CN216216137U

CN216216137U - Rotor with built-in bearing and centrifugal pump

Info

Publication number: CN216216137U
Application number: CN202122612346.5U
Authority: CN
Inventors: 何沃权
Original assignee: Jiangmen Tiandi Electrical Appliance Co ltd
Current assignee: Jiangmen Tiandi Electrical Appliance Co ltd
Priority date: 2021-10-28
Filing date: 2021-10-28
Publication date: 2022-04-05
Anticipated expiration: 2031-10-28

Abstract

The utility model provides a rotor with a built-in bearing, which comprises a magnetic ring, a bearing and a plastic package body and is characterized in that the bearing is provided with a bearing central hole for a rotating shaft to pass through, and the peripheral surface of the bearing is provided with a bulge; the plastic package body is fixedly connected between the bearing and the magnetic ring through injection molding, an accommodating groove is formed in the outer side face of the plastic package body, and the magnetic ring is bonded and fixed in the accommodating groove; the plastic package body wraps the outer peripheral surface of the bearing, and an assembly hole for the rotating shaft to pass through is reserved. The bearing and the plastic package body are combined into a whole in an injection molding mode, so that errors caused by manual installation of the bearing are avoided, the bearing coaxiality is good, and the rotor rotation is more stable. The contact area between the bearing and the plastic package body is increased by the bulge on the outer peripheral surface of the bearing, so that the bearing and the plastic package body are fixedly connected more firmly.

Description

Rotor with built-in bearing and centrifugal pump

Technical Field

The utility model relates to the technical field of motor rotors, in particular to a rotor with a built-in bearing and a centrifugal pump, and IPC (International Process control) classification belongs to F04D 29/18.

Background

Existing centrifugal pumps typically provide a bearing between the rotor body and the shaft so that the rotor body can rotate relative to the shaft. When the bearing is used as an independent part, the production process of the rotor needs to consume manpower to install the bearing, and the bearing is not easy to process; and the structural size of the bearing and the tolerance of the installation position can cause the eccentric error of the bearing, and the coaxiality is difficult to ensure. When the centrifugal pump made of the rotor works, the abrasion between the bearing and the rotating shaft is large, and the maintenance cost is high. Therefore, there is a need for an improved solution.

With regard to terms and knowledge, in addition to the specification, see "IEC electrical and electronic standard term dictionary" (1 st edition of Chinese Standard Press 1992), "Electrical apparatus manufacturing technology" (1 st edition of mechanical industry Press 1982), "mechanical engineering Manual" and "Motor engineering Manual" (1 st edition of mechanical industry Press 1978 and 2 nd edition of 1997), and national standard GB/T6930 & 2002 & ltRolling bearing & gt & lt glossary & gt & lt, GB/T7021 & lt, 2019 & lt, centrifugal pump noun & gt & lt.

Disclosure of Invention

The utility model mainly aims to provide a rotor with a built-in bearing and a centrifugal pump, and aims to solve the problems that in the prior art, the rotor bearing is not easy to process, the coaxiality is difficult to ensure and is easy to damage.

On one hand, the utility model provides a rotor with a built-in bearing, which comprises a magnetic ring, a bearing and a plastic package body and is characterized in that the bearing is provided with a bearing central hole for a rotating shaft to pass through, and the peripheral surface of the bearing is provided with a bulge; the plastic package body is fixedly connected between the bearing and the magnetic ring through injection molding, a containing groove used for limiting the position of the magnetic ring is formed in the outer side face of the plastic package body, and the plastic package body wraps the outer peripheral face of the bearing and leaves an assembling hole for the rotating shaft to penetrate through.

Specifically, the protrusions are ribs distributed on the outer peripheral surface of the bearing in a staggered manner.

Specifically, an impeller is formed at one end of the plastic package body.

In another aspect, the present invention provides a centrifugal pump, comprising a stator and the rotor with the built-in bearing, wherein the stator is fixedly provided with the rotating shaft.

The utility model has the following beneficial effects:

firstly, the bearing and the plastic package body are combined into a whole in an injection molding mode, so that errors caused by manual installation of the bearing are avoided, the bearing coaxiality is good, and the rotor rotation is more stable.

And secondly, the outer peripheral surface of the bearing is provided with a bulge, so that the contact area between the bearing and the plastic package body is increased, and the bearing and the plastic package body are fixedly connected more firmly.

Thirdly, the convex ribs are distributed in an staggered mode in the axial direction and the circumferential direction, the contact area between the bearing and the plastic package body is increased, the combination between the bearing and the plastic package body is more stable, and the bearing is not easy to loosen in the rotation of the rotor.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the utility model.

