Wet rotor pump
Through the integrated molded shield shell and combined matching connection technology, the problems of difficult assembly and complex process of wet rotor pumps are solved, and the assembly of welding-free and bearing frames is achieved, and assembly efficiency and reliability are improved.
Patent Information
- Application Number
- CN202420886018.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-26
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-04-26
AI Technical Summary
During the assembly process, existing wet rotor pumps are difficult to assemble due to unreliable welding and complex assembly steps, and require additional bearing frame connections, which increases process complexity.
The integrated shielding shell is adopted to directly embed the front bearing, and the rotor assembly and shielding shell are connected through interference fit and concave-convex fit, eliminating the steps of welding and assembling the bearing frame.
The assembly process of the wet rotor pump is simplified, avoids unreliable and complex processes of welding, and improves the reliability and efficiency of assembly.
Smart Images
Figure CN222315442U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of pumps, and in particular relates to a wet rotor pump. Background Art
[0002] In existing wet rotor pumps, the shielding shell usually includes a front end portion, a rotor cavity portion, and a rear end portion which are arranged in sections from front to back, and needs to be fixed by welding during the assembly process. Since the shielding shell of some wet rotor pumps has pressure-bearing and sealing requirements, the shielding shell has high welding standards, which is prone to problems such as loose welding and welding leakage, making the assembly of wet rotor pumps more difficult; and the front bearing of some wet rotors needs to be connected to the shielding shell through a bearing frame, resulting in more installation steps for the wet rotor and complicated assembly process. Utility Model Content
[0003] The utility model provides a wet rotor pump, which directly embeds a front bearing into an integrally formed shielding shell, thereby eliminating the steps of welding and assembling a bearing frame, thereby improving the problem of difficult assembly and complicated assembly process of the wet rotor pump.
[0004] An embodiment of the utility model provides a wet rotor pump, comprising an integrally formed shielding shell, a rotor assembly disposed in the shielding shell, and a bearing assembly connecting the rotor assembly and the shielding shell;
[0005] The interior of the shielding shell is hollow and an opening is formed on its front end surface, a flange plate is formed on the outside of the opening at the front end of the shielding shell, a rotor cavity is formed on the inner side of the middle part of the shielding shell, and the rear end of the shielding shell shrinks inwardly;
[0006] The rotor assembly comprises a rotating shaft and a rotor core, the front end of the rotating shaft extends out of the opening of the shielding shell, and the rotor core is accommodated in the rotor cavity;
[0007] The bearing assembly includes a front bearing and a rear bearing rotatably mounted on the rotating shaft, the outer peripheral wall of the front bearing is connected to the front end of the shielding shell by an interference fit, and the outer peripheral wall of the rear bearing is connected to the rear end of the shielding shell by a concave-convex fit or an interference fit.
[0008] In some embodiments, the front bearing is provided with a first flow hole extending through its front and rear end surfaces, the rear bearing is provided with a second flow hole extending through its front and rear end surfaces, and the rotating shaft is provided with a third flow hole extending through its front and rear end surfaces.
[0009] In some embodiments, a portion of the rotating shaft extending out of the opening of the shielding shell is provided with a fourth flow hole along its radial direction, and the fourth flow hole is connected to the third flow hole.
[0010] In some embodiments, a space is left between the rear end surface of the rotating shaft and the rear end surface of the shielding shell.
[0011] In some embodiments, the wet rotor pump also includes a first filter arranged corresponding to the first flow hole and a second filter arranged corresponding to the third flow hole, and the second filter is arranged near the middle or rear end of the third flow hole, so that the fourth flow hole is located in front of the second filter.
[0012] In some embodiments, the first flow hole is in the shape of a through hole that passes through the front bearing, and the second flow hole is in the shape of a through hole that passes through the rear bearing.
[0013] In some embodiments, the first filter is embedded in the first flow hole, and the second filter is embedded in the third flow hole.
[0014] In some embodiments, an axial thrust sliding bearing is further provided between the front bearing and the rotor core. The axial thrust sliding bearing is sleeved on the rotating shaft, and the front end surface of the axial thrust sliding bearing abuts against the rear end surface of the front bearing.
[0015] In some embodiments, the front bearing and the rear bearing are both sleeve-shaped, and the front bearing and the rear bearing are made of graphite or ceramic.
[0016] In some embodiments, the shaft is made of stainless steel or ceramic.
[0017] The wet rotor pump of the utility model has a front bearing fixedly connected to the front end of the shielding shell by an interference fit, and a rear bearing of the bearing assembly is connected to the rear end of the shielding shell by an interference fit or a concave-convex fit. The bearing assembly cooperates with the one-piece shielding shell, so that there is no need for welding during the entire assembly process of the wet rotor pump, and the step of assembling the bearing frame is omitted, which effectively improves the problem of the wet rotor pump having a difficult assembly and a complicated assembly process. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 Schematic diagram of the structure of the wet rotor pump of this embodiment.
