Rotor low pressure casting apparatus

Abstract

The utility model discloses a rotor low pressure casting equipment belongs to motor field, and the mould is equipped with the cavity and with the cavity communication's inlet, and the inlet is located the cavity bottom, and the rotor low pressure casting equipment still includes the liquid inlet structure, and the liquid inlet structure includes the heat preservation stove and goes up the liquid pipe, and the heat preservation stove is used for storing liquid metal, and the heat preservation stove communicates with the gas inlet, and goes up the liquid pipe one end and heat preservation stove bottom connection, and goes up the liquid pipe other end and inlet connection, and the gas inlet gas extrusion liquid metal in the heat preservation stove, makes liquid metal through going up the liquid pipe and enters the cavity and forms the rotor, through above -mentioned design, the rotor manufacturing process is low pressure casting, and the production cost is low, and the rotor internal porosity of manufacture is low.

Description

Technical Field

[0001] This utility model relates to the field of motors, and in particular to low-pressure casting equipment for rotors. Background Technology

[0002] An electric motor consists of a stator and a rotor, with the rotor being the rotating part of the motor. The working principle of the motor rotor is based on the principles of electromagnetic induction and electromagnetic force. When the stator is energized and generates a rotating magnetic field, the conductors (windings or squirrel cage bars) in the rotor are induced with current in the magnetic field. These induced currents interact with the stator magnetic field to generate electromagnetic torque, thereby causing the rotor to start rotating.

[0003] Rotors are typically manufactured using high-pressure casting, which offers advantages such as rapid molding, high strength, and fewer machining steps. However, high-pressure casting also has drawbacks including high production costs, long production cycles, and high internal porosity. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, one of the objectives of this utility model is to provide a low-pressure casting equipment for rotors with low manufacturing cost and low internal porosity.

[0005] One of the objectives of this utility model is achieved through the following technical solution:

[0006] A rotor low-pressure casting equipment includes a mold, the mold having a cavity and a feed inlet communicating with the cavity, the feed inlet being located at the bottom of the cavity. The equipment further includes a liquid inlet structure, comprising a holding furnace and a riser pipe. The holding furnace stores liquid metal and is connected to an air inlet. One end of the riser pipe is connected to the bottom of the holding furnace, and the other end is connected to the feed inlet. Air is introduced through the air inlet to compress the liquid metal in the holding furnace, causing the liquid metal to enter the cavity through the riser pipe to form a rotor.

[0007] Furthermore, the liquid inlet structure also includes a pressure tank, the heat preservation furnace is located inside the pressure tank, the air inlet is located on the pressure tank, and the heat preservation furnace is an open structure.

[0008] Furthermore, the liquid inlet structure also includes a top plate, the pressure tank is fixed to the bottom of the top plate, and the mold is fixed to the top of the top plate.

[0009] Furthermore, the mold includes an upper mold assembly, a middle mold assembly, and a lower mold assembly, with the middle mold located between the upper mold assembly and the lower mold assembly. The upper mold assembly, the middle mold assembly, and the lower mold assembly together form the cavity.

[0010] Furthermore, the mold also includes a shaft core located within the cavity.

[0011] Furthermore, the lower mold assembly is provided with a feed inlet, the bottom of the shaft core is located in the feed inlet, and the bottom of the shaft core and the inner wall of the feed inlet form a feed channel.

[0012] Furthermore, the feed inlet is conical.

[0013] Furthermore, the lower mold assembly includes a lower mold fixing plate and a lower template fixed to the lower mold fixing plate. The lower mold fixing plate is fixed to the top of the liquid inlet structure, and the inlet is located on the lower template.

[0014] Furthermore, the mold also includes a vent plug, which is provided on the lower template.

[0015] Furthermore, the intermediate mold has a two-lobed structure.