Drawings

FIG. 1 is a cross-sectional view of a rotor of the inner bearing according to an embodiment of the present invention;

FIG. 2 is a perspective view of the bearing in an embodiment of the present invention;

fig. 3 is a sectional view of the centrifugal pump in the embodiment of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments.

As shown in fig. 1, the present invention provides a bearing-embedded rotor, which includes a magnetic ring 11, a bearing 13 and a plastic package 14. The molded body 14 is a plastic housing that is injection molded in a mold with the bearing 13 as an insert.

As shown in fig. 2, the bearing 13 is formed by plastic injection molding, and has a cylindrical shape, the center of the bearing has a bearing center hole 131 for the rotating shaft 12 to pass through, and the outer peripheral surface of the bearing 13 is provided with a protrusion 132, so that the contact area between the bearing 13 and the plastic package body 14 is increased, and the fixed connection between the two is firmer.

Specifically, the protrusions 132 are ribs extending axially and circumferentially on the outer peripheral surface of the bearing 13 and arranged in a staggered manner. The convex ribs are distributed in a staggered mode in the axial direction and the circumferential direction, so that the contact area between the bearing 13 and the plastic package body 14 is increased, the combination between the bearing 13 and the plastic package body 14 is firmer, and the rotor 10 is not easy to loosen in the rotation process.

The magnet ring 11 and the bearing 13 which is previously injection molded are placed in a mold for injection molding to form a plastic package 14. The plastic package body 14 is fixedly connected between the bearing 13 and the magnetic ring 11 through injection molding, the bearing 13 and the magnetic ring 11 are combined into a whole through the injection molding of the plastic package body 14, errors caused by manual installation of the bearing 13 are avoided, the coaxiality of the bearing 13 is good, and the rotor 10 rotates more stably. The magnet ring 11 is prepared by sintering molding or bonding molding. After the plastic package body 14 is formed, the outer side surface forms an accommodating groove 141 for limiting the position of the magnetic ring 11. The plastic package body 14 is wrapped around the outer peripheral surface of the bearing 13, leaving a fitting hole 143 for the rotating shaft 12 to pass through. The order of manufacturing the parts can also be changed, for example, the bearing 13 which is injection molded in advance is placed in a mold for injection molding to form the plastic package body 14. Then, the magnet ring 11 is formed in the accommodating groove 141, and the rotor with the built-in bearing is prepared. The rotor with the built-in bearing manufactured by the two manufacturing methods has the consistent structure.

In addition, the impeller 142 can be manufactured together with the plastic package body 14 by replacing the mold, and the impeller 142 is formed at one end of the plastic package body 14, so that the process of manually installing the impeller 142 on the rotor 10 is omitted, and the production efficiency is higher. Moreover, the impeller 142 directly molded on the plastic package body 14 has better coaxiality and higher pumping efficiency. As will be understood by those skilled in the art, the impeller 142 of the present invention can be fully open, semi-open, or closed, and for both fully open and semi-open, the impeller 142 can be integrally formed with the plastic package 14; for a closed impeller, the back cover and the blades are generally formed together when the plastic package body 14 is formed, and then the front cover of the impeller formed separately is assembled to the back cover of the impeller.

As shown in fig. 3, the present invention also provides a centrifugal pump comprising a stator 20 and a rotor 10 of the above-described built-in bearing 13. The rotating shaft 12 is fixedly disposed in the stator 20, and the centrifugal pump is completed by assembling the rotor 10 of the built-in bearing 13 into the rotating shaft 12.

While particular embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: numerous changes, modifications, substitutions and alterations can be made to the described embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A rotor with a built-in bearing comprises a magnetic ring (11), a bearing (13) and a plastic package body (14), and is characterized in that the bearing (13) is provided with a bearing center hole (131) for a rotating shaft (12) to pass through, and the outer peripheral surface of the bearing (13) is provided with a bulge (132); the plastic package body (14) is fixedly connected between the bearing (13) and the magnetic ring (11) through injection molding, an accommodating groove (141) for limiting the position of the magnetic ring (11) is formed in the outer side face of the plastic package body (14), the plastic package body (14) wraps the outer peripheral face of the bearing (13), and assembling holes (143) for the rotating shaft (12) to penetrate through are reserved at two ends of the bearing (13).

2. The rotor with built-in bearing according to claim 1, wherein the protrusions (132) are ribs arranged in a staggered manner on the outer circumferential surface of the bearing (13).

3. The internally-mounted bearing rotor as recited in claim 1, wherein an impeller (142) is formed at one end of the plastic-sealed body (14).

4. A centrifugal pump comprising a stator (20) and a rotor (10) with built-in bearing (13) according to any one of claims 1 to 3, characterized in that the stator (20) is fixedly provided with the rotating shaft (12).