CN218493863U

CN218493863U - Bearing, rotor of centrifugal water pump and rotor forming die

Info

Publication number: CN218493863U
Application number: CN202222847304.4U
Authority: CN
Inventors: 李佐
Original assignee: Dongguan Shenpeng Electronics Co ltd
Current assignee: Guangdong Shenpeng Technology Co ltd
Priority date: 2022-10-27
Filing date: 2022-10-27
Publication date: 2023-02-17
Anticipated expiration: 2032-10-27

Abstract

The utility model discloses a bearing, a rotor of a centrifugal water pump and a rotor forming die, which relate to the technical field of centrifugal water pumps and comprise a bearing inner ring and a bearing outer ring which are coaxially arranged; the inner hole of the bearing inner ring is provided with a shaft core hole for the shaft core of the centrifugal water pump to pass through, and an annular gap is formed between the bearing inner ring and the bearing outer ring. The utility model mainly solves the problem of how to provide a bearing which can bear high temperature and high pressure and is not easy to deform for a centrifugal water pump; when making centrifugal water pump's rotor, through the structure of support column support bearing inner ring to through the structure of support ring support bearing outer ring, make the bearing can bear the high temperature high pressure that comes from injection moulding process and difficult deformation, thereby improve and use the utility model discloses a centrifugal water pump's quality.

Description

Bearing, rotor of centrifugal water pump and rotor forming die

Technical Field

The utility model relates to a centrifugal water pump technical field specifically is a rotor and rotor forming die of bearing, centrifugal water pump.

Background

The water pump can drive liquid to flow, so that the liquid can flow from one place to another directionally, and the water pump is a mechanical device with wide application, wherein a centrifugal water pump is an important water pump form. The rotor is a core part of the centrifugal water pump and is used for driving the impeller to rotate, the rotating impeller drives water flow in the centrifugal water pump to rotate at a high speed, and the water flow is centrifugally thrown out and pressed into a water outlet of the centrifugal water pump.

A bearing is arranged in a rotor of the centrifugal water pump, and the bearing is used for being matched with the shaft core and providing a rotating supporting structure and a radial limiting structure for the rotor; in the prior art, the centrifugal water pump usually adopts graphite or ceramic as a base material of the bearing, which has high cost, and the bearing made of plastic can effectively reduce the cost.

However, the rotor of the centrifugal water pump is usually formed by in-mold injection, that is, when the rotor is manufactured, the bearing needs to be placed in a forming mold of the rotor, and then plastic is injected into the forming mold to directly encapsulate and form the rotor on the bearing; in the above process, the bearing needs to bear high temperature and high pressure (the temperature can reach more than 300 ℃, and the pressure can reach more than 150 MPa) from the injection molding process, and at this time, the bearing is often deformed towards the inner hole direction thereof due to the high temperature and the high pressure, so that the inner hole of the bearing is reduced, and the bearing is easily out of compliance.

In summary, how to provide a bearing which can withstand high temperature and high pressure and is not easy to deform for a centrifugal water pump is an urgent problem to be solved.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a bearing, it can cooperate with mould inner insert to bear the high temperature high pressure that comes from injection moulding process and be difficult for deformation.

Another object of the present invention is to provide a rotor of a centrifugal water pump, wherein the bearing is not easily deformed due to the high temperature and high pressure of the injection molding process.

Another object of the present invention is to provide a rotor molding mold, which can prevent the bearing from deforming during the injection molding of the rotor.

In order to achieve the above object, the utility model provides a following technical scheme: a bearing comprises a bearing inner ring and a bearing outer ring which are coaxially arranged; the inner hole of the bearing inner ring is a shaft core hole for a shaft core of the centrifugal water pump to pass through, and an annular gap is formed between the bearing inner ring and the bearing outer ring.

In the above technical solution, the bearing further includes an annular connecting portion; the bearing inner ring and the bearing outer ring are radially connected through the connecting part.

In the above technical solution, the bearing inner ring continues to extend after passing over the connecting portion along the axial direction to form a bearing head.

In the above technical scheme, a reinforcing rib is arranged between the bearing head and the connecting part.

In the above technical scheme, the connecting portion is provided with a through hole communicated to the annular gap.

In the above technical solution, a plurality of bumps are formed on the outer wall of the bearing outer ring.

