Self-aligning shield pump
By adopting the spherical contact design between the thrust bearing and the sliding bearing in the shielding pump, the self-aligning ability is achieved, and the complex assembly and noise problems caused by the axial imbalance force of the shielding pump are solved, and the stability and life are improved.
Patent Information
- Application Number
- CN202422370839.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-26
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-26
AI Technical Summary
The existing shielding pumps require axial imbalance force to balance the thrust bearing, resulting in complex design of bearing system components and high manufacturing accuracy, which is prone to problems such as centering deviation, poor rotor rotation, high noise, and short life.
The thrust bearing and the sliding bearing are spherical contact, which has self-aligning ability, automatically adjusts the relative position of the shaft, adapts to the deflection and misalignment of the shaft, reduces assembly accuracy requirements, and reduces bias grinding and noise.
Improves the operating stability of the shielded pump, reduces noise, extends service life, and reduces production costs and power consumption losses.
Smart Images
Figure CN223152295U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of pumps, and particularly relates to a self-aligning canned motor pump. Background Technique
[0002] The canned motor pump has a wet rotor, and sliding bearings are adopted at both the front end and the rear end of the rotor. It has the advantages of small volume, light weight, high load-bearing capacity, self-lubrication, and simple assembly. However, due to the inherent axial unbalanced force during the operation of the canned motor pump, a thrust bearing must be provided to balance the axial force. The thrust bearing needs to bear the axial load generated to ensure the normal operation of the water pump. Therefore, the matching design between the bearing system components is crucial for the performance, service life, and noise of the canned motor pump.
[0003] To achieve the wet seal environment for the rotor operation, both the front bearing and the rear bearing need to be fixed and then encapsulated in the canned motor housing. As Figures 1-4 shown, the existing design method for installing the thrust bearing on the rotor shaft is as follows: the thrust disk in contact with the shaft adopts a spherical design, and the first spherical center SR1 is located on the shaft center line. Under the action of the axial force, the axial thrust surface is in close contact with the concave surface of the thrust disk of the thrust bearing. The thrust disk in contact with the end face of the sliding bearing of the above thrust bearing is a plane design, which is used to bear and balance the axial force.
[0004] For the canned motor pump, sliding bearings need to be used at both ends to bear the radial load of the rotor shaft of the water pump motor. The sliding bearing does not have the self-aligning ability. To ensure the centering requirements of the front bearing and the rear bearing, high requirements are put forward for the manufacturing accuracy and assembly process of related parts, such as the front bearing housing, the rear bearing housing, the machine base, and the canned motor housing. Otherwise, during assembly, it is very easy to occur problems such as poor rotor rotation or direct jamming caused by centering deviation, and during use, it is easy to occur eccentric wear, resulting in increased power consumption and noise, seriously affecting the service life of the pump. Content of the Utility Model
[0005] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a self-aligning canned motor pump. The thrust bearing and the sliding bearing in this canned motor pump are in spherical contact and have the self-aligning ability. It can automatically adjust the relative position with the shaft while bearing the axial load to adapt to the shaft deflection and misalignment, has a certain compensation ability, improves the operation stability of the canned motor pump, reduces noise, and prolongs the service life.
[0006] To achieve this purpose, the utility model adopts the following technical solutions:
[0007] A self-aligning canned motor pump, comprising:
[0008] The rotor shaft is sequentially provided with a thrust bearing and a sliding bearing at at least one of its front end and rear end, and the sliding bearing is arranged on one side close to the end of the rotor shaft.
[0009] For at least one set of the thrust bearings and the rotor shaft, they are connected by a first spherical surface, and between the thrust bearing and the sliding bearing is a second spherical surface connection. The first center of the first spherical surface and the second center of the second spherical surface are both located on the axis center line of the rotor shaft.
[0010] Preferably, the first spherical surface connection includes a concave first thrust surface formed on the thrust bearing, the first thrust surface is a spherical surface, and an outwardly convex spherical surface is formed on the rotor shaft to cooperate with the first thrust surface.
[0011] Preferably, the second spherical surface connection includes a convex second thrust surface formed on the thrust bearing, the second thrust surface is a spherical surface, and a concave spherical surface is formed on the sliding bearing to cooperate with the second thrust surface.
[0012] Preferably, a step is provided between the second thrust surface and the contact surface. The contact surface is parallel and directly opposite to the end face of the sliding bearing, and there is a preset axial distance between the contact surface and the end face.
[0013] Preferably, the range of the preset distance is 1 mm - 2 mm.
[0014] Preferably, an overflow groove is provided on the concave spherical surface of the sliding bearing.
[0015] Preferably, the overflow grooves are evenly distributed along the circumferential direction of the concave spherical surface.
[0016] Preferably, there are at least two sets of the overflow grooves.
[0017] Preferably, a bearing stopper is provided at one end of the thrust bearing away from the sliding bearing, and the rotor shaft passes through the bearing stopper.
