Low-pressure casting holding furnace

Abstract

The utility model relates to the technical field of low-pressure casting, in particular to a low-pressure casting heat preservation furnace which comprises a heat preservation shell, an outer crucible and an inner crucible, the outer crucible is arranged in an inner cavity of the heat preservation shell, the inner crucible is arranged in an inner cavity of the outer crucible, and a high-pressure air inlet pipe is arranged on the side wall of the outer crucible. A through hole is formed in the outer crucible, a high-pressure air inlet pipe is arranged in the outer crucible, the high-pressure air inlet pipe penetrates through the through hole and extends to the outside of the heat preservation shell, a low-pressure air inlet pipe is arranged on the outer wall of the inner crucible, a liquid rising pipe is arranged in the middle of the inner crucible, and a one-way valve is arranged at the bottom of the inner crucible. And in addition, molten metal can be supplemented to the inner crucible, and compared with the prior art, the frequency of adding the liquid metal into the inner crucible can be reduced, so that the casting efficiency is improved.

Description

Technical Field

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

[0002] Low-pressure casting refers to a casting method where the mold is typically placed above a sealed crucible, and compressed air is introduced into the crucible to create low pressure (0.06–0.15 MPa) on the surface of the molten metal. This pressure causes the molten metal to rise through riser pipes to fill the mold and control solidification. This casting method offers good feeding, resulting in dense castings. It is easy to cast large, thin-walled, and complex castings, eliminates the need for risers, and achieves a metal yield of up to 95%. It is pollution-free and easily automated. However, the equipment cost is high, and the production efficiency is relatively low. It is generally used for casting non-ferrous alloys.

[0003] The existing low-pressure casting holding furnace has poor heat preservation effect, which will cause temperature fluctuations in the liquid metal and thus affect the casting quality. To address this problem, a low-pressure casting holding furnace is proposed. Utility Model Content

[0004] The purpose of this section is to outline some aspects of the embodiments of this utility model and to briefly introduce some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be used to limit the scope of this utility model.

[0005] In view of the problems existing in the current low-pressure casting holding furnace, this utility model is proposed.

[0006] Therefore, the purpose of this utility model is to provide a low-pressure casting holding furnace. By storing liquid metal in the outer crucible, the inner crucible can be kept warm while the inner crucible can be replenished with molten metal. Compared with the prior art, this can reduce the frequency of adding liquid metal to the inner crucible, thereby improving the casting efficiency.

[0007] To solve the above-mentioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0008] A low-pressure casting holding furnace includes a heat-insulating outer shell, an outer crucible, and an inner crucible;

[0009] The inner cavity of the insulation shell is provided with an outer crucible, and the inner cavity of the outer crucible is provided with an inner crucible. A high-pressure air inlet pipe is provided on the side wall of the outer crucible, and the high-pressure air inlet pipe extends through the through hole to the outside of the insulation shell. A low-pressure air inlet pipe is provided on the outer wall of the inner crucible. A liquid riser pipe is provided in the middle of the inner crucible, and a one-way valve is provided at the bottom of the inner crucible.

[0010] In a preferred embodiment of the low-pressure casting holding furnace described in this utility model, the heat-insulating shell and the outer crucible are sealed together by a sealing cover, and the space between the heat-insulating shell and the outer crucible is a vacuum.

[0011] In a preferred embodiment of the low-pressure casting holding furnace described in this utility model, the inner crucible and the outer crucible are sealed together by a sealing cover, and there is liquid metal between the inner crucible and the outer crucible.

[0012] In a preferred embodiment of the low-pressure casting holding furnace described in this utility model, the low-pressure air inlet pipe extends through the outer crucible and through the through hole to the outside of the holding shell.

[0013] As a preferred embodiment of the low-pressure casting holding furnace described in this utility model, the one-way valve is provided in multiple ways, which are evenly distributed at the bottom of the inner crucible, and the one-way valve includes a valve body, and a valve disc is rotatably connected inside the valve body.

[0014] In a preferred embodiment of the low-pressure casting holding furnace described in this utility model, the liquid inlet direction of the one-way valve is located on the side of the outer crucible, and the liquid outlet direction is located on the side of the inner crucible.

[0015] Compared with the prior art, the beneficial effects of this utility model are: by storing liquid metal in the outer crucible, the inner crucible can be kept warm and replenished with liquid metal at the same time. Compared with the prior art, the frequency of adding liquid metal to the inner crucible can be reduced, thereby improving the casting efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

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

[0018] Figure 2 This is a three-dimensional structural diagram of the thermal insulation shell of this utility model;

[0019] Figure 3 This is a schematic diagram of the outer crucible structure of this utility model;

[0020] Figure 4 This is a schematic cross-sectional view of the overall structure of this utility model;

[0021] Figure 5This is a three-dimensional structural diagram of the one-way valve of this utility model.

[0022] In the diagram: 100 Insulation shell, 110 Through hole, 200 Outer crucible, 210 High-pressure air inlet pipe, 300 Inner crucible, 310 Low-pressure air inlet pipe, 320 Liquid riser pipe, 330 One-way valve, 331 Valve body, 332 Valve disc. Detailed Implementation

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views showing the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, in actual manufacturing, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0027] This utility model provides the following technical solution: a low-pressure casting holding furnace, in which liquid metal is stored in the outer crucible during use, the inner crucible can be kept warm at the same time, and the inner crucible can be replenished with liquid metal. Compared with the prior art, the frequency of adding liquid metal to the inner crucible can be reduced, thereby improving the casting efficiency.