The rotor of the centrifugal water pump comprises the bearing and a rotor body; the rotor body is coated and molded outside the bearing outer ring of the bearing through an in-mold injection molding process.

In the technical scheme, one end of the rotor body is provided with the impeller, and the outer wall of the rotor body is provided with the permanent magnet.

In the above technical scheme, the inner wall of the rotor body forms the clamping ribs at two ends of the bearing outer ring of the bearing respectively, so that the two ends of the bearing outer ring are clamped by the clamping ribs.

A rotor forming die is used for manufacturing the rotor of the centrifugal water pump and comprises a die cavity, a front die insert and a rear die insert; the die cavity is used for molding the rotor body, and the front die insert and the rear die insert are arranged in the die cavity; the front mold insert is provided with a cavity part along the axial direction, the peripheral edge of the cavity part is provided with a top closing edge, and the bottom of the cavity part is continuously recessed towards the axial direction of the front mold insert to form an insertion hole; the center of the rear mould insert is pulled up to form a supporting column matched with the shape of the shaft core hole of the bearing, and the periphery of the rear mould insert is pulled up to form a supporting ring matched with the shape of the annular gap of the bearing; when the rotor forming die is closed, the supporting column of the rear die insert penetrates through the shaft core hole of the bearing and is inserted into the jack of the front die insert, and the supporting ring of the rear die insert penetrates into the annular gap of the bearing.

Compared with the prior art, the beneficial effects of the utility model are that:

1. in the bearing of the utility model, an annular gap is arranged between the bearing inner ring and the bearing outer ring; when centrifugal pump's rotor shaping, increase the mold insert on its forming die to set up annular supporter on the mold insert, insert this supporter behind the annular clearance of this bearing, can pass through this supporter supporting bearing outer ring, make the utility model discloses a bearing can bear the high temperature high pressure that comes from injection moulding process and difficult deformation, thereby improves and uses the utility model discloses a centrifugal pump's quality.

2. The utility model discloses a rotor of centrifugal water pump, which has an annular gap between the bearing inner ring and the bearing outer ring of the bearing, and the rotor body is coated and molded outside the bearing outer ring of the bearing through the in-mold injection molding process; the utility model discloses a centrifugal pump's rotor increases the mold insert on its forming die to set up annular support on the mold insert, insert the annular clearance back of bearing with this support, can pass through this support supporting bearing outer loop, make the bearing can bear the high temperature high pressure that comes from injection molding process and be difficult for deformation, thereby improve and use the utility model discloses a centrifugal pump's quality.

3. The utility model discloses a rotor forming die, when making centrifugal water pump's rotor, through the structure of support column support bearing inner ring to through the structure of support ring support bearing outer ring, make the bearing can bear the high temperature high pressure that comes from injection molding process and be difficult for deformation, thereby improve and use the utility model discloses a centrifugal water pump's quality.

Drawings

Fig. 1 is a perspective view of a first embodiment of the present invention.

Fig. 2 is a cross-sectional view of a first embodiment of the present invention.

Fig. 3 is a perspective view of a second embodiment of the present invention.

Fig. 4 is a cross-sectional view of a second embodiment of the present invention.

Fig. 5 is a cross-sectional view of a third embodiment of the present invention.

The reference signs are: 1. a bearing; 11. a bearing inner ring; 12. a spindle bore; 13. a bearing outer ring; 14. an annular gap; 15. a connecting portion; 16. a bump; 17. reinforcing ribs; 18. a through hole; 19. a bearing head; 2. a rotor of a centrifugal water pump; 21. a rotor body; 22. an impeller; 23. a permanent magnet; 24. an evacuation portion; 25. a snap-fit rib; 3. a rotor forming die; 31. a mold cavity; 32. a front mold insert; 321. a cavity portion; 322. a jack; 323. jacking and combining edges; 33. a rear mold insert; 331. a support pillar; 332. and (4) a support ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

The first embodiment is as follows:

this embodiment provides a bearing, and it can use in centrifugal water pump's rotor to with centrifugal water pump's axle core cooperation, provide rotation bearing structure and radial limit structure for centrifugal water pump's rotor.

