Bearing fixing structure

Abstract

The present invention relates to a bearing fixing structure installed in a wet-running pump unit. The wet-running pump unit includes a shielded sealing tank and a front bearing. The bearing fixing structure includes a front bearing support, which includes an outer diameter positioning surface and an inner diameter positioning surface. The outer diameter positioning surface and the inner diameter positioning surface are connected to form a single unit via an inner and outer diameter connecting portion. The outer diameter positioning surface and the inner diameter positioning surface share a central axis. The outer diameter positioning surface is concentrically aligned with the first inner diameter of the shielded sealing tank, and the inner diameter positioning surface is aligned with the front bearing. Compared with the prior art, the present invention has the advantages of not only improving overall assembly accuracy but also reducing the difficulty of part processing.

Description

Technical Field

[0001] The invention relates to a bearing fixing structure, in particular to a bearing fixing structure for a wet-running pump unit. Background Art

[0002] A wet-running pump unit consists of a pump head and a motor. The motor is connected to the pump head via a stator housing. The wet-running pump unit's design isolates the moving and stator components, a process known as magnetic transmission. This eliminates the dynamic seals of dry-running units and fundamentally eliminates water leakage. In existing wet-running pump units, the rotor assembly is positioned and supported by a rotating shaft and bearings. The bearings are positioned and supported by connectors between the rotor assembly and the shielded seal tank. The front and rear support bearings of the rotor assembly are installed in the shielded seal tank via connectors. The use of at least two connectors makes it extremely difficult to ensure the coaxiality of the front and rear rotor support bearings. Eliminating the connectors and directly press-fitting the ceramic bearings into the shielded seal tank poses a challenge to the machining accuracy of the shielded seal tank. Increased interference fit can cause the ceramic bearings to fracture. Ensuring the concentricity of the front and rear bearings and their secure retention in the shielded seal tank are key technologies for wet-running pump units.

[0003] A search of Chinese Patent Publication No. CN104040182A discloses a disc-shaped metal bearing seat, where the centering surface of the bearing seat abuts against the corresponding contact surface of the pump housing, centered between the bearing seat and the sealing can relative to the pump housing. However, this existing patent only discloses a structure where the centering surface of the bearing seat abuts against the pit housing and is centered, and does not address the issue of centering the bearing seat and the sealing can, that is, the concentricity of the two bearings. Summary of the Invention

[0004] The purpose of the present invention is to provide a bearing fixing structure in order to overcome the defects of the above-mentioned prior art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] According to one aspect of the present invention, a bearing fixing structure is provided, which is installed in a wet-running pump unit, wherein the wet-running pump unit includes a shielding sealing tank and a front bearing, and the bearing fixing structure includes a front bearing support, which includes an outer diameter locating surface and an inner diameter locating surface, and the outer diameter locating surface and the inner diameter locating surface are connected into a whole through an inner and outer diameter connecting portion, and the outer diameter locating surface and the inner diameter locating surface share a central axis, and the outer diameter locating surface is concentrically matched with the first inner diameter of the shielding sealing tank, and the inner diameter locating surface is matched with the front bearing.

[0007] As a preferred technical solution, the inner diameter positioning surface is interference fit with the front bearing and is radially concentrically arranged; the inner and outer diameter connecting portion is provided with an escape space for absorbing deformation of the inner diameter positioning surface.

[0008] As a preferred technical solution, the outer diameter positioning surface extends along the axial direction to form an axial positioning surface, and the axial positioning surface cooperates with the first folded edge of the shielding sealing can;

[0009] The axial positioning surface provides accurate axial positioning and support for the front bearing through the shielding sealing can.

[0010] As a preferred technical solution, the outer peripheral edge of the axial positioning surface has a set number of notches.

[0011] As a preferred technical solution, the inner and outer diameter connecting portion, the outer diameter positioning surface, the inner diameter positioning surface, the notch and the axial positioning surface are integral components obtained by extending the same material.

[0012] As a preferred technical solution, the inner diameter positioning surface is designed as a coaxiality reference for the outer diameter positioning surface and a perpendicularity reference for the axial positioning surface.

[0013] As a preferred technical solution, the outer diameter positioning surface and the inner diameter positioning surface are provided with an avoidance space in the diameter direction.

[0014] As a preferred technical solution, the outer diameter positioning surface and the inner diameter positioning surface are spaced apart in the diameter direction.

