Connecting part of rotating shaft and impeller and wet operation pump unit with connecting part

Abstract

The utility model relates to a connecting part of a rotating shaft and an impeller and a wet operation pump unit with the same, the connecting part is installed on the wet operation pump unit, the wet operation pump unit comprises a pump head and a motor, the motor comprises a stator and a rotor, the rotor comprises the rotating shaft and the impeller, and the rotating shaft is connected with the impeller. The connecting part comprises an inner wall matched with the outer wall of the rotating shaft, a bottom face connected with the inner wall and a through hole used for achieving liquid path circulation, and the through hole is formed in the bottom face. Compared with the prior art, the utility model has the advantages of providing effective anti-blocking and rotor wet operation cooling at the same time and the like.

Description

Technical Field

[0001] The utility model relates to a wet-running pump unit, in particular to a connecting component between a rotating shaft and an impeller and a wet-running pump unit having the component. Background Art

[0002] In heating and cooling systems, centrifugal pumps are used in liquid environments. In contrast to dry centrifugal pumps, wet-running centrifugal pumps are typically characterized by the rotor and bearing support system being soaked in the liquid in the shielding tank. The shielding tank isolated between the stator and rotor converts the dynamic seal into a static seal, effectively preventing liquid leakage. Generally, the bearing support of a wet-running centrifugal pump is assembled on the shielding tank. On the one hand, it is used to support the bearing and be concentrically connected to the shielding tank. On the other hand, it isolates the shielding tank from the pump chamber into two relatively closed independent chambers, namely the impeller chamber and the rotor chamber. The rotating shaft of the wet-running centrifugal pump is placed in the rotor, which is the transmission device of the motor rotor and the impeller. When the wet-running centrifugal pump is working, the impeller rotates in the impeller chamber, forming fluid pressure, and discharges the fluid at the water inlet to the water outlet. At the same time, this flow characteristic is used in the design of the wet-running centrifugal pump to realize the function of the liquid entering the rotor chamber from the impeller chamber and returning to the impeller chamber. This requires the rotor chamber to have a circulation channel facing the impeller chamber. In the commonly used design, this circulation channel is established on the rotating shaft, that is, the rotating shaft has a hollow hole, and the liquid in the rotor chamber flows directly to the water inlet of the impeller chamber through the hollow hole. At this time, it is necessary to consider the diffusion effect when the fluid returns from the rotor chamber to the water inlet of the impeller chamber, that is, it is necessary to design the rotating shaft hollow hole as a local fine hole structure to achieve the purpose of interception. This local fine hole structure of the rotating shaft hollow hole is extremely difficult to process in manufacturing, and it is extremely difficult to demold even if it is molded.

[0003] After searching CN116517869A, a centrifugal pump of an electric motor is disclosed, specifically a ceramic hollow shaft which is easily processed and has stepped through holes coaxially arranged from the shaft head to the shaft tail. The structure can provide an effective liquid circulation loop and alleviate the problem of metal ions depositing into scale and affecting the normal operation of the shaft when the liquid flows. However, the processing cost of this structure is expensive during manufacturing, and cracks are easily generated at the stepped holes.

[0004] Therefore, in order to solve the above-mentioned defects of the prior art and provide an effective anti-clogging and rotor wet operation cooling solution, there is an urgent need for a connecting component between the rotating shaft and the impeller with a circulation channel function. Utility Model Content

[0005] The purpose of the utility model is to overcome the defects of the above-mentioned prior art and to provide a connecting component of the shaft and the impeller which can effectively prevent blockage and cool the rotor during wet operation, and a wet operation pump unit having the component.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] According to one aspect of the utility model, a connecting component between a rotating shaft and an impeller is provided, and the connecting component is installed on a wet-running pump unit, wherein the wet-running pump unit comprises a pump head and a motor, wherein the motor comprises a stator and a rotor, wherein the rotor comprises a rotating shaft and an impeller, and the connecting component comprises an inner wall matching the outer wall of the rotating shaft, a bottom surface connected to the inner wall, and a through hole for realizing liquid circulation, wherein the through hole is arranged on the bottom surface.

