Motor rotor centrifugal aluminum casting middle mold with closed grooves

Abstract

The utility model relates to a motor rotor centrifugal aluminum casting middle die with closed grooves. The motor rotor centrifugal aluminum casting middle die comprises an upper die plate and a lower die plate. The upper die plate is in a circular ring shape, an upward first annular protrusion is arranged on the upper die plate, and the height H of the first annular protrusion ranges from 35 mm to 45 mm. The upper template is detachably mounted at the upper end part of the supporting rod group; the lower die plate is in a circular ring shape, the lower die plate is located below the upper die plate and located on the same axis with the upper die plate, and the inner diameter of the circular ring of the lower die plate is 0.5-1.0 mm smaller than that of the circular ring of the upper die plate. The lower die plate is provided with a downward second annular protrusion, and the height h of the second annular protrusion ranges from 35 mm to 45 mm. The lower die plate is installed at the lower end of the supporting rod set. The middle die has the advantages that the manufacturing of the middle die is shortened and simplified, and the middle die can be quickly adjusted along with the length change of the rotor iron core instead of remanufacturing a new middle die when the middle die is suitable for the production of motors with different iron lengths and different efficiencies.

Description

Technical Field

[0001] The utility model relates to a centrifugal aluminum casting middle mold for an electric motor rotor with a closed slot. Background Art

[0002] At present, in the aluminum casting of rotors of low-voltage medium and large-sized electric motors, most rotors are cast by centrifugal aluminum casting. Because when casting the aluminum cage (end ring + bar) of the centrifugal aluminum casting rotor, the structure is compact and the quality of the cast aluminum is good. Although die casting has a lower labor intensity, due to the presence of many pores in the end ring and bars of the rotor, which is equivalent to a reduction in the cross-sectional area of the end ring and bars, one of the five major losses of the motor - aluminum consumption - increases, and the motor efficiency decreases. In today's context where the requirements for energy conservation and environmental protection are getting higher and higher and the motor efficiency is constantly improving, this is undoubtedly disadvantageous. When centrifugally casting aluminum for the rotors of medium and large-sized electric motors, although the structure of the middle mold is simple, the manufacturing of the middle mold is quite troublesome and generally requires multiple processes and a long time to complete. The required processes are roughly as follows: casting sand for the casting - aging treatment - semi-finish turning of the middle mold - finish turning of the middle mold - wire cutting into three pieces - repairing burrs - printing model identification - trial fitting with the upper and lower leaf molds. If the fitting is not good enough, the three pieces have to be welded together and reworked until the requirements are met. It takes a long time to process a middle mold through so many processes, and it is even more inconvenient to adjust the core length during design. Summary of the Invention

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a centrifugal aluminum casting middle mold for an electric motor rotor with a closed slot, which shortens and simplifies the manufacturing of the middle mold. When producing electric motors with different iron lengths and different efficiencies, the middle mold can be quickly adjusted according to the change in the length of the rotor core, that is, only by changing the length of the detachable support rod group instead of manufacturing a new middle mold, so as to quickly produce the product. In addition, the use of a closed slot for the rotor improves the performance of the motor. Since when the rotor is blanked at high speed, the air gap between the stator and the rotor is punched out together, the outer circle of the rotor does not need to be machined, the production efficiency of the rotor is improved. At the same time, because the outer surface of the rotor is not machined, compared with the original machining, the burrs between the outer circle slices of the rotor will not stick to each other, reducing the surface loss of the motor, improving the efficiency of the motor, and reducing the temperature rise.

[0004] To achieve the above purpose, the technical solution of the utility model is realized as follows. It is a centrifugal aluminum casting middle mold for an electric motor rotor with a closed slot, which is characterized by including:

[0005] Upper template; the upper template is annular, and there is an upward first annular protrusion on the upper template. The height H of the first annular protrusion is 35 mm - 45 mm; the upper template is detachably installed at the upper end of the support rod group; and a lower template; the lower template is annular, the lower template is located below the upper template and on the same axis, and the inner diameter of the ring of the lower template is 0.5 - 1 mm smaller than the inner diameter of the ring of the upper template; there is a downward second annular protrusion on the lower template, and the height h of the second annular protrusion is 35 mm - 45 mm; the lower template is installed at the lower end of the support rod group.

[0006] In this technical solution, on the inner side wall of the upper part of the first annular protrusion, there is a first chamfer inclined to the left, and the inclination angle of the first chamfer is 10° ± 5°.

[0007] In this technical solution, on the outer side wall of the first annular protrusion, there is a first bevel inclined from bottom to top and to the right, and the inclination angle b of the first bevel is 20° ± 5'.

[0008] In this technical solution, on the outer side wall of the second annular protrusion, there is a second bevel inclined from top to bottom and to the right, and the inclination angle b of the second bevel is 20° ± 5'.

