A wet-running pump unit with a shielded sealed tank

Abstract

The present invention relates to a wet-running pump unit with a shielded sealed tank, which comprises a pump head assembly, an impeller, an impeller cover, a flat sealing ring, a front bearing housing, 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 unit further comprises a shielded sealed tank for shielding and sealing the rotor assembly and the stator assembly. The shielded sealed tank is provided with a flange outer diameter and a flanging extending radially outwards at its axial end facing the pump head assembly. The flanging is provided with a convex edge extending radially outwards. The convex edge is concentrically connected to the flange outer diameter through the flanging. The flange outer diameter is in surface contact with the radial mating area of the pump head assembly, and the convex edge is in surface contact with the radial mating surface of the stator assembly, so that the stator assembly, the shielded sealed tank and the pump head assembly are concentrically connected. The shielded sealed tank provides an installation reference for the front bearing, the rear bearing and the pump head assembly. Compared with the prior art, the present invention has the advantages of fundamentally eliminating the water leakage problem, etc.

Description

Technical Field

[0001] The present invention relates to a wet-running pump unit, and more particularly to a wet-running pump unit having a shielded seal tank. Background Art

[0002] The wet-running pump unit is divided into a pump head assembly part and a motor part. The motor part is connected to the pump head through a stator housing. In the design of the wet-running pump unit, the moving part and the stator part are separated and isolated, that is, magnetic drive, so as to eliminate the dynamic seal of the dry-running unit and fundamentally eliminate the water leakage problem.

[0003] After retrieval, Chinese Patent Publication No. CN108691781A discloses a pump assembly having a rotor shield sleeve. The rotor shield sleeve has a lateral rotor shield sleeve flange surface assembled in the circumferential wall of the pump housing, wherein the lateral rotor shield sleeve flange surface has at least three radial protrusions closely abutted against the circumferential wall of the pump housing and makes the rotor shield sleeve concentric with the circumferential wall of the pump housing. It can be seen that the shielded seal tank needs to shield and seal the motor stator relative to the rotor shield and seal each other, and also needs to provide an installation reference for the bearing and the pump housing. Therefore, how to design a shielded seal tank with the above effects at the same time becomes a technical problem to be solved. Summary of the Invention

[0004] The purpose of the present invention is to provide a wet-running pump unit having a shielded seal tank to overcome the defects existing in the above-mentioned prior art.

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

[0006] According to an aspect of the present invention, there is provided a wet-running pump unit having a shielded seal tank, including a pump head assembly, an impeller, an impeller cover, a flat seal ring, a front bearing housing, 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 wet-running pump unit further includes a shielded seal tank for shielding and sealing the rotor assembly and the stator assembly.

[0007] The shielded seal tank is provided with a flange outer diameter and a flange extending radially outward at its axial end facing the pump head assembly. The flange is provided with a convex edge extending radially outward. The convex edge is concentrically connected to the flange outer diameter through the flange. The flange outer diameter is in surface contact with the radial mating region of the pump head assembly, and the convex edge is in surface contact with the radial mating surface of the stator assembly, so that the stator assembly, the shielded seal tank, and the pump head assembly are concentrically connected. At the same time, the shielded seal tank provides an installation reference for the front bearing, the rear bearing, and the pump head assembly.

[0008] As a preferred technical solution, the first inner diameter of the shielded sealed can fixes the second flange supporting the front bearing in the circumferential direction, the axial end of the shielded sealed can positions the third hem of the front bearing support in the axial direction, and the second inner diameter of the shielded sealed can fixes the outer diameter of the cylinder of the bearing elastic support assembly in the circumferential direction.

[0009] As a preferred technical solution, there is a stepped avoidance space between the flanging and the axial end in the axial direction; at the same time, there is a stepped avoidance space between the outer diameter of the flange and the flange edge in the radial direction.

[0010] As a preferred technical solution, the shielded sealed can further includes a flange inner diameter extending radially outward, and this flange inner diameter straddles the winding area of the stator assembly.

[0011] As a preferred technical solution, the first inner diameter of the shielded sealed can is concentrically connected to the outer diameter of the flange through the axial end.

[0012] As a preferred technical solution, the first inner diameter, the axial end, the outer diameter of the flange, and the flange edge of the shielded sealed can are parts formed by extending the same material.

