Impeller low-pressure casting device

Abstract

The utility model discloses an impeller low-pressure casting device which comprises a machine frame used for installing a casting device, a heat preservation furnace is fixedly arranged at the bottom in the machine frame, a liquid rising pipe is fixedly arranged at an outlet in the top of the heat preservation furnace, an inner cavity of the liquid rising pipe is communicated with a pouring gate of the casting device, and a heat preservation structure is arranged on the liquid rising pipe. The heat preservation structure comprises an interlayer sleeve and heating assemblies, the liquid rising pipe is sleeved with the interlayer sleeve, and the multiple heating assemblies are arranged on the interlayer sleeve in an annular array mode. The heat preservation device has the advantages that heat preservation is conducted on the riser tube, and molten metal flowing through the riser tube is kept in a molten state.

Description

Technical Field

[0001] This utility model relates to the field of casting technology, specifically to a low-pressure casting device for impellers. Background Technology

[0002] Low-pressure casting refers to a casting method in which the mold is typically placed above a sealed crucible, and compressed air is introduced into the crucible to create a low pressure (0.06–0.15 MPa) on the surface of the molten metal, causing the molten metal to rise through a riser pipe to fill the mold and control solidification.

[0003] For low-pressure casting of the impeller, dry compressed air or inert gas is introduced into the holding furnace. The pressure acting on the surface of the molten metal causes the molten metal in the holding furnace to smoothly fill the mold from bottom to top through the riser pipe and gating. After the casting has completely solidified, the gas pressure on the surface is released, allowing the unsolidified molten metal in the riser pipe and gating to flow back into the holding furnace by gravity. Then, the mold is opened and the casting is removed.

[0004] However, there is no corresponding insulation structure at the riser pipe. The molten metal flowing back and the residue at the riser pipe wall adhere to the inner wall of the riser pipe due to heat loss, which causes the inner wall of the riser pipe to thicken. Over time, this affects the lifting of the molten metal.

[0005] In view of this, we propose a low-pressure casting device for impellers. Utility Model Content

[0006] The purpose of this invention is to provide a low-pressure casting device for impellers to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a low-pressure impeller casting device, comprising a frame for mounting the casting device, a heat preservation furnace fixedly installed at the bottom of the frame, a riser pipe fixedly installed at the top outlet of the heat preservation furnace, the inner cavity of the riser pipe communicating with the gating channel of the casting device, and a heat preservation structure arranged on the riser pipe;

[0008] The insulation structure includes a jacket and heating components. The jacket is fitted onto the riser pipe, and multiple heating components are arranged in a ring array on the jacket.

[0009] Preferably, a heat-conducting layer is fixedly provided on the inner wall of the inner circumference of the jacket, and the heat-conducting layer is wavy.

[0010] Preferably, the heating assembly includes a U-shaped plate, which is snapped onto the outer periphery of the interlayer sleeve. A slot is fixedly provided on the inner side of the longitudinal section of the U-shaped plate, and a heater body is arranged in the slot. The slot and the heater body pass through a perforation opened on the outer periphery of the interlayer sleeve, and the heater body extends into the inner cavity of the interlayer sleeve. The wire connected to the heater body passes through the perforation and extends out through the U-shaped plate.

[0011] Preferably, a transverse section of the U-shaped plate is fixedly connected to the top of the interlayer sleeve by bolts.

[0012] Preferably, an abutment spring is provided at the bottom of the inner cavity of the slot, and the heater body is inserted into the inner cavity of the slot, with the abutment spring engaging with the heater body.

[0013] Preferably, the abutment spring is arc-shaped, and the arched section of the abutment spring contacts the outer shell of the heater body.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model, by setting up a jacket and heating components, has the advantages of heat preservation of the riser tube and keeping the molten metal flowing through the riser tube in a molten state. It solves the problem that the molten metal flowing back and the residue at the wall of the riser tube are due to heat loss and adhere to the inner wall of the riser tube, which leads to the thickening of the inner wall of the riser tube and affects the rise of the molten metal over time.