[0018] Compared with the prior art, the utility model has the following beneficial effects: In the utility model, the thrust bearing and the rotor shaft are connected by a first spherical joint, and the thrust bearing and the sliding bearing 1 are connected by a second spherical joint. The center of the first spherical joint SR1 and the center of the second spherical joint SR are both located on the axis center line of the rotor shaft. Through the self-aligning ability of the first spherical joint and the second spherical joint, the displacement caused by the misalignment between the shaft and the front sliding bearing and the rear sliding bearing can be compensated, and the requirements for the related parts of the front sliding bearing and the rear sliding bearing are reduced. For example, the manufacturing precision and assembly process of the front bearing seat, the rear bearing seat, the machine base and the shielding sleeve are reduced, thereby reducing the production cost. At the same time, the problem of poor rotation or direct jamming of the rotor caused by misalignment deviation during the assembly process is also reduced, and the loss of power consumption caused by eccentric wear during the use of the pump is reduced. At the same time, due to the reduction of the eccentric wear problem, the working noise is also reduced, and the service life of the pump is improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 FIG. 6 is a schematic diagram of the first structure of a canned motor pump in the prior art;
[0020] Figure 2 is Figure 1 the enlarged view at I in FIG. 6;
[0021] Figure 3 FIG. 7 is a schematic diagram of the second structure of a canned motor pump in the prior art;
[0022] Figure 4 is Figure 3 the enlarged view at II in FIG. 7;
[0023] Figure 5 FIG. 8 is a schematic diagram of the structure of the self-aligning canned motor pump in the utility model;
[0024] Figure 6 is Figure 5 the enlarged view of the structure at III in FIG. 8;
[0025] Figure 7 FIG. 9 is a schematic diagram of the structure of the rotor shaft in the utility model;
[0026] Figure 8 FIG. 10 is a front view of the thrust bearing in the utility model;
[0027] Figure 9 FIG. 11 is Figure 8 the sectional view taken along the line A-A of FIG. 10;
[0028] Figure 10 FIG. 12 is a schematic diagram of the structure of the sliding bearing in the utility model;
[0029] Figure 11 FIG. 13 is Figure 10Cross-sectional view.
[0030] Wherein, 1 is a sliding bearing; 11 is a concave spherical surface; 12 is an overflow groove; 2 is a thrust bearing; 21 is a first thrust surface; 22 is a second thrust surface; 5 is a shielding sleeve; 6 is a rotor shaft; 61 is a convex spherical surface; 7 is a sliding bearing seat; 8 is a bearing stopper; SR1 is a first spherical center; SR2 is a second spherical center. Specific embodiments
[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings herein can be arranged and designed in various different configurations.
[0032] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts fall within the scope of protection of the present utility model.
[0033] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0034] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.
[0035] In the description of the present utility model, it should also be noted that, unless otherwise clearly specified and defined, the terms "arranged" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0036] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under", and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.
[0037] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.
[0038] As Figures 1-11 shown, in this embodiment, a self-aligning canned motor pump is provided, which relates to the technical field of centrifugal pumps. The self-aligning canned motor pump includes a rotor shaft 6. At least one of the front end and the rear end of the rotor shaft 6 is sequentially provided with a thrust bearing 2 and a sliding bearing 1, and the sliding bearing 1 is arranged on one side close to the end of the rotor shaft 6. The first spherical connection is between at least one group of thrust bearings 2 and the rotor shaft 6, and the second spherical connection is between the thrust bearing 2 and the sliding bearing 1. The first center of the sphere SR1 of the first spherical connection and the second center of the sphere SR2 of the second spherical connection are both located on the axis center line of the rotor shaft 6.
[0039] In this embodiment, a first spherical connection is provided between the thrust bearing 2 and the rotor shaft 6, and a second spherical connection is provided between the thrust bearing 2 and the sliding bearing 1. The first center of the sphere SR1 of the first spherical connection and the second center of the sphere SR2 of the second spherical connection are both located on the axis center line of the rotor shaft 6. Through the self-aligning ability of the first spherical connection and the second spherical connection, the displacement caused by the misalignment between the shaft and the front sliding bearing 1 and the rear sliding bearing 1 can be compensated, and the requirements for the related parts of the front sliding bearing 1 and the rear sliding bearing 1 during installation can be reduced. For example, the manufacturing precision and assembly process of the front bearing seat, the rear bearing seat, the machine base, and the shielding sleeve 5, thereby reducing the production cost. At the same time, it also reduces the occurrence of problems such as poor rotation or direct jamming of the rotor caused by misalignment deviation during the assembly process, and reduces the loss of power consumption caused by eccentric wear during the use of the pump. At the same time, due to the reduction of the eccentric wear problem, the working noise is also reduced, and the service life of the pump is improved.
[0040] Preferably, the first spherical connection includes a concave first thrust surface 21 provided on the thrust bearing 2. The first thrust surface 21 is a spherical surface, and an outer convex spherical surface 61 is provided on the rotor shaft 6 to cooperate with the first thrust surface 21.
[0041] The second spherical connection includes a convex second thrust surface 22 provided on the thrust bearing 2. The second thrust surface 22 is a spherical surface, and a concave spherical surface 11 is provided on the sliding bearing 1 to cooperate with the second thrust surface 22.