[0013] As a preferred technical solution, an axial step is provided on the axial mating area surface of the pump head assembly in contact with the flat seal ring, and this axial step is provided with a stepped mating surface, and the compression rate of the flat seal ring is defined by the axial step and the stepped mating surface.

[0014] As a preferred technical solution, the shielded sealed can is provided with a stepped surface for fixing the end face of the bearing elastic support assembly in the axial direction.

[0015] As a preferred technical solution, the front bearing and the rear bearing define the rotor assembly and the rotating shaft in the circumferential direction.

[0016] As a preferred technical solution, after the shielded sealed can, the flat seal ring and the pump head assembly are assembled, inner nuts are provided at the four right angles of the pump head assembly and are locked by bolts.

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

[0018] 1) The shielded sealed can in the present invention shields and isolates the motor stator assembly from the rotor assembly and seals them from each other, and also provides an installation reference for the front bearing, the rear bearing and the pump head assembly.

[0019] 2) The shielded sealed can of the present invention axially connects the stator assembly, the shielded sealed can and the pump head assembly by relying on the flanging extending radially outward.

[0020] 3) An axial step is provided on the axial mating area surface of the flat seal ring of the pump head assembly of the present invention. This axial step is designed to have at least one step mating surface, which axially defines the compression amount of the flat seal ring, fundamentally eliminating the problem of water leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the wet-running pump unit with a shielded seal tank of the present invention;

[0022] Figure 2 is a schematic structural diagram of the shielded seal tank of the present invention;

[0023] Figure 3 is a schematic structural diagram of the pump head assembly of the present invention;

[0024] FIG. 4(a) is a schematic three-dimensional structural diagram of the front bearing support of the present invention;

[0025] FIG. 4(b) is a schematic cross-sectional structural diagram of the front bearing support of the present invention;

[0026] Figure 5 is a schematic structural diagram of the bearing elastic support assembly of the present invention;

[0027] Figure 6 is a schematic structural diagram of the iron core winding area of the present invention;

[0028] Figure 7 is a schematic structural diagram of the flat seal ring of the present invention;

[0029] Figure 8 is a schematic structural diagram of the stator housing of the present invention;

[0030] Figure 9 is a schematic structural diagram of the assembly of the pump head and the motor of the present invention;

[0031] wherein 1 is the pump head assembly, 2 is the impeller, 3 is the impeller cover, 4 is the flat seal ring, 5 is the shielded seal tank, 6 is the front bearing support, 7 is the front bearing, 8 is the axial stop bearing, 9 is the axial 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, 14 is the rotating shaft;

[0032] 15 is the axial end, 16 is the flange outer diameter, 17 is the flanging, 18 is the flange inner diameter, 19 is the first flange, 20 is the second flange, 21 is the flange edge, 22 is the second hem, 23 is the third hem, 24 is the bolt, 25 is the radial mating area surface, 26 is the cylinder outer diameter, 27 is the end face, 28 is the axial step, 29 is the step mating surface, 30 is the radial mating surface, 31 is the flat seal ring end face, 32 is the winding area, 33 is the first inner diameter, 34 is the second inner diameter, 35 is the step surface. DETAILED DESCRIPTION OF THE INVENTION

[0033] 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 protection scope of the present invention.

[0034] As Figure 1 shown, a wet-running pump unit with a shielded sealed tank includes a pump head assembly 1, an impeller 2, an impeller cover 3, a flat sealing ring 4, 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. The wet-running pump unit further includes a shielded sealed tank 5 for shielding and sealing the rotor assembly 12 and the stator assembly 13.

[0035] The stator assembly 13 axially fixes the pump head assembly 1 through the flat seal 4. The stator assembly 13 fixes the shielded sealed tank 5 in the axial direction and the radial direction. The shielded sealed tank 5 respectively fixes the front bearing support 6 and the bearing elastic support assembly 11 in the axial direction and the radial direction. The shielded sealed tank 5 fixes the pump head assembly 1 in the radial direction. The front bearing support 6 and the bearing elastic support assembly 11 respectively fix the front bearing 7 and the rear bearing 10 in the axial direction and the radial direction. The rotor assembly 12 includes a rotating shaft 14 and is restricted in the diameter direction by the front bearing 7 and the rear 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 operates, 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.

