Die-casting die for motor rotor

Abstract

The utility model provides a die-casting die for a motor rotor, which comprises a pouring tray, the pouring tray comprises a plurality of pouring gates arranged around the circle center of the pouring tray, the pouring gates penetrate through the pouring tray and form downward bulges on the lower surface of the pouring tray, and the extension direction of the pouring gates is perpendicular to the plane where the pouring tray is located; the cavity is located below the pouring tray, the cavity comprises a plurality of feeding ports, the feeding ports correspond to the pouring gates one to one, and the tail ends, close to the feeding ports, of the pouring gates are pouring gates; wherein at least one pouring gate is in the shape of a rounded rectangle, and the sectional area, parallel to the plane where the pouring tray is located, of at least one pouring gate is gradually reduced in the direction close to the cavity. According to the utility model, the number of local empty aluminum and air holes in the mouse cage die-casting process can be reduced, and the density of the mouse cage is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of compressor, specifically, relate to a die casting mould for motor rotor. BACKGROUND

[0002] The motor rotor of the compressor comprises an iron core of iron and a squirrel cage of aluminum, and the squirrel cage comprises aluminum bars and end rings arranged at both ends of the aluminum bars.

[0003] However, since the existing squirrel cage uses a point-shaped sprue inlet of the die casting mould during the die casting process, the point-shaped sprue inlet is the position where the molten aluminum liquid enters the cavity, and the diameter that is too large or too small will affect the process of filling the cavity with the aluminum liquid.

[0004] It should be noted that the information disclosed in the above background section is only used to enhance the understanding of the background of the utility model, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0005] Therefore, the utility model provides a die casting mould for motor rotor to at least solve the problem of local empty aluminum of the squirrel cage and the formation of pores caused by the existing die casting mould during the preparation of the squirrel cage.

[0006] The embodiment of the utility model provides a die casting mould for motor rotor, which comprises:

[0007] The pouring plate comprises a plurality of gates arranged around the center of the pouring plate, the gates penetrate through the pouring plate and form downward protrusions on the lower surface of the pouring plate, and the extension direction of the gates is perpendicular to the plane in which the pouring plate lies;

[0008] The cavity is located below the pouring plate, and the cavity comprises a plurality of material inlets, the material inlets correspond one-to-one to the gates, and the end of the gate close to the material inlet is a sprue inlet;

[0009] In the embodiment, the shape of at least one sprue inlet is a rounded rectangle, and the cross-sectional area of at least one gate parallel to the plane in which the pouring plate lies gradually decreases along the direction close to the cavity.

[0010] In some embodiments, the shape of each sprue inlet is a rounded rectangle, and the cross-sectional area of each gate parallel to the plane in which the pouring plate lies gradually decreases along the direction close to the cavity.

[0011] In some embodiments, the length of the rounded rectangle of the inlet port is D1, 4.0mm≤D1≤4.3mm, the width of the rounded rectangle is D2, 2.0mm≤D2≤2.5mm, and the radius of the rounded corner of the rounded rectangle is D3, 0.8mm≤D3≤1.0mm.

[0012] In some embodiments, the shape of the inlet port is a combination of a rectangle and two semicircles located on both sides of the rectangle, the length of the rectangle is D1, 4.0mm≤D1≤4.3mm, the width of the rectangle is D2, 2.0mm≤D2≤2.5mm, and the diameter of the semicircle is the same as the width of the rectangle.

[0013] In some embodiments, the height of the protrusion of the sprue above the lower surface of the mold plate is H1, 21.5mm≤H1≤21.8mm.

[0014] In some embodiments, the protrusion formed by the sprue on the lower surface of the mold plate is smoothly transitioned to the lower surface of the mold plate, the lower end width of the smooth transition section of the protrusion is D4, 6.3mm≤D4≤6.5mm, and the upper end width of the smooth transition section of the protrusion is D5, 8.3mm≤D5≤8.5mm.

[0015] In some embodiments, the angle between the outer surface of the protrusion formed by the sprue on the lower surface of the mold plate and the vertical direction is α, 13.5°≤α≤14.5°.

[0016] In some embodiments, the shape of each inlet port is a waist type, and each waist type faces the center of the mold plate.

[0017] In some embodiments, the extension direction of the sprue is axisymmetric.

[0018] In some embodiments, the length direction of each rounded rectangle is parallel to the line connecting the center of the mold plate and the center of the rounded rectangle.

