A kind of motor stator shell and manufacture method thereof
Technical field
The present invention relates to a kind of motor component, particularly a kind of shell of motor stator and manufacture method thereof.
Background technology
The stator casing design mix body structure of existing employing liquid cools, it comprises shell 1 and cover plate 5, sees Fig. 1, seals with two O type circles 3,4 between shell and cover plate, flows for 2 li by the fluid passage of cooling liquid in shell 1 and dispels the heat.The shortcoming of this structure maximum is exactly that seal request is high especially.If the sealing ring assembling is bad or inefficacy can cause the cooling liquid seepage, and then damage motor.Simultaneously, the motor stator shell of this structure, owing to be subjected to the restriction of the demoulding in the casting technique, fluid passage can't be designed to cross sectional shape complexity and the tiny groove of passage, thereby causes the area of dissipation of fluid passage of shell little, radiating effect is bad.
Summary of the invention
[0003] technical problem to be solved by this invention is to overcome the above-mentioned deficiency of prior art and a kind of motor stator shell is provided, and makes its more reasonable structure, cooling effect and sealing effectiveness better.
In order to obtain above-mentioned motor stator shell, the present invention also provides one, and processing is simple, product percent of pass is high, the manufacture method of a kind of motor stator shell of good reliability.
The present invention solves the problems of the technologies described above the technical scheme that is adopted:
The motor stator shell is characterized in that: described shell is as a whole, and enclosure embedding aluminium alloy core rod has a fluid passage in the aluminium alloy core rod, be provided with fluid hole and inlet opening between shell and fluid passage.
In the above-mentioned aluminium alloy core rod several grooves are set, can increase the contact area of shell and aluminium alloy core rod like this, can take the heat of shell by the liquid of the fluid passage in the aluminium alloy core rod better away.
Above-mentioned aluminium alloy core rod also can be replaced by other metals of good-extensibility.
Above-mentioned several support handles of aluminium alloy core rod arranged outside, the aluminium alloy core rod is positioned in the casting mold cavity when being convenient to make shell like this.
Usually with the method preparation of casting, sand casting method commonly used has gravitational casting, low pressure casting, lost foam casting to the motor stator shell.These three kinds of casting methods have his own strong points.Through comparing, gravitational casting and lost foam casting are not suitable for the shell of this complexity, select low pressure casting proper, but this method have following problem:
The fluid passage of cast casing inboard need be used core, and the little and out-of-shape in this fluid passage cross section is made difficult core.
For core is fixed in the die cavity, core must have outwardly directed support shank, and these support shank need be excavated after casting is good, and then with the cast material welding, in case but welding quality will cause the fluid passage leakage.
After casting finished, fluid passage cross section complexity was cleaned out very difficulty with the molding sand in the passage, and the molding sand of these depositions can directly influence the use of shell.
Be subjected to the restriction of sand casting process, the scale error of core, proterties error and surface roughness are all bigger, and this can directly cause fluid passage cross section tolerance big, and inwall is very coarse, thereby causes the shell wall thickness lack of homogeneity, shell rigidity variation.
The core of making of quartz sand causes the generation of bubble of casting easily, in case accompany trachoma and bubble in the shell wall thickness, will cause the airtight pressure test of shell to pass through.
In order to make above-mentioned motor stator shell, suitable manufacture method must correspondingly be provided, the invention provides a kind of manufacture method of motor stator shell for this reason, replace traditional core with the aluminium alloy core rod of hollow, in aluminium alloy core rod fluid passage, fill pressed powder, the aluminium alloy core rod is placed on as inserts in the die cavity of casting mould and casts, after the foundry goods cooling, aluminium alloy core rod and cast material are integrated, with the method for boring foundry goods is got through fluid passage in the aluminium alloy core rod from the outside then, form the liquid outlet and the inlet of shell, pour out pressed powder at last and promptly make needed motor stator shell.
The making step of above-mentioned aluminium alloy core rod is as follows:
1. hollow aluminium alloy extrusions stretches;
2. in the aluminium alloy extrusions fluid passage, fill resistant to elevated temperatures pressed powder, block with aluminium alloy extrusions welding of the same race at its both ends open place;
3. by the required fluid passage shape of shell shape bending is become the aluminium alloy core rod.
Compared with prior art, the invention has the advantages that:
1, because shell and lid are designed to one, whole cooling duct in the enclosure, good airproof performance can leakage.
2, shell adopts monolithic construction, good rigidly.
3, many grooves are arranged in the fluid passage, the heat dissipation channel area is big, good heat dissipation effect.Mainly be used on the generator and motor of high power density, be used for the cooling motor stator, thereby improve the operational efficiency and the reliability of motor.
4, more reasonable structure, simple, processing cost and assembly cost descend.
5, the cross sectional shape of fluid passage and fluid passage trajectory can not be subjected to the restriction of core technology, can be designed to very little very complicated fluid passage and cooling groove.
6, because the support shank of aluminium alloy core rod also is an aluminum alloy materials, do not need to cut out support shank again behind the casting forming and block with the aluminum alloy materials welding, simplified processing technology so greatly, improved the air-tightness and the rigidity of shell.
7, because aluminium alloy core rod inboard is more a lot of than core smooth outer surface, reduced the resistance of fluid passage so greatly, improved cooling effect cooling liquid.
8,,, so just improved the rigidity and the air-tightness of shell greatly so the wall thickness of shell can be cast very evenly because aluminium alloy core rod shape fabricating size, form accuracy and roughness are better than core greatly.
9, because the aluminium alloy core rod is an aluminum alloy materials, can not produce bubble during casting, improve the casting quality of shell so greatly.
10, because the fluid passage of aluminium alloy core rod part is filled with pressed powder when bending forming and casting, avoided aluminium alloy core rod fluid passage when bending forming, to be flattened like this, also reduce simultaneously the deflection of fluid passage when casting greatly, guaranteed the precision and the stability of foundry goods fluid passage size like this.
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