CN219999111U - Novel direct-current package injection stator with aluminum inserts - Google Patents

Abstract

The utility model relates to a novel direct current injection stator with an aluminum insert, which is mainly characterized in that the aluminum insert is inserted into the center of a stator core in an integrated manner and comprises a motor connecting part and a bearing connecting part. The bearing mounting hole is positioned at the bearing connecting part and can be embedded with a bearing; the motor shaft hole is positioned at the motor connecting part, concentric with the bearing mounting hole and with an inner diameter smaller than the bearing mounting hole. The whole stator core and the aluminum insert are wrapped and fixed by plastic. The aluminum insert is also provided with a spline part which is connected with the bearing part and is provided with a through hole with the same diameter as the motor shaft hole. In addition, the use of polyamide plastics enhances thermal stability and electrical properties, while the elastomeric gasket provides additional sealing properties to reduce vibration. In general, the structure is simple in design, convenient to assemble, stable in operation and excellent in electrical performance.

Description

Novel direct-current package injection stator with aluminum inserts

Technical Field

The utility model relates to the field of centrifugal fan tools, in particular to a novel rotating shaft pressing tool for a centrifugal fan.

Background

When assembling the direct current package and penetrate the stator, need install aluminium inserts generally, aluminium inserts installs and mainly plays following effect on the direct current package penetrates the stator:

and (3) heat dissipation: the aluminum insert has good heat conduction properties. When the direct-current injection stator generates heat in the operation process, the aluminum insert can help to rapidly lead out the heat, and the heat dissipation effect is improved. This helps to keep the temperature of the dc injection stator within a suitable range and avoid degradation or damage to the motor due to overheating.

Support and fixation: the aluminum inserts may serve as a support structure for the stator, providing additional support and stability. This helps to ensure that the stator remains stable during operation, reducing losses due to vibrations and the like.

Structural strength: the aluminum insert can enhance the structural strength of the direct current injection stator. The aluminum material has higher strength and rigidity, and the deformation resistance and compression resistance of the integral structure can be improved by installing the aluminum material on the direct current injection stator.

Electrical insulation: the aluminum insert may provide some degree of electrical insulation. Although aluminum itself is a conductive material, electrical insulation may be achieved by coating the aluminum insert surface with an insulating material or by using a special treatment method. This helps to prevent faults such as electrical short circuits or leakage and ensures safe operation of the motor.

And (3) light weight: the aluminum inserts may replace portions of the conventional steel members, thereby reducing the weight of the overall motor.

In the prior art, an aluminum insert is generally fixed in a direct current injection stator by a press-fitting manner, for example, a motor with a stator assembly structure is disclosed in chinese patent No. cn20110110825. X, and mainly includes a rotor, an upper insulating cover, a stator frame, a stator core, an aluminum insert press-fitted on the stator core, a base plate assembly, a lower insulating cover, and an end cover that is separately matched with the aluminum insert. The stator core and the aluminum insert are formed into a stator assembly after injection molding. The stator component and the end cover are fixedly connected through a plurality of screws. The aluminum insert on the stator assembly is provided with a bearing chamber connected with the end cover, and a plurality of threaded holes which are positioned outside the bearing chamber and fixedly matched with the screws. The end cover is integrally formed with a boss for fixing with the bearing chamber of the aluminum insert, and a locking hole located around the boss and in locking fit with the screw. Although this kind of structure has solved the whole problem that is difficult to dismantle after impressing, unable reprocessing, still has following defect:

1. the assembly process is complex: the stator assembly structure in the prior art needs to assemble and connect a plurality of parts, increases assembly procedures and time, and reduces production efficiency.

2. Concentricity is difficult to ensure: since the aluminum insert and the stator core need to be connected by injection molding, a plastic material is injected into a mold at a high temperature during injection molding and is solidified during cooling. In this in-process, plastic materials's temperature variation can lead to the material shrink to influence connection accuracy and concentricity between aluminium inserts and the stator core, in addition, in the in-process of moulding plastics, the pressure of moulding plastics hardly keeps lasting evenly, and the inhomogeneous material that can lead to aluminium inserts and stator core junction distributes unevenly, causes concentricity not good, and then influences the performance of motor.

Disclosure of Invention

The utility model aims to provide a novel direct current injection stator with an aluminum insert, which aims at solving the problems existing in the prior art, and can improve the motor performance, simplify the production process, reduce the disassembly difficulty and improve the assembly efficiency.