[0019] In the figure, the shielding shell 10; the flange plate 11; the rotating shaft 20; the third flow hole 21; the fourth flow hole 22; the rotor core 30; the front bearing 40; the first flow hole 41; the rear bearing 50; the second flow hole 51; the first filter 60; the second filter 61; the axial thrust sliding bearing 70; the impeller 80; and the elastic buffer pad 90. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0021] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention.
[0022] The structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.
[0023] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "axial" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.
[0024] like Figure 1 As shown, this embodiment provides a wet rotor pump, including an integrally formed shielding shell 10, a rotor assembly arranged in the shielding shell 10, and a bearing assembly connecting the rotor assembly and the shielding shell 10. The rotor assembly includes a rotating shaft 20 and a rotor core 30 fixedly arranged on the rotating shaft 20. The bearing assembly includes a front bearing 40 and a rear bearing 50 rotatably sleeved on the rotating shaft 20, the front bearing 40 is located in front of the rotor core 30, and the rear bearing 50 is located behind the rotor core 30. The rotating shaft 20 is rotatably inserted into the front bearing 40 and the rear bearing 50, the front bearing 40 and the rear bearing 50 are fixed to the shielding shell 10, and the rotating shaft 20 and the rotor core 30 can rotate relative to the front bearing 40, the rear bearing 50 and the shielding shell 10.
[0025] The shielding shell 10 of this embodiment is hollow inside, with an opening formed at the front end surface of the shielding shell 10 and a sealed end surface of the shielding shell 10. A flange plate 11 is formed at the front end of the shielding shell 10 outside the opening, and the flange plate 11 is used to cooperate with the pump cover to form a pump chamber, and an impeller 80 is arranged in the pump chamber to promote liquid flow.
[0026] The inner side of the front end of the shielding shell 10 is used to connect to the front bearing 40; the inner side of the middle part of the shielding shell 10 forms a rotor cavity, which is used to accommodate the rotor core 30; the rear end of the shielding shell 10 shrinks inward, and the inner side of the rear end is used to connect to the rear bearing 50; the front end of the rotating shaft 20 extends out of the opening of the shielding shell 10 to connect to the impeller 80.
[0027] Specifically, the inner circumferential wall of the front bearing 40 is in clearance fit with the rotating shaft 20, and the outer circumferential wall of the front bearing 40 is fixedly connected to the inner circumferential wall of the front end of the shielding shell 10. The inner circumferential wall of the rear bearing 50 is in clearance fit with the rotating shaft 20, and the outer circumferential wall of the rear bearing 50 is fixedly connected to the inner circumferential wall of the front end of the shielding shell 10. In this embodiment, the rear end of the shielding shell 10 is in a closed shape, so that the inner diameter of the rear end of the shielding shell 10 is smaller than the inner diameter of the front end, and then the outer diameter of the rear bearing 50 is smaller than the outer diameter of the front bearing 40, so that the rear bearing 50 can easily pass through the inner side of the front end of the shielding shell 10, which not only saves the material of the rear bearing 50 and facilitates the installation of the rear bearing 50, but also facilitates the distinction and installation of the front bearing 40 and the rear bearing 50.
[0028] The shielding shell 10 of this embodiment is preferably first formed into a blank through a stretching process, and the blank is stamped and stretched in one piece, so that the dimensions of the inner sides of the front end, middle part and rear end of the shielding shell 10 meet the assembly requirements. The outer side of the middle part of the shielding shell 10 can be machined to a uniform thickness of the wall thickness of the rotor cavity according to the electrical clearance requirements between the rotor core 30 and the stator, so as to ensure that there is the same electrical clearance between the rotor core 30 inside the rotor cavity and the stator outside the rotor cavity. Compared with the segmented traditional shielding shell 10, the one-piece shielding shell 10 of this embodiment omits the step of welding during the assembly process, thereby avoiding the problems of unreliable welding and welding leakage, and thus reducing the difficulty of assembly.
[0029] The front bearing 40 of this embodiment is preferably fixedly connected to the front end of the shielding shell 10 by interference fit, and the rear bearing 50 is preferably fixedly connected to the rear end of the shielding shell 10 by concave-convex fit or interference fit. Since the conventional wet rotor pump usually needs to be provided with a bearing bracket to connect the front bearing 40 and the front end of the shielding shell 10, in the wet rotor pump of this embodiment, the front bearing 40 of the bearing assembly is fixedly connected to the front end of the shielding shell 10 by interference fit, and the rear bearing 50 of the bearing assembly is connected to the rear end of the shielding shell 10 by interference fit or concave-convex fit. The bearing assembly is combined with the integrally formed shielding shell 10 so that welding is not required during the entire assembly process of the wet rotor pump, and the step of assembling the bearing bracket is omitted, which effectively improves the problem of the difficulty of assembling the wet rotor pump and the complicated assembly process.