[0019] Compared with the prior art, the die casting mold for the motor rotor provided by the utility model at least has the following beneficial effects:

[0020] The die casting mold for the motor rotor of the utility model, by designing the shape of the inlet port 12 of the die casting mold as a rounded rectangle, compared with the existing point-shaped inlet port, the cross-sectional area of the inlet port is increased, the filling speed of the aluminum liquid is increased, the density of the squirrel cage of the rotor is improved, and the performance of the motor is improved. In addition, under the same density, compared with the prior art, due to the increase of the cross-sectional area of the inlet port, the volume of the sprue is also increased accordingly, the volume of the recess formed by the sprue on the end ring surface of the squirrel cage is also increased, and the use of aluminum for the die casting end ring is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings incorporated into the specification and constituting a part of the specification show embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application. It is apparent that the drawings described below are only some embodiments of the present application, and other drawings can be obtained from these drawings by those skilled in the art without creative labor.

[0022] Figure 1 is a structural schematic diagram of a die casting die for a motor rotor in the related art;

[0023] Figure 2 is a structural schematic diagram of an end ring prepared using the die casting die for a motor rotor in Figure 1 ;

[0024] Figure 3 is a structural schematic diagram of a die casting die for a motor rotor provided by the present application;

[0025] Figure 4 is a structural schematic diagram of an end ring prepared using the die casting die for a motor rotor in Figure 3 ;

[0026] Figure 5 is a sectional schematic diagram of a sprue provided by the present application;

[0027] Figure 6 is a sectional schematic diagram of another sprue provided by the present application;

[0028] Figure 7 is a sectional schematic diagram of a runner extension direction of a die casting die for a motor rotor provided by the present application.

[0029] Reference signs:

[0030] 10, a pouring plate;

[0031] 11, a runner;

[0032] 12, a sprue;

[0033] 20, a cavity;

[0034] 30, an end ring. DETAILED DESCRIPTION

[0035] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations can, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein. Rather, these implementations are provided as example (s) so that this disclosure will be thorough and complete, and will fully convey the concept of the example implementation (s) to those skilled in the art. Like reference numerals in different drawings denote like or similar elements, and descriptions thereof will not be repeated.

[0036] The terms "first", "second", and similar terms as used in the description are not intended to denote any ordinal, quantity or importance, but are used to distinguish different constituent parts. In addition, in the description of the present application, the orientation or positional relationship indicated by the terms "upper", "lower", and the like is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0037] It should be noted that the features of the embodiments of the present application and different embodiments can be combined with each other without conflict.

[0038] In the related art, as shown in Figure 1 and Figure 2 , the shape of the runner 11' of the existing die casting mold for the motor rotor is circular, and the shape of the inlet is point-like. The diameter of the point-like inlet is too small, which affects the speed of filling the cavity with aluminum liquid, causes the aluminum liquid to solidify too early, and even insufficient filling, resulting in partial empty aluminum of the end ring and aluminum row of the squirrel cage 30', forming pores, affecting the density of the squirrel cage 30', and further affecting the performance of the motor.

[0039] Therefore, as shown in Figure 3 , Figure 4 , Figure 5 and Figure 6 , the embodiments of the present application provide a die casting mold for a motor rotor, comprising:

[0040] The pouring plate 10 comprises a plurality of runners 11 arranged around the center of the pouring plate 10, the runner 11 penetrates through the pouring plate 10 and forms a downward protrusion on the lower surface of the pouring plate 10, and the extension direction of the runner 11 is perpendicular to the plane in which the pouring plate 10 is located;

[0041] The cavity 20 is located below the pouring plate 10, and the cavity 20 comprises a plurality of inlet ports, the inlet ports correspond one-to-one to the runners 11, and the end of the runner 11 close to the inlet port is the inlet 12;

[0042] The shape of at least one inlet 12 is a rounded rectangle, and the cross-sectional area of at least one runner 11 parallel to the plane in which the pouring plate 10 is located gradually decreases in the direction close to the cavity 20.

[0043] The above setting, by designing the shape of the sprue 12 of the die casting mold as a rounded rectangle, increases the cross-sectional area of the sprue 12 compared to the existing point-shaped sprue 12, increases the filling speed of the molten aluminum, thereby improving the density of the squirrel cage of the rotor, improving the motor performance, and reducing the use of aluminum. Specifically, the density of the squirrel cage is improved to 88-90%, and the motor performance is improved by 0-0.2%. Under the same density, due to the increase in the cross-sectional area of the sprue 12, the volume of the runner 11 also increases accordingly, the volume of the recess formed by the runner 11 on the surface of the end ring 30 of the squirrel cage also increases, thereby reducing the use of aluminum in the die casting of the end ring 30.