[0036] As Figure 2 shown, the shielded sealed tank 5 is provided with a flange outer diameter 16 and a flanging 17 extending radially outward at its axial end 15 facing the pump head assembly 1. The flanging 17 is provided with a convex edge 21 extending radially outward. The flange outer diameter 16 is in small clearance fit with the radial mating area surface 25 of the pump head assembly 1 to achieve concentric connection between the pump head assembly 1 and the shielded sealed tank 5. The convex edge 21 contacts the radial mating surface 30 of the stator assembly 13. As Figure 8 shown, so that the stator assembly 13, the shielded sealed tank 5, and the pump head assembly 1 are concentrically connected. At the same time, the shielded sealed tank 5 provides an installation reference for the front bearing 7, the rear bearing 10, and the pump head assembly 1.

[0037] The flanging 17 and the axial end 15 have a stepped avoidance space in the axial direction; at the same time, the outer diameter 16 of the flange and the convex edge 21 have a stepped avoidance space in the radial direction. The shielded sealed tank 5 further includes a radially outwardly extending inner diameter 18 of the flange, and the inner diameter 18 of the flange straddles the winding region 32 of the stator assembly 13, as Figure 7 shown.

[0038] As Figure 2 shown, the first inner diameter 33 of the shielded sealed tank 5 fixes the second flange 20 of the front bearing support 6 in the circumferential direction, the axial end 15 of the shielded sealed tank 5 positions the third hem 23 of the front bearing support 6 in the axial direction, and the second inner diameter 34 of the shielded sealed tank 5 fixes the outer diameter 26 of the cylinder of the bearing elastic support assembly 11 in the circumferential direction, as Figure 6 shown.

[0039] The first inner diameter 33 of the shielded sealed tank 5 is concentrically connected to the outer diameter 16 of the flange through the axial end 15, and the convex edge 21 of the shielded sealed tank 5 is concentrically connected to the outer diameter 16 of the flange through the flanging 17, and the flanging 17 is perpendicular to the outer diameter 16 of the flange.

[0040] The first inner diameter 33, the axial end 15, the outer diameter 16 of the flange, and the convex edge 21 of the shielded sealed tank 5 are components formed by extending the same material.

[0041] As Figure 3 shown, the axial mating region surface of the pump head assembly 1 contacting the flat seal ring 4 is provided with an axial step 28, and the axial step 28 is provided with a step mating surface 29. The compression rate of the flat seal ring 4 is defined by the axial step 28 and the step mating surface 29 to achieve the static seal of the flat seal ring.

[0042] The shielded sealed tank 5 is provided with a step surface 35 for fixing the end face 27 of the bearing elastic support assembly 11 in the axial direction. The front bearing 7 and the rear bearing 10 define the rotor assembly 12 and the rotating shaft 14 in the circumferential direction.

[0043] The axial displacement of the shielded sealed tank 5 of the present invention is limited by the compressed flat seal ring 4.

[0044] The radial displacement of the pump head assembly 1 of the present invention is limited by the outer diameter 16 of the flange or the convex edge 21 that extends radially outward of the shielded sealed tank 5.

[0045] As Figure 9 shown, after the shielded sealed tank 5, the flat seal ring 4, and the pump head assembly 1 are assembled, inner nuts are provided at the four right angles of the pump head assembly 1, and the motor part and the pump head part are locked together by bolts 24 to form the pump unit as a whole.

[0046] Through the above technical features, the present invention obtains the following specific technical effects:

[0047] 1) The shielded seal can 5 has a radially outwardly extending flange outer diameter 16 and a flanging 17 on its axial end 15 facing the pump head. The flange outer diameter 16 concentrically connects the pump head assembly and the shielded seal can in the area where it radially mates with the pump head; the shielded seal can 5 has a first inner diameter 33, a second inner diameter 34, and a stepped surface 35. The flange outer diameter 16 is coaxial with the first inner diameter 33, and the flanging 17 is perpendicular to the first inner diameter 33; the first inner diameter 33 is larger than the second inner diameter 34 to facilitate the bearing elastic support assembly 11 being press-fitted into the second inner diameter 34 with a smaller interference area; the radially outwardly extending flange inner diameter 18 of the shielded seal can is designed to span the winding area 32 of the stator; the radially outwardly extending flanging 17 of the shielded seal can 5 is designed to have a radially outwardly extending flange edge 21, and the flange edge 21 directly contacts the radial mating surface 30 of the stator. The shielded seal can 5 in the present invention shields and isolates the motor stator assembly 13 from the rotor assembly 12 and seals them from each other, and also provides an installation reference for the front bearing 7, the rear bearing 10, and the pump head assembly 1.