Referring to fig. 1 and fig. 2, the bearing of the present embodiment is an integrally injection molded workpiece, and includes a bearing inner ring 11 and a bearing outer ring 13 which are coaxially disposed; the inner hole of the bearing inner ring 11 is provided with a shaft core hole 12 for the shaft core of the centrifugal water pump to pass through, namely, the shaft core hole 12 is a cylindrical hole and can be used for the shaft core to pass through, so that the bearing 1 can rotate around the shaft core; an annular gap 14 is formed between the bearing inner ring 11 and the bearing outer ring 13, that is, a certain gap into which an object can enter is formed between the outer wall of the bearing inner ring 11 and the inner wall of the bearing outer ring 13, and the gap is the annular gap 14.

Specifically, the bearing of the present embodiment further includes an annular connecting portion 15, and the bearing inner ring 11 and the bearing outer ring 13 are radially connected by the connecting portion 15; specifically, the connecting portion 15, the bearing inner ring 11 and the bearing outer ring 13 are integrally injection molded, the inner ring of the connecting portion 15 is connected to the outer wall of the bearing inner ring 11, and the outer ring of the connecting portion 15 is connected to the inner wall of the bearing outer ring 13, thereby forming the complete bearing 1.

Further, the bearing inner ring 11 continues to extend after passing through the connecting portion 15 along the axial direction, forming a bearing head 19; the bearing head 19 is not contacted with the inner wall of the rotor of the centrifugal water pump, so that a clearance 24 is formed between the bearing head 19 and the rotor of the centrifugal water pump to avoid over-pressing the bearing inner ring 11 and the shaft core hole 12 therein.

Furthermore, a reinforcing rib 17 is arranged between the bearing head 19 and the connecting part 15; in this embodiment, the reinforcing rib 17 is a rib plate in the shape of a right triangle, one of the right-angle sides of the reinforcing rib 17 is connected with the bearing head 19, and the other right-angle side of the reinforcing rib 17 is connected with the connecting part 15; in this embodiment, four reinforcing ribs 17 are provided, and the axis of the bearing 1 is taken as the center of symmetry; the reinforcing ribs 17 are provided, and the strength of the bearing head 19 can be effectively improved.

Furthermore, the connecting part 15 is provided with a through hole 18 communicated to the annular gap 14; in this embodiment, the through holes 18 are kidney-shaped holes, and four through holes 18 are arranged, and the axis of the bearing 1 is taken as a symmetry center; the through holes 18 are arranged, so that water flow can enter and exit the annular gap 14 of the bearing 1 during the operation process of the centrifugal water pump, and the heat of the bearing 1 is dissipated; in addition, when the water pump works, the pressure difference exists at the upper end and the lower end of the bearing 1, if no drainage hole is arranged, the pressure difference forces fluid to flow through the gap between the bearing 1 and the shaft core, the bearing 1 and the shaft core are extremely easy to block under the condition that foreign matters exist in the fluid, and after the through hole 18 is additionally arranged on the bearing 1 to serve as the drainage hole, the fluid flows through the through hole 18 and does not pass through the gap between the bearing 1 and the shaft core, so that the problem that the bearing 1 and the shaft core are blocked is effectively avoided.

Furthermore, a plurality of projections 16 are formed on the outer wall of the bearing outer ring 13, and after the rotor of the centrifugal water pump is molded, the projections 16 can be embedded into the inner wall of the rotor of the centrifugal water pump, so that the tightness of the combination of the bearing 1 and the rotor of the centrifugal water pump is improved.

In the bearing of the present embodiment, an annular gap 14 is formed between the bearing inner ring 11 and the bearing outer ring 13; when centrifugal water pump's rotor shaping, increase the mold insert on its forming die to set up annular supporter on the mold insert, insert this supporter behind this bearing 1's annular clearance 14, can support bearing outer ring 13 through this supporter, make the bearing 1 of this embodiment can bear the high temperature high pressure that comes from injection molding process and be difficult for deformation, thereby improve and use the utility model discloses a centrifugal water pump's quality.

Example two:

the present embodiment provides a rotor of a centrifugal water pump, which can be applied in a centrifugal water pump to drive water flow to do centrifugal motion.

Referring to fig. 3 and 4, the rotor of the centrifugal water pump of the present embodiment includes the bearing 1 of the first embodiment, and further includes a rotor body 21, where the rotor body 21 is an integrally injection-molded workpiece; the rotor body 21 is coated and molded outside the bearing outer ring 13 of the bearing 1 by an in-mold injection molding process, that is, the bearing 1 is placed into a molding die of the rotor body 21, and then plastic is injected into the molding die to directly encapsulate and mold the rotor body 21 on the bearing 1.