[0044] In addition, the design that the cross-sectional area of at least one runner 11 parallel to the plane where the mold plate 10 is located gradually decreases in the direction close to the cavity 20 can also guide the flow of the molten aluminum, further improving the speed of the molten aluminum through the runner 11.

[0045] It should be noted that the above die casting mold can also compensate for the problem that the existing mold cannot match the speed of the die casting machine, and the rounded rectangular sprue 12 can also act as a cold chamber during the die casting process to reduce the temperature of the molten aluminum.

[0046] With reference to Figure 3 and Figure 4 In some embodiments, the shape of each sprue 12 is a rounded rectangle, and the cross-sectional area of each runner 11 parallel to the plane where the mold plate 10 is located gradually decreases in the direction close to the cavity 20. The above setting, by designing the shape of all sprues 12 of the die casting mold as a rounded rectangle, can further increase the filling speed of the molten aluminum, further improve the density of the squirrel cage of the rotor, further improve the motor performance, and further reduce the use of aluminum.

[0047] With reference to Figure 5 In some embodiments, the length of the rounded rectangle of the sprue 12 is D1, 4.0mm≤D1≤4.3mm, the width of the rounded rectangle is D2, 2.0mm≤D2≤2.5mm, and the rounded corner radius of the rounded rectangle is D3, 0.8mm≤D3≤1.0mm. For example, the length D1 of the rounded rectangle of the sprue 12 can be 4.0mm, 4.1mm, 4.2mm, or 4.3mm, etc. The width D2 of the rounded rectangle can be 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, or 2.5mm, etc. The rounded corner radius D3 of the rounded rectangle can be 0.8mm, 0.9mm, or 1.0mm, etc.

[0048] With reference to Figure 6In some embodiments, the gate 12 is a combination of a rectangle and two semicircles located on either side of the rectangle. The length of the rectangle is D1, 4.0mm ≤ D1 ≤ 4.3mm, and the width of the rectangle is D2, 2.0mm ≤ D2 ≤ 2.5mm. The diameter of the semicircles is the same as the width of the rectangle. For example, the length D1 of the rectangle can be 4.0mm, 4.1mm, 4.2mm, or 4.3mm, etc. The width D2 of the rectangle can be 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, or 2.5mm, etc.

[0049] like Figure 7 As shown, in some embodiments, the height of the runner 11 protruding from the lower surface of the gating plate 10 is H1, where 21.5mm ≤ H1 ≤ 21.8mm. For example, the height H1 of the runner 11 protruding from the lower surface of the gating plate 10 can be 21.5mm, 21.6mm, 21.7mm, or 21.8mm, etc.

[0050] Continue to refer to Figure 7 In some embodiments, the protrusion formed by the runner 11 on the lower surface of the gating plate 10 smoothly transitions to the lower surface of the gating plate 10. The lower end width of the smooth transition section of the protrusion is D4, where 6.3mm ≤ D4 ≤ 6.5mm, and the upper end width of the smooth transition section of the protrusion is D5, where 8.3mm ≤ D5 ≤ 8.5mm. For example, the lower end width D4 of the smooth transition section of the protrusion can be 6.3mm, 6.4mm, or 6.5mm, etc. The upper end width D5 of the smooth transition section of the protrusion can be 8.3mm, 8.4mm, or 8.5mm, etc.

[0051] In some embodiments, the angle between the outer surface of the protrusion formed by the runner 11 on the lower surface of the gating plate 10 and the vertical direction is α, where 13.5°≤α≤14.5°. For example, the angle α can be 13.5°, 14°, or 14.5°, etc.

[0052] In some embodiments, each gate 12 is waist-shaped, with each waist-shaped part facing the center of the gating plate 10. Specifically, the waist-shaped gate 12 can achieve the same technical effect as a rounded rectangle, which will not be elaborated here. It is understood that the shape of the gate 12 can also be any other shape that achieves the same technical effect as a rounded rectangle, and this application does not limit this.

[0053] In some embodiments, the cross-sectional shape of the runner 11 in the extending direction is axially symmetrical. The above arrangement can make the flow rate of molten aluminum liquid flowing through the runner 11 uniform, so that the aluminum liquid is cooled uniformly in the runner 11.

