A magnetic drive pump unit with dry-wet separation

Abstract

The present invention relates to a magnetic drive pump unit for dry-wet separation, comprising a pump head assembly, an impeller, an impeller cover, a flat seal, a shielded sealing tank, a front bearing support, a front bearing, an axial stop bearing, a stop bearing rubber sleeve, a rear bearing, a bearing elastic support assembly, a rotor assembly, a stator assembly, and a rotating shaft. The front bearing support is provided with a through hole for discharging liquid from the impeller chamber, which is connected to the internal gap of the shielded sealing tank. The liquid discharged through the through hole fills the internal gap of the shielded sealing tank. The rotating shaft is provided with a pinhole for discharging liquid from the internal gap. Compared with the prior art, the present invention has the advantages of discharging impurities introduced by the liquid into the shielded sealing tank and reducing water resistance and eddy currents within the shielded sealing tank.

Description

Technical Field

[0001] The invention relates to a magnetic transmission pump unit, in particular to a dry-wet separation magnetic transmission pump unit. Background Art

[0002] The wet-running pump unit is divided into a pump head part and a motor part. The motor part is connected to the pump head through the stator casing. The wet-running pump unit separates the moving part and the stator part in the design, that is, magnetic transmission, thereby eliminating the dynamic seals of the dry-running unit and fundamentally eliminating the water leakage problem.

[0003] After searching, Chinese patent publication number CN108691781A discloses a pump assembly with a rotor shielding sleeve, which contains a rotor assembly and bearings. The rotor assembly includes a rotating shaft and a permanent magnet, etc. The liquid flowing in from the impeller water inlet acts as a lubricating medium between the rotating shaft and the bearing. At the same time, Chinese patent CN1104040182A introduces a disc-shaped bearing seat, which is used in conjunction with patent CN108691781A. The bearing seat has a through hole on the plane, and the through hole is for the liquid in the high-pressure area to pass through and fill the rotor shielding sleeve, and then pass through the through hole of the rotating shaft to form a circulation of liquid inside and outside the rotor shielding sleeve. However, how to quickly complete the internal and external circulation of the liquid in the rotor shielding sleeve to suppress poor lubrication between the rotating shaft and the bearing has become a technical problem that needs to be solved. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a dry-wet separation magnetic transmission pump unit.

[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 magnetic drive pump unit for dry-wet separation is provided, comprising a pump head assembly, an impeller, an impeller cover, a flat seal, a shielding and sealing tank, a front bearing support, a front bearing, an axial stop bearing, a stop bearing rubber sleeve, a rear bearing, a bearing elastic support assembly, a rotor assembly, a stator assembly, and a rotating shaft; the front bearing support is provided with a through hole for discharging liquid from an impeller chamber in which the impeller is located, the through hole being connected to an internal gap of the shielding and sealing tank; the liquid discharged through the through hole fills the internal gap of the shielding and sealing tank;

[0007] The rotating shaft is provided with a needle hole for discharging the liquid in the internal gap.

[0008] As a preferred technical solution, there are multiple through holes to form a fluid channel A; the needle eye is provided at the top of the rotating shaft to form a fluid channel D, and the rotating shaft is provided with a large-diameter hole for connecting the needle eye and the internal gap to form a fluid channel C; wherein the cross-sectional area of ​​the large-diameter hole is larger than the cross-sectional area of ​​the through hole, and the cross-sectional area of ​​the through hole is larger than the cross-sectional area of ​​the needle eye.

[0009] As a preferred technical solution, the needle eye is provided with an upper end surface and a lower end surface connected to the large diameter hole, and the upper end surface and the lower end surface are respectively perpendicular to the needle eye.

[0010] As a preferred technical solution, a fitting gap for liquid discharge is provided between the rotating shaft and the front bearing, and the fitting gap is communicated with the fluid channel A.

[0011] As a preferred technical solution, the front bearing support is provided with a first flange, a second flange, a first folded edge, a second folded edge and a third folded edge, and the through holes are distributed on the second folded edge.

[0012] As a preferred technical solution, the first inner diameter of the shielding sealing can fixes the second flange of the front bearing support in the circumferential direction.