[0048] 2) The shielded seal can 5 axially connects the stator assembly 13, the shielded seal can 5, and the pump head assembly 1 by relying on the radially outwardly extending flanging 17.

[0049] 3) In the present invention, an axial step 28 is provided on the axial mating area surface of the pump head assembly 1 contacting the flat seal ring 4. The axial step 28 is designed to have at least one step mating surface 29, which axially defines the compression amount of the flat seal ring 4, fundamentally eliminating the water leakage problem.

[0050] 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 with a shielded sealed tank, comprising a pump head assembly (1), an impeller (2), an impeller cover (3), a flat sealing ring (4), 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 wet-running pump unit further includes a canned motor seal tank (5) for shielding and sealing the rotor assembly (12) and the stator assembly (13). The canned motor seal tank (5) is provided with a radially outwardly extending flange outer diameter (16) and a flange (17) at its axial end (15) facing the pump head assembly (1). The flange (17) is provided with a radially outwardly extending flange edge (21). The flange edge (21) is concentrically connected to the flange outer diameter (16) through the flange (17). The flange outer diameter (16) contacts the radially mating area surface (25) of the pump head assembly (1), and the flange edge (21) contacts the radially mating surface (30) of the stator assembly (13), so that the stator assembly (13), the canned motor seal tank (5) and the pump head assembly (1) are concentrically connected. At the same time, the canned motor seal tank (5) provides an installation reference for the front bearing (7), the rear bearing (10) and the pump head assembly (1).

2. The wet-running pump unit with a shielded sealed tank according to claim 1, wherein The first inner diameter (33) of the canned motor seal tank (5) fixes the second flange (20) of the front bearing carrier (6) in the circumferential direction. The axial end (15) of the canned motor seal tank (5) positions the third flange (23) of the front bearing carrier (6) in the axial direction. The second inner diameter (34) of the canned motor seal tank (5) fixes the outer diameter of the cylinder (26) of the bearing elastic support assembly (11) in the circumferential direction.

3. The wet-running pump unit with a shielded sealed tank according to claim 1, characterized in that, There is a stepped avoidance space between the flange (17) and the axial end (15) in the axial direction; at the same time, there is a stepped avoidance space between the flange outer diameter (16) and the flange edge (21) in the radial direction.

4. The wet-running pump unit with a shielded sealed tank according to claim 1, characterized in that, The canned motor seal tank (5) further includes a radially inwardly extending flange inner diameter (18), which spans the winding area (32) of the stator assembly (13).

5. The wet-running pump unit with a shielded sealed tank according to claim 4, characterized in that, The first inner diameter (33) of the canned motor seal tank (5) is concentrically connected to the flange outer diameter (16) through the axial end (15).

6. The wet-running pump unit with a shielded sealed tank according to claim 4, characterized in that, The first inner diameter (33), the axial end (15), the flange outer diameter (16) and the flange edge (21) of the canned motor seal tank (5) are parts formed by extending the same material.

7. The wet-running pump unit with a shielded sealed tank according to claim 1, characterized in that, The axial mating area surface of the pump head assembly (1) contacting the flat seal ring (4) is provided with an axial step (28), and the axial step (28) is provided with a step mating surface (29). The compression rate of the flat seal ring (4) is defined by the axial step (28) and the step mating surface (29).

8. A wet-running pump unit with a shielded sealed tank according to claim 1, characterized in that, The canned motor seal tank (5) is provided with a stepped surface (35) for fixing the end face (27) of the bearing elastic support assembly (11) in the axial direction.

9. The wet-running pump unit with a shielded sealed tank according to claim 1, characterized in that, The front bearing (7) and the rear bearing (10) circumferentially define the rotor assembly (12) and the rotating shaft (14).

10. The wet-running pump unit with a shielded sealed tank according to claim 1, characterized in that, After the canned motor seal tank (5), the flat seal ring (4) and the pump head assembly (1) are assembled, inner nuts are provided at the four right angles of the pump head assembly (1) and locked by bolts (24).

Images