An elastic support structure and a wet-running pump unit having the same

Abstract

The present invention relates to an elastic support structure and a wet-running pump unit having the same. The elastic support structure is installed in the wet-running pump unit, which includes a shielded sealing tank and a rear bearing. The elastic support structure comprises a bearing elastic support assembly fixed to the shielded sealing tank. The bearing elastic support assembly comprises an arched spring and an arched spring mounting seat. The arched spring mounting seat is a hollow cylinder having two or more open slots perpendicular to the inner diameter within the hollow cylinder. One side of the arched spring contacts the rear bearing, while the other side is fixed within the open slot. Compared with the prior art, the present invention has the advantages of preventing the bearing from being constantly floating or severely eccentric, reducing mechanical friction loss of the rotating shaft, and so on.

Description

Technical Field

[0001] The present invention relates to a wet-running pump unit, in particular to an elastic supporting structure and a wet-running pump unit having the structure. Background Art

[0002] The wet-running pump unit's design separates the moving element from the stator, using a magnetic transmission mechanism. This eliminates the dynamic seals typically found in dry-running units, fundamentally eliminating water leakage. Furthermore, because the rotor is immersed in water and sealed relative to the stator, the bearings are protected from burnout. If debris becomes entangled in the pump impeller, the bearings are protected from overheating and damage due to motor overload. However, since the rotor is immersed in hot water, the bearings in wet-running pump units are designed with mirror-finished ceramic material to resist corrosion and reduce friction noise. The wet-running pump unit's design requires shielding and sealing the rotor and stator, resulting in a complex motor structure. The front and rear rotor support bearings are mounted in a can that shields and seals the stator, making coaxiality extremely difficult to ensure. Press-fitting the ceramic bearings directly into the shielded can creates challenges with precision machining. Excessive interference can cause the ceramic bearings to fracture. Ensuring the concentricity of the front and rear bearings and securing them securely within the can are key technologies for wet-running pump units.

[0003] After searching, Chinese Patent Publication No. CN104024643A discloses an electrically driven pump unit with a sealed can motor, including a bearing bracket. The patent details the bearing bracket's mounting location and its function of centrally securing the bearing within the sealed can. However, this existing patent only discloses a structure in which a single bearing is centrally secured within the sealed can, failing to address the concentricity between the bearing and the shielded sealed can. Furthermore, the primary function of the bearing bracket is elastic deformation. When the ceramic bearing is pressed into the bearing bracket, the elastic deformation of the bearing bracket allows the outer diameter of the ceramic bearing to expand the radially protruding segmented inner circle of the bearing bracket, allowing the outer diameter of the ceramic bearing to be clamped under the reaction force of the bearing bracket's elastic deformation. The bearing bracket has a complex structure, and the radially protruding segmented inner circle has multiple load-bearing surfaces, resulting in inconsistent force references and a failure to ensure consistency in the elastic deformation displacement and force of the multiple segmented circles. The ceramic bearing, secured by the bearing bracket, is constantly in a floating or severely eccentric state, increasing mechanical friction loss on the rotating shaft. Summary of the Invention

[0004] The purpose of the present invention is to provide an elastic support structure and a wet-running pump unit having the structure in order to overcome the defects of the 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, an elastic support 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 rear bearing, and the elastic support structure includes a bearing elastic support assembly fixed on the shielding sealing tank, and the bearing elastic support assembly includes an arched spring clip and an arched spring clip mounting seat, and the arched spring clip mounting seat is a hollow cylinder, and the inner diameter of the hollow cylinder has two or more open grooves perpendicular to the inner diameter, and one side of the arched spring clip is in contact with the rear bearing, and the other side is fixed in the open groove.

[0007] As a preferred technical solution, the open groove extends on any one end surface of the hollow cylinder and is provided with a raised step in a radial direction toward the inner diameter of the hollow cylinder, and the raised step cooperates with the arched spring.

[0008] As a preferred technical solution, the arched spring piece includes a front side and a back side, wherein the front side is provided with a front vertex in contact with the force-bearing surface of the rear bearing, and the back side is provided with a back vertex in contact with the force-bearing surface of the opening groove; or the front side is provided with a front vertex in contact with the force-bearing surface of the opening groove, and the back side is provided with a back vertex in contact with the force-bearing surface of the rear bearing.

