A wet-running pump unit based on magnetic drive

Abstract

The present invention relates to a wet-running pump unit based on magnetic drive, which includes a pump head assembly, an impeller, an impeller cover, a planar seal, a shielded seal tank, a front bearing support, a front bearing, an axial stop bearing, a stop bearing rubber sleeve, a spherical bearing, a spherical bearing support, a rotor assembly, a stator assembly and a rotating shaft. The shielded seal tank shields and seals the rotor assembly and the stator assembly. The front bearing is installed on the shielded seal tank through the front bearing support, and the spherical bearing is installed on the shielded seal tank through the spherical bearing support. The front bearing and the spherical bearing jointly support the rotor assembly. When the front bearing and the spherical bearing are not coaxial, the spherical bearing rotates freely along the center of the spherical bearing support. Compared with the prior art, the present invention has the advantages of reducing mechanical friction loss caused by non-concentricity between the front and rear bearings, etc.

Description

Technical Field

[0001] The present invention relates to a wet-running pump unit, and more particularly to a wet-running pump unit based on magnetic drive. Background Art

[0002] In the design of wet-running pump units, the moving part and the stator part are separated and isolated, that is, magnetic drive, so as to eliminate the dynamic seals of dry-running units and fundamentally eliminate the water leakage problem. In addition, since the rotor part includes bearings immersed in the liquid and is relatively sealed with the stator part, the bearings have the function of liquid lubrication. When the water pump impeller is entangled by debris, the bearings will not be damaged due to overheating of the motor overload. However, the rotor part is immersed in water, and it is required that the rotor part and the stator part are relatively shielded and sealed, which makes the motor structure very complex. The front and rear support bearings of the rotor are installed in the cans that shield and seal the stator, making it extremely difficult to ensure the coaxiality of the front and rear support bearings of the rotor. The non-concentricity of the front and rear support bearings also causes an increase in the frictional loss of the rotor, resulting in an increase in energy consumption, that is, an increase in electricity consumption, imposing a certain economic burden on users. How to ensure the concentricity of the front and rear bearings has become the key technology for energy conservation and consumption reduction of wet-running pump units.

[0003] After retrieval, Chinese Patent Publication No. CN104024643A discloses an electric drive pump unit with a motor designed as a sealed can having a bearing bracket, revealing the installation position of the bearing bracket and the function of the bearing bracket to center the bearing and fix it in the sealed can. However, this existing patent only discloses the structure of a single bearing centered and fixed in the sealed can, and does not solve the problem of concentricity of more than one bearing, that is, the front and rear bearings. In addition, the main function of this bearing bracket is elastic deformation. The elastic deformation of this bearing bracket makes the bearing always in a floating state, resulting in additional forces in the diameter direction of the rotor supported by the bearing and increasing the mechanical friction loss. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned defects existing in the prior art and provide a wet-running pump unit based on magnetic drive.

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

[0006] According to one aspect of the present invention, there is provided a wet-running pump unit based on magnetic drive, including a pump head assembly, an impeller, an impeller cover, a planar seal, a shielded seal can, a front bearing support, a front bearing, an axial stop bearing, a stop bearing rubber sleeve, a rotor assembly, a stator assembly, and a rotating shaft. The wet-running pump unit further includes a spherical bearing and a spherical bearing support. The spherical bearing support fixes the spherical bearing by holding it with a paired spherical resultant force. During installation, if the front bearing and the spherical bearing are not coaxial, the spherical bearing rotates freely along the center of the spherical bearing support, enabling the spherical bearing to have a centering function.

[0007] As a preferred technical solution, the automatic centering of the spherical bearing only occurs when the rotating shaft is assembled in the front bearing and the spherical bearing. During the operation of the motor, the spherical bearing is supported and fixed by the spherical bearing support.

[0008] As a preferred technical solution, the outer contour of the spherical bearing is spherical, and the inner contour is cylindrical. The outer contour and the inner contour are extended through the upper end face and the lower end face, and the upper end face and the lower end face are flat and perpendicular to the inner contour.

[0009] As a preferred technical solution, during centering, an external force is applied to the rotating shaft to make the cylindrical surface of the rotating shaft closely contact the inner wall of the spherical bearing, so that the spherical bearing rotates around the center of the spherical bearing support in the X-axis, Y-axis, and Z-axis directions respectively.

[0010] As a preferred technical solution, the shielding and sealing tank shields and seals the rotor assembly and the stator assembly;

[0011] The front bearing is installed on the shielding and sealing tank through the front bearing support, the spherical bearing is installed on the shielding and sealing tank through the spherical bearing support, and the front bearing and the spherical bearing jointly support the rotor assembly.