The technical aim of the utility model is realized by the following technical scheme:

the novel direct current package injection stator with the aluminum inserts comprises a stator core, wherein a mounting hole is formed in the center of the centering core, the aluminum inserts are inserted into the mounting hole, the aluminum inserts comprise a motor connecting part and a bearing connecting part which are integrally formed, the outer diameter of the bearing connecting part is larger than that of the motor connecting part, the bearing connecting part is provided with a bearing mounting hole, a bearing can be inserted into the bearing mounting hole, a motor shaft hole which is concentrically arranged in the bearing mounting hole is formed in the motor connecting part, the inner diameter of the motor shaft hole is smaller than that of the bearing mounting hole, and the motor shaft hole extends into the bearing connecting part and is communicated with the bearing mounting hole; the stator core and the aluminum insert are wrapped with plastic, and the plastic can fix the stator core and the aluminum insert together.

As an improvement of the utility model, a plurality of threaded holes are formed in the bearing connecting part, and an end cover of an external motor can be detachably fixed at the front end of the bearing connecting part through screws.

As a further improvement of the utility model, a spline part is further processed and formed on the aluminum insert, the spline part is connected with the bearing connecting part, a through hole with the same diameter as the motor shaft hole is formed in the center of the spline part, the through hole and the motor shaft hole are arranged concentrically, a plurality of key grooves are formed in the outer ring of the spline part along the circumferential direction, and the plastic is embedded in the key grooves.

As a further improvement of the present utility model, a press-fit cover plate is attached to the rear end of the spline portion.

As a specific technical scheme of the utility model, the plastic is polyamide.

Preferably, an elastic washer is arranged on the front end face of the stator core in a sleeved mode, the aluminum insert is sleeved with the elastic washer, and plastic is wrapped on the elastic washer.

Compared with the prior art, the beneficial effect of this scheme is as follows: concentricity is higher: through fixing the aluminum insert and the stator core together by plastic package, concentricity between the aluminum insert and the stator core is ensured, thereby improving the running efficiency and performance of the motor. The production process is simplified: the utility model adopts plastic injection technology to replace the traditional stator framework, reduces secondary processing and other framework installation procedures, and reduces production cost. The structure is firm: the design of spline portion makes the plastic inlay and establishes in the keyway, can prevent to take place relative slip between aluminium inserts and the stator core, has improved the stability and the reliability of motor.

Drawings

FIG. 1 is a schematic diagram of a connection structure between a stator and an aluminum insert according to the present utility model;

fig. 2 is a sectional view taken at the angle B-B in fig. 1.

Reference numerals

1. Centering the iron core; 2. a mounting hole; 3. an aluminum insert; 4. a motor connecting part; 5. a bearing connection portion; 6. a step surface; 7. a plastic cement; 8. bearing mounting holes; 9. a motor shaft hole; 10. a threaded hole; 11. a spline portion; 12. a through hole; 13. a key slot; 14. pressing the cover plate; 15. and an elastic gasket.

Detailed Description

The utility model is further described in detail below with reference to fig. 1-2 by way of specific examples, which are intended to be illustrative only and not limiting as to the scope of the utility model.

As shown in fig. 1 and 2, this embodiment discloses a novel direct current package of taking aluminum inserts is penetrated the stator, including stator core 1, be formed with mounting hole 2 in the central authorities of centering core 1, peg graft in mounting hole 2 and have aluminum inserts 3, aluminum inserts 3 include integrated into one piece's motor connecting portion 4 and bearing connecting portion 5, motor connecting portion 4 are located the rear of bearing connecting portion 5, the external diameter of motor connecting portion 4 is about to be less than the external diameter of bearing connecting portion 5 for step face 6 has been formed between motor connecting portion 4 and bearing connecting portion 5, and this step face 6 laminating is on stator core 1's preceding terminal surface. A bearing mounting hole 8 is formed in the bearing connecting part 5, a bearing (not shown in the figure) can be embedded in the bearing mounting hole 8, a motor shaft hole 9 which is concentric with the bearing mounting hole 8 is formed in the motor connecting part 4, the inner diameter of the motor shaft hole 9 is smaller than that of the bearing mounting hole 8, and the motor shaft hole 9 extends into the bearing connecting part 5 and is communicated with the bearing mounting hole 8; the plastic 7 wraps the stator core 1 and the aluminum insert 3, and the plastic fixes the stator core 1 and the aluminum insert 3 together through an injection process.

