration, thereby ensuring that the lower bearing seat 41 can be evenly stressed and extending its service life.

[0042] Preferably, the circumferential fixing structure includes a plurality of lower convex portions 4313 provided on the outer edge of the arc concave surface 4312 , and a plurality of notched grooves 4102 that are matched one-to-one with the lower convex portions 4313 are provided on the outer edge of the arc convex surface 4101 .

[0043] It can be understood that in this embodiment, the circumferential fixation of the lower bearing seat 41 and the wear-resistant plate seat 431 is achieved through the cooperation of the lower protrusion 4313 and the notch groove 4102. The setting of the notch groove 4102 can make the lower protrusion 4313 better embedded. At the same time, it is easy to disassemble and install during maintenance, reducing the difficulty and time of assembly.

[0044] Combine Figure 2 and Figure 5 As shown, preferably, the shell 31 includes an outer barrel body 311 and an inner barrel body 312 located in the outer barrel body 311, a lower cover 44 is provided between the lower end of the outer barrel body 311 and the lower end of the inner barrel body 312, at least part of the lower bearing seat 41 is fixed inside the lower cover 44, and an upper cover 45 is provided between the upper end of the outer barrel body 311 and the upper end of the inner barrel body 312, at least part of the upper bearing seat 42 is fixed inside the upper cover 45.

[0045] Specifically, a lower bearing cover 410 is installed at the bottom of the lower bearing seat 41. A diaphragm cover 411 is installed between the lower bearing cover 410 and the lower bearing seat 41. The lower bearing cover 410, diaphragm cover 411, and lower bearing seat 41 are fixedly connected to the lower cover 44 via screws 412. The diaphragm cover 411 isolates the connection space between the lower bearing seat 41 and the rotating shaft 4 into a sealed space, preventing water ingress and enhancing waterproof performance. Furthermore, the screw connection 412 allows for quick disassembly and assembly, reducing installation and maintenance time.

[0046] It can be understood that in this embodiment, by fixing the lower bearing seat 41 and the upper bearing seat 42 to the inside of the lower cover 44 and the upper cover 45 of the shell 31 respectively, the drive motor 3 is axially confined to the inside of the shell 31, reducing the risk of movement of the bearing seat due to vibration or impact, thereby ensuring the stable operation of the drive motor 3.

[0047] Combine Figure 3 and Figure 9As shown, preferably, a shaft seal 46 which is sleeved on the rotating shaft 4 is fixed in the upper bearing seat 42, and an annular groove 461 is provided on the shaft seal 46 to divide the shaft seal 46 into an inner annular portion 462 and an outer annular portion 463, a plurality of sealing lips 465 are provided on the inner wall of the inner annular portion 462, and a tightening elastic ring 464 is clamped on the outer wall of the inner annular portion 462, and the tightening elastic ring 464 forces the sealing lips 465 to always be in active contact with the outer cylindrical surface of the rotating shaft 4.

[0048] Specifically, an upper positioning step is provided on the upper end of the inner wall of the upper bearing seat 42 , and the shaft seal 46 is fixed on the upper positioning step.

[0049] Specifically, the tightening elastic ring 464 is, for example, a rubber ring or the like.

[0050] Specifically, combined Figure 5 As shown, a one-way valve 451 and a filter 452 are provided in the upper bearing seat 42 to discharge the water from the housing 31 when water enters the housing 31 of the drive motor 3 to avoid affecting the normal operation of the drive motor 3.

[0051] It will be appreciated that the shaft seal 46 in this embodiment is used to ensure the normal operation and performance of the drive motor 3 and to prevent contamination and damage to the interior of the drive motor 3. The shaft seal 46 is divided into an inner annular portion 462 and an outer annular portion 463 by an annular groove 461, which helps optimize sealing performance. In addition, since a plurality of sealing lips 465 are provided on the inner wall of the inner annular portion 462, the sealing lips 465 automatically embrace the outer cylindrical surface of the rotating shaft 4 after being subjected to pressure from the tightening elastic ring 464, further increasing the contact surface and improving sealing performance. The continuous pressure of the tightening elastic ring 464 ensures that the sealing lips 465 always maintain close contact with the rotating shaft 4, and the sealing lips 465 can effectively seal even when the rotating shaft 4 is rotating.

[0052] Combine Figure 3 and Figure 5 As shown, preferably, a shaft outlet seat 47 sleeved on the rotating shaft 4 is fixed on the top of the upper bearing seat 42, and a shaft outlet protection sleeve 48 sleeved on the rotating shaft 4 is provided on the top of the shaft outlet seat 47, and a sealed space is formed internally between the shaft seal 46, the upper bearing seat 42 and the shaft outlet seat 47.

