Deep well water pump

Abstract

The invention relates to the technical field of water pumps, in particular to a deep well water pump which comprises a pump shell, a water inlet, a water outlet, an impeller set and a driving motor are arranged on the pump shell, the driving motor comprises a shell with a stator installation space and a rotor installation space, a lower bearing seat is arranged at the lower end of the shell, and an upper bearing seat is arranged at the upper end of the shell. The lower bearing seat and the upper bearing seat are rotationally connected with the rotating shaft, a bearing assembly is arranged 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 with the lower bearing seat in the circumferential direction, and the rest part of the bearing assembly is movably contacted with at least part of the bearing assembly and is fixed to the lower end face of the rotor; the rotating shaft is provided with a shaft movement limiting piece located between the upper bearing seat and the upper end of the rotor. The rotor is rotationally fixed through the bearing assembly, supporting force is provided for the deep well water pump, the rotating shaft is prevented from deviating or being damaged, and then the service life of the deep well water pump is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of water pumps, and more particularly to deep well water pumps. Background Art

[0002] The biggest feature of a deep well water pump is that the motor and the pump are integrated into one. It is a pump that is immersed in a groundwater well for sucking and transporting water, and is widely used in farmland drainage and irrigation, industrial and mining enterprises, urban water supply and drainage, and sewage treatment, etc. The working principle of a deep well water pump is that the motor drives the pump shaft to rotate, which in turn drives the impeller to rotate at a high speed, sucking water from the bottom of the well to the ground.

[0003] In a deep well water pump, due to the pressure of groundwater and the weight of the pump shaft, axial forces will be generated, and these forces need to be borne by bearings to ensure that the pump shaft will not shift or be damaged due to excessive axial forces. In this process, the prior art usually uses ball bearings to rotationally fix and support the pump shaft for the rotor, so that the pump shaft can be stable axially and at the same time allows free rotation.

[0004] However, for the rotating shaft of the existing deep well water pump, the bearing parts used need to bear the rotor and the impeller connected to the rotating shaft. The bearing method used will increase the frictional force during 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 by the present invention aims to solve the problems existing in the current technology.

[0006] The present invention provides a deep well water pump, including a pump housing. An inlet is provided in the middle of the pump housing, and an outlet is provided at the top of the pump housing. An impeller group is provided in the pump housing, and the impeller group is connected to a driving motor. The driving motor includes a housing having a stator installation space and a rotor installation space. The stator of the driving motor is fixed in the stator installation space, and the rotor of the driving motor is located in the rotor installation space. A lower bearing seat is provided at the lower end of the housing, and an upper bearing seat is provided at the upper end of the housing. The lower bearing seat and the upper bearing seat are respectively rotationally connected to a rotating shaft. A bearing component is provided between the top of the lower bearing seat and the lower end face of the rotor. At least a part of the bearing component is circumferentially fixedly connected to the lower bearing seat, and the remaining part of the bearing component is in movable contact with at least a part of the bearing component and is fixed to the lower end face of the rotor. An axial displacement limiting member is 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 piece seat fixedly connected to the top of the lower bearing seat through a circumferential fixing structure. A plurality of wear-resistant pieces are arranged on the upper end surface of the wear-resistant piece seat in a circumferential distribution, and a graphite ring in movable contact with the wear-resistant pieces is fixed to the lower end surface of the rotor.

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

[0009] In some embodiments of the present application, an arc convex surface is provided on the top of the lower bearing seat, an arc concave surface is provided on the lower surface of the wear-resistant piece seat, and the arc convex surface and the 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 notch grooves paired with the lower convex portions one by one are provided on the outer edge of the arc convex surface.

[0011] In some embodiments of the present application, the housing includes an outer barrel body and an inner barrel body located inside 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. 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 member sleeved on the rotating shaft is fixed inside the upper bearing seat. An annular groove that divides the shaft seal member into an inner annular portion and an outer annular portion is provided on the shaft seal member. A plurality of sealing lips are provided on the inner wall of the inner annular portion, and a tightening elastic ring is hoop-mounted on the outer wall of the inner annular portion. The tightening elastic ring forces the sealing lips to always be in movable contact with the outer cylindrical surface of the rotating shaft.