[0054] In some embodiments, the length direction of each rounded rectangle is parallel to the line connecting the center of the circle of the casting tray and the center of the rounded rectangle. The above arrangement can make the flow rate of the molten aluminum flowing through each sprue 11 uniform, so that the molten aluminum is uniformly cooled in the sprue 11 and the cavity 20.

[0055] It can be known from the above embodiments that the die casting die for the motor rotor provided by the utility model at least has the following beneficial effects:

[0056] The die casting die for the motor rotor of the utility model improves the sectional area of the pouring inlet by designing the shape of the pouring inlet 12 of the die casting die as a rounded rectangle, increases the filling speed of the aluminum liquid, thereby improving the density of the squirrel cage of the rotor and the performance of the motor; in addition, under the same density, compared with the prior art, the sectional area of the pouring inlet is improved, the volume of the sprue is also improved accordingly, the volume of the recess formed by the sprue on the end ring surface of the squirrel cage is also improved, thereby the use of aluminum for the die casting end ring can be reduced.

[0057] The above content is a further detailed description of the utility model in combination with specific optional embodiments, and cannot be considered as limiting the specific implementation of the utility model to these descriptions. For ordinary skilled persons in the technical field to which the utility model belongs, some simple deductions or substitutions can be made without departing from the concept of the utility model, and all of them should be considered as falling within the protection scope of the utility model.

Claims

1. A die casting mold for an electric machine rotor, characterized in that, The utility model relates to a kind of injection moulding machine, including: A pouring tray, the pouring tray includes a plurality of gates arranged around the center of the pouring tray, the gate penetrates the pouring tray and forms a downward protrusion at the lower surface of the pouring tray, the extension direction of the gate is perpendicular to the plane where the pouring tray is located; A cavity, the cavity is located below the pouring tray, the cavity includes a plurality of inlets, the inlet corresponds to the gate one by one, and the end of the gate close to the inlet is a pouring inlet; Wherein, the shape of at least one pouring inlet is a rounded rectangle, and the cross-sectional area of at least one gate parallel to the plane where the pouring tray is located gradually decreases along the direction close to the cavity.

2. The die casting mold for an electric motor rotor according to claim 1, characterized by, The shape of each pouring inlet is a rounded rectangle, and the cross-sectional area of each gate parallel to the plane where the pouring tray is located gradually decreases along the direction close to the cavity.

3. The die casting mold for an electric motor rotor according to claim 2, characterized by, The length of the rounded rectangle of the pouring inlet is D1, 4.0mm≤D1≤4.3mm, the width of the rounded rectangle is D2, 2.0mm≤D2≤2.5mm, and the rounded radius of the rounded rectangle is D3, 0.8mm≤D3≤1.0mm.

4. The die casting mold for an electric motor rotor according to claim 2, characterized by, The shape of the pouring inlet is a combination of a rectangle and two semicircles on both sides of the rectangle, the length of the rectangle is D1, 4.0mm≤D1≤4.3mm, the width of the rectangle is D2, 2.0mm≤D2≤2.5mm, and the diameter of the semicircle is the same as the width of the rectangle.

5. The die casting mold for an electric motor rotor according to claim 2, characterized by, The height of the gate protruding from the lower surface of the pouring tray is H1, 21.5mm≤H1≤21.8mm.

6. The die casting mold for an electric motor rotor according to claim 2, characterized by The protrusion formed by the gate on the lower surface of the pouring tray smoothly transitions with the lower surface of the pouring tray, the lower end width of the smooth transition section of the protrusion is D4, 6.3mm≤D4≤6.5mm, and the upper end width of the smooth transition section of the protrusion is D5, 8.3mm≤D5≤8.5mm.

7. The die casting mold for an electric motor rotor according to claim 2, characterized by, The angle between the outer surface of the protrusion formed by the gate on the lower surface of the pouring tray and the vertical direction is α, 13.5°≤α≤14.5°.

8. The die casting mold for an electric motor rotor according to claim 2, characterized by, The shape of each pouring inlet is a waist type, and each waist type faces the center of the pouring tray.

9. The die casting mold for an electric motor rotor according to claim 2, characterized by, The cross-sectional shape of the extension direction of the gate is axisymmetric.

10. The die casting mold for an electric motor rotor according to claim 2, characterized by, The length direction of each rounded rectangle is parallel to the line connecting the center of the pouring tray and the center of the rounded rectangle.

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