[0012] As a preferred technical solution, the first inner diameter of the shielding and sealing tank fixes the second flange supported by the front bearing in the circumferential direction;

[0013] The second inner diameter of the shielding and sealing tank fixes the first flange supported by the spherical bearing support in the circumferential direction;

[0014] The first hem of the shielding and sealing tank fixes the third hem supported by the front bearing support in the axial direction;

[0015] The stepped surface of the shielding and sealing tank positions the axial extension end surface of the spherical bearing support in the axial direction.

[0016] As a preferred technical solution, the shape of the first flange is circular.

[0017] As a preferred technical solution, the outer diameters of the front bearing and the spherical bearing are smaller than the inner diameter of the shielding and sealing tank;

[0018] The spherical bearing is inside the shielding and sealing tank and is placed in the spherical bearing support.

[0019] As a preferred technical solution, a plurality of notches are provided on the spherical bearing support along the circumferential direction of the spherical surface.

[0020] As a preferred technical solution, the shapes of the notches include but are not limited to square, V-shaped, U-shaped, and open circular.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1) The spherical bearing of the present invention is centered and fixed in the shielded sealed tank through the spherical bearing support. The spherical bearing support must have a paired spherical resultant force to hold the spherical bearing, and through the transmission of the rotating shaft, the spherical bearing can freely rotate in the X-axis, Y-axis, and Z-axis directions along the center of the spherical bearing support, so that the spherical bearing has the function of self-aligning.

[0023] 2) The self-aligning of the spherical bearing of the present invention only occurs when the rotating shaft is assembled in the front bearing and the spherical bearing. Through the transmission of the rotating shaft, the spherical bearing can freely rotate in the X-axis, Y-axis, and Z-axis directions along the center of the spherical bearing support.

[0024] 3) During the operation of the motor of the present invention, the spherical bearing is fixed by the spherical bearing support and cannot rotate freely, avoiding the traditional bearing support that fixes the bearing through elastic deformation, but making the bearing always in the state of the resistance of the elastic deformation of the bearing support. This state causes additional force in the diameter direction of the rotor supported by the bearing. The present invention avoids making the bearing always in the state of the resistance of the elastic deformation of the bearing support, reducing the mechanical friction loss of the non-alignment of the front and rear bearings. Description of the Drawings

[0025] Figure 1 It is a schematic cross-sectional structure diagram of the wet-running pump unit based on magnetic drive of the present invention;

[0026] Figure 2 It is a schematic installation diagram of the spherical bearing and the front bearing of the present invention in the shielded sealed tank;

[0027] Figure 3 It is a schematic diagram of the rotation of the spherical bearing of the present invention in the X-axis, Y-axis, and Z-axis directions along the center of the spherical bearing;

[0028] Figure 4 It is a schematic diagram of the spherical bearing support of the present invention having a paired spherical resultant force to hold the spherical bearing;

[0029] Figure 5 It is a schematic diagram of the shape of the spherical bearing support of the present invention;

[0030] Figure 6 It is a schematic structure diagram of the spherical bearing support with a square notch of the present invention;

[0031] Figure 7 It is a schematic structure diagram of the spherical bearing support with a V-shaped notch of the present invention;

[0032] Figure 8 It is a schematic structure diagram of the spherical bearing support with a U-shaped notch of the present invention;

[0033] Figure 9 Schematic diagram of the spherical bearing support structure with an open circular notch for the present invention.

[0034] Among them, 1 is the pump head assembly; 2 is the impeller; 3 is the impeller cover; 4 is the planar seal; 5 is the canned motor seal; 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 spherical bearing; 11 is the spherical bearing support; 12 is the rotor assembly; 13 is the stator assembly; 14 is the rotating shaft;

[0035] 16 is the outer contour; 17 is the inner contour; 18 is the upper end face; 19 is the lower end face; 20 is the second flange; 21 is the first hem; 23 is the third hem; 26 is the first flange; 27 is the axially extending end face; 28 is the notch; 33 is the first inner diameter; 34 is the second inner diameter; 35 is the stepped surface;

[0036] A is the rotation of the spherical bearing along the center of the spherical bearing in the Z-axis direction; B is the rotation of the spherical bearing along the center of the spherical bearing in the X-axis and Y-axis directions. Specific embodiments

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0038] The present invention relates to a wet-running pump unit, especially in the scenario of circulating liquid. In order to isolate the liquid from the motor stator, in the design of the wet-running pump unit, the rotor part and the stator part are separated and isolated, that is, magnetic drive, eliminating the dynamic seal, and fundamentally solving the problem of water leakage, creating good conditions for the application scenarios that generally adopt forced liquid circulation.