[0008] As a preferred technical solution, the number of the through hole is greater than or equal to 1, and the shape of the through hole is a standard geometric shape.

[0009] As a preferred technical solution, the rotating shaft is provided with a hollow hole for liquid circulation, and the cross-sectional area of ​​the hollow hole is larger than the cross-sectional area of ​​the through hole.

[0010] As a preferred technical solution, the inner wall and the outer wall of the rotating shaft are interference fit.

[0011] As a preferred technical solution, the width of the gap of the interference fit is 1% to 10% of the inner diameter of the through hole.

[0012] As a preferred technical solution, the connecting component also includes flat parts for axial and radial positioning of the impeller.

[0013] As a preferred technical solution, the bottom surface is connected to the impeller by molten material.

[0014] As a preferred technical solution, the bottom surface is a bottom surface formed when the melt flows on the inner wall toward the impeller during the injection molding of the impeller, or an integrated connecting component obtained by mechanical processing.

[0015] According to another aspect of the utility model, a wet-running pump unit having the connecting component is provided, comprising a pump head and a motor, wherein the pump head comprises an impeller chamber, the impeller chamber comprises an impeller chamber low-pressure zone and an impeller chamber high-pressure zone, the motor comprises a stator and a rotor, the rotor comprises a rotating shaft, a connecting component and an impeller, the rotating shaft drives the impeller to rotate through the connecting component, so as to enable liquid to flow from the impeller chamber high-pressure zone into the impeller chamber low-pressure zone to realize liquid circulation.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] 1) The utility model provides a connecting component between a rotating shaft and an impeller, wherein the rotating shaft adopts a hollow hole structure, the hollow hole is large to reduce flow resistance, there is no narrow hole inside, it is easy to process and manufacture, and the purpose of reducing the use cost is achieved;

[0018] 2) In order to provide an effective anti-blocking and rotor wet running cooling solution, the utility model opens a narrow through hole on the bottom surface of the connecting component to prevent fluid diffusion, avoid blockage, and cool the motor;

[0019] 3) The connection component of the utility model is biased toward one side of the impeller to form a bottom surface, which increases the overall rigidity of the connection component and reduces its deformation after being subjected to fluid pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0021] Figure 2 This is a schematic diagram of the rotating shaft structure of an embodiment of the utility model;

[0022] Figure 3 This is a schematic diagram of the flat connection structure between the impeller and the connecting component according to an embodiment of the utility model;

[0023] Figure 4 This is a schematic diagram of the cooperation between the rotating shaft and the connecting component according to an embodiment of the utility model;

[0024] Figure 5 A schematic diagram of a wet-running pump unit using an embodiment of the utility model;

[0025] FIG6( a ) is a schematic diagram of the fluid and circulation channel of the utility model;

[0026] FIG6( b ) is an enlarged view of fluid channels A and B in FIG6( a ).

[0027] Among them, 1 is a pump head, 2 is a motor, 3 is a stator, 4 is a rotor, 5 is a shielding tank, 6 is a front bearing support, 7 is a rear bearing support, 8 is a thrust bearing support, 9 is a front bearing, 10 is a rear bearing 10, 11 is a thrust bearing, 12 is a permanent magnet, 13 is a rotating shaft, 14 is a connecting component, 15 is an impeller, 16 is an inner stop, 17 is an outer stop, 18 is an outer surface, 19 is a flat position, 20 is a through hole, 21 is an inner wall, 22 is a bottom surface, 23 is an outer wall, 24 is a hollow hole, 25 is an impeller chamber, 26 is a rotor chamber, 27 is a low-pressure area of ​​the impeller chamber, 28 is a high-pressure area of ​​the impeller chamber, 29 is a first radial positioning surface, 30 is a second radial positioning surface, 31 is a first axial positioning surface, 32 is a second axial positioning surface, and A, B, C and D are fluid channels. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0029] Example 1