[0013] In some embodiments of the present application, an output shaft seat sleeved on the rotating shaft is fixed to the top of the upper bearing seat, and an output shaft protective sleeve sleeved on the rotating shaft is provided on the top of the output shaft seat. A sealed space is formed inside among the shaft seal member, the upper bearing seat, and the output shaft 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 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. The bearing seat cover is annular. The output shaft seat penetrates through the bearing seat cover, and the output shaft seat is hermetically connected to the inner wall of the annular rubber ring.

[0015] In some embodiments of the present application, an annular contact portion extending outward is provided on the outer wall of the output shaft seat, and the annular contact portion is located below at least a part 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 to each other.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows. A bearing assembly is provided between the top of the lower bearing seat and the lower end surface of the rotor. At least a part of the bearing assembly is circumferentially fixedly connected to the lower bearing seat, and the remaining part is in movable contact with at least a part and fixed to the lower end surface of the rotor. The rotor is rotationally fixed by the bearing assembly and a supporting force is provided for the deep well pump, avoiding the offset or damage of the rotating shaft, thereby improving the service life of the deep well pump and the operating stability of the deep well pump. Further, 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 the rotor, ensuring that the stator and the rotor can be correctly placed and operated. At the same time, the stator and the rotor each have an independent space, avoiding frictional losses caused by mechanical contact, which helps to improve the stability and efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings: Figure 1 is a perspective structural view of the deep well pump provided by the embodiment of the present invention; Figure 2 provided by the embodiment of the present invention Figure 1 is a cross-sectional view in the A-A direction; Figure 3 provided by the embodiment of the present invention Figure 2 is an enlarged view of the structure at I in the figure; Figure 4 provided by the embodiment of the present invention Figure 2 is an enlarged view of the structure at II in the figure; Figure 5 is an exploded view of the drive motor provided by the embodiment of the present invention; Figure 6 is a structural view of the lower bearing seat provided by the embodiment of the present invention; Figure 7 is a perspective structural schematic diagram of the wear-resistant piece seat provided by the embodiment of the present invention Figure 1 ; Figure 8Schematic three-dimensional structure of the wear-resistant piece seat provided by the embodiment of the present invention Figure 2 ; Figure 9 Schematic three-dimensional structure diagram of the shaft seal provided by the embodiment of the present invention; Figure 10 Schematic three-dimensional structure diagram of the wear-resistant piece provided by the embodiment of the present invention.

[0018] In the figure: 1, pump housing; 11, water inlet; 12, water outlet; 2, impeller group; 3, drive motor; 31, housing; 311, outer barrel body; 312, inner barrel body; 313, stator installation space; 314, rotor installation space; 32, stator; 33, rotor; 4, rotating shaft; 41, lower bearing seat; 4101, arc convex surface; 4102, notch groove; 42, upper bearing seat; 423, annular rubber ring; 43, bearing assembly; 431, wear-resistant piece seat; 4311, embedding concave position; 4312, arc concave surface; 4313, lower convex part; 432, wear-resistant piece; 4321, embedding part; 433, graphite ring; 44, lower cover; 45, upper cover; 451, one-way valve; 452, filter sheet; 46, shaft seal; 461, annular groove; 462, inner annular part; 463, outer annular part; 464, tightening elastic ring; 465, sealing lip; 47, output shaft seat; 471, annular contact part; 48, output shaft protective sleeve; 49, bearing seat cover; 410, bearing cover lower; 411, diaphragm cover; 412, screw; 413, shaft axial displacement limiting part. Detailed implementation manners

[0019] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the 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 so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be completely conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention 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 drawings and in conjunction with the embodiments.