[0013] As a preferred technical solution, the first folded edge of the shielding sealing can fixes the third folded edge of the front bearing support in the axial direction.

[0014] As a preferred technical solution, the second inner diameter of the shielding sealing can fixes the cylindrical outer diameter of the bearing elastic support assembly in the circumferential direction, and the step surface of the shielding sealing can fixes the end face of the bearing elastic support assembly in the axial direction.

[0015] As a preferred technical solution, the magnetic transmission pump unit further includes a bearing installation chamber, which is interference fit with the front bearing and fixes the front bearing in the diameter direction and the axial direction.

[0016] As a preferred technical solution, the bearing elastic support assembly is interference fit with the rear bearing to fix the rear bearing in the diameter direction and the axial direction.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1) The present invention provides a through hole on the front bearing support to form a fluid channel A; at the same time, a pinhole is reserved at the top of the rotating shaft to form a fluid channel D, thereby taking away the heat generated by the friction between the rotating shaft and the front and rear bearings, discharging impurities brought into the shielding and sealing tank by the liquid, and reducing the water resistance and eddy currents in the shielding and sealing tank.

[0019] 2) The impeller is naturally biased toward the impeller water inlet due to the centrifugal force of rotation and the high and low water pressure differences in the impeller chamber. Therefore, when the impeller is working, it drives the rotating shaft, and the axial thrust bearing in the rotor assembly is always under axial load, which increases the friction loss of the rotor assembly. In the present invention, when the liquid pressure inside the shielding sealing tank is greater than the external liquid pressure, the liquid is ejected from the pinhole reserved at the top of the rotating shaft to release the pressure, thereby ensuring the axial force balance of the impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic cross-sectional view of the structure of a magnetically driven pump unit for dry-wet separation according to the present invention;

[0021] Figure 2 This is a schematic cross-sectional view of the combined structure of the front bearing support and the shielding sealing tank of the present invention;

[0022] Figure 3 This is a schematic diagram of the internal cross-sectional structure of the shielding and sealing tank of the present invention;

[0023] FIG4( a ) is a schematic diagram of the three-dimensional structure of the front bearing support of the present invention;

[0024] FIG4( b ) is a schematic cross-sectional view of the front bearing support structure of the present invention;

[0025] Figure 5 This is a schematic structural diagram of the bearing elastic support assembly of the present invention;

[0026] Figure 6 This is a schematic cross-sectional view of the shielding and sealing tank of the present invention;

[0027] Figure 7 This is a schematic cross-sectional view of the rotor assembly of the present invention;

[0028] Figure 8 This is a schematic diagram of the cross-sectional structure of the rotating shaft of the present invention;

[0029] Figure 9 This is a liquid circuit diagram inside the shielding sealed tank of the present invention;

[0030] Figure 10 This is an enlarged view of the liquid circuit of the present invention.

[0031] 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;

[0032] 15 is the impeller chamber, 16 is the water inlet, 17 is the water outlet, 18 is the internal gap, 19 is the first flange, 20 is the second flange, 21 is the first folded edge, 22 is the second folded edge, 23 is the third folded edge; 24 is the confluence port;

[0033] 25 is a through hole, 26 is the outer diameter of the cylinder, 27 is the end face, 28 is the bearing mounting chamber, 29 is the needle eye, 30 is the upper end face, 31 is the lower end face, 32 is the large diameter hole, 33 is the first inner diameter, 34 is the second inner diameter, and 35 is the step surface. DETAILED DESCRIPTION

[0034] 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.

[0035] like Figure 1 、 Figure 4(a) and 4(b) As shown, a magnetic transmission pump unit for dry-wet separation includes a pump head assembly 1, an impeller 2, an impeller cover 3, a flat seal 4, a shielding and sealing tank 5, a front bearing support 6, 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; it is characterized in that the front bearing support 6 is provided with a through hole 25 for discharging the liquid in the impeller chamber 15 where the impeller 2 is located, and the through hole 25 is connected to the internal gap 18 of the shielding and sealing tank 5; the liquid discharged through the through hole 25 fills the internal gap 18 of the shielding and sealing tank 5, as shown in FIG. Figure 3 As shown;

[0036] like Figure 7 As shown, the rotating shaft 14 is provided with a needle hole 29 for discharging the liquid in the internal gap 18 .