[0009] As a preferred technical solution, the front or back side of the arched spring piece is provided with a through hole for use with the raised step.

[0010] As a preferred technical solution, the shape of the hollow interior of the arched shrapnel mounting seat includes but is not limited to circle, rectangle, square, ellipse and triangle.

[0011] As a preferred technical solution, the shapes of the arched springs include but are not limited to rectangle, cross shape and L shape.

[0012] As a preferred technical solution, the arched spring piece is a component formed by metal stamping, and the arched spring piece mounting seat is a component formed by metal processing or plastic injection.

[0013] According to another aspect of the present invention, a wet-running pump unit with an elastic support structure is provided, including a pump head assembly, an impeller, an impeller cover, a flat seal, a shielding sealing tank, a front bearing support, a front bearing, an axial stop bearing, a stop bearing rubber sleeve, a rear bearing, a rotor assembly, a stator assembly and a rotating shaft. The wet-running pump unit also includes the elastic support structure, and the elastic support structure includes a bearing elastic support assembly fixed on the shielding sealing tank.

[0014] As a preferred technical solution, the front bearing and the rear bearing are hollow cylinders made of ceramic material.

[0015] As a preferred technical solution, the arched spring clip mounting seat does not directly contact the rear bearing.

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

[0017] 1. The elastic support structure of the present invention makes the force reference of the rear bearing consistent, preventing the bearing from being in a floating or severely eccentric state at all times, and reducing the mechanical friction loss of the rotating shaft;

[0018] 2. The inner diameter of the hollow cylinder of the arched spring clip mounting seat of the present invention has a plurality of open grooves perpendicular to the inner diameter. The open grooves extend on any side of the end face of the hollow cylinder. A raised step facing the radial direction of the inner diameter of the hollow cylinder is provided on the force-bearing surface of the open groove. The raised step is used in conjunction with the through hole to ensure that the arched spring clip will not fall from the open groove, thereby improving reliability.

[0019] 3. The arched spring piece of the bearing elastic support assembly of the present invention is designed to have only one surface when viewed from the front projection view, and to have two surfaces, namely the front and back surfaces, when viewed from the top projection view. The front vertex of the arched spring piece contacts the load-bearing surface of the rear bearing, and the back vertex contacts the load-bearing surface of the open groove of the arched spring piece mounting seat. The front and back surfaces of the arched spring piece can be arbitrarily exchanged or used in combination with the load-bearing surface of the rear bearing and the load-bearing surface of the open groove, so that the rear bearing is not always supported by the elastic deformation of the spring piece due to the direction of the arch of the arched spring piece. Its good elastic deformation ability enables the rear bearing to be centrally distributed in the shielding sealing can.

[0020] 4. The inner diameter of the hollow cylinder of the present invention is the passing position of the rear bearing, and the arch spring piece mounting seat does not directly contact the rear bearing, thereby ensuring that the displacement space and elastic force application conditions of the arch spring piece's elastic deformation will not be interfered with by the shape and position tolerances of other matching parts. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 2 This is a cross-sectional view of the front bearing support and shielding sealing tank of the present invention

[0023] Figure 3 This is a structural diagram of the bearing elastic support assembly of the present invention.

[0024] Figure 4 This is a schematic diagram of a top view projection of an arched spring piece according to the present invention;

[0025] Figure 5 This is a schematic structural diagram of the arched spring clip mounting seat of the present invention;

[0026] Figure 6 It is a structural schematic diagram of the rear bearing of the present invention;

[0027] Figure 7This is a schematic diagram of the front projection of the arched spring piece of the present invention;

[0028] Figure 8(a) to Figure 8(d) Schematic diagrams of several shapes of arched shrapnel mounting seats with a solid exterior and a hollow interior;

[0029] Figure 9(a) to Figure 9(c) Schematic diagrams of several arbitrary geometric shapes of arched shrapnel;

[0030] Figure 10 A diagram showing the coordination between the arched spring piece through hole and the raised step of the arched spring piece mounting seat opening slot;

[0031] 1 is the pump head, 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 inner diameter of the hollow cylinder, 20 is the second flange, 21 is the first folded edge, 22 is the open groove, 23 is the third folded edge, 26 is the outer diameter of the hollow cylinder, 27 is the end face, 28 is the arched spring piece, 29 is the arched spring piece mounting seat, 30 is the raised step, 31 is the front, 32 is the back, 33 is the first inner diameter, 34 is the second inner diameter, 35 is the step surface, 36 is the front vertex, 37 is the rear bearing force surface, 38 is the back vertex, 39 is the open groove force surface, and 41 is the through hole. DETAILED DESCRIPTION

[0033] 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.

