High-vacuum filtering device for vacuum induction melting furnace

Abstract

The utility model relates to the field of metal smelting, and discloses a high-vacuum filtering device for a vacuum induction melting furnace, which can better filter small-particle splashing and dust without increasing pipe resistance during high-vacuum pumping. The device comprises a high-vacuum pipeline, a filter screen and a rotating shaft. The first end of the high-vacuum pipeline is connected to the vacuum induction melting furnace, and the second end of the high-vacuum pipeline is connected to a vacuum pump. The filter screen is arranged in the pipeline, the edge of the filter screen is matched with the inner wall of the high-vacuum pipeline in shape, the filter screen is configured to prevent dust from flying into the high-vacuum pipeline, and the rotating shaft penetrates through the high-vacuum pipeline from top to bottom and is detachably connected with the filter screen. The rotating shaft is configured to enable the filter screen to rotate between a first position and a second position. Wherein the first position is that the filter screen is perpendicular to the inner wall of the high-vacuum pipeline, and the second position is that the filter screen is parallel to the axis of the high-vacuum pipeline.

Description

Technical Field

[0001] The present application relates to the field of metal smelting, and in particular to a high vacuum filtering device for a vacuum induction melting furnace. Background Art

[0002] Vacuum Induction Melting (VIM) furnace is a widely used equipment in the field of metal processing and alloy preparation. It is mainly used to melt metal in a high vacuum or inert gas protection environment. This technology uses the principle of electromagnetic induction to melt metal quickly without direct contact heating, thereby reducing metal oxidation and impurities, and improving the purity and performance of the final product.

[0003] During the VIM operation, the system needs to go through two stages: low vacuum and high vacuum. In the initial stage, low vacuum is used to remove surface gas and moisture from metals and other materials. At this time, due to the smelting process, inert gas will be blown into the vacuum chamber, and the high temperature and rapid gas flow will cause a large amount of dust and splashes. If these dust and splashes are not effectively controlled, they will enter the subsequent high vacuum stage, causing contamination and damage to high vacuum pipelines and equipment such as flapper valves and oil booster pumps. The flapper valve will need to be cleaned of dust frequently, and the oil in the oil booster pump will be contaminated, thereby reducing the service life and efficiency of the equipment.

[0004] In the prior art, a single-layer large mesh plate is usually set in front of the high vacuum pipe to intercept larger particles, but this method has limited filtering effect on tiny dust and cannot completely solve the problem. If it is replaced with a fine-mesh filter, although it can filter fine dust, the too small mesh will significantly reduce the high vacuum extraction efficiency, which is unacceptable in actual operation. Summary of the invention

[0005] The purpose of the present application is to provide a high vacuum filtering device for a vacuum induction melting furnace, which can better filter small particle splashes and dust without increasing the pipe resistance when pumping high vacuum.

[0006] The present application discloses a high vacuum filtering device for a vacuum induction melting furnace, comprising: a high vacuum pipeline 1, a filter screen 2, and a rotating shaft 3;

[0007] The first end of the high vacuum pipeline 1 is connected to the vacuum chamber, and the second end of the high vacuum pipeline 1 is connected to the baffle valve;

[0008] The filter screen 2 is arranged in the pipeline, the edge of the filter screen 2 matches the shape of the inner wall of the high vacuum pipeline 1, and the filter screen 2 is configured to prevent dust from floating into the high vacuum pipeline 1. The rotating shaft 3 penetrates the high vacuum pipeline 1 from top to bottom and is detachably connected to the filter screen 2. The rotating shaft 3 is configured to rotate the filter screen 2 between a first position and a second position;

[0009] Wherein, the first position is that the filter screen 2 is perpendicular to the inner wall of the high vacuum pipe 1 , and the second position is that the filter screen 2 is parallel to the axis of the high vacuum pipe 1 .

[0010] In a preferred example, a limit baffle 4 is protruded on the inner wall of the high vacuum pipe 1, and when the filter screen 2 is in the first position, the outer surface of the filter screen 2 is against the outer wall of the limit baffle 4, and the limit baffle 4 is configured to reduce the gap between the filter screen 2 and the inner wall of the high vacuum pipe 1 when the filter screen 2 is in the first position, and to limit the rotation position of the filter screen 2.