[0037] like Figure 2 As shown, the principle of the present invention is as follows: a shielding and sealing tank 5 is used to relatively shield and seal the rotor assembly 12 and the stator assembly 13. When the impeller 2 rotates at high speed, an accelerated centrifugal force is generated at the maximum outer diameter of the impeller, thereby forming a high-pressure area in the impeller chamber 15 and a low-pressure area at the water inlet 16 of the impeller 2. The liquid in the high-pressure area is discharged from the larger water outlet 17 of the impeller chamber 15, and is also discharged from the confluence port 24 of the front bearing support 6 through the through hole 25. The liquid discharged from the confluence port 24 passes through the through hole 25 and fills the internal gap 18 of the shielding and sealing tank 5.

[0038] The through holes 25 are provided in plurality, forming a fluid channel A. The needle eye 29 is provided at the top of the rotating shaft 14, forming a fluid channel D. The rotating shaft 14 is provided with a large-diameter hole 32 for connecting the needle eye 29 and the internal gap 18, forming a fluid channel C. The fluid channel C>A>D.

[0039] The needle eye 29 is provided with an upper end surface 30 and a lower end surface 31 connected to the large diameter hole 32 , and the upper end surface 30 and the lower end surface 31 are respectively perpendicular to the needle eye 29 .

[0040] A fitting gap for liquid discharge is provided between the rotating shaft 14 and the front bearing 7 , and the fitting gap is communicated with the fluid channel A.

[0041] like Figure 4(a) and 4(b) The front bearing support 6 is provided with a first flange 19 , a second flange 20 , a first folded edge 21 , a second folded edge 22 and a third folded edge 23 , and the through holes 25 are distributed on the second folded edge 22 .

[0042] like Figure 6 As shown, the first inner diameter 33 of the shielding sealing can 5 fixes the second flange 20 of the front bearing support 6 in the circumferential direction, and the first folded edge 21 of the shielding sealing can 5 fixes the third folded edge 23 of the front bearing support 6 in the axial direction.

[0043] like Figure 5 As shown, the second inner diameter 34 of the shielding and sealing can 5 fixes the cylindrical outer diameter 26 of the bearing elastic support assembly 11 in the circumferential direction, and the step surface 35 of the shielding and sealing can 5 fixes the end surface 27 of the bearing elastic support assembly 11 in the axial direction.

[0044] As shown in FIG. 4( b ), the magnetic transmission pump unit further includes a bearing mounting chamber 28 , which is interference fit with the front bearing 7 and fixes the front bearing 7 in the diameter direction and the axial direction.

[0045] The bearing elastic support assembly 11 is interference-fitted with the rear bearing 10 to fix the rear bearing 10 in the diameter direction and the axial direction.

[0046] The front bearing 7 and the rear bearing 10 jointly support the rotor assembly 12 and define the rotor assembly 12 and the rotating shaft 14 in the circumferential direction. Figure 9 and 10 As shown, when the internal gap 18 of the shielding sealing tank 5 is filled with liquid, the liquid can be ejected from the needle eye of the rotating shaft 14 along the direction of ABCD; it can also be ejected from the fitting gap between the rotating shaft 14 and the front bearing 7 along the direction of ABEF or AEF.

[0047] Through the above technical features, the present invention has the following significant effects:

[0048] 1) In order to take away the heat generated by the friction between the rotating shaft 14 and the front bearing 7 and the rear bearing 10, discharge impurities brought into the shielding and sealing tank 5 by the liquid, and reduce the water resistance and eddy current in the shielding and sealing tank 5, the front bearing support 6 is designed to have a first flange 19, a second flange 20, a first folded edge 21, a second folded edge 22, a third folded edge 23, and a through hole 25 radially outward. The second folded edge 22 is provided with a plurality of distributed through holes 25, and the through holes 25 are used in conjunction with the bearing elastic support assembly 11 to form a fluid channel AB; a needle hole 29 is reserved at the top of the rotating shaft 14, and the shape of the needle hole 29 is designed to have a large diameter hole 32 connected to the upper end face 30 and the lower end face 31 to form a fluid channel CD.