[0015] As a preferred technical solution, the notch is a notch used to facilitate the circulation of liquid, and the notch includes but is not limited to a circular shape.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1) The present invention not only improves the overall assembly accuracy, but also reduces the difficulty of parts processing;

[0018] 2) The assembly difficulty of the present invention is reduced;

[0019] 3) An interference fit is adopted between the inner diameter positioning surface of the front bearing support of the present invention and the front bearing, thereby improving the coaxiality fitting accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a cross-sectional view of a wet-running pump unit;

[0021] Figure 2 is a cross-sectional view of the rotor assembly;

[0022] Figure 3 This is a cross-sectional view of the front bearing support of the present invention;

[0023] Figure 4 A top view of the front bearing support of the present invention;

[0024] Figure 5This is a cross-sectional view of the shielding and sealing tank of the present invention.

[0025] Among them, 1 is the pump head assembly, 2 is the impeller, 3 is the impeller cover, 4 is the flat seal, 5 is the shielding seal tank, 6 is the front bearing support, 7 is the front bearing, 8 is the axial stop bearing, 9 is the stop bearing rubber sleeve, 10 is the rear bearing, 11 is the bearing elastic support assembly, 12 is the rotor assembly, 13 is the stator assembly, and 14 is the rotating shaft;

[0026] 16 is a permanent magnet, 17 is an inner sleeve of a permanent magnet, 18 is an outer sleeve of a permanent magnet, 19 is an end ring, 20 is a first folded edge, 21 is a first inner diameter, 22 is a second inner diameter, 23 is an inner and outer diameter connecting portion, 24 is an outer diameter positioning surface, 25 is an inner diameter positioning surface, 26 is a notch, 27 is an axial positioning surface, and Z is a center axis. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0028] like Figure 1 As shown, the present invention is installed in a wet-running pump unit, which includes a pump head assembly 1, an impeller 2, an impeller cover 3, a flat seal 4, a shielding seal tank 5, a front bearing 7, an axial stop bearing 8, a stop bearing rubber sleeve 9, a rear bearing 10, a bearing elastic support assembly 11, a rotor assembly 12, a stator assembly 13 and a rotating shaft 14.

[0029] like Figure 1 As shown, the bearing fixing structure includes a front bearing support 6, which includes an outer diameter positioning surface 24 and an inner diameter positioning surface 25 connected by an inner and outer diameter connecting portion 23. The outer diameter positioning surface 24 and the inner diameter positioning surface 25 share a central axis Z. The outer diameter positioning surface 24 is concentrically matched with the first inner diameter 21 of the shielding sealing tank 5, and the inner diameter positioning surface 25 is matched with the front bearing 7.

[0030] The outer diameter positioning surface 24 extends axially to form an axial positioning surface 27, which mates with the first folded edge 20 of the shielding and sealing can 5. This axial positioning surface 27 provides accurate axial positioning and support for the front bearing 7 via the shielding and sealing can 5. The axial relative position between the front bearing 7 and the rear bearing 10 is determined by the first folded edge 20 of the shielding and sealing can 5.

[0031] A small clearance fit is adopted between the outer diameter positioning surface 24 of the front bearing support 6 and the first inner diameter 21 of the shielding and sealing tank 5. The small clearance fit can make the inner diameter positioning surface 25 of the front bearing support 6 radially concentric with the first inner diameter 21 of the shielding and sealing tank 5. At the same time, the small clearance fit can also make the front bearing support 6, the front bearing 7, the rotor assembly 12, the impeller 2, and the impeller cover 3 be sent together into the first inner diameter 21 of the shielding and sealing tank 5 in the form of a combination, thereby simplifying and reducing the difficulty of assembly.

[0032] The inner diameter positioning surface 25 of the front bearing support 6 has an interference fit with the front bearing 7. When the front bearing 7 is squeezed into the inner diameter positioning surface 25, the clearance space of the inner and outer diameter connection portion 23 absorbs the deformation of the inner diameter positioning surface 25, thereby ensuring that the dimensional accuracy of the outer diameter positioning surface 24 is not affected. By properly selecting the tolerance and wall thickness of the inner diameter positioning surface 25, a reliable connection and radial concentric positioning between the inner diameter positioning surface 25 and the front bearing 7 can be achieved.

[0033] The outer peripheral edge of the axial positioning surface 27 has a set number of notches 26. The notches 26 can be circular or in other shapes. The notches 26 facilitate the circulation of liquid in terms of fluid mechanics.

[0034] The outer diameter positioning surface 24, the inner diameter positioning surface 25, and the inner and outer diameter connecting portion 23 are made of the same material and extend into a whole in the mold. The inner diameter positioning surface 25 of the front bearing support 6 is designed to serve as the coaxiality reference of the outer diameter positioning surface 24 and the verticality reference of the axial positioning surface 27.