When the aluminum insert 3 and the stator core 1 are fixed together using a plastic injection process, the plastic 7 softens at high temperature and fills the entire mold cavity. During this process, the plastic 7 fills the gap between the outer diameter of the motor connection 4 and the inner diameter of the mounting hole 2. As the plastic 7 cools, it will shrink and tightly secure the aluminum insert 3 with the stator core 1. The shrinkage process can compensate the deviation between the outer diameter of the aluminum insert and the inner diameter of the stator core mounting hole to a certain extent. The reason why the cooling shrinkage can achieve natural centering is that the plastic 7 exerts a uniform shrinkage force on the aluminum insert 3 when it shrinks. This uniform shrinkage force helps to automatically adjust the aluminum insert 3 to a central position within the stator core mounting hole 2. In other words, the aluminum insert 3 is guided to a more balanced position by the shrinkage force of the plastic 7, thereby realizing a concentric arrangement.

Compared with the prior art, the aluminum insert 3 and the stator core 1 are concentrically arranged in the interference fit mode, and the plastic injection mode can be used for adaptively filling the gap between the aluminum insert 3 and the stator core 1 in the cooling shrinkage process, so that deviation is eliminated or reduced, and concentric arrangement is realized. The interference fit mode needs to accurately control the size of the part in advance, which is difficult. On the other hand, the plastic rubber package can form a uniform buffer layer, so that vibration and noise are effectively reduced, and the running stability and comfort of the motor are improved. The fixation of the aluminum insert 3 and the stator core 1 can be completed at one time by adopting a plastic injection process, and multiple processing and assembly are avoided. In contrast, the interference fit method requires more steps such as grinding, heating, etc. In addition, in the cooling shrinkage process, the plastic cement can tightly fill the gap between the aluminum insert 3 and the stator core 1 to form good sealing performance and prevent impurities such as lubricating oil, dust and the like from entering. The interference fit mode has the problem of poor sealing performance. Finally, the plastic injection process is adopted, and the plastic material has certain insulating property, so that current leakage can be effectively prevented, and the safety performance of the motor is improved, which cannot be realized by an interference fit mode. .

In addition, a plurality of screw holes 10 are formed in the bearing connection portion 5, and in this embodiment, three screw holes 10 are provided in total, and they are distributed at regular intervals in a triangular shape. The end cap of the external motor can be detachably fixed to the front end of the bearing connecting portion 5 by means of screws, thereby closing the bearing in the bearing mounting hole 8.

In order to ensure that the stator core 1 and the aluminum insert 3 do not rotate relatively, a spline part 11 is further processed and formed on the aluminum insert 3, the spline part 11 is connected with the bearing connecting part 5, a through hole 12 with the same diameter as the motor shaft hole 9 is formed in the center of the spline part 11, the through hole 12 is concentric with the motor shaft hole 9, a plurality of key grooves 13 are formed in the outer ring of the spline part 11 along the circumferential direction, and the plastic 7 can flow into the key grooves 13 in the injection process and is embedded in the key grooves 13 after being cooled. A press-fit cover 14 is attached to the rear end of the spline portion 11.

An elastic washer 15 is arranged on the front end face of the stator core 1 in a cushioning mode, the elastic washer 15 is sleeved on the aluminum insert 3, and plastic 7 is wrapped outside the elastic washer 15. The elastic washer 15 can provide a frontal buffer on the one hand, and reduce vibration and impact generated during operation, thereby improving the stability and service life of the motor. On the other hand, the elastic washer 15 can compensate for a minute dimensional deviation or unevenness possibly existing between the aluminum insert 3 and the stator core 1 to some extent, contributing to improvement in assembly accuracy and overall performance of the motor. The elastic gasket 15 can also play a certain sealing role, prevent impurities such as lubricating oil, dust and the like from entering the motor and protect key parts of the motor. In addition, during operation of the motor, the aluminum insert 3 and the stator core 1 thermally expand due to heat. The elastic washer 15 can compensate for such thermal expansion to some extent, preventing the internal structure of the motor from being damaged by excessive expansion.

For easy disassembly, the plastic is preferably Polyamide (also called nylon), and generally, disassembly is not required, and when the parts are damaged and the replacement is required, the plastic can be melted by a heat treatment method or a chemical method, so that the stator core 1 and the aluminum insert 3 can be taken out conveniently by a worker, and the heat treatment method is to soften or melt the plastic by heating the surface of the stator core 1, and then to peel the plastic off by a tool. However, during the plastic stripping process of the tool, the tool should be carefully processed to avoid scratches, and care should be taken to control the heating temperature so as not to damage the stator core 1 and the aluminum insert 3.