Specifically, one end of the rotor body 21 is provided with an impeller 22, the impeller 22 is provided with a plurality of blades for driving water flow to do centrifugal motion, and the impeller 22 and the rotor body 21 are integrally formed by injection molding; and a permanent magnet 23 is disposed on an outer wall of the rotor body 21, and the permanent magnet 23 is used for magnetic coupling with a stator assembly of the centrifugal water pump to drive the rotor body 21 and the impeller 22 to rotate.

Further, the inner wall of the rotor body 21 is formed with engaging ribs 25 at both ends of the bearing outer ring 13 of the bearing 1, respectively, so as to engage both ends of the bearing outer ring 13 by the engaging ribs 25, specifically, the engaging ribs 25 are annular ribs provided on the inner wall of the rotor body 21, and are integrally injection-molded with the rotor body 21.

In the rotor of the centrifugal water pump of the embodiment, an annular gap 14 is formed between the bearing inner ring 11 and the bearing outer ring 13 of the bearing 1, and the rotor body 21 is coated and molded outside the bearing outer ring 13 of the bearing 1 through an in-mold injection molding process; at centrifugal pump's of this embodiment rotor 2, increase the mold insert on its forming die to set up annular supporter on the mold insert, insert this supporter behind bearing 1's annular clearance 14, can support bearing outer ring 13 through this supporter, make bearing 1 can bear the high temperature high pressure that comes from injection molding process and be difficult for deformation, thereby improve and use the utility model discloses a centrifugal pump's quality.

Example three:

the present embodiment provides a rotor forming mold 3 for manufacturing the rotor 2 of the centrifugal water pump described in the second embodiment.

Referring to fig. 5, the rotor forming mold 3 of the present embodiment includes a mold cavity 31, a front mold insert 32, and a rear mold insert 33; the mold cavity 31 is formed by combining cavities of a front mold and a rear mold, the mold cavity 31 is used for molding the rotor body 21, and specifically, the mold cavity 31 is used for molding the rotor body 21 and the impeller 22 thereon; the front mold insert 32 and the rear mold insert 33 are both cylindrical, and the front mold insert 32 and the rear mold insert 33 are both disposed in the cavity 31. In practice, the front mold insert 32 and the rear mold insert 33 may be independent inserts and fixed in the cavity 31, and the front mold insert 32 and the rear mold insert 33 may also be structural parts in the cavity 31.

The front mold insert 32 is provided with a cavity part 321 along the axial direction, the cavity part 321 is cylindrical, the outer periphery of the cavity part 321 is provided with a top closing edge 323, the top closing edge 323 is a thin-walled circular ring, the bottom of the cavity part 321 is continuously recessed towards the axial direction of the front mold insert 32 to form a jack 322, and the jack 322 is cylindrical; the center of the rear mold insert 33 is pulled up to form a support column 331 having a shape matching the axial bore 12 of the bearing 1, i.e., the support column 331 is cylindrical and can be tightly fitted into the axial bore 12 of the bearing 1, and the outer periphery of the rear mold insert 33 is pulled up to form a support ring 332 having a shape matching the annular gap 14 of the bearing 1, i.e., the support ring 332 is circular and can be tightly fitted into the annular gap 14 of the bearing 1.

When the rotor forming mold 3 is closed, the supporting column 331 of the rear mold insert 33 passes through the core hole 12 of the bearing 1 and is inserted into the insertion hole 322 of the front mold insert 32 to support the structure of the bearing inner ring 11 by the supporting column 331, and the supporting ring 332 of the rear mold insert 33 passes into the annular gap 14 of the bearing 1 to support the structure of the bearing outer ring 13 by the supporting ring 332.

