Rotor structure and wet operation circulating pump with rotor structure

Abstract

The utility model relates to a rotor structure and a wet operation circulating pump with the rotor structure. The rotor structure comprises a front sliding bearing, a rear sliding bearing, a rotor rod and a permanent magnet, the rotor rod is provided with a front bearing accommodating space and a rear bearing accommodating space; the rotor rod fixes the front sliding bearing through the front bearing accommodating space, the rotor rod fixes the rear sliding bearing through the rear bearing accommodating space, and the permanent magnet is fixed on the outer surface of the rotor rod; the front sliding bearing and the rear sliding bearing are respectively nested on a central fixed shaft of the shielding tank assembly, and the rotor structure concentrically rotates around the central fixed shaft under the action of electromagnetic force of the stator assembly; the rotor structure at least further comprises a bearing sleeve arranged between the front sliding bearing and the front bearing containing space. Compared with the prior art, the wet operation circulating pump has the advantages that the performance of the wet operation circulating pump is improved, and the mechanical friction loss generated when the front sliding bearing and the rear sliding bearing rotate around the center shaft is greatly reduced.

Description

Technical Field

[0001] This utility model relates to a wet-running circulating pump, and more particularly to a rotor structure and a wet-running circulating pump having a rotor structure. Background Technology

[0002] As the core power unit of a liquid circulation system, the wet-running circulating pump's core function is to continuously drive fluid circulation through mechanical energy, achieving heat exchange, media transfer, or pressure maintenance. It is widely used in HVAC, industrial cooling, hot water supply, chemical processes, and automotive thermal management. A key characteristic of wet-running centrifugal pumps compared to dry-running centrifugal pumps is the presence of a shielded tank. This tank isolates the stator and rotor, limiting liquid flow into the stator and converting the dynamic seal of the dry-running centrifugal pump into a static seal. The rotor and shaft support system of the wet-running circulating pump are housed within the shielded tank. In this system, bearings can be mounted on the rotor or the shielded tank. These bearings are sliding bearings, and the shielded tank is directly connected to the liquid being pumped, ensuring continuous lubrication of the sliding bearings by the pumped medium, thus resulting in a longer bearing life. In existing wet-operation circulating pumps, sliding bearings are mostly made of inexpensive materials such as graphite or ceramics, which is economical. However, this ignores the fact that sliding bearings do not have self-aligning function compared to ball bearings. The mechanical losses of the circulating pump rotor and shaft support system using sliding bearings are relatively high, leading to an increase in electricity costs. To solve this problem, there is an urgent need to develop a rotor structure with self-aligning function, which can realize the self-aligning of sliding bearings. Utility Model Content

[0003] The purpose of this utility model is to overcome the defects of the prior art and provide a rotor structure and a wet-running circulating pump with a rotor structure.

[0004] The objective of this utility model can be achieved through the following technical solutions:

[0005] According to one aspect of the present invention, a rotor structure is provided, which is mounted on a wet-running circulating pump, the wet-running circulating pump including a shielding tank assembly and a stator assembly, and the rotor structure including a front sliding bearing, a rear sliding bearing, a rotor bar and a permanent magnet.

[0006] The rotor bar has a through hole structure, and a front bearing storage space is provided at the axial extension of its front end face and a rear bearing storage space is provided at the axial extension of its rear end face; the rotor bar fixes the front sliding bearing through the front bearing storage space, and the rotor bar fixes the rear sliding bearing through the rear bearing storage space; the permanent magnet is fixed on the outer surface of the rotor bar.

[0007] The front sliding bearing and the rear sliding bearing are respectively nested on the central fixed shaft of the shielding tank assembly. Under the electromagnetic force of the stator assembly, the rotor structure rotates concentrically around the central fixed shaft.

[0008] The rotor structure further includes at least: a bearing sleeve disposed between the front sliding bearing and the front bearing housing space, or a bearing sleeve disposed between the rear sliding bearing and the rear bearing housing space.

[0009] As a preferred technical solution, the elastic modulus of the bearing sleeve is smaller than that of the front sliding bearing, the rear sliding bearing, and the rotor bar.

[0010] As a preferred technical solution, the bearing sleeve is a bearing sleeve made of rubber.

[0011] As a preferred technical solution, the bearing sleeve is a cup-shaped cylinder.