[0016] Compared with the prior art, the rotor low-pressure casting equipment mold of this utility model has a cavity and a feed port connected to the cavity. The feed port is located at the bottom of the cavity. The rotor low-pressure casting equipment also includes a liquid inlet structure, which includes a holding furnace and a riser pipe. The holding furnace is used to store liquid metal and is connected to an air inlet. One end of the riser pipe is connected to the bottom of the holding furnace, and the other end of the riser pipe is connected to the feed port. Air is introduced through the air inlet to compress the liquid metal in the holding furnace, so that the liquid metal enters the cavity through the riser pipe to form a rotor. Through the above design, the rotor manufacturing process is low-pressure casting, which results in low manufacturing cost and low internal porosity of the manufactured rotor. Attached Figure Description

[0017] Figure 1 This is a perspective view of the rotor low-pressure casting equipment of this utility model;

[0018] Figure 2 for Figure 1 A three-dimensional sectional view of a rotor low-pressure casting equipment;

[0019] Figure 3 for Figure 1 A three-dimensional view of the mold for a low-pressure rotor casting equipment;

[0020] Figure 4 for Figure 3 A three-dimensional sectional view of the mold;

[0021] Figure 5 for Figure 1 A three-dimensional sectional view of the rotor low-pressure casting equipment in use;

[0022] Figure 6 for Figure 5 An enlarged view of the rotor low-pressure casting equipment in operating condition A.

[0023] In the diagram: 10. Liquid inlet structure; 11. Top plate; 12. Pressure tank; 120. Air inlet; 13. Insulation furnace; 14. Lifting pipe; 20. Mold; 21. Upper mold assembly; 210. Upper mold fixing plate; 211. First fastener; 212. Upper template; 22. Middle mold; 23. Lower mold assembly; 230. Lower mold fixing plate; 2301. Mounting hole; 231. Second fastener; 232. Lower template; 2320. Through hole; 2321. Feed port; 24. Shaft core; 30. Liquid metal; 40. Rotor; 41. Iron core; 42. Guide bar. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or it can be fixed through another intermediate component. When a component is said to be "connected to" another component, it can be directly connected to the other component or it may be fixed through another intermediate component. When a component is said to be "set on" another component, it can be set directly on the other component or it may be set through another intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] Please see Figures 1 to 4 The rotor low-pressure casting equipment of this utility model includes a liquid inlet structure 10 and a mold 20. The mold 20 is located at the bottom of the liquid inlet structure 10, and the liquid inlet structure 10 injects low-pressure molten metal into the mold 20. In this embodiment, the molten metal is molten aluminum.

[0028] The liquid inlet structure 10 includes a top plate 11, a pressure tank 12, a holding furnace 13, and a riser pipe 14. The pressure tank 12 is fixed to the bottom of the top plate 11 and has an air inlet 120 for introducing compressed air, thereby increasing the pressure inside the holding furnace 13 and allowing the molten metal inside the holding furnace 13 to enter the cavity of the mold 20 along the riser pipe 14. The holding furnace 13 is located inside the pressure tank 12, and its top is fixed to the top plate 11. The holding furnace 13 is used to store and keep the molten metal warm. The top of the holding furnace 13 is open. The riser pipe 14 is located inside the holding furnace 13, with its bottom near the bottom of the holding furnace 13 and its top extending into the mold 20 to facilitate liquid supply to the cavity.

[0029] The mold 20 includes an upper mold assembly 21, a middle mold 22, a lower mold assembly 23, and a shaft core 24. The upper mold assembly 21, the middle mold 22, and the lower mold assembly 23 together form a cavity, and the shaft core 24 is located in the cavity and is used to form mounting holes on the rotor for mounting the rotating shaft.

[0030] Specifically, the upper mold assembly 21 includes an upper mold fixing plate 210, a first fastener 211, an upper template 212, and a vent plug. The upper template 212 is fixed to the bottom of the upper mold fixing plate 210 by the first fastener 211. The vent plug is installed on the upper template 212 and is used to vent air when liquid enters the cavity.

[0031] The middle mold 22 is located between the upper mold assembly 21 and the lower mold assembly 23. The middle mold 22 has a two-part structure, which facilitates the demolding of the iron core.

[0032] The lower mold assembly 23 includes a lower mold fixing plate 230, a second fastener 231, a lower mold template 232, and a vent plug. The lower mold template 232 is fixed to the top of the lower mold fixing plate 230 by the second fastener 231. The lower mold fixing plate 230 is fixed to the top plate 11 of the liquid inlet structure 10. The lower mold fixing plate 230 has a mounting hole 2301 for mounting the riser pipe 14. The lower mold template 232 has a through hole 2320 and a feed inlet 2321 communicating with the through hole 2320. The feed inlet 2321 is conical, and the shaft core 24 is partially located in the feed inlet 2321. The inner wall of the feed inlet 2321 and the bottom of the shaft core 24 form a feed channel. The width of the feed channel can be adjusted by adjusting the height of the shaft core 24. The vent plug is installed on the lower mold template 232 for venting when liquid enters the cavity.