[0020] Refer to Figures 1 - 3As shown in the figure, the deep-well water pump provided in this embodiment includes a pump housing 1. An inlet 11 is provided in the middle of the pump housing 1, and an 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 a driving motor 3. The driving motor 3 includes a housing 31 having a stator installation space 313 and a rotor installation space 314. The stator 32 of the driving motor 3 is fixed in the stator installation space 313, and the rotor 33 of the driving motor 3 is located in the rotor installation space 314. A lower bearing seat 41 is provided at the lower end of the housing 31, and 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 rotationally connected to a rotating shaft 4. A bearing assembly 43 is provided between the top of the lower bearing seat 41 and the lower end face of the rotor 33. At least a 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 movable contact with at least a part of the bearing assembly 43 and is fixed to the lower end face of the rotor 33. An axial displacement limiting member 413 is provided on the rotating shaft 4 between the upper bearing seat 42 and the upper end of the rotor 33.

[0021] It can be understood that the driving motor 3 in this embodiment provides power for the impeller group 2, and generates a centrifugal force by driving the impeller group 2 to rotate to push water from the inlet 11 to the outlet 12. By providing the stator installation space 313 and the rotor installation space 314 in the housing 31 of the driving motor 3, the efficient operation of the driving motor 3 is ensured. At the same time, the mutually independent stator installation space 313 and rotor installation space 314 shorten the heat conduction path between the stator 32 and the rotor 33, avoiding the influence of the rotor 33 on the stator 32, which helps to dissipate heat more effectively. At the same time, the maintenance and repair efficiency are improved. There is no need to disassemble the driving 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 axial displacement limiting member 413 provide axial support and rotational fixation for the rotating shaft 4 while restricting the axial movement stroke of the rotating shaft 4, ensuring the stable and efficient operation of the deep-well water pump.

[0022] Combined with Figures 4 - 5 As shown in the figure, preferably, the bearing assembly 43 includes a wear-resistant piece seat 431 fixedly connected to the top of the lower bearing seat 41 through a circumferential fixing structure. A plurality of wear-resistant pieces 432 distributed in a circle are provided on the upper end face of the wear-resistant piece seat 431, and a graphite ring 433 in movable contact with the wear-resistant pieces 432 is fixed to the lower end face of the rotor 33.

[0023] It can be understood that in this embodiment, by providing the wear-resistant piece seat 431 and the wear-resistant piece 432, the friction coefficient between the bearing assembly 43 and the lower bearing seat 41 is reduced, ensuring the stable operation of the drive motor 3 and extending its service life. At the same time, the wear-resistant piece seat 431 and the lower bearing seat 41 are connected by a circumferential fixing structure, ensuring the axial bearing capacity of the bearing assembly 43 for the drive motor 3 and preventing the drive motor 3 from shifting during operation. In addition, by providing a graphite ring 433 in contact with the wear-resistant piece 432 on the lower end face of the rotor 33, the conductive property of graphite can effectively prevent static electricity accumulation and ensure stable current transmission. Further, graphite has good lubricating properties, which can reduce the friction between the rotor 33 and the wear-resistant piece 432, reduce the maintenance cost, and extend the service life of the drive motor 3.

[0024] Combined with Figures 7 - 8 As shown, preferably, a plurality of embedding recesses 4311 are provided on the upper surface of the wear-resistant piece seat 431, an embedding portion 4321 corresponding to the embedding recesses 4311 is provided on the lower surface of the wear-resistant piece 432, and the embedding recesses 4311 and the embedding portion 4321 are fixedly connected.

[0025] Specifically, the embedding recesses 4311 and the embedding portion 4321 can be reinforced by dispensing glue to achieve a firm combination between the wear-resistant piece 432 and the wear-resistant piece seat 431, ensuring that the wear-resistant piece 432 does not fall off during operation.

[0026] Combined with Figure 5 and Figure 10 As shown, specifically, the wear-resistant piece 432 can be provided as three evenly distributed pieces, forming a stable triangular structure to effectively disperse pressure and friction.