[0049] 2) The impeller 2 is naturally biased toward the water inlet 16 of the impeller 2 due to the centrifugal force of rotation and the high and low water pressure difference in the impeller 2 chamber. Therefore, when the impeller 2 is working, it drives the rotating shaft 14, and always keeps the axial thrust bearing 8 in the rotor assembly 12 under axial load, which increases the friction loss of the rotor assembly 12. In the present invention, when the liquid pressure inside the shielding sealing tank 5 is greater than the external liquid pressure, the liquid is ejected from the pinhole 29 reserved at the top of the rotating shaft 14 to release the pressure, thereby ensuring the axial force balance of the impeller 2.

[0050] 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 magnetic drive pump unit for dry-wet separation, comprising a pump head assembly (1), an impeller (2), an impeller cover (3), a flat seal (4), a shielding seal tank (5), a front bearing support (6), 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); characterized in that: The front bearing support (6) is provided with a through hole (25) for discharging liquid from the impeller chamber (15) where the impeller (2) is located, and the through hole (25) is in communication with the internal gap (18) of the shielding sealing tank (5); the liquid discharged through the through hole (25) fills the internal gap (18) of the shielding sealing tank (5); The rotating shaft (14) is provided with a needle hole (29) for discharging liquid in the internal gap (18); The through holes (25) are provided in plurality, forming a fluid channel A; the needle eye (29) is provided on the top of the rotating shaft (14), forming a fluid channel D; the rotating shaft (14) is provided with a large diameter hole (32) for connecting the needle eye (29) and the internal gap (18), forming a fluid channel C; wherein the cross-sectional area of ​​the large diameter hole (32) is larger than the cross-sectional area of ​​the through hole (25), and the cross-sectional area of ​​the through hole (25) is larger than the cross-sectional area of ​​the needle eye (29); The front bearing support (6) is provided with a first flange (19), a second flange (20), a first folded edge (21), a second folded edge (22) and a third folded edge (23), and the through holes (25) are distributed on the second folded edge (22).

2. A dry-wet separation magnetic transmission pump unit according to claim 1, characterized in that: The needle eye (29) is provided with an upper end surface (30) and a lower end surface (31) connected to the large diameter hole (32), and the upper end surface (30) and the lower end surface (31) are respectively perpendicular to the needle eye (29).

3. A dry-wet separation magnetic transmission pump unit according to claim 1, characterized in that: A fitting gap for liquid discharge is provided between the rotating shaft (14) and the front bearing (7), and the fitting gap is communicated with the fluid channel A.

4. A dry-wet separation magnetic transmission pump unit according to claim 1, characterized in that: The first inner diameter (33) of the shielding sealing can (5) fixes the second flange (20) of the front bearing support (6) in the circumferential direction.

5. A dry-wet separation magnetic transmission pump unit according to claim 1, characterized in that: The first folded edge (21) of the shielding sealing can (5) fixes the third folded edge (23) of the front bearing support (6) in the axial direction.

6. A dry-wet separation magnetic transmission pump unit according to claim 1, characterized in that: The second inner diameter (34) of the shielding sealing pot (5) fixes the cylindrical outer diameter (26) of the bearing elastic support assembly (11) in the circumferential direction, and the step surface (35) of the shielding sealing pot (5) fixes the end surface (27) of the bearing elastic support assembly (11) in the axial direction.

7. A dry-wet separation magnetic transmission pump unit according to claim 1, characterized in that: The magnetic drive pump unit further comprises a bearing mounting chamber (28), wherein the bearing mounting chamber (28) is interference-fitted with the front bearing (7) and fixes the front bearing (7) in the diameter direction and the axial direction.

8. The dry-wet separation magnetic transmission pump unit according to claim 1, characterized in that: The bearing elastic support assembly (11) is interference-fitted with the rear bearing (10), fixing the rear bearing (10) in the diameter direction and the axial direction.

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