[0035] The inner and outer diameter connecting portion 23, the outer diameter positioning surface 24, the inner diameter positioning surface 25, the notch 26 and the axial positioning surface 27 are integral components formed by extending the same material, which can be a metal material or a resin material.

[0036] The outer diameter positioning surface 24 and the inner diameter positioning surface 25 are provided with an avoidance space in the diameter direction. The outer diameter positioning surface 24 and the inner diameter positioning surface 25 are spaced apart in the diameter direction.

[0037] Through the technical features, the present invention achieves the following beneficial effects:

[0038] 1) The assembly accuracy of the front bearing 7 and the rear bearing 10 is high. On the one hand, the shielding sealing can has a first inner diameter 21 and a second inner diameter 22 with a close positional relationship and a common center reference. Whether it is stamping or turning, it is conducive to obtaining higher processing accuracy. At the same time, the processing is simple and the cost is relatively low. On the other hand, the outer diameter positioning surface 24 and the inner diameter positioning surface 25 supported by the front bearing are symmetrical in the circumferential direction and spaced apart in the diameter direction. The stamping and stretching forming process is used, the mold is simple, the forming accuracy is high, and concentricity is naturally guaranteed. When the inner diameter positioning surface 25 is pressed by the front bearing, even if there is a certain deformation, it is spaced apart from the outer diameter positioning surface 24 in the diameter direction, thereby ensuring that the outer diameter positioning accuracy is not affected. Therefore, compared with the matching relationship in the existing patent CN104040182A, the present invention not only improves the overall assembly accuracy, but also reduces the difficulty of parts processing.

[0039] 2) Assembly difficulty is reduced. A small clearance fit is used between the outer diameter positioning surface 24 of the front bearing support 6 and the first inner diameter 21 of the shielding and sealing can 5. The front bearing 7 and the front bearing support 6 can be assembled onto the rotor assembly 12 to form a single piece, which can then be assembled into the shielding and sealing can 5.

[0040] 3) An interference fit is adopted between the inner diameter positioning surface 25 of the front bearing support 6 and the front bearing 7 to improve the coaxiality fitting accuracy.

[0041] 4) The outer peripheral edge of the axial positioning surface 27 of the front bearing support 6 has a certain number of notches 26. The notches 26 facilitate the circulation of liquid into the inner side of the shielding and sealing tank 5 in terms of fluid mechanics, and can promote water circulation in the shielding and sealing tank 5.

[0042] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention 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 the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A bearing fixing structure, which is installed in a wet-running pump unit, wherein the wet-running pump unit comprises a shielding seal tank (5) and a front bearing (7), and is characterized in that: The bearing fixing structure includes a front bearing support (6), the front bearing support (6) includes an outer diameter positioning surface (24) and an inner diameter positioning surface (25), the outer diameter positioning surface (24) and the inner diameter positioning surface (25) are connected to form a whole through an inner and outer diameter connecting portion (23), the outer diameter positioning surface (24) and the inner diameter positioning surface (25) share a central axis (Z), the outer diameter positioning surface (24) is concentrically matched with the first inner diameter (21) of the shielding sealing tank (5), and the inner diameter positioning surface (25) is matched with the front bearing (7); The inner diameter positioning surface (25) is interference-fitted with the front bearing (7) and is radially concentrically arranged; the inner and outer diameter connecting portion (23) is provided with an escape space for absorbing deformation of the inner diameter positioning surface (25); the outer diameter positioning surface (24) extends an axial positioning surface (27) along the axial direction, and the axial positioning surface (27) is matched with the first folded edge (20) of the shielding sealing can (5); the axial positioning surface (27) provides accurate axial positioning and support for the front bearing (7) through the shielding sealing can (5); the outer peripheral edge of the axial positioning surface (27) has a set number of notches (26); The outer diameter positioning surface (24) and the inner diameter positioning surface (25) are provided with an avoidance space in the diameter direction; the outer diameter positioning surface (24) and the inner diameter positioning surface (25) are spaced apart in the diameter direction.

2. A bearing fixing structure according to claim 1, characterized in that: The inner and outer diameter connecting portion (23), the outer diameter positioning surface (24), the inner diameter positioning surface (25), the notch (26) and the axial positioning surface (27) are integral components obtained by extending the same material.

3. The bearing fixing structure according to claim 1, characterized in that: The inner diameter positioning surface (25) is designed as a coaxiality reference for the outer diameter positioning surface (24) and a perpendicularity reference for the axial positioning surface (27).

4. The bearing fixing structure according to claim 1, characterized in that: The notch (26) is a notch used to facilitate the circulation of liquid, and the notch includes but is not limited to a circular shape.

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