[0027] It can be understood that in this embodiment, by providing a plurality of mutually cooperating embedding recesses 4311 and embedding portions 4321 on the wear-resistant piece 432 and the wear-resistant piece seat 431, and reinforcing them by dispensing glue, the stable installation of the wear-resistant piece 432 is achieved, avoiding problems in the operation of the drive motor 3 caused by the falling off of the wear-resistant piece 432.

[0028] Combined with 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 piece seat 431, and the arc convex surface 4101 and the arc concave surface 4312 are mutually matched.

[0029] 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 piece 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.

[0030] It can be understood that in this embodiment, the lower bearing seat 41 and the wear-resistant piece seat 431 are fitted through an arc surface structure to provide a smooth transition, reduce stress concentration, ensure that the lower bearing seat 41 can be evenly stressed, and extend the service life.

[0031] Preferably, the circumferential fixing structure includes a number of lower convex portions 4313 provided on the outer edge of the arc concave surface 4312, and a number of notch grooves 4102 paired with the lower convex portions 4313 one by one are provided on the outer edge of the arc convex surface 4101.

[0032] It can be understood that in this embodiment, through the cooperation of the lower convex portion 4313 and the notch groove 4102, the circumferential fixation of the lower bearing seat 41 and the wear-resistant piece seat 431 is achieved. The setting of the notch groove 4102 can enable the lower convex portion 4313 to be better embedded. At the same time, it is convenient for disassembly and installation during maintenance, reducing the assembly difficulty and time.

[0033] Combined Figure 2 and Figure 5 As shown, preferably, the housing 31 includes an outer barrel body 311 and an inner barrel body 312 located inside 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. 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.

[0034] Specifically, a lower bearing cover 410 is provided at the bottom of the lower bearing seat 41. A diaphragm cover 411 is provided between the lower bearing cover 410 and the lower bearing seat 41. The lower bearing cover 410, the diaphragm cover 411 and the lower bearing seat 41 are fixedly connected to the lower cover 44 by screws 412. At this time, the diaphragm cover 411 isolates the connection space between the lower bearing seat 41 and the rotating shaft 4 into a closed space, preventing water from entering and enhancing the waterproof performance. At the same time, the screw 412 connection allows for quick disassembly and assembly, reducing the installation and maintenance time.

[0035] It can be understood that in this embodiment, by fixing the lower bearing seat 41 and the upper bearing seat 42 inside the lower cover 44 and the upper cover 45 of the housing 31 respectively, the drive motor 3 is axially limited inside the housing 31, reducing the risk of the bearing seat moving due to vibration or impact, thereby ensuring the stable operation of the drive motor 3.

[0036] Combined Figure 3 and Figure 9As shown, preferably, a shaft seal member 46 sleeving on the rotating shaft 4 is fixed inside the upper bearing housing 42. A circular groove 461 is formed on the shaft seal member 46 to divide the shaft seal member 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 hoop-mounted 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.

[0037] Specifically, an upper positioning step is provided at the upper end of the inner wall of the upper bearing housing 42, and the shaft seal member 46 is fixed to the upper positioning step.

[0038] Specifically, the tightening elastic ring 464 is, for example, a rubber ring or the like.

[0039] Specifically, in combination with Figure 5 As shown, a check valve 451 and a filter element 452 are provided inside the upper bearing housing 42 for draining water from the inside of the housing 31 of the drive motor 3 when water enters the inside of the housing 31, so as to avoid affecting the normal operation of the drive motor 3.

[0040] It can be understood that the shaft seal member 46 in this embodiment is used to ensure the normal operation and performance of the drive motor 3, and prevent the inside of the drive motor 3 from being contaminated and damaged. The shaft seal member 46 is divided into an inner annular portion 462 and an outer annular portion 463 by the circular groove 461, which helps to optimize the 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 hold the outer cylindrical surface of the rotating shaft 4 tightly after being pressed by the tightening elastic ring 464, further increasing the contact surface and improving the sealing performance. The continuous pressure of the tightening elastic ring 464 keeps the sealing lips 465 always in close contact with the rotating shaft 4. Even when the rotating shaft 4 rotates, the sealing lips 465 can effectively seal.