[0009] The advantages of the present utility model compared with the prior art are as follows: shortening and simplifying the manufacturing of the middle mold. When adapting to the production of motors with different iron lengths and different efficiencies, the middle mold can be quickly adjusted with the change of the rotor core length instead of manufacturing a new middle mold, so as to quickly produce products. The rotor adopts a closed slot to improve the performance of the motor. Since when the rotor rotates at high speed, the air gap rushes out together, the outer circle of the rotor does not need to be machined, and the production efficiency of the rotor is improved. At the same time, because the outer surface of the rotor is not machined, compared with the original machining, the burrs between the rotor outer circle sheets will not stick to each other, reducing the surface loss of the motor, improving the efficiency of the motor, and reducing the temperature rise. Description of the Drawings

[0010] Figure 1 is the structural schematic diagram of the present utility model;

[0011] Figure 2 is Figure 1 the top view of

[0012] Figure 3 is Figure 2 the A - A cross-sectional view of

[0013] Figure 4 is Figure 3 the enlarged view of the partial B;

[0014] Figure 5 is Figure 3 the enlarged view of the partial C;

[0015] Figure 6 It is a motor rotor with a closed slot. Specific embodiments

[0016] The following further describes the specific embodiments of the present invention in conjunction with the drawings. It should be noted here that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation on the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0017] As Figures 1 to 6 shown, it is a centrifugal casting aluminum middle mold for a motor rotor with a closed slot, including:

[0018] An upper template 1; the upper template 1 is in a circular ring shape, and there is an upward first annular protrusion 11 on the upper template 1. The height H of the first annular protrusion 11 is 35 mm or 40 mm or 45 mm, which can be designed according to the size of the rotor; the upper template 1 is detachably installed at the upper end of the support rod group 2; and

[0019] A lower template 3; the lower template 3 is in a circular ring shape, the lower template 3 is located below the upper template 1 and on the same axis. The inner diameter of the circular ring of the lower template 3 is 0.5 mm or 0.75 mm or 1 mm smaller than the inner diameter of the circular ring of the upper template 1 to improve the positioning accuracy when the rotor enters; there is a downward second annular protrusion 31 on the lower template 3. The height h of the second annular protrusion 31 is 35 mm or 40 mm or 45 mm; the lower template 3 is installed at the lower end of the support rod group 2.

[0020] During operation, the gate and the upper leaf mold are sequentially placed on the upper template 1 and positioned by the first annular protrusion 1, and are connected to the upper leaf mold. The rotor is placed between the upper template 1 and the lower template 3. The lower leaf mold is placed below the lower template 3 and positioned by the second annular protrusion 31. The other end of the lower leaf mold is connected to the base of the centrifuge. When casting aluminum, the molten aluminum is poured into the rotor through the gate, and the rotor is formed under the action of centrifugal force.

[0021] In this embodiment, on the inner side wall of the upper part of the first annular protrusion 11, there is a first chamfer 112 inclined to the left. The inclination angle a of the first chamfer 112 is about 5° or 10° or 15°, which is convenient for the rotor to smoothly enter the middle mold.

[0022] In this embodiment, on the outer side wall of the first annular protrusion 11, there is a first bevel edge 111 inclined upward and to the right. The inclination angle b of the first bevel edge 111 is 20° ± 5'.

[0023] In this embodiment, a second bevel edge 311 that slopes downward and to the right from top to bottom is provided on the outer sidewall of the second annular protrusion 11, and the inclination angle b of the second bevel edge 311 is 20 ± 5'.

[0024] The above has made a detailed description of the embodiments of the present utility model in conjunction with the accompanying drawings, but the present utility model is not limited to the described embodiments. For those of ordinary skill in the art, various changes, modifications, substitutions, and deformations of these embodiments without departing from the principles and purposes of the present utility model still fall within the protection scope of the present utility model.

Claims

1. A centrifugal casting aluminum middle mold for a motor rotor with a closed groove, characterized in that Comprising: An upper template (1); the upper template (1) is annular, and an upward first annular protrusion (11) is provided on the upper template (1), and the height H of the first annular protrusion (11) is 35 mm - 45 mm; the upper template (1) is detachably installed at the upper end of the support rod group (2); and A lower template (3); the lower template (3) is annular, the lower template (3) is located below the upper template (1) and on the same axis, and the inner diameter of the ring of the lower template (3) is 0.5 - 1.0 mm smaller than the inner diameter of the ring of the upper template (1); a downward second annular protrusion (31) is provided on the lower template (3), and the height h of the second annular protrusion (31) is 35 mm - 45 mm; the lower template (3) is installed at the lower end of the support rod group (2).

2. The centrifugal casting aluminum middle mold for the motor rotor with a closed groove according to claim 1, wherein A first chamfer (112) inclined to the left is provided on the inner side wall of the upper part of the first annular protrusion (11), and the inclination angle a of the first chamfer (112) is 10° ± 5°.

3. The centrifugal casting aluminum middle mold for the motor rotor with a closed groove according to claim 1, characterized in that A first bevel edge (111) inclined from bottom to top and to the right is provided on the outer side wall of the first annular protrusion (11), and the inclination angle of the first bevel edge (111) is 20° ± 5'.

4. The centrifugal casting aluminum middle mold of the motor rotor with a closed groove according to claim 1, characterized in that A second bevel edge (311) inclined from top to bottom and to the right is provided on the outer side wall of the second annular protrusion (31), and the inclination angle b of the second bevel edge (311) is 20° ± 5'.

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