[0030] like Figure 1 and Figure 2 As shown, a connecting component for a rotating shaft and an impeller, the connecting component 14 is installed on a wet-running pump unit, the wet-running pump unit includes a pump head 1 and a motor 2, the motor includes a stator 3 and a rotor 4, the rotor includes a rotating shaft 13 and an impeller 15, the connecting component 14 includes an inner wall 21 matched with an outer wall 23 of the rotating shaft 13, a bottom surface 22 connected to the inner wall 21, and a through hole 20 for realizing liquid circulation, the through hole 20 is arranged on the bottom surface 21. The utility model also provides an effective anti-blocking and rotor wet-running cooling solution, a narrow through hole is opened on the bottom surface of the connecting component to achieve the purpose of preventing fluid diffusion, avoiding blockage, and cooling the motor.

[0031] The number of the through hole 20 is greater than or equal to 1, and the shape is a standard geometric shape. The inner wall 21 is interference-connected with the outer wall 23 of the rotating shaft 13. The gap of the interference connection is much smaller than the through hole 20. Specifically, the width of the gap of the interference connection is 1% to 10% of the inner diameter of the through hole 20.

[0032] The connecting component 14 further comprises a flat portion 19 for axial and radial positioning of the impeller 15 .

[0033] The rotating shaft 13 is provided with a hollow hole 24 for liquid circulation, and the cross-sectional area of ​​the hollow hole 24 is larger than the cross-sectional area of ​​the through hole 20. The utility model provides a connecting component between a rotating shaft and an impeller, wherein the rotating shaft adopts a hollow hole structure, the hollow hole is large to reduce flow resistance, there is no narrow hole inside, it is easy to process and manufacture, and the purpose of reducing the use cost is achieved.

[0034] The bottom surface 22 is connected to the impeller 15 by melt. The bottom surface 22 is formed by melt flowing on the inner wall 21 toward the impeller 15 during injection molding of the impeller 15, or is an integrated connection component obtained by mechanical processing.

[0035] Example 2

[0036] like Figure 3-6, the wet-running pump unit of the utility model comprises a pump head 1 and a motor 2, wherein the pump head 1 has an impeller chamber 25, and the impeller chamber 25 has an impeller chamber low-pressure area 27 and an impeller chamber high-pressure area 28; the motor 2 has a stator 3 and a rotor 4, the stator 3 has a shielding tank 5, a second radial positioning surface 30 of the shielding tank 5, a second axial positioning surface 32, a front bearing support 6, a first radial positioning surface 29 of the front bearing support 6, a first axial positioning surface 31, a rear bearing support 7, a thrust bearing support 8, a front bearing 9, a rear bearing 10 and a thrust bearing 11, and the rotor 4 has a permanent magnet 12, a rotating shaft 13, a rotating shaft and impeller connecting component 14, and an impeller 15.

[0037] In this structure, the inner stop 16 of the pump head 1 cooperates with the outer stop 17 of the motor 2, the shielding tank 5 is connected to the motor 2 through the outer surface 18, and the axial and radial positioning of the impeller 15 is achieved by connecting the flat part 19 of the connecting member 14, wherein the inner wall 21 of the connecting member 14 is interference fit with the working surface of the outer wall 23 of the rotating shaft 13. The first radial positioning surface 29 of the front bearing support 6 is assembled on the second radial positioning surface 30 of the shielding tank 5, and the assembly gap A, i.e., the fluid channel A, is retained. The first axial positioning surface 31 of the front bearing support 6 is assembled on the second axial positioning surface 32 of the shielding tank 5, and the assembly gap B, i.e., the fluid channel B, is retained. On the one hand, it is used to support the front bearing 9 and be concentrically connected to the shielding tank 5, and on the other hand, the shielding tank 5 is isolated from the pump chamber into two relatively closed independent chambers, i.e., the impeller chamber 25 and the rotor chamber 26. The two ends of the rotating shaft 13 are supported by the front bearing 9 and the rear bearing 10. The end close to the pump head 1 is the shaft head placed in the low-pressure area 27 of the impeller chamber, and the end away from the pump head 1 is the shaft tail that passes through the high-pressure area 28 of the impeller chamber to reach the shield tank 5.