[0042] By providing the first thrust surface 21 on the thrust bearing 2, the displacement caused by the misalignment between the thrust bearing 2 and the rotor shaft 6 is compensated. This displacement also includes the radial displacement and circumferential displacement generated by the rotor bearing 6 during the working process. By providing the second thrust surface 22 on the thrust bearing 2, the displacement caused by the misalignment between the thrust bearing 2 and the sliding bearing 1 is compensated. Similarly, this displacement also includes the radial displacement and axial displacement generated by the rotor bearing 6 during the working process.
[0043] Preferably, a step is provided between the second thrust surface 22 and the contact surface. The contact surface is parallel and directly opposite to the end surface of the sliding bearing 1, and a preset distance is provided between the contact surface and the end surface.
[0044] When the thrust bearing 2 is working, in order to compensate for the displacement caused by the misalignment between the thrust bearing 2 and the rotor shaft 6, and between the rotor shaft 6 and the sliding bearing 1, the thrust bearing 2 will swing within a certain range. The preset distance between the contact surface and the end surface can prevent the contact surface of the thrust bearing 2 from contacting the end surface of the sliding bearing 1, resulting in interference or friction.
[0045] Preferably, an overflow groove 12 is provided on the concave spherical surface 11 of the sliding bearing 1. Through the overflow groove 12, a medium can be introduced to lubricate the second spherical connection formed by the sliding bearing 1 and the thrust bearing 2.
[0046] Preferably, the overflow grooves 12 are evenly distributed along the circumferential direction of the concave spherical surface 1.
[0047] Preferably, there are at least two groups of overflow grooves 12. More preferably, there are two groups, three groups and four groups of overflow grooves 12.
[0048] Preferably, a bearing stopper 8 is provided at one end of the thrust bearing 2 away from the sliding bearing 1, and the rotor shaft 6 passes through the bearing stopper 8 to fix the thrust bearing 2.
[0049] In this embodiment, the working environment of the rotor shaft 6 is in a wet environment, and grease lubrication is required for using rolling bearings. Therefore, rolling bearings cannot be used. In this embodiment, only the sliding bearing 1 can be used between the rotor shaft 6 and the shield sleeve 5.
[0050] In this embodiment, the planar contact friction pair between the thrust bearing 2 and the sliding bearing 1 is improved to a spherical contact pair, so that it has a certain self-aligning function. The design of this bearing enables it to automatically adjust the position of the rotor shaft 6 while bearing the axial load to adapt to the deflection and misalignment generated by the rotor shaft 6 during the working process, and has a certain compensation ability. After the improvement of the thrust bearing 2 with the above design, the alignment of the front sliding bearing, the rear sliding bearing and the rotor shaft 6 can be compensated, avoiding the problems of jamming and eccentric wear caused by the deflection and misalignment of the rotor shaft 6, thereby improving the operation stability of the canned motor pump, reducing the noise and prolonging the service life.
[0051] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.
Claims
1. A self-aligning canned motor pump, characterized in that, Comprising: A rotor shaft (6), at least one of the front end and the rear end of which is sequentially provided with a thrust bearing (2) and a sliding bearing (1), and the sliding bearing (1) is arranged on one side close to the end of the rotor shaft (6); There is a first spherical connection between at least one group of the thrust bearings (2) and the rotor shaft (6), and a second spherical connection between the thrust bearing (2) and the sliding bearing (1). The first center of the sphere (SR1) of the first spherical surface and the second center of the sphere (SR2) of the second spherical surface are both located on the axial center line of the rotor shaft (6).
2. The self-aligning canned motor pump according to claim 1, characterized in that, The first spherical connection includes a concave first thrust surface (21) formed on the thrust bearing (2), the first thrust surface (21) is a spherical surface, and a convex spherical surface (61) matching the first thrust surface (21) is formed on the rotor shaft (6).
3. The self-aligning canned motor pump according to claim 2, wherein The second spherical connection includes a convex second thrust surface (22) formed on the thrust bearing (2), the second thrust surface (22) is a spherical surface, and a concave spherical surface (11) matching the second thrust surface (22) is formed on the sliding bearing (1).
4. The self-aligning canned motor pump according to claim 3, characterized in that, A step is arranged between the second thrust surface (22) and the contact surface. The contact surface is parallel and directly opposite to the end face of the sliding bearing (1), and a preset distance is axially spaced between the contact surface and the end face.
5. The self-aligning canned motor pump according to claim 4, wherein, The range of the preset distance is 1 mm - 2 mm.
6. The self-aligning canned motor pump according to any one of claims 3-5, characterized in that, An overflow groove (12) is arranged on the concave spherical surface (11) of the sliding bearing (1).
7. The self-aligning canned motor pump according to claim 6, wherein The overflow grooves (12) are evenly distributed along the circumferential direction of the concave spherical surface (11).
8. The self-aligning canned motor pump according to claim 7, wherein, The overflow grooves (12) are at least two groups.
9. The self-aligning canned motor pump according to claim 8, wherein A bearing stop (8) is arranged at one end of the thrust bearing (2) away from the sliding bearing (1), and the rotor shaft (6) passes through the bearing stop (8).