Impeller assembly for centrifugal pump

Abstract

The utility model discloses an impeller assembly for a centrifugal pump. The impeller assembly comprises an impeller and a first cover body covering the impeller. The first cover body is provided with a liquid flow channel, and the liquid flow channel penetrates through the first end face and the second end face, opposite to each other, of the first cover body in the thickness direction of the first cover body. The impeller is opposite to the first end face and comprises a shaft body and a plurality of blades, wherein part of the shaft body extends into the liquid flow channel, and the blades extend outwards from the side portion of the shaft body in a curve mode and are arranged in the circumferential direction of the shaft body at intervals. Each blade inclines relative to the axis of the shaft body, each blade comprises a first part and a second part which are arranged in the axial direction of the shaft body in a stepped mode, the first part is located in the liquid flow channel, and the second part is located outside the liquid flow channel and faces the first end face. The impeller assembly for the centrifugal pump can reduce energy consumption.

Description

Technical Field

[0001] The utility model relates to a centrifugal pump, in particular to an impeller assembly for a centrifugal pump. Background Art

[0002] As is well known, a centrifugal pump is a pump that uses the centrifugal force generated by the rotation of an impeller to transport liquids, and is widely used in liquid transportation applications.

[0003] Among them, in the existing impeller assembly of a centrifugal pump, it includes an upper cover, a lower cover, and an impeller located between the upper cover and the lower cover. The impeller includes blades and a shaft body welded to the lower cover. The blades are welded between the lower cover and the upper cover, and the upper cover is provided with a liquid flow channel for the external liquid to flow into the impeller assembly. Therefore, during the rotation of the impeller assembly, the liquid entering from the liquid flow channel from the outside is transported by the rotating impeller through centrifugal force.

[0004] However, in the existing impeller assembly of a centrifugal pump, the external liquid directly hits the lower cover and then turns back, resulting in energy waste. At the same time, since the impeller is welded to the lower cover, the consistency of the impeller assembly is poor, and the vibration and noise generated during rotation are serious, resulting in the inability of the impeller assembly to adapt to high-speed occasions.

[0005] Therefore, there is an urgent need for an impeller for a centrifugal pump to overcome one or more of the above defects. Summary of the Utility Model

[0006] The purpose of the utility model is to provide an impeller for a centrifugal pump, which can reduce energy waste.

[0007] To achieve the above purpose, the impeller assembly for a centrifugal pump of the utility model includes an impeller and a first cover covering the impeller. The first cover is provided with a liquid flow channel, and the liquid flow channel penetrates the opposite first end face and second end face of the first cover in the thickness direction of the first cover. The impeller faces the first end face, and the impeller includes a shaft body partially extending into the liquid flow channel and a plurality of blades that curve outward from the side of the shaft body and are arranged at intervals in the circumferential direction of the shaft body; each blade is inclined relative to the axis of the shaft body, and each blade includes a first part and a second part that are arranged in a stepped manner in the axial direction of the shaft body. The first part is located in the liquid flow channel, and the second part is located outside the liquid flow channel and faces the first end face.

[0008] Compared with the prior art, with the design of "each blade includes a first part and a second part that are arranged in steps axially of the shaft body, the first part is located inside the liquid flow channel, and the second part is located outside the liquid flow channel and faces the first end face", the liquid entering the liquid flow channel from the outside directly acts on the first part of the blade, effectively preventing the liquid entering the liquid flow channel from hitting the second cover and being reflected, resulting in energy waste. Thus, the impeller assembly for a centrifugal pump of the present utility model can reduce energy consumption. Additionally, with the design of "the second cover and the impeller form an integral structure through powder metallurgy injection molding", the consistency and dynamic balance of the impeller assembly for a centrifugal pump of the present utility model are ensured. On the one hand, the volume of the impeller assembly for a centrifugal pump of the present utility model can be made smaller; on the other hand, the impeller assembly for a centrifugal pump of the present utility model has low vibration and low noise, and can be applied to high-speed occasions.

[0009] Preferably, the inclination of the first part relative to the shaft body is greater than the inclination of the second part relative to the shaft body.

[0010] Preferably, the impeller assembly for a centrifugal pump of the present utility model further includes a second cover, and the second cover is fixedly connected to the side of the impeller facing away from the first end face.

[0011] Preferably, the second cover and the impeller form an integral structure through powder metallurgy injection molding.

[0012] Preferably, the second cover is perpendicular to the axis of the shaft body, and the second cover, the second part, and the shaft body form an integral structure.

[0013] Preferably, the second cover is disc-shaped.

[0014] Preferably, the first cover includes an axial ring body and a radial ring body that radially protrudes from the axial ring body and is connected to the axial ring body. The internal space of the radial ring body forms the liquid flow channel. The end face of the radial ring body facing the second part forms the first end face, and the end face of the axial ring body away from the radial ring body forms the second end face.