It is preferred in this embodiment to melt the plastic 7 chemically, i.e. by dissolving the plastic 7 with a suitable solvent and then removing it from the stator core 1 and the aluminium insert 3 surface. It should be noted that the solvent is chosen to ensure non-corrosiveness to the stator and aluminum insert, toluene, xylene or dimethyl ketone being preferred solvents in this embodiment.

The whole assembly process of this embodiment is specifically as follows:

1. the preparation stage: first, we need to prepare all the components including the stator core, aluminum inserts, elastomeric washers, and plastic materials (e.g., polyamide) for overmolding. The stator core should have a preformed mounting hole.

2. Splicing: and plugging the aluminum inserts into the mounting holes of the stator core. The aluminum insert should include an integrally formed motor connection and bearing connection. At this time, the outer diameter of the bearing connection portion should be larger than that of the motor connection portion.

3. Gasket setting stage: an elastic washer is arranged on the front end face of the stator core. The elastic gasket is sleeved on the aluminum insert.

4. And (3) plastic injection stage: the required plastic material, such as polyamide, is prepared while ensuring that the aluminum insert has been properly inserted into the mounting hole of the stator core and that the elastomeric gasket has been slipped over the aluminum insert. The material needs to be melted or softened in advance for application. Then, the stator core and the aluminum insert are placed in a specific overmold. The shape and size of the mold will be tailored to the design of the stator assembly to ensure that the plastic material will accurately fill the desired location. The mold cavity in the mold can accommodate the stator core, the aluminum insert and the elastic gasket, and reserves enough space for the plastic material to fill and form the injection layer. A plastic material is then filled into the gap between the stator core and the aluminum insert, and the outside of the elastomeric gasket.

5. Cooling and solidifying: after the plastic material is filled, it needs to be allowed to cool and solidify. In this process, the plastic material changes from a liquid state to a solid state, forming a solid plastic coating. The cooling shrinkage of the plastic material during this process helps to achieve better concentricity of the centering core and the aluminum insert. After the plastic is solidified, a post-treatment step is needed to remove the redundant plastic material and polish the surface of the plastic injection layer to ensure that the plastic injection layer is smooth and meets the specification requirements.

6. Inspection: the assembled components are inspected to ensure that they have been securely fastened together and that concentricity and other related requirements are met.

The present embodiment is only for explanation of the present utility model and is not to be construed as limiting the present utility model, and modifications to the present embodiment, which may not creatively contribute to the present utility model as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present utility model.

Claims (6)

1. The utility model provides a novel take aluminium inserts direct current package to penetrate stator, including stator core, be formed with the mounting hole, its characterized in that at centering iron core central authorities: the mounting hole is inserted with an aluminum insert, the aluminum insert comprises a motor connecting part and a bearing connecting part which are integrally formed, the outer diameter of the bearing connecting part is larger than that of the motor connecting part, the bearing connecting part is provided with a bearing mounting hole, a bearing can be embedded in the bearing mounting hole, the motor connecting part is provided with a motor shaft hole which is concentrically arranged in the bearing mounting hole, the inner diameter of the motor shaft hole is smaller than that of the bearing mounting hole, and the motor shaft hole extends into the bearing connecting part and is communicated with the bearing mounting hole; the stator core and the aluminum insert are wrapped with plastic, and the plastic can fix the stator core and the aluminum insert together.

2. The novel direct current package injection stator with aluminum inserts according to claim 1, wherein: the bearing connecting part is provided with a plurality of threaded holes, and the end cover of the external motor can be detachably fixed at the front end of the bearing connecting part through screws.

3. The novel direct current package injection stator with aluminum inserts according to claim 2, wherein: the aluminum insert is further provided with a spline portion in a machining mode, the spline portion is connected with the bearing connecting portion, a through hole with the same diameter as that of the motor shaft hole is formed in the center of the spline portion, the through hole and the motor shaft hole are arranged concentrically, a plurality of key grooves are formed in the outer ring of the spline portion along the circumferential direction, and the plastic is embedded in the key grooves.

4. The novel direct current injection stator with aluminum inserts according to claim 3, wherein: and the rear end of the spline part is connected with a pressing cover plate.

5. The novel direct current package injection stator with aluminum inserts according to claim 1, wherein: the plastic is polyamide.

6. The novel direct current package injection stator with aluminum inserts according to claim 1, wherein: an elastic gasket is arranged on the front end face of the stator core in a sleeved mode, the aluminum insert is sleeved with the elastic gasket, and plastic is wrapped on the elastic gasket.