[0034] like Figure 1 and Figure 3 As shown, an elastic support structure is installed in a wet-running pump unit, which includes a shielding and sealing tank 5 and a rear bearing 10. The elastic support structure includes a bearing elastic support assembly 11 fixed on the shielding and sealing tank 5. The bearing elastic support assembly 11 includes an arched spring clip 28 and an arched spring clip mounting seat 29. The arched spring clip mounting seat 29 is a hollow cylinder. The inner diameter 15 of the hollow cylinder has two or more open grooves 22 perpendicular to the inner diameter. One side of the arched spring clip 28 is in contact with the rear bearing 10, and the other side is fixed in the open groove 22.

[0035] like Figure 5As shown, the opening groove 22 extends on any one side of the end surface 27 of the hollow cylinder and is provided with a raised step 30 in the radial direction toward the inner diameter 15 of the hollow cylinder. The raised step 30 cooperates with the arched spring piece 28.

[0036] like Figure 4 As shown, the arched spring piece 28 of the bearing elastic support assembly 11 has only one surface when viewed from the front projection view, and has two surfaces when viewed from the top projection, which are divided into a front surface 31 and a back surface 32. The front vertex 36 of the arched spring piece 28 contacts the rear bearing force surface 37, and the back vertex 38 contacts the open slot force surface 39. The front 31 and back 32 of the arched spring piece 28 can be arbitrarily exchanged and used in combination with the rear bearing force surface 37 and the open slot force surface 39, so that the rear bearing 10 is not always supported by the elastic deformation of the spring piece due to the arched orientation of the arched spring piece 28. The arched spring piece 28 has good elastic deformation ability, which can make the rear bearing 10 distributed centrally in the shielding sealing can 5. A through hole 41 is provided on the front 31 or back 32 of the arched spring piece 28, and the through hole 41 is used in conjunction with the raised step 30 of the open slot 22 to ensure that the arched spring piece 28 will not fall from the open slot 22, as shown in FIG. Figure 7 shown.

[0037] like Figure 8(a) to Figure 8(d) As shown, the shape of the hollow interior of the arched shrapnel mounting seat 29 includes but is not limited to circle, rectangle, square, ellipse and triangle.

[0038] Figure 9(a) to Figure 9(c) The shapes of the arched spring piece 28 include but are not limited to a rectangle, an X-shape and an L-shape.

[0039] The arched spring piece 28 is a component formed by metal stamping, and the arched spring piece mounting seat 29 is a component formed by metal processing or plastic injection.

[0040] The present invention achieves the following technical effects through the above features:

[0041] 1) The inner diameter 15 of the hollow cylinder of the arched spring clip mounting seat 29 has a plurality of open slots 22 perpendicular to the inner diameter. The open slots 22 extend on either side of the end face 27 of the hollow cylinder. A raised step 30 facing the radial direction of the inner diameter 15 of the hollow cylinder is provided on the force-bearing surface 39 of the open slot. The raised step 30 is used in conjunction with the through hole 41 to ensure that the arched spring clip 28 will not fall out of the open slot 22.

[0042] 2) The arched spring clip 28 of the bearing elastic support assembly 11 is designed to have only one surface when viewed from the front projection view, and two surfaces when viewed from the top projection view, namely the front 31 and the back 32. The front vertex 36 of the arched spring clip 28 contacts the rear bearing force surface 37, and the back vertex 38 contacts the open groove force surface 39 of the arched spring clip mounting seat 29. The front 31 and back 32 of the arched spring clip can be arbitrarily exchanged or used in combination with the rear bearing force surface 37 and the open groove force surface 39 so that the rear bearing 10 is not always supported by the elastic deformation of the spring clip due to the arched direction of the arched spring clip 28. Its good elastic deformation ability enables the rear bearing 10 to be centrally distributed in the shielding sealing can 5.

