Novel full tubular pump with shaft system free of sealing

Abstract

The utility model discloses a novel full tubular pump with a shaft system free of sealing, which relates to the technical field of full tubular pumps, cancels the traditional mechanical seal and rolling bearing, and adopts a bearing system which is symmetrically arranged and is self-lubricated by a conveying medium. Comprising a thrust disc fixedly installed on a motor shaft, first plane thrust bearings installed on the two sides of the thrust disc, a first bearing unit and a second bearing unit which are symmetrically arranged on the two sides of the thrust disc, each bearing unit comprises a shaft sleeve, a heavy load type water guide bearing, a bearing body and a second plane thrust bearing, and the two sides of a hub body are connected with the two bearing units respectively. The heavy load type water guide bearing is matched with the shaft sleeve to bear radial force, and the first plane thrust bearing and the second plane thrust bearing are matched to bear bidirectional axial force. The utility model solves the problem that the bearing is damaged due to the failure of the mechanical seal of the existing full tubular pump, and has the advantages of reliable structure, no maintenance and long service life.

Description

Technical Field

[0001] This utility model relates to the field of full-flow pump technology, and in particular to a novel full-flow pump that uses a self-lubricating bearing system for conveying the medium and does not require a mechanical seal. Background Technology

[0002] A full-flow pump is a type of pump in which the motor rotor and impeller are integrated and immersed in the medium. Currently, mainstream wet full-flow pumps typically employ a structure combining rolling bearings and mechanical seals. For example, the bearing structure for a submersible wet full-flow pump disclosed in publication number CN215170839U improves stress distribution by optimizing the arrangement of angular contact ball bearings, but still requires a mechanical seal to protect the bearing chamber. Another common structure, such as a novel full-flow pump described in publication number CN218266385U, uses different bearing and seal arrangements, but still relies on a mechanical seal assembly to isolate the bearing chamber and the oil chamber.

[0003] The aforementioned existing technologies share a common weakness: mechanical seals are vulnerable components, easily worn and failing in fluids containing impurities, particles, or under harsh conditions. Once the seal fails, the conveyed medium will enter the bearing cavity, causing the precision rolling bearings to corrode and be damaged rapidly, leading to unit failures, frequent downtime for maintenance, high maintenance costs, and reduced overall reliability. Utility Model Content

[0004] To address the problems existing in the prior art, this utility model provides a novel full-flow pump with a shaft seal-free design. It eliminates the traditional mechanical seal and rolling bearings, and uses a heavy-duty water-guided bearing and a planar thrust bearing that are self-lubricated by the conveying medium to bear the radial and axial forces respectively, thereby solving the technical problem of pump damage caused by mechanical seal failure.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a novel shaft-sealed full-flow pump, including an inlet bell pipe, a wet stator, a motor rotor, blades, a hub body, a guide vane body, and a motor shaft. The blades connect the motor rotor and the hub body to form a rotor body. The pump also includes a thrust disc, two first planar thrust bearings, a first bearing unit, and a second bearing unit.

[0006] The thrust disk is fixedly mounted on the motor shaft and located between the first bearing unit and the second bearing unit. The two first planar thrust bearings are respectively fixedly mounted on the two end faces of the thrust disk by fasteners.

[0007] The first bearing unit and the second bearing unit are symmetrically arranged on both sides of the thrust disk, each including a bushing, a heavy-duty water-guided bearing, a bearing body, and a second planar thrust bearing; the bushing is fixedly installed on the motor shaft by a key and cooperates with the heavy-duty water-guided bearing to withstand radial force; the heavy-duty water-guided bearing is fixedly installed in the bearing body; the second planar thrust bearing is fixedly installed on the end face of the bearing body facing the thrust disk and abuts against the corresponding first planar thrust bearing to withstand bidirectional axial thrust.

[0008] The two sides of the hub body are respectively fixedly connected to the bearing bodies of the first bearing unit and the second bearing unit;

[0009] The heavy-duty water-guided bearing, the first planar thrust bearing, and the second planar thrust bearing are all self-lubricated by the conveying medium transported by the pump, thus achieving mechanical seal-free operation of the shaft system.