[0039] Such as Figure 1As shown in the figure, a wet-running pump unit based on magnetic drive includes a pump head assembly 1, an impeller 2, an impeller cover 3, a planar seal 4, a shielded seal tank 5, a front bearing support 6, a front bearing 7, an axial stop bearing 8, a stop bearing rubber sleeve 9, a spherical bearing 10, a spherical bearing support 11, a rotor assembly 12, a stator assembly 13, and a rotating shaft 14. The stator assembly 13 axially fixes the pump head assembly 1 through the planar seal 4. The stator assembly 13 fixes the shielded seal tank 5 in the axial and radial directions. The shielded seal tank 5 fixes the front bearing support 6 and the spherical bearing support 11 in the axial and radial directions respectively. The shielded seal tank 5 fixes the pump head assembly 1 in the radial direction. The front bearing support 6 and the spherical bearing support 11 fix the front bearing 7 and the spherical bearing 10 in the axial and radial directions respectively. The rotor assembly 12 includes the rotating shaft 14 and is restricted in the diameter direction by the front bearing 7 and the spherical bearing 10 through the rotating shaft 14. The axial stop bearing 8 is fixed on the rotor assembly through the stop bearing rubber sleeve 9. The rotor assembly 12 is restricted in the axial direction by the axial stop bearing 8. The impeller 2 and the impeller cover 3 are fixed together by hot melt welding technology. The impeller 2 is interference-fitted with the rotating shaft 14. When the pump unit is powered on and working, the rotor assembly 12 rotates to drive the impeller 2 to pump water. The impeller 2 and the cavity of the pump head assembly 1 work together to allow water to enter from the low-pressure area and flow out from the high-pressure area.

[0040] The front bearing 7 is installed on the shielded seal tank 5 through the front bearing support 6. The spherical bearing 10 is installed on the shielded seal tank 5 through the spherical bearing support 11. The front bearing 7 and the spherical bearing 10 jointly support the rotor assembly 12;

[0041] The spherical bearing support 11 must fix the spherical bearing 10 with a paired spherical resultant force to hold it. When the front bearing 7 and the spherical bearing 10 are not coaxial, the spherical bearing 10 rotates freely along the center of the spherical bearing support 11.

[0042] As Figure 2 and 5 shown, the first inner diameter 33 of the shielded seal tank 5 is provided with a second flange 20 for fixing the front bearing support 6 in the circumferential direction; the second inner diameter 34 of the shielded seal tank 5 is provided with a first flange 26 for fixing the spherical bearing support 11 in the circumferential direction; the first hem 21 of the shielded seal tank 5 is provided with a third hem 23 for fixing the front bearing support 6 in the axial direction; the stepped surface 35 of the shielded seal tank 5 is provided with an axially extending end surface 27 for positioning the spherical bearing support 11 in the axial direction. Among them, the shape of the first flange 26 is circular.

[0043] The outer diameters of the front bearing 7 and the spherical bearing 10 are smaller than the inner diameter of the shielded sealed tank 5; the spherical bearing 10 is inside the shielded sealed tank 5 and is placed in the spherical bearing support 11, and the spherical bearing support 11 is used in cooperation with the spherical bearing 10. The spherical bearing 10 can freely rotate around the center of the spherical bearing support in the X-axis, Y-axis, and Z-axis directions respectively as Figure 3 .

[0044] A plurality of notches 28 are provided on the spherical bearing support 11 along the circumferential direction of the spherical surface. The shape of the notch 28 can be any geometric shape such as Figures 6 - 9 , and the purpose is to cut open the spherical surface. The shape of the notch 28 includes but is not limited to square, V-shaped, U-shaped, and open circular shapes.

[0045] When the front bearing 7 and the spherical bearing 10 are not coaxial, the spherical bearing 10 can freely rotate around the center of the spherical bearing support 11 in the X-axis, Y-axis, and Z-axis directions; thus, the spherical bearing 10 has the function of self-aligning relative to the front bearing 7.

[0046] As Figure 4 shown, the outer contour 16 of the spherical bearing 10 is a spherical surface, and the inner contour 17 is a cylindrical surface. The outer contour 16 and the inner contour 17 are extended through the upper end surface 18 and the lower end surface 19. The upper end surface 18 and the lower end surface 19 are flat surfaces and perpendicular to the inner contour 17.

[0047] The self-aligning of the spherical bearing 10 only occurs when the rotating shaft 14 is assembled in the front bearing 7 and the spherical bearing 10. During the operation of the motor, the spherical bearing 10 is fixed by the spherical bearing support 11; that is, the self-aligning of the spherical bearing 10 only occurs once, and during the subsequent operation of the motor, the spherical bearing 10 cannot move anymore.

[0048] During the self-aligning, an external force is applied to the rotating shaft 14 to make the cylindrical surface of the rotating shaft 14 closely contact the inner wall of the spherical bearing 10, so that the spherical bearing 10 rotates around the center of the spherical bearing support 11 in the X-axis, Y-axis, and Z-axis directions respectively.

[0049] Based on the above technical concept of the present invention, the wet-running pump unit with magnetic drive can have one or more spherical bearings.