[0015] Preferably, the axial ring body and the radial ring body are coaxially arranged; the axial ring body and the radial ring body form an integral structure through stamping.

[0016] Preferably, the radial ring body is circular.

[0017] Preferably, the shaft body is provided with a mounting hole; the mounting hole is a square hole with arcs on opposite sides. Description of the Drawings

[0018] Figure 1It is a perspective view of the impeller assembly for a centrifugal pump of the present utility model.

[0019] Figure 2 is Figure 1 the perspective exploded view of the impeller assembly for a centrifugal pump shown.

[0020] Figure 3 is Figure 1 the plan view of the impeller assembly for a centrifugal pump shown viewed from top to bottom.

[0021] Figure 4 is Figure 3 the internal view sectioned along the B-B line in

[0022] Figure 5 is Figure 1 the perspective view after hiding the first cover body.

[0023] Figure 6 is Figure 5 the plan view viewed from top to bottom. Specific embodiments

[0024] In order to describe in detail the technical content and structural features of the present utility model, the following further description is made in conjunction with the embodiments and with reference to the drawings.

[0025] The impeller assembly for a centrifugal pump of the present utility model is applied in a centrifugal pump to convey the liquid entering from the outside through rotation during the working process, so as to achieve the purpose of liquid conveyance.

[0026] Among them, in combination with Figures 1 to 4 , the impeller assembly 100 of the centrifugal pump of the present utility model includes an impeller 10 and a first cover body 20 covering the impeller 10. The first cover body 20 is provided with a liquid flow channel 21, and the liquid flow channel 21 penetrates through the opposite first end face 22 and second end face 22 of the first cover body 20 in the thickness direction of the first cover body 20 (as indicated by the double arrow A). Optionally, in Figures 1 to 3 , as an example, the liquid flow channel 21 is a circular channel, which is convenient for the manufacturing and processing of the liquid flow channel 21 on the first cover body 20, and also makes the gap reserved between the first part 121 described below and the liquid flow channel 21 smaller; obviously, according to actual needs, the liquid flow channel 21 can also be other shapes, as long as there is no collision interference between the first part 121 of the impeller 20 and the position of the first cover body 20 for defining the liquid flow channel 21 during the rotation process; therefore, the shape of the liquid flow channel 21 is not limited to Figures 1 to 3 shown.

[0027] At the same time, the impeller 10 faces the first end face 22 of the cover body 20; the impeller 10 includes a shaft body 11 partially extending into the liquid flow channel 21 (the state is shown in Figure 1 and Figure 4as shown) and seven vanes 12 that curve outward from the side portion 111 of the shaft body 11 and are arranged at intervals in the circumferential direction of the shaft body 11, the state is shown in Figure 6 as shown; each vane 12 is inclined relative to the axis line C of the shaft body 11, the state is shown in Figure 5 as shown; each vane 12 includes a first portion 121 and a second portion 122 that are arranged in a stepped manner together in the axial direction of the shaft body 11. The first portion 121 is located within the liquid flow channel 21, and the second portion 122 is located outside the liquid flow channel 21 and faces the first end face 22, the state is shown in Figure 4 as shown. Specifically, in Figures 1 to 2 and Figures 4 to 6 , as an example, the impeller assembly 100 for a centrifugal pump of the present invention further includes a second cover body 30. The second cover body 30 is fixedly connected to the side of the impeller 10 facing away from the first end face 22, so that the second cover body 30 and the impeller 10 are fixed together, thereby meeting the need for the second cover body 30 and the impeller 10 to rotate together during operation. It should be noted that although the drawings show that the number of vanes 12 is seven, obviously, according to actual needs, the number of vanes 12 can also be five, six, eight, etc., so it is not limited to what is shown in the drawings. More specifically, as follows:

[0028] Such as Figure 1 , Figure 2 , Figure 4 and Figure 5 , as an example, the second cover body 30 and the impeller 10 are formed into an integral structure by powder metallurgy injection molding. Optionally, as an example, the second cover body 30, the second portion 122, and the shaft body 11 form an integral structure; such a design makes the impeller assembly 100 for a centrifugal pump of the present invention have good consistency and dynamic balance. On the one hand, it makes the volume of the impeller assembly 100 for a centrifugal pump of the present invention smaller, and on the other hand, it makes the impeller assembly 100 for a centrifugal pump of the present invention have less vibration and less noise, so it can be applied to high-speed occasions. In addition, in Figure 4 , as an example, the second cover body 30 is perpendicular to the axis line C of the shaft body 11. Optionally, the second cover body 30 is disc-shaped. Such a design effectively reduces the radial runout during the rotation of the impeller 10 and the second cover body 30 together around the axis line C, and further improves the balance effect of the impeller assembly 100 for a centrifugal pump of the present invention. In addition, in Figures 1 to 6 , as an example, the shaft body 11 is provided with a mounting hole 112 to facilitate the assembly of the rotating shaft in the centrifugal pump with the impeller 20; optionally, in Figures 1 to 3 and Figures 5 to 6 , as an example, the mounting hole 112 is a square hole with arcs on opposite sides. Such a design effectively prevents relative rotation between the rotating shaft of the centrifugal pump and the impeller 20.