[0011] In a preferred example, when the vacuum induction melting furnace is evacuated to a low vacuum, the rotating shaft 3 rotates the filter screen 2 to a first position, and when the vacuum induction melting furnace is evacuated to a high vacuum, the rotating shaft 3 rotates the filter screen 2 to a second position.

[0012] In a preferred example, a plurality of fixing holes are opened on the rotating shaft 3 from top to bottom, and a fixing hole corresponding to the position of the fixing hole on the rotating shaft 3 is opened on one side of the filter screen 2, and a bolt 5 is inserted into the fixing hole to fix the rotating shaft 3 and the filter screen 2 in connection.

[0013] In a preferred example, the filter screen 2 includes multiple layers of small-pore filter screens and a skeleton 6 , and the skeleton 6 is configured to support the filter screen 2 .

[0014] In a preferred example, an actuator 7 is further included. The actuator 7 is connected to the first end of the rotating shaft 3 , and the actuator 7 is configured to drive the rotating shaft 3 to rotate.

[0015] In a preferred example, it also includes a connecting flange 8 and a screw 9, wherein a through hole is provided at the axis center of the connecting flange 8 for allowing the first end of the rotating shaft 3 to pass through the connecting flange 8, and the connecting flange 8 is installed on the outer wall of the high vacuum pipe 1, and a screw hole is provided on the side wall of the connecting flange 8, and an annular fixing groove is provided on the side wall of the first end of the rotating shaft 3, and the position of the annular fixing groove corresponds to the position of the screw hole, and the screw 9 extends into the annular fixing groove through the screw hole, and the screw 9 is configured to prevent the rotating shaft 3 from moving in the vertical direction.

[0016] In a preferred example, the limit baffle 4 is symmetrically distributed on the inner wall of the high vacuum pipe 1 with the rotating shaft 3 as the axis, the limit baffle 4 located on the left side of the rotating shaft 3 is against the front outer surface of the filter 2, and the limit baffle 4 located on the right side of the rotating shaft 3 is against the back outer surface of the filter 2.

[0017] In a preferred example, a sealing structure is provided between the rotating shaft 3 and the inner wall of the connecting flange 8 .

[0018] In a preferred example, it also includes an end head 10, which is connected to the second end of the rotating shaft 3, and is installed on the outer wall of the high vacuum pipe 1, and is configured to limit the movable position of the second section of the rotating shaft 3.

[0019] In the implementation mode of the present application, a rotatable filter is arranged in the high vacuum pipe, and the filter rotates between a first position (perpendicular to the inner wall of the pipe) and a second position (parallel to the axis of the pipe). In the low vacuum stage, the filter is rotated to the first position, and the multi-layer small-pore filter it carries can filter out a large amount of dust and other impurities, effectively preventing these particles from entering the high vacuum pipe, thereby preventing the particles from entering the baffle valve and the oil booster pump, which can enhance the life of the baffle valve and the oil booster pump and ensure the cleanliness of the oil in the oil booster pump; when entering the high vacuum stage, the filter rotates from the first position perpendicular to the inner wall of the high vacuum pipe to the second position parallel to the axis of the pipe. At this time, the resistance to high vacuum drawing will not be increased, the air extraction efficiency is optimized, and at the same time, the necessary filtering effect is still provided to protect the vacuum pump and other key components.

[0020] Furthermore, by configuring a limit baffle on the inner wall of the high vacuum pipe, the stability of the filter at different positions can be accurately controlled, while reducing the gap between the filter and the inner wall of the pipe, optimizing the filtration efficiency, ensuring that the filter can effectively block dust and splashes in low vacuum, and protecting the subsequent high vacuum stage from contamination;

[0021] Furthermore, the filter screen and the rotating shaft are connected by bolts, which can facilitate the maintenance or replacement of the filter screen.