[0053] It will be appreciated that in this embodiment, the shaft outlet seat 47 further secures and supports the rotating shaft 4, and the shaft outlet protective sleeve 48 is sleeved over the end of the rotating shaft 4 to prevent the ingress of dust, moisture, or other impurities. The shaft seal 46, the upper bearing seat 42, and the shaft outlet seat 47 together form a sealed space to ensure the normal operation of the drive motor 3.

[0054] Preferably, an annular rubber ring 423 is provided at the top of the upper bearing seat 42, as well as a bearing seat cover 49 connected to the upper bearing seat 42 via a detachable structure. The annular rubber ring 423 is provided between the bearing seat cover 49 and the top of the upper bearing seat 42. The bearing seat cover 49 is annular, and the shaft seat 47 passes through the bearing seat cover 49. The shaft seat 47 and the inner wall of the annular rubber ring 423 are sealed. An outwardly extending annular contact portion 471 is provided on the outer wall of the shaft seat 47. The annular contact portion 471 is located below at least a portion of the lower end surface of the bearing seat cover 49. When the annular rubber ring 423 is locked and squeezed by the bearing seat cover 49 in the thickness direction, the inner diameter of the annular rubber ring 423 is reduced, and the annular contact portion 471 and the annular rubber ring 423 are sealed and fixed relative to each other.

[0055] Specifically, a sealing ring is provided between the upper bearing seat 42 and the upper cover 45 .

[0056] It can be understood that in this embodiment, the bearing seat cover 49 is detachably connected to the upper bearing seat 42, and an annular rubber ring 423 is provided between the bearing seat cover 49 and the upper bearing seat 42. The annular rubber ring 423 is sleeved on the outer side of the shaft seat 47, and the annular contact portion 471 and or at least part of the side wall of the annular rubber ring 423 are in contact with each other. When the annular rubber ring 423 is squeezed and deformed, the annular rubber ring 423 forms a seal with the annular contact portion 471 of the shaft seat 47 and is relatively fixed.

[0057] Furthermore, since a shaft protection sleeve 48 is provided on the top of the shaft seat 47, a seal is formed at the end of the rotating shaft 4 by the shaft protection sleeve 48, and the shaft seal 46 forms a seal between the top of the upper bearing seat 42 and the rotating shaft 4. The shaft seat 47 is arranged below the shaft protection sleeve 48, and the bearing seat cover 49 is arranged on the upper bearing seat 42 through a detachable structure. An annular rubber ring 423 is provided on the top of the bearing seat cover 49 and the upper bearing seat 42. When the annular rubber ring 423 is squeezed and deformed, the annular rubber ring 423 forms a seal with the annular contact portion 471 of the shaft seat 47 and is relatively fixed, thereby forming a sealed space between the shaft seal 46, the upper bearing seat 42 and the shaft seat 47.

[0058] It can be understood that in this embodiment, an annular rubber ring 423 is provided between the upper bearing seat 42 and the bearing seat cover 49, a detachable structure is used to achieve convenient maintenance, and the sealing effect is enhanced by the annular contact portion 471, thereby ensuring efficient operation and long-term stability of the drive motor 3.

[0059] The working principle of this embodiment is as follows:

[0060] The deep-well water pump is placed underwater, and the drive motor 3 rotates the impeller assembly 2 via the rotating shaft 4. The high-speed rotation of the impeller assembly 2 creates a vacuum, drawing water in through the central water inlet 11 and using centrifugal force to transport the water to the water outlet 12 for discharge. During operation of the drive motor 3, the upper bearing seat 42, lower bearing seat 41, bearing assembly 43, and shaft travel limiter 413 provide axial support and rotational fixation for the rotating shaft 4, while also limiting its axial travel, ensuring stable and efficient operation of the deep-well water pump.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A deep well water pump, comprising a pump housing (1), a water inlet (11) provided in the middle of the pump housing (1), a water outlet (12) provided at the top of the pump housing (1), an impeller assembly (2) provided in the pump housing (1), and the impeller assembly (2) connected to a drive motor (3), characterized in that: The drive motor (3) comprises a housing (31) having a stator mounting space (313) and a rotor mounting space (314); the stator (32) of the drive motor (3) is fixed to the stator mounting space (313); the rotor (33) of the drive motor (3) is located in the rotor mounting space (314); a lower bearing seat (41) is provided at the lower end of the housing (31); an upper bearing seat (42) is provided at the upper end of the housing (31); the lower bearing seat (41) and the upper bearing seat (42) are respectively connected to the rotating shaft ( 4) a rotational connection, wherein a bearing assembly (43) is provided between the top of the lower bearing seat (41) and the lower end surface of the rotor (33), at least a portion of the bearing assembly (43) is circumferentially fixedly connected to the lower bearing seat (41), and the remaining portion of the bearing assembly (43) is in movable contact with at least a portion of the bearing assembly (43) and is fixed to the lower end surface of the rotor (33), and a shaft movement limiting member (413) is provided on the rotating shaft (4) and is located between the upper bearing seat (42) and the upper end of the rotor (33); The housing (31) comprises an outer barrel (311) and an inner barrel (312) located within the outer barrel (311); a lower cover (44) is provided between the lower end of the outer barrel (311) and the lower end of the inner barrel (312); at least a portion of the lower bearing seat (41) is fixed inside the lower cover (44); an upper cover (45) is provided between the upper end of the outer barrel (311) and the upper end of the inner barrel (312); at least a portion of the upper bearing seat (42) is fixed inside the upper cover (45); a shaft outlet seat (42) sleeved on the rotating shaft (4) is fixed on the top of the upper bearing seat (42); 47), and a shaft protection sleeve (48) sleeved on the rotating shaft (4) is provided on the top of the shaft seat (47); an annular rubber ring (423) is provided on the top of the upper bearing seat (42), and a bearing seat cover (49) connected to the upper bearing seat (42) through a detachable structure, the annular rubber ring (423) is provided between the bearing seat cover (49) and the top of the upper bearing seat (42), and the bearing seat cover (49) is annular, the shaft seat (47) passes through the bearing seat cover (49), and the inner wall of the shaft seat (47) and the annular rubber ring (423) are sealed; An outwardly extending annular contact portion (471) is provided on the outer wall of the shaft seat (47), and the annular contact portion (471) is located below at least a portion of the lower end surface of the bearing seat cover (49). The annular contact portion (471) and at least a portion of the side wall of the annular rubber ring (423) are in contact with each other. When the annular rubber ring (423) is locked and squeezed in the thickness direction by the bearing seat cover (49), the inner diameter of the annular rubber ring (423) is reduced, and the annular contact portion (471) and the annular rubber ring (423) are sealed and fixed relative to each other.

2. The deep well water pump according to claim 1, characterized in that: The bearing assembly (43) includes a wear-resistant plate seat (431) fixedly connected to the top of the lower bearing seat (41) through a circumferential fixing structure, a plurality of wear-resistant plates (432) distributed in a circumferential manner are provided on the upper end surface of the wear-resistant plate seat (431), and a graphite ring (433) is fixed on the lower end surface of the rotor (33) and is in active contact with the wear-resistant plates (432).

3. The deep well water pump according to claim 2, characterized in that: A plurality of embedding recesses (4311) are provided on the upper surface of the wear-resistant plate seat (431), an embedding portion (4321) embedded in the embedding recesses (4311) is provided on the lower surface of the wear-resistant plate (432), and the embedding recesses (4311) and the embedding portion (4321) are fixedly connected.

4. The deep well water pump according to claim 2, characterized in that: A circular arc convex surface (4101) is provided on the top of the lower bearing seat (41), and a circular arc concave surface (4312) is provided on the lower surface of the wear-resistant plate seat (431), and the circular arc convex surface (4101) and the circular arc concave surface (4312) match each other.

5. The deep well water pump according to claim 4, characterized in that: The circumferential fixing structure includes a plurality of lower convex portions (4313) provided on the outer edge of the arc concave surface (4312), and a plurality of notched grooves (4102) are provided on the outer edge of the arc convex surface (4101) and are matched one-to-one with the lower convex portions (4313).

6. The deep well water pump according to claim 1, characterized in that: A shaft seal (46) sleeved on the rotating shaft (4) is fixed in the upper bearing seat (42), and an annular groove (461) is provided on the shaft seal (46) for dividing the shaft seal (46) into an inner annular portion (462) and an outer annular portion (463). A plurality of sealing lips (465) are provided on the inner wall of the inner annular portion (462), and a tightening elastic ring (464) is provided on the outer wall of the inner annular portion (462). The tightening elastic ring (464) forces the sealing lips (465) to always be in active contact with the outer cylindrical surface of the rotating shaft (4).

7. The deep well water pump according to claim 6, characterized in that: A sealed space is formed internally between the shaft seal (46), the upper bearing seat (42) and the shaft outlet seat (47).

Images