[0029] As shown in Figure 1 , Figure 2 and Figure 4 , as an example, the first cover 20 includes an axial ring body 20a and a radial ring body 20b that radially protrudes from and is connected to the axial ring body 20a. The internal space of the radial ring body 20b forms a liquid flow channel 21. The end face of the radial ring body 20b facing the second part 122 forms a first end face 22, and the end face of the axial ring body 20a away from the radial ring body 20b forms a second end face 23. Such a design can reduce the space occupied by the first cover 20 and reduce the material usage. Specifically, as shown in Figure 1 , Figure 2 and Figure 4 , the axial ring body 20a and the radial ring body 20b are coaxially arranged, and the axial ring body 20a and the radial ring body 20b are formed into an integral structure by stamping. Optionally, as an example, the radial ring body 20b is circular. Such a design can further simplify the manufacturing process of the first cover 20.

[0030] As shown in Figure 6 , as an example, the inclination of the first part 121 relative to the shaft body 11 is greater than the inclination of the second part 122 relative to the shaft body 11, so as to further improve the effect of the liquid entering the liquid flow channel 21 acting on the first part 121, thereby creating good conditions for increasing the rotational speed of the impeller assembly 100 for a centrifugal pump of the present invention.

[0031] Compared with the prior art, by means of the design that "each blade 12 includes a first part 121 and a second part 122 that are arranged in a stepped manner axially on the shaft body 11. The first part 121 is located in the liquid flow channel 21, and the second part 122 is located outside the liquid flow channel 21 and faces the first end face 22", the liquid entering the liquid flow channel 21 from the outside directly acts on the first part 121 of the blade 12, effectively preventing the liquid entering the liquid flow channel 21 from hitting the second cover 30 and being reflected, resulting in energy waste. Thus, the impeller assembly 100 for a centrifugal pump of the present invention can reduce energy consumption.

[0032] The above-disclosed are only the preferred examples of the present invention and cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention all fall within the scope covered by the present invention.

Claims

1. An impeller assembly for a centrifugal pump, comprising an impeller and a first cover body covering the impeller. The first cover body is provided with a liquid flow channel, and the liquid flow channel penetrates through the opposite first end face and second end face of the first cover body in the thickness direction of the first cover body. The impeller faces the first end face, and is characterized in that, The impeller includes a shaft body partially extending into the liquid flow channel and a plurality of blades that curve outward from the side of the shaft body and are arranged at intervals in the circumferential direction of the shaft body. Each blade is inclined relative to the axis line of the shaft body. Each blade includes a first part and a second part that are arranged in a stepped manner axially of the shaft body. The first part is located within the liquid flow channel, and the second part is located outside the liquid flow channel and faces the first end face.

2. The impeller assembly for a centrifugal pump according to claim 1, characterized in that, The inclination of the first part relative to the shaft body is greater than the inclination of the second part relative to the shaft body.

3. The impeller assembly for a centrifugal pump according to claim 1, characterized in that, It further includes a second cover body, which is fixedly connected to the side of the impeller facing away from the first end face.

4. The impeller assembly for a centrifugal pump according to claim 3, characterized in that, The second cover body and the impeller form an integral structure through powder metallurgy injection molding.

5. The impeller assembly for a centrifugal pump according to claim 4, wherein, The second cover body is perpendicular to the axis line of the shaft body, and the second cover body, the second part, and the shaft body form an integral structure.

6. The impeller assembly for a centrifugal pump according to claim 3, characterized in that, The second cover body is disc-shaped.

7. The impeller assembly for a centrifugal pump according to claim 1, characterized in that, The first cover body includes an axial ring body and a radial ring body that radially protrudes from the axial ring body and is connected to the axial ring body. The internal space of the radial ring body forms the liquid flow channel. The end face of the radial ring body facing the second part forms the first end face, and the end face of the axial ring body away from the radial ring body forms the second end face.

8. The impeller assembly for a centrifugal pump according to claim 7, characterized in that, The axial ring body and the radial ring body are coaxially arranged, and the radial ring body is circular.

9. The impeller assembly for a centrifugal pump according to claim 7, characterized in that, The axial ring body and the radial ring body form an integral structure through stamping.

10. The impeller assembly for a centrifugal pump according to claim 1, characterized in that, The shaft body is provided with a mounting hole; the mounting hole is a square hole with arcs on opposite sides.

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