[0028] Figures 1-5 The diagram shown is a structural schematic of the first embodiment of a low-pressure casting holding furnace according to this utility model. Please refer to [link / reference]. Figures 1-5 The low-pressure casting holding furnace of this embodiment includes a main body comprising a heat-insulating shell 100, an outer crucible 200, and an inner crucible 300.

[0029] An outer crucible 200 is provided inside the inner cavity of the heat-insulating shell 100, and an inner crucible 300 is provided inside the inner cavity of the outer crucible 200. A high-pressure air inlet pipe 210 is provided on the side wall of the outer crucible 200. The high-pressure air inlet pipe 210 extends through the through hole 110 to the outside of the heat-insulating shell 100. A low-pressure air inlet pipe 310 is provided on the outer wall of the inner crucible 300. A liquid riser pipe 320 is provided in the middle of the inner crucible 300. A one-way valve 330 is provided at the bottom of the inner crucible 300.

[0030] The heat insulation shell 100 and the outer crucible 200 are sealed together by a sealing cap, and there is a vacuum between the heat insulation shell 100 and the outer crucible 200. The inner crucible 300 and the outer crucible 200 are sealed together by a sealing cap. There is liquid metal between the inner crucible 300 and the outer crucible 200. The low-pressure air inlet pipe 310 passes through the outer crucible 200 and the through hole 110 and extends to the outside of the heat insulation shell 100. Multiple one-way valves 330 are provided and are evenly distributed at the bottom of the inner crucible 300. The one-way valve 330 includes a valve body 331 and a valve disc 332 is rotatably connected inside the valve body 331. The liquid inlet direction of the one-way valve 330 is located on one side of the outer crucible 200, and the liquid outlet direction is located on one side of the inner crucible 300.

[0031] The insulating outer shell 100 is used to insulate the outer crucible 200. A vacuum exists between the insulating outer shell 100 and the outer crucible 200, thereby reducing temperature transfer and achieving the insulation effect. The outer crucible 200 is used to hold the liquid metal added to the inner crucible 300. The high-pressure gas inlet pipe 210 is used to inject gas at a pressure higher than that of the inner crucible 300 into the outer crucible 200, enabling the liquid metal in the outer crucible 200 to be transported to the inner crucible 300 via the one-way valve 330. This is used to carry the low-pressure air inlet pipe 310, the riser pipe 320, the one-way valve 330, and the liquid metal for casting. The low-pressure air inlet pipe 310 is used to inject low-pressure air into the inner crucible 300, so that the liquid metal enters the casting mold through the riser pipe 320. The one-way valve 330 is used to transport the liquid metal to the inner crucible 300 when the pressure in the outer crucible 200 is greater than that in the inner crucible 300. This can reduce the frequency of adding liquid metal to the inner crucible 300, thereby improving the casting efficiency.

[0032] By storing liquid metal in the outer crucible 200, the inner crucible 300 can be kept warm while the inner crucible 300 can be replenished with liquid metal. Compared with the existing technology, the frequency of adding liquid metal to the inner crucible 300 can be reduced, thereby improving the casting efficiency.

[0033] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A low-pressure casting holding furnace, characterized in that: It includes an insulating outer shell, an outer crucible (200), and an inner crucible (300); An outer crucible (200) is provided in the inner cavity of the heat-insulating shell, and an inner crucible (300) is provided in the inner cavity of the outer crucible (200). A high-pressure air inlet pipe (210) is provided on the side wall of the outer crucible (200), and the high-pressure air inlet pipe (210) extends through the through hole (110) to the outside of the heat-insulating shell. A low-pressure air inlet pipe (310) is provided on the outer wall of the inner crucible (300). A liquid riser pipe (320) is provided in the middle of the inner crucible (300), and a one-way valve (330) is provided at the bottom of the inner crucible (300).

2. The low-pressure casting holding furnace according to claim 1, characterized in that: The heat-insulating outer shell and the outer crucible (200) are sealed together by a sealing cap, and there is a vacuum between the heat-insulating outer shell and the outer crucible (200).

3. The low-pressure casting holding furnace according to claim 1, characterized in that: The inner crucible (300) and the outer crucible (200) are sealed together by a sealing cap, and there is liquid metal between the inner crucible (300) and the outer crucible (200).

4. A low-pressure casting holding furnace according to claim 1, characterized in that: The low-pressure air inlet pipe (310) extends through the outer crucible (200) and the through hole (110) to the outside of the insulation shell.

5. A low-pressure casting holding furnace according to claim 1, characterized in that: Multiple one-way valves (330) are provided and are evenly distributed at the bottom of the inner crucible (300). Each one-way valve (330) includes a valve body (331) and a valve disc (332) is rotatably connected inside the valve body (331).

6. A low-pressure casting holding furnace according to claim 1, characterized in that: The one-way valve (330) has its liquid inlet direction on one side of the outer crucible (200) and its liquid outlet direction on one side of the inner crucible (300).

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