Centrifugal pump with improved rotor assembly structure

Abstract

The centrifugal pump with improved rotor assembly structure comprises a pump body, a stator assembly, a pump cover, a rotating shaft and a rotor assembly, wherein the rotor assembly comprises a magnet, a bearing, a connecting part and an impeller cover, the connecting part comprises a wheel disc part and a connecting part, the wheel disc part comprises an impeller disc and a plurality of axial through holes arranged on the impeller disc, the connecting part comprises a first connecting part connecting the bearing and the magnet and a tubular second connecting part connecting the first connecting part and the impeller disc, and the tubular wall of the second connecting part is provided with a radial through hole. Through the above design, the centrifugal pump can reduce the accumulation of foreign matters in the space between the impeller disc and the first connecting part and the space surrounded by the inner wall surface of the second connecting part, reduce the damage caused by the impact of foreign matters on the impeller disc or the rotating shaft, and prolong the service life of the centrifugal pump.

Description

Technical Field

[0001] This utility model relates to a rotor assembly, and more particularly to a centrifugal pump using the rotor assembly, with IPC classification number F04D 13 / 06 (2006.01). Background Technology

[0002] To facilitate heat dissipation from the rotor assembly, existing centrifugal pumps typically mount the rotor assembly within a cavity formed by the pump body and cover, utilizing the liquid flowing into the cavity to immerse and cool the rotor assembly. However, the liquid flowing into the cavity often carries foreign objects (such as sand, metal shavings, etc.). These foreign objects easily accumulate in the radial inner bore of the rotor assembly and can collide with bearings or shafts, severely affecting the stability and lifespan of the centrifugal pump. Therefore, there is a need for improvement. Utility Model Content

[0003] To address the problems described in the background section, this utility model provides the following technical solution:

[0004] A centrifugal pump with an improved rotor assembly structure includes a pump body, a stator assembly fixed to the pump body, a pump cover on the pump body, a rotating shaft fixed to the pump body, and a rotor assembly rotatably mounted on the pump body. The rotor assembly includes a magnet, a bearing, a connecting part that fixes the magnet and the bearing together, and an impeller cover fixed to the connecting part. The connecting part includes a wheel disk portion and a connecting portion. The wheel disk portion includes an impeller disk and several axial through holes provided on the impeller disk. The connecting portion includes a first connecting portion that connects the bearing and the magnet and a tubular second connecting portion that connects the first connecting portion and the impeller disk. The tubular wall of the second connecting portion is provided with a radially penetrating radial through hole.

[0005] The centrifugal pump with the improved rotor assembly structure of this utility model can reduce the space between the impeller disk and the first connecting part and the space enclosed by the accumulation of foreign objects on the inner wall of the second connecting part by providing through axial and radial through holes on the impeller disk and the second connecting part of the rotor assembly, respectively. This reduces the possibility of damage caused by foreign objects colliding with the impeller disk or shaft, and improves the service life of the centrifugal pump.

[0006] Furthermore, the axial end face of the impeller disk facing the impeller cover is recessed to form several circumferentially distributed mounting grooves. The end face of the impeller cover facing the impeller disk is correspondingly provided with axial protrusions and blades are inserted and fixed on the mounting grooves. The number of axial through holes is the same as the number of blades and is circumferentially arranged between adjacent mounting grooves; or the axial end face of the impeller disk protrudes to form several circumferentially distributed blades. The number of axial through holes is the same as the number of blades and is circumferentially arranged between adjacent blades. The impeller cover and blades are welded and fixed.

[0007] Furthermore, in the axial projection, the centers of the axial through holes are on the same circumference, and the diameter of the circle is D1, while the inner diameter of the stator assembly is D2, thus satisfying D1≤D2.

[0008] Furthermore, there are two or more radial through holes, which are evenly distributed along the circumference.

[0009] Furthermore, in the radial projection diagram, the distance from the axis of the radial through hole to the axial upper end face of the bearing is H, and the diameter of the radial through hole is D3, which satisfies D3=H.