[0010] Furthermore, the bushing is axially fixed by a first retaining ring to prevent it from moving relative to the motor shaft.

[0011] Furthermore, one side of the thrust disc is axially positioned by the shoulder of the motor shaft, and the other side is axially fixed by the second retaining ring.

[0012] Furthermore, the heavy-duty water-guided bearing is fixed to the bearing body with screws to prevent it from rotating circumferentially.

[0013] Furthermore, the bearing body is fixedly mounted to the end of the hub body by screws.

[0014] Furthermore, the two first planar thrust bearings are respectively fixed to the thrust plate by screws, and the second planar thrust bearing is fixed to the bearing body by screws.

[0015] The beneficial effects of this utility model are as follows: This utility model eliminates the vulnerable mechanical seal and water-sensitive rolling bearings, thus structurally eliminating pump failures caused by the failure of such components and greatly extending the service life; all bearings are self-lubricated by the conveying medium, eliminating the need for an additional lubrication system and reducing maintenance costs and complexity; heavy-duty water-guided bearings are used to bear radial forces, and symmetrically arranged planar thrust bearing groups bear bidirectional axial forces, resulting in high bearing capacity and stable operation of the bearing system; the structure is compact, and the shaft system components are highly modular, facilitating installation and debugging. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0018] In the diagram: 1. Inlet bell pipe; 2. Wet stator; 3. Motor rotor; 4. Blade; 5. Hub body; 6. Guide vane body; 7. Motor shaft; 8. Thrust disc; 9. First plane thrust bearing; 10. Second plane thrust bearing; 11. Bearing body; 12. Heavy-duty water guide bearing; 13. Bushing; 14. First retaining ring; 15. Second retaining ring. Detailed Implementation

[0019] To facilitate understanding of this utility model, it will be described more comprehensively and in detail below with reference to the accompanying drawings and preferred embodiments. However, the scope of protection of this utility model is not limited to the following specific embodiments.

[0020] like Figure 1 , Figure 2 As shown, this embodiment provides a novel full-flow pump with a shaft system that does not require sealing. The pump mainly includes an inlet bell pipe 1, a wet stator 2, a motor rotor 3, blades 4, a hub body 5, a guide vane body 6, a motor shaft 7, a thrust disc 8, a first planar thrust bearing 9, a second planar thrust bearing 10, a bearing body 11, a heavy-duty water guide bearing 12, a shaft sleeve 13, a first retaining ring 14, and a second retaining ring 15.

[0021] The outer side of the blade 4 is connected to the motor rotor 3, and the inner side is connected to the hub body 5, together forming a rotatable rotor body. The wet stator 2 is fixedly installed inside the pump casing, and the motor shaft 7 serves as the core drive shaft.

[0022] The thrust plate 8 is fixedly mounted on the motor shaft 7, specifically located between the first bearing unit and the second bearing unit described below. One side of the thrust plate 8 is axially positioned by a shoulder machined on the motor shaft 7, while the other side is axially fixed by a second retaining ring 15, thereby preventing axial movement between the thrust plate 8 and the motor shaft 7. Two first planar thrust bearings 9 are respectively fixedly mounted on the left and right end faces of the thrust plate 8 with screws.

[0023] The pump also includes a first bearing unit and a second bearing unit, which are structurally identical and symmetrically arranged on both sides of the thrust disk 8. Taking one side as an example: the bearing body 11 is fixedly mounted to the end of the hub body 5 with screws. The heavy-duty water-guided bearing 12 is fixedly mounted (e.g., press-fitted) inside the bearing body 11, and screws prevent the heavy-duty water-guided bearing 12 from rotating relative to the bearing body 11. The bushing 13 is fixedly mounted on the motor shaft 7 with a key to achieve circumferential transmission, and is axially fixed with a first retaining ring 14 to prevent it from moving relative to the motor shaft 7. The outer circular surface of the bushing 13 mates with the inner hole of the heavy-duty water-guided bearing 12 to withstand the radial force generated during pump operation. The second planar thrust bearing 10 is fixedly mounted on the end face of the bearing body 11 facing the thrust disk 8 with screws. After assembly, the friction surface of the second planar thrust bearing 10 on each side abuts against the friction surface of the first planar thrust bearing 9 on the corresponding side to withstand the bidirectional axial thrust generated during pump operation.