[0041] In combination with Figure 3 and Figure 5 As shown, preferably, an output shaft seat 47 sleeving on the rotating shaft 4 is fixed to the top of the upper bearing housing 42, and an output shaft protective sleeve 48 sleeving on the rotating shaft 4 is provided at the top of the output shaft seat 47. A sealed space is formed inside between the shaft seal member 46, the upper bearing housing 42 and the output shaft seat 47.

[0042] It can be understood that in this embodiment, the output shaft seat 47 further fixes and supports the rotating shaft 4, and the output shaft protective sleeve 48 sleeving on the end of the rotating shaft 4 is used to prevent dust, water or other impurities from entering. A sealed space is jointly formed among the shaft seal member 46, the upper bearing housing 42 and the output shaft seat 47 to ensure the normal operation of the drive motor 3.

[0043] Preferably, an annular rubber ring 423 is provided on the top of the upper bearing housing 42, and a bearing housing cover 49 is connected to the upper bearing housing 42 through a detachable structure. The annular rubber ring 423 is disposed between the bearing housing cover 49 and the top of the upper bearing housing 42, and the bearing housing cover 49 is annular. The output shaft seat 47 passes through the bearing housing cover 49, and the output shaft seat 47 is hermetically connected to the inner wall of the annular rubber ring 423. An annular contact portion 471 extending outward is provided on the outer wall of the output shaft seat 47. The annular contact portion 471 is located below at least a part of the lower end surface of the bearing housing cover 49. When the annular rubber ring 423 is locked and squeezed by the bearing housing cover 49 in the thickness direction, the inner diameter of the annular rubber ring 423 is reduced, so that the annular contact portion 471 and the annular rubber ring 423 are sealed and relatively fixed to each other.

[0044] Specifically, a sealing ring is provided between the upper bearing housing 42 and the upper cover 45.

[0045] It can be understood that in this embodiment, the bearing housing cover 49 is detachably connected to the upper bearing housing 42, and an annular rubber ring 423 is provided between the bearing housing cover 49 and the upper bearing housing 42. The annular rubber ring 423 is sleeved on the outer side of the output shaft seat 47, and at least part of the side wall of the annular contact portion 471 and / or the annular rubber ring 423 is in contact. When the annular rubber ring 423 is deformed by extrusion, a seal is formed between the annular rubber ring 423 and the annular contact portion 471 of the output shaft seat 47 and they are relatively fixed.

[0046] Further, since an output shaft protective sleeve 48 is sleeved on the top of the output shaft seat 47 to form a seal at the end of the rotating shaft 4, and the shaft seal 46 forms a seal between the top of the upper bearing housing 42 and the rotating shaft 4. The output shaft seat 47 is disposed below the output shaft protective sleeve 48, and the bearing housing cover 49 is disposed on the upper bearing housing 42 through a detachable structure. An annular rubber ring 423 is provided between the bearing housing cover 49 and the top of the upper bearing housing 42. When the annular rubber ring 423 is deformed by extrusion, a seal is formed between the annular rubber ring 423 and the annular contact portion 471 of the output shaft seat 47 and they are relatively fixed. Thus, a sealed space is jointly formed among the shaft seal 46, the upper bearing housing 42 and the output shaft seat 47.

[0047] It can be understood that in this embodiment, by providing the annular rubber ring 423 between the upper bearing housing 42 and the bearing housing cover 49, convenient maintenance is realized by using a detachable structure, and the sealing effect is enhanced through the annular contact portion 471, ensuring the efficient operation and long-term stability of the drive motor 3.