[0043] 3) The inner diameter 15 of the hollow cylinder is the passage position of the rear bearing 10, and the arched spring clip mounting seat 29 does not directly contact the rear bearing 10, thereby ensuring that the displacement space and elastic force application conditions for the elastic deformation of the arched spring clip 28 will not be interfered with by the shape and position tolerances of other mating parts.

[0044] Example 2

[0045] The present invention also provides a wet-running pump unit with an elastic support structure, including 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 rotor assembly 12, a stator assembly 13 and a rotating shaft 14. The wet-running pump unit also includes the elastic support structure, which includes a bearing elastic support assembly 11 fixed on the shielding and sealing tank 5.

[0046] The outer diameters of the front bearing 7 and the rear bearing 10 are respectively smaller than the first inner diameter 33 and the second inner diameter 34 of the shielding sealing can 5. 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. The second inner diameter 34 of the shielding sealing can 5 fixes the hollow cylindrical outer diameter 26 of the bearing elastic support assembly 11 in the circumferential direction, and the step surface 35 of the shielding sealing can 5 fixes the end face 27 of the bearing elastic support assembly 11 in the axial direction. The front bearing support 6, the bearing elastic support assembly 11, the front bearing 7, and the rear bearing 10 jointly support the rotor assembly 12 and limit the rotor assembly 12 and the rotating shaft 14 in the circumferential direction.

[0047] The front bearing 7 and the rear bearing 10 are hollow cylinders made of ceramic material. The arched spring mounting seat 29 does not directly contact the rear bearing 10.

[0048] 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. An elastic support structure, which is installed in a wet-running pump unit, wherein the wet-running pump unit comprises a shielding seal tank (5) and a rear bearing (10), and is characterized in that: The elastic support structure includes a bearing elastic support assembly (11) fixed on the shielding sealing tank (5), the bearing elastic support assembly (11) includes an arched spring piece (28) and an arched spring piece mounting seat (29), the arched spring piece mounting seat (29) is a hollow cylinder, the inner diameter (15) of the hollow cylinder has two or more open grooves (22) perpendicular to the inner diameter, one side of the arched spring piece (28) contacts the rear bearing (10), and the other side is fixed in the open groove (22); The opening groove (22) extends on any one side of the end surface (27) of the hollow cylinder and is provided with a raised step (30) in a radial direction toward the inner diameter (15) of the hollow cylinder, and the raised step (30) cooperates with the arched spring (28); The arched spring piece (28) includes a front side (31) and a back side (32), wherein the front side (31) is provided with a front vertex (36) in contact with the rear bearing surface (37), and the back side (32) is provided with a back vertex (38) in contact with the opening slot bearing surface (39); or the front side (31) is provided with a front vertex (36) in contact with the opening slot bearing surface (39), and the back side (32) is provided with a back vertex (38) in contact with the rear bearing surface (37); The front side (31) or the back side (32) of the arched spring piece (28) is provided with a through hole (41) for use with the raised step (30).

2. The elastic support structure according to claim 1, characterized in that: The shape of the hollow interior of the arched shrapnel mounting seat (29) includes but is not limited to a circle, a rectangle, a square, an ellipse and a triangle.

3. The elastic support structure according to claim 1, characterized in that: The shape of the arched shrapnel (28) includes but is not limited to a rectangle, an X-shape and an L-shape.

4. The elastic support structure according to claim 1, characterized in that: The arched shrapnel (28) is a component formed by metal stamping, and the arched shrapnel mounting seat (29) is a component formed by metal processing or plastic injection.

5. A wet-running pump unit with an elastic support structure, 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 rotor assembly (12), a stator assembly (13) and a rotating shaft (14), characterized in that: The wet-running pump unit further comprises the elastic support structure according to any one of claims 1 to 4, wherein the elastic support structure comprises a bearing elastic support assembly (11) fixed on the shielding sealing tank (5).

6. A wet-running pump unit with an elastic support structure according to claim 5, characterized in that: The front bearing (7) and the rear bearing (10) are hollow cylinders made of ceramic material.

7. A wet-running pump unit with an elastic support structure according to claim 5, characterized in that: The arched shrapnel mounting seat (29) does not directly contact the rear bearing (10).

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