[0012] As a preferred technical solution, the inner diameter of the bearing sleeve is in flat contact with the outer cylindrical surface of the front sliding bearing and is interference fit.

[0013] As a preferred technical solution, the outer diameter of the bearing sleeve is in flush contact with the base circle diameter of the front bearing storage space and is interference fit.

[0014] As a preferred technical solution, the bottom surface of the bearing sleeve contacts one end face of the front sliding bearing.

[0015] As a preferred technical solution, the front bearing housing space is cylindrical in shape, and the base circle is concentrically distributed with the outer diameter of the rotor bar.

[0016] As a preferred technical solution, the rear bearing housing space is cylindrical in shape, and the base circle is concentrically distributed with the outer diameter of the rotor bar.

[0017] According to another aspect of the present invention, a wet-running circulating pump with a rotor structure is provided, including a pump head, an impeller, a shielding tank assembly, and a stator assembly, wherein the wet-running circulating pump further includes the rotor structure described above.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1) The structure of this utility model can realize the floating self-alignment of the front sliding bearing e1 relative to the rear sliding bearing e2, which not only improves the performance of the wet operation circulating pump, but also greatly reduces the mechanical friction loss when the front and rear sliding bearings rotate around the central axis, thereby saving the power cost of the pump during operation.

[0020] 2) This utility model benefits from the fact that the elastic modulus of the bearing sleeve e3 is smaller than that of the front sliding bearing e1, the rear sliding bearing e2, and the rotor bar e4. Specifically, it is made of rubber. The front bearing storage space e8 of the front sliding bearing e1 and the rotor bar e4 compresses the bearing sleeve e3 together. The bearing sleeve yields to the compressive stress and forms elastic deformation, thereby realizing the floating self-alignment of the front sliding bearing e1 relative to the rear sliding bearing e2.

[0021] 3) In this utility model, the outer cylindrical surface e14 of the front sliding bearing e1 is in flat contact with the inner diameter e11 of the bearing sleeve and is interference fit, and the outer diameter e12 of the bearing sleeve is in flat contact with the base circle diameter e15 of the front bearing storage space e8 of the rotor bar e4 and is interference fit, which makes assembly simple and saves time and effort. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the wet-operation circulating pump structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the shielding tank assembly of this utility model;

[0024] Figure 3 This is a schematic diagram of the rotor structure of this utility model;

[0025] Figure 4 This is a schematic diagram of the bearing sleeve structure of this utility model;

[0026] Figure 5 This is a schematic diagram of the main structure of the rotor bar of this utility model;

[0027] Figure 6 This is a top view of the rotor bar structure of this utility model;

[0028] Figure 7 This is a schematic diagram of the structure of the front sliding bearing of this utility model.

[0029] Where a is the pump head, b is the pump head sealing ring, c is the impeller, d is the shielding tank assembly, e is the rotor structure, f is the stator assembly, and H is the bolt;

[0030] a1 is the inner sealing surface of the pump head, a2 is the flange end face of the pump head, a3 is the fastening through hole, b1 is the housing sealing ring, d1 is the central fixed shaft, d2 is the upper plane of the flange, d3 is the lower plane of the flange, d4 is the fastening through hole of the upper plane of the flange, f1 is the housing, f2 is the armature winding, f3 is the flange end face of the housing, and f4 is the threaded hole of the flange end face of the housing.

[0031] e1 is the front sliding bearing, e2 is the rear sliding bearing, e3 is the bearing sleeve, e4 is the rotor bar, e5 is the permanent magnet, e6 is the front end face, e7 is the rear end face, e8 is the front bearing storage space, e9 is the rear bearing storage space, e10 is the outer diameter of the rotor bar, e11 is the inner diameter of the bearing sleeve, e12 is the outer diameter of the bearing sleeve, e13 is the bottom surface of the bearing sleeve, e14 is the outer cylindrical surface of the front sliding bearing, and e15 is the base circle diameter of the front bearing storage space. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present utility model.