[0048] The working principle of this embodiment is as follows: Put the deep well pump underwater. The drive motor 3 drives the impeller group 2 to rotate through the rotating shaft 4. The high-speed rotation of the impeller group 2 forms a vacuum, sucks water in from the middle water inlet 11, and uses centrifugal force to transport the water to the water outlet 12 for discharge. During the operation of the drive motor 3, the upper bearing seat 42, the lower bearing seat 41, the bearing assembly 43 and the axial displacement limiting member 413 provide axial support and rotational fixation for the rotating shaft 4, while restricting the axial movement stroke of the rotating shaft 4 to ensure the stable and efficient operation of the deep well pump.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the specific embodiments of the present invention. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. Deep well water pump, comprising 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 a drive motor (3), characterized in that, The driving motor (3) includes a housing (31) having a stator mounting space (313) and a rotor mounting space (314). The stator (32) of the driving motor (3) is fixed in the stator mounting space (313), and the rotor (33) of the driving 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), and 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 rotatably connected to a rotating shaft (4). A load-bearing assembly (43) is provided between the top of the lower bearing seat (41) and the lower end face of the rotor (33). At least a part of the load-bearing assembly (43) is circumferentially fixedly connected to the lower bearing seat (41), and the remaining part of the load-bearing assembly (43) is in movable contact with at least a part of the load-bearing assembly (43) and is fixed to the lower end face of the rotor (33). An axial displacement limiting member (413) is provided on the rotating shaft (4) between the upper bearing seat (42) and the upper end of the rotor (33).

2. The deep well water pump according to claim 1, characterized in that, The load-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 circular pattern are provided on the upper end face of the wear-resistant plate seat (431), and a graphite ring (433) in movable contact with the wear-resistant plates (432) is fixed to the lower end face of the rotor (33).

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). Embedding portions (4321) embedded in the embedding recesses (4311) are provided on the lower surface of the wear-resistant plates (432), and the embedding recesses (4311) and the embedding portions (4321) are fixedly connected.

4. The deep well water pump according to claim 2, characterized in that, 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). The arc convex surface (4101) and the arc concave surface (4312) are mutually matched.

5. The deep well 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 notch grooves (4102) paired with the lower convex portions (4313) one by one are provided on the outer edge of the arc convex surface (4101).

6. The deep well water pump according to claim 1, wherein The housing (31) includes an outer barrel body (311) and an inner barrel body (312) located inside the outer barrel body (311). A lower cover (44) is provided between the lower ends of the outer barrel body (311) and the inner barrel body (312). At least a part of the lower bearing seat (41) is fixed inside the lower cover (44). An upper cover (45) is provided between the upper ends of the outer barrel body (311) and the inner barrel body (312). At least a part of the upper bearing seat (42) is fixed inside the upper cover (45).

7. The deep well water pump according to claim 6, characterized in that, An axle seal member (46) sleeved on the rotating shaft (4) is fixed inside the upper bearing housing (42). A circular groove (461) is formed in the axle seal member (46) to divide the axle seal member (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). 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).

8. The deep well pump according to claim 7, characterized in that, An output shaft seat (47) sleeved on the rotating shaft (4) is fixed on the top of the upper bearing housing (42), and an output shaft protective sleeve (48) sleeved on the rotating shaft (4) is provided on the top of the output shaft seat (47). A sealed space is formed inside among the axle seal member (46), the upper bearing housing (42) and the output shaft seat (47).

9. The deep well water pump according to claim 8, wherein, A circular rubber ring (423) is provided on the top of the upper bearing housing (42), and a bearing housing cover (49) connected to the upper bearing housing (42) through a detachable structure. The circular rubber ring (423) is arranged between the bearing housing cover (49) and the top of the upper bearing housing (42). The bearing housing cover (49) is annular. The output shaft seat (47) penetrates through the bearing housing cover (49), and the output shaft seat (47) is hermetically connected to the inner wall of the circular rubber ring (423).

10. The deep well pump according to claim 9, characterized in that, An outwardly extending annular contact portion (471) is provided on the outer wall of the output shaft seat (47). The annular contact portion (471) is located below at least part of the lower end surface of the bearing housing cover (49). When the circular rubber ring (423) is locked and extruded in the thickness direction by the bearing housing cover (49), the inner diameter of the circular rubber ring (423) is reduced, so that the annular contact portion (471) and the circular rubber ring (423) are sealed and relatively fixed to each other.

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