[0038] When the pump unit is powered on, the shaft 13 rotates, driving the impeller 15 to pump water through the connecting component 14. The impeller 15 and the impeller chamber 25 of the pump head 1 work together to allow the liquid to enter from the low-pressure area 27 of the impeller chamber, and then flow out from the high-pressure area 28 of the impeller chamber. At the same time, the liquid in the high-pressure area 28 of the impeller chamber enters the shielding tank 5 through the fluid channels A and B and fills it up, thereby achieving cooling when the motor is working. When the inside of the shielding tank 5 is filled, the liquid will flow to the connecting component 14 through the hollow hole 24 built into the shaft 13, namely the fluid channel C, and then flow to the low-pressure area 27 of the impeller chamber from the through hole 20 of the connecting component 14, namely the fluid channel D, thereby achieving liquid circulation.

[0039] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A connecting component for a rotating shaft and an impeller, the connecting component (14) being mounted on a wet-running pump unit, the wet-running pump unit comprising a pump head (1) and a motor (2), the motor comprising a stator (3) and a rotor (4), the rotor comprising a rotating shaft (13) and an impeller (15), characterized in that: The connecting component (14) comprises an inner wall (21) matched with an outer wall (23) of the rotating shaft (13), a bottom surface (22) connected to the inner wall (21), and a through hole (20) for realizing liquid circulation, wherein the through hole (20) is arranged on the bottom surface (22).

2. A connecting component for a rotating shaft and an impeller according to claim 1, characterized in that: The number of the through hole (20) is greater than or equal to one, and the shape of the through hole (20) is a standard geometric shape.

3. The connecting component of the rotating shaft and the impeller according to claim 1, characterized in that: The rotating shaft (13) is provided with a hollow hole (24) for liquid circulation, and the cross-sectional area of ​​the hollow hole (24) is larger than the cross-sectional area of ​​the through hole (20).

4. The connecting component of the rotating shaft and the impeller according to claim 1, characterized in that: The inner wall (21) is interference-fitted with the outer wall (23) of the rotating shaft (13).

5. The connecting component of the rotating shaft and the impeller according to claim 4, characterized in that: The width of the interference fit gap is 1% to 10% of the inner diameter of the through hole (20).

6. The connecting component of the rotating shaft and the impeller according to claim 1, characterized in that: The connecting component (14) also includes a flat portion (19) for axial and radial positioning of the impeller (15).

7. The connecting component of the rotating shaft and the impeller according to claim 1, characterized in that: The bottom surface (22) and the impeller (15) are connected by molten material.

8. The connecting component of the rotating shaft and the impeller according to claim 7, characterized in that: The bottom surface (22) is a bottom surface formed when the melt flows on the inner wall (21) toward the impeller (15) during injection molding of the impeller (15), or an integrated connecting component obtained by mechanical processing.

9. A wet-running pump unit having a connecting component as claimed in any one of claims 1 to 8, characterized in that: The invention comprises a pump head (1) and a motor (2), wherein the pump head (1) comprises an impeller chamber (25), wherein the impeller chamber (25) comprises an impeller chamber low-pressure area (27) and an impeller chamber high-pressure area (28), wherein the motor comprises a stator (3) and a rotor (4), wherein the rotor comprises a rotating shaft (13), a connecting component (14) and an impeller (15), wherein the rotating shaft (13) drives the impeller (15) to rotate via the connecting component (14), so that liquid flows from the impeller chamber high-pressure area (28) into the impeller chamber low-pressure area (27), thereby realizing liquid circulation.

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