[0010] The more specific design and technical effects of this utility model are further explained in conjunction with the accompanying drawings in the specific embodiments. Attached Figure Description

[0011] Figure 1 This is an axial sectional view of the centrifugal pump of this utility model;

[0012] Figure 2 yes Figure 1 A magnified view of part A in the diagram;

[0013] Figure 3 This is an axial sectional view of the first embodiment of the rotor assembly of this utility model;

[0014] Figure 4 This is an axial sectional view of the second embodiment of the rotor assembly of this utility model;

[0015] Figure 5 This is an exploded structural diagram of the impeller cover of the rotor assembly of this utility model;

[0016] Figure 6 This is a top view of the rotor assembly of this utility model before the impeller cover is assembled.

[0017] in:

[0018] 100-Pump body, 200-Stator assembly, 300-Pump cover, 400-Shaft, 500-Rotor assembly, 510-Magnet, 520-Bearing, 530-Connecting part, 531-Connecting section, 532-Impeller disk, 533-Axial through hole, 535-Connecting section, 536-First connecting section, 537-Second connecting section, 538-Radial through hole, 539-Plastic seal, 540-Impeller cover, 541-Blade, 550-Iron core Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] See Figure 1 This utility model discloses a centrifugal pump with an improved rotor assembly structure, including a pump body 100, a stator assembly 200 fixed on the pump body 100, a pump cover 300 covering the pump body 100, a rotating shaft 400 fixed on the pump body 100, and a rotor assembly 500 rotatably mounted on the pump body 100. The main improvement of this utility model is the optimization of the rotor assembly 500. The structures of the pump body 100, stator assembly 200, pump cover 300, and rotating shaft 400 are the same as existing structures, and will not be described in detail here.

[0021] See Figure 2 and Figure 3 The rotor assembly 500 of this utility model includes a magnet 510, a bearing 520, a connecting portion 530 that fixes the magnet 510 and the bearing 520 together, and an impeller cover 540 fixed to the connecting portion 530. The connecting portion 530 includes an annular disk portion 531 and a connecting portion 535. The disk portion 531 includes an impeller disk 532 and several axial through holes 533 disposed on the impeller disk 532. The connecting portion 535 includes a first connecting portion 536 connecting the bearing 520 and the magnet 510 and a tubular second connecting portion 537 connecting the first connecting portion 536 and the impeller disk 532. The tubular arm of the second connecting portion 537 is provided with a radially penetrating radial through hole 538. Of course, other embodiments are also possible. Figure 4 The rotor assembly 500 also includes an iron core 550 and a plastic shell 539. When manufacturing the rotor assembly 500, the iron core 550 and the magnet 510 are used as mold inserts to form a plastic shell 539 that wraps the radial outer surface of the iron core 550 or the magnet 510. Then, the part formed by the first injection molding and the bearing 520 are used as mold inserts to form a connecting part 530 that fixes the part formed by the first injection molding and the bearing 520.

[0022] See 1 and Figure 2In this centrifugal pump, the space between the impeller disk 532 facing the magnet 510, the radial outer surface of the second connecting portion 537, and the surface of the first connecting portion 536 facing the impeller disk 532 forms a first flow region S1. The axial space between the impeller cover 540 and the impeller disk 532 forms a second flow region S2. The space on the inner wall of the second connecting portion 537 forms a third flow region S3. When the centrifugal pump is working, the rotor assembly 400 pushes the liquid radially outward. During the hydraulic outward discharge process, the liquid enters the first flow region S1. A portion of the liquid entering the first flow region S1 pushes foreign objects located in the first flow region S1 through the axial through hole 533 to move towards the second flow region S2. Another portion of the liquid entering the first flow region S1 passes through the radial through hole 538 into the third flow region S3 and pushes foreign objects located in the third flow region S3 towards the second flow region S2. Finally, the foreign objects are discharged outward under the push of the blades 541 in the second flow region S2. The centrifugal pump of this invention can reduce the accumulation of foreign objects in the first flow region S1 and the third flow region S3, reduce the impact of foreign objects on the impeller disk 532 or the shaft 400 in the above-mentioned regions and thus reduce damage, thereby improving the service life of the centrifugal pump.