The rotor forming mold 3 of the embodiment is used for manufacturing the rotor 2 of the centrifugal water pump of the second embodiment in cooperation with the bearing 1 of the first embodiment, firstly, a shaft core hole 12 of the bearing 1 is sleeved into a supporting column 331 of a rear mold insert 33, a supporting ring 332 of the rear mold insert 33 is inserted into an annular gap 14 of the bearing 1, then, the mold is closed, the supporting column 331 of the rear mold insert 33 is inserted into a jack 322 of a front mold insert 32, a butting edge 323 of the front mold insert 32 is abutted against a bearing outer ring 13 of the bearing 1, a cavity portion 321 of the front mold insert 32 covers a bearing head 19 of the bearing 1, a clearance avoiding portion 24 is formed between the bearing head 19 and the formed rotor 2 of the centrifugal water pump, and the bearing inner ring 11 and the shaft core hole 12 therein are prevented from being excessively pressed; injecting liquid plastic into the rotor forming mold 3, coating and forming the rotor body 21 outside the bearing outer ring 13 of the bearing 1 through the mold cavity 31, and forming the impeller 22, wherein in the process, the structure of the bearing inner ring 11 is supported by the support column 331, and the structure of the bearing outer ring 13 is supported by the support ring 332, so that the bearing 1 can bear high temperature and high pressure from an injection molding process and is not easy to deform; the molded rotor body 21 is formed with clamping ribs 25 at two ends of the bearing outer ring 13 of the bearing 1 respectively, so that the clamping ribs 25 clamp two ends of the bearing outer ring 13, and the bearing 1 and the rotor body 21 are not easy to be axially dislocated; the projection 16 on the bearing 1 can be embedded into the inner wall of the rotor body 21, so that the bearing 1 and the rotor body 21 are not easy to be dislocated in the radial direction.

Rotor forming die 3 of this embodiment, when making centrifugal water pump's rotor 2, through the structure of support column 331 support bearing inner ring 11 to through the structure of support ring 332 support bearing outer ring 13, make bearing 1 can bear the high temperature high pressure that comes from injection moulding process and difficult deformation, thereby improve and use the utility model discloses a centrifugal water pump's quality.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A bearing is characterized by comprising a bearing inner ring and a bearing outer ring which are coaxially arranged;

the inner hole of the bearing inner ring is provided with a shaft core hole for the shaft core of the centrifugal water pump to pass through, and an annular gap is formed between the bearing inner ring and the bearing outer ring.

2. The bearing of claim 1, wherein: the connecting part also comprises an annular connecting part; the bearing inner ring and the bearing outer ring are radially connected through the connecting part.

3. The bearing of claim 2, wherein: the bearing inner ring continuously extends after passing through the connecting part along the axial direction to form a bearing head.

4. The bearing of claim 3, wherein: and reinforcing ribs are arranged between the bearing head and the connecting part.

5. The bearing of claim 2, wherein: the connecting part is provided with a through hole communicated to the annular gap.

6. The bearing of claim 1, wherein: and a plurality of lugs are formed on the outer wall of the bearing outer ring.

7. A rotor for a centrifugal water pump, comprising a bearing according to any one of claims 1 to 6, further comprising a rotor body;

the rotor body is coated and molded outside the bearing outer ring of the bearing through an in-mold injection molding process.

8. The rotor of a centrifugal water pump according to claim 7, wherein: an impeller is arranged at one end of the rotor body, and a permanent magnet is arranged on the outer wall of the rotor body.

9. The rotor of a centrifugal water pump according to claim 7, wherein: the inner wall of the rotor body forms clamping ribs at two ends of the bearing outer ring of the bearing respectively so as to clamp two ends of the bearing outer ring through the clamping ribs.

10. A rotor forming mold for manufacturing a rotor of a centrifugal water pump according to any one of claims 7 to 9, comprising a cavity, a front mold insert, and a rear mold insert;

the die cavity is used for molding the rotor body, and the front die insert and the rear die insert are both arranged in the die cavity;

the front mold insert is provided with a cavity part along the axial direction, the peripheral edge of the cavity part is provided with a top closing edge, and the bottom of the cavity part is continuously recessed towards the axial direction of the front mold insert to form an insertion hole;

the center of the rear mold insert is pulled up to form a supporting column matched with the shape of a shaft core hole of the bearing, and the periphery of the rear mold insert is pulled up to form a supporting ring matched with the shape of an annular gap of the bearing;

when the rotor forming mold is closed, the supporting column of the rear mold insert penetrates through the shaft core hole of the bearing and is inserted into the jack of the front mold insert, and the supporting ring of the rear mold insert penetrates into the annular gap of the bearing.