[0033] Example 1

[0034] like Figure 1 and Figure 3 As shown, this utility model has a self-aligning rotor structure. This rotor structure e is installed on a wet-running circulating pump, which includes a shielded tank assembly d and a stator assembly f. The rotor structure e includes a front sliding bearing e1, a rear sliding bearing e2, a bearing sleeve e3, a rotor bar e4, and a permanent magnet e5. The rotor bar e4 has a through-hole structure and has a front bearing housing space e8 and a rear bearing housing space e9 respectively opened at the axial extension of its front end face e6 and rear end face e7. Figure 5 As shown, the basic shape of the front bearing storage space e8 and the rear bearing storage space e9 of the rotor bar e4 is cylindrical, and the base circle is concentrically distributed with the outer diameter e10 of the rotor bar. The rotor bar e4 fixes the front sliding bearing e1 through the front bearing storage space e8 and the bearing sleeve e3, and fixes the rear sliding bearing e2 through the rear bearing storage space e9. The outer diameter e10 of the rotor bar is fixedly connected to the permanent magnet e5. That is, the rotor structure e is nested on the central fixed shaft d1 of the shielding tank assembly d through the front sliding bearing e1 and the rear sliding bearing e2. Under the electromagnetic force of the alternating magnetic field of the armature winding f2 of the stator assembly f, the rotor structure e can rotate concentrically around the central fixed shaft d1.

[0035] The rotor structure e has a bearing sleeve e3 mounted between the front sliding bearing e1 and the front bearing housing space e8 of the rotor bar e4. The elastic modulus of the bearing sleeve e3 is smaller than that of the front sliding bearing e1, the rear sliding bearing e2, and the rotor bar e4. Specifically, it is made of rubber. Figure 4As shown, the bearing sleeve e3 is specifically shaped like a cup-shaped cylinder, including the inner diameter e11, the outer diameter e12, and the bottom surface e13. The sliding bearing is specifically shaped like a hollow cylinder, as shown below. Figure 7 As shown, the outer cylindrical surface e14 of the front sliding bearing e1 is in flat contact with the inner diameter e11 of the bearing sleeve and is interference-fitted; the outer diameter e12 of the bearing sleeve is in flat contact with the base circle diameter e15 of the front bearing housing space e8 of the rotor bar e4 and is interference-fitted. Figure 6 As shown, the bearing sleeve e3 benefits from the fact that its elastic modulus is smaller than that of the front sliding bearing e1, the rear sliding bearing e2, and the rotor bar e4. Specifically, it is made of rubber. The front bearing housing space e8 of the front sliding bearing e1 and the rotor bar e4 compresses the bearing sleeve e3 together. The bearing sleeve e3 yields to the compressive stress and forms elastic deformation, thereby realizing the floating alignment of the front sliding bearing e1 relative to the rear sliding bearing e2. Specifically, the alignment action is that the rotor structure e is nested on the central fixed shaft d1 of the shielding tank assembly d through the front sliding bearing e1 and the rear sliding bearing e2. When the front sliding bearing e1 and the rear sliding bearing e2 are not concentric, the central fixed shaft d1 forms an interference dimension with the front sliding bearing e1 and the rear sliding bearing e2. This interference dimension will form an interference stress acting on the bearing sleeve e3. The bearing sleeve e3 is compressed and deformed under the interference stress, forming a clearance space. When the bearing sleeve e3 has a clearance space, the alignment action of the front sliding bearing e1 and the rear sliding bearing e2 is completed.

[0036] The above automatic self-aligning process not only improves the performance of the wet-running circulating pump, but also greatly reduces the mechanical friction loss when the front and rear sliding bearings rotate around the central axis, thereby saving the power cost of the pump during operation.