[0050] Through the above embodiments, the present invention obtains the following remarkable effects:

[0051] 1. The spherical bearing 10 is centrally fixed in the shielded sealed tank 5 through the spherical bearing support 11. The spherical bearing support 11 for fixing the spherical bearing 10 must have a paired spherical resultant force to hold the spherical bearing 10, and through the transmission of the rotating shaft 14, the spherical bearing 10 can freely rotate along the center of the spherical bearing support 11 in the X-axis, Y-axis, and Z-axis directions, so that the spherical bearing 10 has the function of self-aligning.

[0052] 2. The self-aligning of the spherical bearing 10 only occurs when the rotating shaft 14 is assembled in the front bearing 7 and the spherical bearing 10. Through the transmission of the rotating shaft 14, the spherical bearing 10 can freely rotate along the center of the spherical bearing support 11 in the X-axis, Y-axis, and Z-axis directions.

[0053] 3. During the operation of the motor when powered on, the spherical bearing 10 is fixed by the spherical bearing support 11 and cannot rotate freely, avoiding the situation where the traditional bearing support fixes the bearing through elastic deformation, but making the bearing always in the state of resisting the elastic deformation of the bearing support. This state causes additional forces in the diameter direction of the rotor supported by the bearing. The present invention avoids making the bearing always in the state of resisting the elastic deformation of the bearing support, reducing the mechanical friction loss caused by the non-alignment of the front and rear bearings.

[0054] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A wet-running pump unit based on magnetic drive, comprising a pump head assembly (1), an impeller (2), an impeller cover (3), a planar seal (4), a shielded seal tank (5), a front bearing support (6), a front bearing (7), an axial stop bearing (8), a stop bearing rubber sleeve (9), a rotor assembly (12), a stator assembly (13) and a rotating shaft (14), characterized in that, The wet-running pump unit further includes a spherical bearing (10) and a spherical bearing support (11). The spherical bearing support (11) fixes the spherical bearing (10) by holding it with a paired spherical resultant force. During installation, when the front bearing (7) and the spherical bearing (10) are not coaxial, the spherical bearing (10) rotates freely along the center of the spherical bearing support (11), enabling the spherical bearing (10) to have a self-aligning function; The outer contour (16) of the spherical bearing (10) is spherical, and the inner contour (17) is cylindrical. The outer contour (16) and the inner contour (17) are extended through the upper end face (18) and the lower end face (19). The upper end face (18) and the lower end face (19) are flat and perpendicular to the inner contour (17); The shielded seal tank (5) shields and seals the rotor assembly (12) and the stator assembly (13); The front bearing (7) is installed on the shielded seal tank (5) through a front bearing support (6), and the spherical bearing (10) is installed on the shielded seal tank (5) through a spherical bearing support (11). The front bearing (7) and the spherical bearing (10) jointly support the rotor assembly (12); The first inner diameter (33) of the shielded seal tank (5) fixes the second flange (20) of the front bearing support (6) in the circumferential direction; The second inner diameter (34) of the shielded seal tank (5) fixes the first flange (26) of the spherical bearing support (11) in the circumferential direction; The first flanging (21) of the shielded seal tank (5) fixes the third flanging (23) of the front bearing support (6) in the axial direction; The stepped surface (35) of the shielded seal tank (5) positions the axially extended end face (27) of the spherical bearing support (11) in the axial direction.

2. The wet-running pump unit based on magnetic drive according to claim 1, wherein The self-aligning of the spherical bearing (10) only occurs when the rotating shaft (14) is assembled in the front bearing (7) and the spherical bearing (10). During the operation of the motor, the spherical bearing (10) is fixed by the spherical bearing support (11).

3. The wet-running pump unit based on magnetic drive according to claim 2, wherein, During self-aligning, an external force is applied to the rotating shaft (14) to make the cylindrical surface of the rotating shaft (14) closely contact the inner wall of the spherical bearing (10), so that the spherical bearing (10) rotates around the center of the spherical bearing support (11) in the X-axis, Y-axis, and Z-axis directions respectively.

4. A wet-running pump unit based on magnetic drive according to claim 1, characterized in that The shape of the first flange (26) is circular.

5. A wet-running pump unit based on magnetic drive according to claim 1, characterized in that, The outer diameters of the front bearing (7) and the spherical bearing (10) are smaller than the inner diameter of the shielded seal tank (5); The spherical bearing (10) is inside the shielded seal tank (5) and is placed in the spherical bearing support (11).

6. A wet-running pump unit based on magnetic drive according to claim 1, characterized in that, The spherical bearing support (11) is provided with a plurality of notches (28) along the circumferential direction of the spherical surface.

7. A wet-running pump unit based on magnetic drive according to claim 6, characterized in that, The shapes of the notches (28) include but are not limited to square, V-shaped, U-shaped, and open circular.

Images