[0016] 2. This utility model, by setting up a U-shaped plate, bolts, slots and abutment springs, has the advantage of being able to disassemble and replace the damaged heater body separately, which is convenient for maintenance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the connection of the thermal insulation structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the connection structure of the heating component of this utility model;

[0020] Figure 4 This is an exploded view of the sandwich sleeve of this utility model;

[0021] Figure 5 This is a schematic diagram of the heating component structure of this utility model;

[0022] Figure 6 For the present utility model Figure 5 Enlarged diagram of point A.

[0023] In the diagram: 100, frame; 200, insulation furnace; 300, riser pipe; 400, insulation structure; 401, jacketed sleeve; 402, heating assembly;

[0024] 4011, Perforation; 4012, Thermal conductive layer;

[0025] 4021, U-shaped plate; 4022, slot; 4023, heater body; 4024, bolt; 4025, abutment spring. Detailed Implementation

[0026] 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.

[0027] This utility model provides two embodiments.

[0028] Example 1

[0029] Please see Figures 1 to 5 A low-pressure impeller casting device includes a frame 100 for mounting the casting device. The frame 100 also houses a main unit, a hydraulic system, a liquid level pressurization device, an electrical control system, and a mold cooling system. A holding furnace 200 is fixedly installed at the bottom of the frame 100. A riser pipe 300 is fixedly installed at the top outlet of the holding furnace 200. The inner cavity of the riser pipe 300 communicates with the gating system of the casting device. Dry compressed air or inert gas is introduced into the holding furnace 200. By means of the pressure acting on the surface of the molten metal, the molten metal in the holding furnace 200 is smoothly filled into the mold from bottom to top through the gating system via the riser pipe 300. An insulation structure 400 is arranged on the riser pipe 300.

[0030] The insulation structure 400 includes a jacketed sleeve 401 and heating components 402. The jacketed sleeve 401 is fitted onto the riser pipe 300, and multiple heating components 402 are arranged in a ring array on the jacketed sleeve 401. The heat generated by the heating components 402 is transferred to the riser pipe 300, thereby insulating the riser pipe 300. This prevents the riser pipe 300 from absorbing excessive heat from the molten metal as it flows through, thus preventing the temperature of the molten metal from dropping too much and preventing the molten metal in contact with the inner wall of the riser pipe 300 from cooling down excessively and adhering to the wall.

[0031] This invention, by setting up a jacketed sleeve 401 and a heating component 402, has the advantages of heat preservation of the riser tube 300 and keeping the molten metal flowing through the riser tube 300 in a molten state. It solves the problem that the residual molten metal at the wall of the riser tube 300 due to heat loss adheres to the inner wall of the riser tube 300, causing the inner wall of the riser tube 300 to thicken and affecting the rise of the molten metal over time.

[0032] A heat-conducting layer 4012 is fixedly provided on the inner wall of the inner circumference of the jacket sleeve 401. The heat-conducting layer 4012 is wavy. The increased area of ​​the heat-conducting layer 4012 on the inner circumference of the jacket sleeve 401 helps to conduct heat to the riser pipe 300.

[0033] Example 2

[0034] Based on the technical content of Embodiment 1 above, another embodiment is proposed. Please refer to [link / reference]. Figure 5 and Figure 6 A low-pressure casting device for an impeller includes a heating assembly 402 comprising a U-shaped plate 4021, which is snapped onto the outer periphery of a jacket sleeve 401. A slot 4022 is fixedly provided on the inner side of the longitudinal section of the U-shaped plate 4021, and a heater body 4023 is arranged within the slot 4022. The heater body 4023 is selected and used by a technician in this field according to the actual situation. The slot 4022 and the heater body 4023 pass through a perforation 4011 opened on the outer periphery of the jacket sleeve 401, with the heater body 4023 extending into the inner cavity of the jacket sleeve 401. An electrical wire connected to the heater body 4023 passes through the perforation 4011 and extends out through the U-shaped plate 4021. The heat generated by energizing the heater body 4023 is transferred to the inner cavity of the jacket sleeve 401, and then transferred to the riser pipe 300 via a heat-conducting layer 4012.

[0035] A transverse section of the U-shaped plate 4021 is fixedly connected to the top of the interlayer sleeve 401 by bolts 4024. The bolts 4024 pass through the holes in the transverse section of the U-shaped plate 4021 and are connected to the screw holes at the top of the interlayer sleeve 401. The U-shaped plate 4021 is detachable from the interlayer sleeve 401. The slot 4022 and the heater body 4023 can be removed.