[0030] It should be noted that the concave-convex matching method specifically refers to a mutually matching convex and concave structure formed between the rear bearing 50 and the shielding shell 10 , and the convex and concave structure can limit the rear bearing 50 to remain relatively still relative to the shielding shell 10 .
[0031] The front bearing 40 of this embodiment is provided with a first flow hole 41 penetrating the front and rear end surfaces thereof, the rear bearing 50 is provided with a second flow hole 51 penetrating the front and rear end surfaces thereof, and the rotating shaft 20 is provided with a third flow hole 21 penetrating the front and rear end surfaces thereof. A certain space is left between the rear end surface of the rotating shaft 20 and the rear end surface of the shielding shell 10 of this embodiment, so that the medium in the shielding shell 10 can enter the third filter hole 21 from the rear end surface of the rotating shaft 20. In the wet rotor pump of this embodiment, the liquid in the pump cavity can first enter the interior of the rotor cavity through the first flow hole 41 on the front bearing 40, then flow to the interior of the rear end of the shielding shell 10 through the second flow hole 51 on the rear bearing 50, and finally flow back to the pump cavity through the third flow hole 21 on the rotating shaft 20, so that the wet rotor pump can use the transported medium to cool the rotating shaft 20, the front bearing 40, the rotor core 30 and the rear bearing 50, which helps to improve the heat dissipation effect of the wet rotor pump.
[0032] In this embodiment, the portion of the rotating shaft 20 extending out of the opening of the shielding shell 10 is also provided with a fourth flow hole 22, and the fourth flow hole 22 is connected to the third flow hole 21 along the radial direction of the rotating shaft 20. The medium in the pump chamber can enter the third flow hole 21 from the fourth flow hole 22, and then flow back to the pump chamber from the front end of the third flow hole 21, which can relieve the back pressure and guide the liquid circulation in the shielding shell 10. It should be noted that some embodiments can only open the third flow hole 21 on the rotating shaft 20 according to needs.
[0033] In this embodiment, the first flow hole 41 on the front bearing 40 is preferably provided on the end face of the front bearing 40, and is in the form of a through hole penetrating the front bearing 40. The second flow hole 51 on the rear bearing 50 is preferably provided on the end face of the rear bearing 50, and is in the form of a through hole penetrating the rear bearing 50, which is convenient for processing. The first flow hole 41 of some embodiments may also include a groove-shaped portion provided on the outer peripheral wall of the front bearing 40 and a portion of the shielding shell 10 corresponding to the groove-shaped portion; the second flow hole 51 of some embodiments may also include a groove-shaped portion provided on the outer peripheral wall of the rear bearing 50 and a portion of the shielding shell 10 corresponding to the groove-shaped portion.
[0034] Since the first flow hole 41 and the third flow hole 21 can directly connect to the pump chamber, when the medium in the pump chamber contains more impurities, the impurities can easily cause internal wear or blockage of the wet rotor pump. For this reason, the first filter 60 corresponding to the first flow hole 41 and the second filter 61 corresponding to the third flow hole 21 are provided in this embodiment, and the second filter 61 is provided near the middle or rear end of the third flow hole 21, so that the fourth flow hole 22 is located in front of the second filter 61. The filter can filter impurities in the medium to avoid the situation where the interior of the wet rotor pump is blocked or damaged by impurities. It should be noted that the first filter 60 and the second filter 61 can be filter nets, or other conventional filtering devices can be selected according to needs.
[0035] The first filter 60 of this embodiment is preferably embedded in the first flow hole 41, and the second filter 61 is embedded in the third flow hole 21, which is convenient for installation. In some embodiments, the filters can be set at the ends of the corresponding flow holes according to needs. For example, the first filter 60 can be fixed on the front and rear end surfaces of the front bearing 40, and the second filter 61 can be fixed on the rear end surface of the rotating shaft 20.
[0036] Conventional wet rotor pumps usually have a cover plate at the opening of the shielding shell 10, which is sleeved on the rotating shaft 20 and connected to the rotating shaft 20 through a floating ring, which can be used to filter impurities. The wet rotor pump of this embodiment directly corresponds to the first flow hole 41 to set the first filter 60 to replace the floating ring in the conventional wet rotor pump, so the wet rotor pump of this embodiment can omit the cover plate and the floating ring, and has a simple structure.