[0024] The heavy-duty water-guided bearing 12, the first planar thrust bearing 9, and the second planar thrust bearing 10 are all lubricated and cooled by the conveying medium transported by the pump, thereby achieving the entire shaft system without external grease lubrication and mechanical seals.

[0025] The working principle of this utility model is as follows: When the pump is running, the motor rotor 3 drives the rotor body composed of blades 4 and hub body 5 and the motor shaft 7 to rotate together. The generated radial force is transmitted to the heavy-duty water-guided bearing 12 through the bushing 13, and is finally borne by the bearing body 11. The generated axial force is transmitted to the first planar thrust bearing 9 through the thrust disc 8, and then acts on the second planar thrust bearing 10, and is also finally borne by the bearing body 11. The conveying medium flows into the friction pair gaps of each bearing, forming a lubricating film to ensure the long-term stable operation of the bearings.

[0026] With the aid of the teachings present in the foregoing description and related drawings, those skilled in the art will conceive of many modifications and other embodiments of the present invention. Therefore, it is to be understood that the present invention is not limited to the specific embodiments disclosed, and modifications and other embodiments are considered to be included within the scope of the appended claims. Although specific terms are used herein, they are used in a general and descriptive sense only and are not intended to be limiting.

Claims

1. A novel shaft-sealed full-flow pump, comprising an inlet bell pipe (1), a wet stator (2), a motor rotor (3), blades (4), a hub body (5), guide vanes (6), and a motor shaft (7), wherein the blades (4) connect the motor rotor (3) and the hub body (5) to form a rotor body, characterized in that: It also includes a thrust disk (8), two first planar thrust bearings (9), a first bearing unit and a second bearing unit; The thrust disk (8) is fixedly installed on the motor shaft (7) and located between the first bearing unit and the second bearing unit. The two first planar thrust bearings (9) are respectively fixedly installed on the two end faces of the thrust disk (8) by fasteners. The first bearing unit and the second bearing unit are symmetrically arranged on both sides of the thrust disk (8), each including a bushing (13), a heavy-duty water-guided bearing (12), a bearing body (11), and a second planar thrust bearing (10); the bushing (13) is fixedly installed on the motor shaft (7) by a key and cooperates with the heavy-duty water-guided bearing (12) to bear radial force; the heavy-duty water-guided bearing (12) is fixedly installed inside the bearing body (11); the second planar thrust bearing (10) is fixedly installed on the end face of the bearing body (11) facing the thrust disk (8) and abuts against the corresponding first planar thrust bearing (9) to bear bidirectional axial thrust; The two sides of the hub body (5) are fixedly connected to the bearing bodies (11) of the first bearing unit and the second bearing unit, respectively. The heavy-duty water-guided bearing (12), the first planar thrust bearing (9), and the second planar thrust bearing (10) are all self-lubricated by the conveying medium transported by the pump, thus achieving mechanical seal-free shaft system.

2. The novel shaft-seale-free full-flow pump according to claim 1, characterized in that, The bushing (13) is axially fixed by the first retaining ring (14) to prevent it from moving relative to the motor shaft (7).

3. A novel shaft-seale-free full-flow pump according to claim 1, characterized in that, The thrust plate (8) is axially positioned on one side by the shoulder of the motor shaft (7), and axially fixed on the other side by the second retaining ring (15).

4. A novel shaft-seale-free full-flow pump according to claim 1, characterized in that, The heavy-duty water-guided bearing (12) is fixed to the bearing body (11) by screws to prevent it from rotating circumferentially.

5. A novel shaft-seale-free full-flow pump according to claim 1, characterized in that, The bearing body (11) is fixedly installed at the end of the hub body (5) by screws.

6. A novel shaft-seale-free full-flow pump according to claim 1, characterized in that, The two first planar thrust bearings (9) are respectively fixed to the thrust plate (8) by screws, and the second planar thrust bearing (10) is fixed to the bearing body (11) by screws.

Images