[0037] Example 2

[0038] like Figure 1 and Figure 2As shown, the present invention has a circulating pump with a rotor structure according to Embodiment 1. The circulating pump includes a pump head a, a pump head sealing ring b, a housing sealing ring b1, an impeller c, a shielding tank assembly d, a rotor structure e, and a stator assembly f. The shielding tank assembly has a central fixed shaft d1. The shielding tank assembly d internally isolates the liquid inside the pump head a from contact with the stator assembly f. The stator assembly f includes a housing f1 and an armature winding f2. The housing f1, in conjunction with the housing sealing ring b1, externally isolates the liquid from contact with the armature winding f2. The shielded tank assembly d has an upper flanged surface d2 and a lower flanged surface d3. A housing flange end face f3 is fitted with a housing sealing ring b1. The housing flange end face f3 is flush-connected to the lower flanged surface d3 of the shielded tank assembly d via the compressor housing sealing ring b1. A pump head sealing ring b is fitted to the upper flanged surface d2 of the shielded tank assembly d. The upper flanged surface d2 of the shielded tank assembly d is flush-connected to the inner cavity sealing surface a1 of the pump head a via the compressor housing sealing ring b. A bolt H passes through the fastening through hole a3 on the flange end face a2 of the pump head a. The bolt H passes through the fastening through hole d4 on the upper surface d2 of the flange of the shield tank assembly d and is fastened to the threaded hole f4 on the end face f3 of the housing flange. It also compresses the axial height of the pump head sealing ring b and the housing sealing ring b1, thereby achieving the sealing of the water entering the inner cavity of the pump head a and the stator assembly f. This ensures that the rotor structure e and the central fixed shaft d1 inside the shield tank assembly d are always wetted by the pumped medium. The central fixed shaft d1 inside the shield tank assembly d is fixed to the shield tank assembly d by insert injection molding, and the fixed position is radially centered.

[0039] Example 3

[0040] This utility model has a rotor structure with self-aligning function. The position of the bearing sleeve in Embodiment 1 has been changed. The bearing sleeve e3 is placed between the rear sliding bearing e2 and the rear bearing storage space e9. The rest is the same as in Embodiment 1.

[0041] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A rotor structure (e) mounted on a wet-running circulating pump, the wet-running circulating pump including a shield tank assembly (d) and a stator assembly (f), the rotor structure (e) including a front sliding bearing (e1), a rear sliding bearing (e2), a rotor bar (e4) and a permanent magnet (e5); The rotor bar (e4) has a through-hole structure, and a front bearing housing space (e8) is provided at the axial extension of its front end face (e6) and a rear bearing housing space (e9) is provided at the axial extension of its rear end face (e7). The rotor bar (e4) fixes the front sliding bearing (e1) through the front bearing housing space (e8), and fixes the rear sliding bearing (e2) through the rear bearing housing space (e9). The permanent magnet (e5) is fixed on the outer surface of the rotor bar (e4). The front sliding bearing (e1) and the rear sliding bearing (e2) are respectively nested on the central fixed shaft (d1) of the shielding tank assembly (d). Under the electromagnetic force of the stator assembly (f), the rotor structure (e) rotates concentrically around the central fixed shaft (d1). characterized in that The rotor structure (e) further includes at least: a bearing sleeve (e3) disposed between the front sliding bearing (e1) and the front bearing housing space (e8), or a bearing sleeve (e3) disposed between the rear sliding bearing (e2) and the rear bearing housing space (e9).

2. A rotor structure according to claim 1, wherein The elastic modulus of the bearing sleeve (e3) is smaller than that of the front sliding bearing (e1), the rear sliding bearing (e2), and the rotor bar (e4).

3. A rotor structure according to claim 2, wherein The bearing sleeve (e3) is made of rubber.

4. The rotor structure of claim 1, wherein The bearing sleeve (e3) is a cup-shaped cylinder.

5. The rotor structure of claim 1 wherein, The inner diameter (e11) of the bearing sleeve is in flat contact with the outer cylindrical surface (e14) of the front sliding bearing (e1) and is interference fit.

6. The rotor structure according to claim 1, characterized in that, The outer diameter (e12) of the bearing sleeve is in flush contact with the base circle diameter (e15) of the front bearing housing space (e8) and is interference fit.

7. The rotor structure of claim 1 wherein, The bottom surface (e13) of the bearing sleeve is in contact with one end face of the front sliding bearing (e1).

8. The rotor structure of claim 1, wherein The front bearing housing space (e8) is cylindrical in shape, and its base circle is concentrically distributed with the outer diameter (e10) of the rotor bar.

9. The rotor structure of claim 1 wherein, The rear bearing housing space (e9) is cylindrical in shape, and its base circle is concentrically distributed with the outer diameter (e10) of the rotor bar.

10. A wet-running circulation pump having a rotor construction comprising a pump head (a), an impeller (c), a canned tank assembly (d), a stator assembly (f), characterized in that, The wet-running circulating pump also includes the rotor structure (e) described in any one of claims 1-9.

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