[0036] A retaining spring 4025 is provided at the bottom of the inner cavity of the slot 4022. The heater body 4023 is inserted into the inner cavity of the slot 4022, and the retaining spring 4025 abuts against the heater body 4023. The retaining spring 4025 is arc-shaped, and the arched section of the retaining spring 4025 contacts the outer shell of the heater body 4023. The heater body 4023 is fixed in the slot 4022 by abutting against the retaining spring 4025, and the heater body 4023 can be removed from the slot 4022.

[0037] This utility model, by setting up a U-shaped plate 4021, bolts 4024, a slot 4022 and abutment spring 4025, has the advantage of being able to disassemble and replace the damaged heater body 4023 separately, which is convenient for maintenance.

[0038] Working principle: During low-pressure casting of the impeller, the mold is placed and positioned on the machine platform. The mold cavity is connected to the gating system. Dry compressed air or inert gas is introduced into the holding furnace 200. The pressure acting on the surface of the molten metal causes the molten metal in the holding furnace 200 to smoothly fill the mold from bottom to top through the gating system via the riser pipe 300. The heat generated by the energized heater body 4023 is transferred to the inner cavity of the jacket sleeve 401, and then to the riser pipe 300 via the heat-conducting layer 4012. This heats the riser pipe 300, preventing it from absorbing excessive heat from the molten metal as it flows through, thus preventing the temperature of the molten metal from dropping too much. After the casting has completely solidified, the gas pressure on the surface of the liquid is released, allowing the unsolidified molten metal in the riser pipe 300 and the gating system to flow back into the holding furnace 200 by gravity. Then, the mold is opened and the casting is removed.

[0039] When replacing the damaged heater body 4023, loosen and remove the bolt 4024, remove the U-shaped plate 4021, the slot 4022 and the damaged heater body 4023 together, pull the new heater body 4023 out of the slot 4022, and then insert the new heater body 4023 into the slot 4022. The heater body 4023 is fixed in the slot 4022 by abutting against the abutting spring 4025. The wire connected to the heater body 4023 passes through the through hole 4011 and through the U-shaped plate 4021 to extend and connect to the power supply. The slot 4022 and the heater body 4023 pass through the through hole 4011 opened on the outer periphery of the interlayer sleeve 401. A transverse section of the U-shaped plate 4021 is fixedly connected to the top of the interlayer sleeve 401 by bolt 4024.

[0040] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A low-pressure casting device for impellers, characterized in that: Includes a frame (100), a heat preservation furnace (200) is provided at the bottom of the frame (100), a liquid riser (300) is provided at the top outlet of the heat preservation furnace (200), and a heat preservation structure (400) is arranged on the liquid riser (300); The insulation structure (400) includes a jacket (401) and a heating component (402). The jacket (401) is sleeved on the riser pipe (300), and the heating component (402) is arranged on the jacket (401).

2. The impeller low-pressure casting device according to claim 1, characterized in that: The inner wall of the jacket (401) is provided with a heat-conducting layer (4012), which is wavy.

3. The impeller low-pressure casting device according to claim 1, characterized in that: The heating assembly (402) includes a U-shaped plate (4021), which is snapped onto the outer periphery of the interlayer sleeve (401). A slot (4022) is provided on the inner side of the longitudinal section of the U-shaped plate (4021). A heater body (4023) is arranged in the slot (4022). The slot (4022) and the heater body (4023) pass through a perforation (4011) opened on the outer periphery of the interlayer sleeve (401), and the heater body (4023) extends into the inner cavity of the interlayer sleeve (401).

4. The impeller low-pressure casting device according to claim 3, characterized in that: The U-shaped plate (4021) segment is connected to the interlayer sleeve (401) by bolts (4024).

5. The impeller low-pressure casting device according to claim 3, characterized in that: The bottom of the inner cavity of the slot (4022) is provided with an abutment spring (4025), and the heater body (4023) is inserted into the inner cavity of the slot (4022). The abutment spring (4025) abuts and cooperates with the heater body (4023).

6. The impeller low-pressure casting device according to claim 5, characterized in that: The abutment spring (4025) is arc-shaped, and the arched section of the abutment spring (4025) contacts the outer shell of the heater body (4023).

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