[0033] Please continue reading. Figure 5 as well as Figure 6When using a low-pressure rotor casting machine, the iron core 41 is placed into the mold cavity. Compressed air enters the pressure tank 12 through the air inlet 120, compressing the liquid surface of the molten metal 30 in the holding furnace 13. The molten metal 30 enters the mold cavity of the mold 20 along the riser pipe 14, forming guide bars 42 and end rings on the iron core 41, thus forming the rotor 40. The mold is then opened by opening the upper mold assembly 21, removing the middle mold 22, and taking out the rotor 40. Release agent is sprayed into the upper and lower mold cavities and dried. The cast aluminum iron core 41 is placed in, the middle mold 22 is installed, the mold is closed, and the next rotor 40 is produced.

[0034] This application describes a low-pressure casting equipment for rotors. Molten metal 30 is smoothly filled from the bottom through a riser pipe 14, eliminating the need for a complex gating system. The riser and gating system has a low proportion (only 5-10%), making it suitable for casting precious metals (such as aerospace aluminum alloys) and reducing raw material costs. The metal solidifies under pressure (during the holding stage), ensuring sufficient feeding, reducing shrinkage cavities and porosity, refining grains, and resulting in lower porosity than high-pressure die-cast parts (the latter are prone to gas entrapment due to high-speed filling). The rotor 40 exhibits good tensile strength and elongation. Due to the slow filling speed, the surface temperature fluctuation of the mold 10 is only 50-100℃ (high-pressure die casting can reach over 300℃). The mold 10 has a lifespan of over 100,000 cycles, while high-pressure die-casting molds typically require repair after 50,000-80,000 cycles.

[0035] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model. These are all equivalent modifications and improvements made to the above embodiments based on the essential technology of this utility model, and all of these fall within the protection scope of this utility model.

Claims

1. A low-pressure casting equipment for rotors, comprising a mold, the mold having a cavity and a feed inlet communicating with the cavity, the feed inlet being located at the bottom of the cavity, characterized in that: The rotor low-pressure casting equipment also includes a liquid inlet structure, which includes a holding furnace and a riser pipe. The holding furnace is used to store liquid metal and is connected to an air inlet. One end of the riser pipe is connected to the bottom of the holding furnace, and the other end is connected to the feed inlet. Air is introduced through the air inlet to compress the liquid metal in the holding furnace, so that the liquid metal enters the mold cavity through the riser pipe to form a rotor. The mold includes an upper mold assembly, a middle mold, a lower mold assembly, and a core. The core is located in the cavity. The lower mold assembly has a feed inlet. The bottom of the core is located in the feed inlet. The bottom of the core and the inner wall of the feed inlet form a feed channel. The feed inlet is conical. The height of the core is adjustable to change the width of the feed channel.

2. The rotor low-pressure casting equipment according to claim 1, characterized in that: The liquid inlet structure also includes a pressure tank, the heat preservation furnace is located inside the pressure tank, the air inlet is located on the pressure tank, and the heat preservation furnace is an open structure.

3. The rotor low-pressure casting equipment according to claim 2, characterized in that: The liquid inlet structure also includes a top plate, the pressure tank is fixed to the bottom of the top plate, and the mold is fixed to the top of the top plate.

4. The rotor low-pressure casting equipment according to claim 1, characterized in that: The middle mold is located between the upper mold assembly and the lower mold assembly, and the upper mold assembly, the middle mold, and the lower mold assembly together form the cavity.

5. The rotor low-pressure casting equipment according to claim 1, characterized in that: The lower mold assembly includes a lower mold fixing plate and a lower template fixed to the lower mold fixing plate. The lower mold fixing plate is fixed to the top of the liquid inlet structure, and the inlet is located on the lower template.

6. The rotor low-pressure casting equipment according to claim 5, characterized in that: The mold also includes an exhaust plug, which is provided on the lower template.

7. The rotor low-pressure casting equipment according to claim 4, characterized in that: The middle mold has a two-part structure.

Images