[0037] This embodiment also includes an elastic buffer pad 90 disposed between the rear end face of the rotating shaft 20 and the rear end face of the shielding shell 10. The elastic buffer pad 90 can absorb the impact force generated by the axial movement of the rotating shaft 20, prevent the rotating shaft 20 from directly colliding with the rear end face of the shielding shell 10, and extend the service life. The elastic buffer pad 90 has a hollow structure to prevent it from blocking the third flow hole 21 and affecting the medium circulation in the shielding shell 10.
[0038] In this embodiment, an axial thrust sliding bearing 70 is further provided between the front bearing 40 and the rotor core 30. The axial thrust sliding bearing 70 is sleeved on the rotating shaft 20, and the front end surface of the axial thrust sliding bearing 70 abuts against the rear end surface of the front bearing 40. The axial thrust sliding bearing 70 is used to maintain the distance between the front bearing 40 and the rotor core 30. It should be noted that since the axial thrust sliding bearing 70 is a prior art, its specific structure is not described in detail in this embodiment.
[0039] It should be noted that in the field of wet rotor pumps, the front bearing 40 and the rear bearing 50 are both sleeve-shaped. The front bearing 40 and the rear bearing 50 of this embodiment can be made of graphite or ceramic material according to requirements, and the rotating shaft 20 can be made of stainless steel or ceramic material according to requirements.
[0040] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0041] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. A wet rotor pump, characterized in that: It comprises an integrally formed shielding shell (10), a rotor assembly arranged in the shielding shell (10), and a bearing assembly connecting the rotor assembly and the shielding shell (10); The interior of the shielding shell (10) is hollow and its front end surface forms an opening, the front end portion of the shielding shell (10) forms a flange plate (11) outside the opening, the inner side of the middle portion of the shielding shell (10) forms a rotor cavity, and the rear end portion of the shielding shell (10) shrinks inwardly; The rotor assembly comprises a rotating shaft (20) and a rotor core (30), the front end of the rotating shaft (20) protrudes from the opening of the shielding shell (10), and the rotor core (30) is accommodated in the rotor cavity; The bearing assembly comprises a front bearing (40) and a rear bearing (50) rotatably sleeved on the rotating shaft (20); the outer peripheral wall of the front bearing (40) is connected to the front end of the shielding shell (10) by means of an interference fit, and the outer peripheral wall of the rear bearing (50) is connected to the rear end of the shielding shell (10) by means of a concave-convex fit or an interference fit.
2. The wet rotor pump according to claim 1, characterized in that: The front bearing (40) is provided with a first flow hole (41) penetrating the front and rear end surfaces thereof, the rear bearing (50) is provided with a second flow hole (51) penetrating the front and rear end surfaces thereof, and the rotating shaft (20) is provided with a third flow hole (21) penetrating the front and rear end surfaces thereof.
3. The wet rotor pump according to claim 2, characterized in that: The portion of the rotating shaft (20) extending out of the opening of the shielding shell (10) is provided with a fourth flow hole (22) along its radial direction, and the fourth flow hole (22) is connected to the third flow hole (21).
4. The wet rotor pump according to claim 2, characterized in that: A space is left between the rear end surface of the rotating shaft (20) and the rear end surface of the shielding shell (10).
5. The wet rotor pump according to claim 3, characterized in that: It also includes a first filter (60) arranged corresponding to the first flow hole (41) and a second filter (61) arranged corresponding to the third flow hole (21), wherein the second filter (61) is arranged close to the middle or rear end of the third flow hole (21), so that the fourth flow hole (22) is located in front of the second filter (61).
6. The wet rotor pump according to claim 4, characterized in that: The first flow hole (41) is in the shape of a through hole that penetrates the front bearing (40), and the second flow hole (51) is in the shape of a through hole that penetrates the rear bearing (50).
7. The wet rotor pump according to claim 5, characterized in that: The first filter (60) is embedded in the first flow hole (41), and the second filter (61) is embedded in the third flow hole (21).
8. The wet rotor pump according to claim 1, characterized in that: An axial thrust sliding bearing (70) is also provided between the front bearing (40) and the rotor core (30). The axial thrust sliding bearing (70) is sleeved on the rotating shaft (20), and the front end surface of the axial thrust sliding bearing (70) abuts against the rear end surface of the front bearing (40).
9. The wet rotor pump according to claim 1, characterized in that: The front bearing (40) and the rear bearing (50) are both sleeve-shaped, and the front bearing (40) and the rear bearing (50) are made of graphite or ceramics.
10. The wet rotor pump according to claim 1, characterized in that: The rotating shaft (20) is made of stainless steel or ceramic.