[0023] See Figure 3 and Figure 5 To enhance the connection strength between the impeller disk 532 and the impeller cover 540, the rotor assembly 500 of this invention features a rotor disk 532 with its axial end face facing the impeller cover 540 recessed to form several circumferentially distributed mounting grooves 534. The impeller cover 540 has corresponding axially protruding blades 541 that fit into the mounting grooves 534. After the impeller cover 540 is fixed to the impeller disk 532, its blades 541 extend into the mounting grooves 534. Furthermore, the number of axial through holes 533 is the same as the number of blades 541 and they are arranged between circumferentially adjacent mounting grooves 534. Alternatively, in other embodiments, the axial end face of the impeller disk protrudes to form several circumferentially distributed blades, the number of axial through holes is the same as the number of blades and they are arranged circumferentially between adjacent blades, and the impeller cover is welded to the blades.

[0024] See Figure 4To reduce the problem of uneven radial force on the rotor assembly 400 due to the addition of radial through holes 538, which could cause wobbling during rotation, the rotor assembly 500 of this invention has two or more radial through holes 538, evenly distributed circumferentially. Preferably, in this embodiment, the number of radial through holes 538 is two. Further, in the radial projection diagram of the centrifugal pump, the distance from the axis of the radial through hole 538 to the axial upper end face of the bearing 520 is H, and the diameter of the radial through hole 538 is D3, satisfying D3 = H. This design ensures the strength of the second connecting part 537 while facilitating the passage of liquid through the radial through hole 538 and pushing upwards to discharge foreign objects located above the bearing 520.

[0025] See Figure 6 In the axial projection of the centrifugal pump, the center of the axial through hole 533 lies on the same circumference. Further, see... Figure 1 , Figure 2 and Figure 6 In this invention, the diameter of the circle containing the axial through hole 533 of the rotor assembly 500 is D1, and the inner diameter of the stator assembly 200 is D2, thus satisfying D1≤D2. This design reduces the resistance of the pump body 100 to the liquid flowing into the axial region of the impeller disk 532 and bearing 520, allowing the liquid to enter the aforementioned region more smoothly and propelling foreign objects out, reducing the accumulation of foreign objects in the region and their impact with the impeller disk, and reducing vibration during centrifugal pump operation.

Claims

1. A centrifugal pump with an improved rotor assembly structure, comprising a pump body (100), a stator assembly (200) fixed to the pump body (100), a pump cover (300) covering the pump body (100), a rotating shaft (400) fixed to the pump body (100), and a rotor assembly (500) rotatably mounted on the pump body (100), wherein the rotor assembly (500) includes a magnet (510), a bearing (520), a connecting part (530) for fixing the magnet and the bearing, and an impeller cover (540) fixed to the connecting part (530), characterized in that: The connecting part (530) includes a wheel disk part (531) and a connecting part (535). The wheel disk part (531) includes an impeller disk (532) and several axial through holes (533) provided on the impeller disk (532). The connecting part (535) includes a first connecting part (536) connecting the bearing (520) and the magnet (510) and a tubular second connecting part (537) connecting the first connecting part (536) and the impeller disk (532). The tubular wall of the second connecting part (537) is provided with a radially penetrating radial through hole (538).

2. The centrifugal pump of claim 1, wherein: The impeller disk (532) has a recessed axial end face facing the impeller cover (540) to form several circumferentially distributed mounting grooves (534). The end face of the impeller cover (540) facing the impeller disk (542) has an axial protrusion and blades (541) inserted and fixed in the mounting grooves (534). The number of axial through holes (533) is the same as the number of blades (541) and they are circumferentially arranged between adjacent mounting grooves (534). Alternatively, the axial end face of the impeller disk has a protrusion to form several circumferentially distributed blades. The number of axial through holes is the same as the number of blades and they are circumferentially arranged between adjacent blades. The impeller cover is welded and fixed to the blades.

3. The centrifugal pump of claim 1 or 2, wherein: In the axial projection, the centers of the axial through holes (533) are on the same circumference, and the diameter of the circle is D1. The inner diameter of the stator assembly (200) is D2, which satisfies D1≤D2.

4. The centrifugal pump with the improved rotor assembly structure according to claim 1 or 2, characterized in that: The number of radial through holes (538) is more than two, and they are evenly distributed along the circumference.

5. The centrifugal pump of claim 4, wherein: In the radial projection diagram, the distance from the axis of the radial through hole (538) to the axial upper end face of the bearing (520) is H, and the diameter of the radial through hole (538) is D3, which satisfies D3=H.

Images