[0022] A large number of technical features are recorded in the specification of this application, which are distributed in various technical solutions. If all possible combinations of technical features of this application (i.e., technical solutions) are to be listed, the specification will be too long. In order to avoid this problem, the various technical features disclosed in the above-mentioned invention content of this application, the various technical features disclosed in the various embodiments and examples below, and the various technical features disclosed in the accompanying drawings can be freely combined with each other to form various new technical solutions (these technical solutions are all deemed to have been recorded in this specification), unless the combination of such technical features is technically infeasible. For example, in one example, feature A+B+C is disclosed, and in another example, feature A+B+D+E is disclosed, and features C and D are equivalent technical means that play the same role. Technically, only one can be used, and it is impossible to use them at the same time. Feature E can be combined with feature C technically. Then, the solution of A+B+C+D should not be deemed to have been recorded because it is technically infeasible, and the solution of A+B+C+E should be deemed to have been recorded. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of a high vacuum filtration device for a vacuum induction melting furnace according to one embodiment of the present application;

[0024] Figure 2 is a schematic structural diagram of a high vacuum filtration device for a vacuum induction melting furnace according to one embodiment of the present application;

[0025] Figure 3 It is a partially enlarged view of a high vacuum filtration device for a vacuum induction melting furnace according to one embodiment of the present application.

[0026] Description of reference numerals:

[0027] 1-high vacuum pipe, 2-filter, 3-rotating shaft, 4-limit baffle, 5-bolt, 6-skeleton, 7-actuator, 8-connecting flange, 9-screw, 10-terminal. DETAILED DESCRIPTION

[0028] In the following description, many technical details are provided to help readers better understand the present application. However, those skilled in the art can understand that the technical solution claimed in the present application can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0029] the term

[0030] In the present application, "outer wall" refers to the outermost structure of the high vacuum pipe 1, actuator 7, connecting flange 8 or other related equipment, which forms the external interface of the equipment and is in direct contact with the external environment.

[0031] In this application, "inner wall" refers to the inner surface of a high vacuum pipe 1, container or equipment. This inner surface is in direct contact with or adjacent to the material or fluid processed during the operation of the equipment. For example, in a vacuum system, the inner wall is the surface that is in direct contact with the vacuum environment inside the system.

[0032] In this application, "upper" and "lower" are used to describe the relative position of a component or assembly in a device shown in the figure. "Up" usually refers to the top of a component in a drawing or the part facing upwards in the drawing, while "lower" refers to the bottom of a component in a drawing or the part facing downwards in the drawing. It should be noted that this definition is made for the convenience of description based on the perspective and layout of the drawings. This usage is only for the purpose of explaining and illustrating the layout and operational relationship of the components in the illustrated examples, and is not intended to limit the installation or use direction of the actual device. In actual applications, the concepts of "upper" and "lower" may vary depending on the installation location, use environment, or operational requirements of the device.

[0033] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0034] The present application relates to a high vacuum filtration device for a vacuum induction melting furnace, and its structure diagram is as follows Figure 1-3 As shown, it includes: a high vacuum pipeline 1, a filter screen 2, and a rotating shaft 3.

[0035] The first end of the high vacuum pipe 1 is connected to the vacuum chamber, and the second end of the high vacuum pipe 1 is connected to the baffle valve. The filter screen 2 is arranged in the pipe, and the edge of the filter screen 2 matches the shape of the inner wall of the high vacuum pipe 1. The filter screen 2 is configured to prevent dust from floating into the high vacuum pipe 1. The rotating shaft 3 passes through the high vacuum pipe 1 from top to bottom and is detachably connected to the filter screen 2. The rotating shaft 3 is configured to rotate the filter screen 2 between a first position and a second position, wherein the first position is that the filter screen 2 is perpendicular to the inner wall of the high vacuum pipe 1, and the second position is that the filter screen 2 is parallel to the axis of the high vacuum pipe 1.

[0036] In an optional embodiment, the first end of the flapper valve is connected to the second end of the high vacuum pipeline 1, and the second end of the flapper valve is connected to the oil booster pump (high vacuum pump).

[0037] In an optional embodiment, the filter screen 2 is arranged on a side close to the vacuum chamber.

[0038] In an optional embodiment, a limit baffle 4 is protruded on the inner wall of the high vacuum pipe 1. When the filter screen 2 is in the first position, the outer surface of the filter screen 2 is against the outer wall of the limit baffle 4. The limit baffle 4 is configured to reduce the gap between the filter screen 2 and the inner wall of the high vacuum pipe 1 when the filter screen 2 is in the first position, and to limit the rotation position of the filter screen 2.

[0039] In an optional embodiment, when the vacuum induction melting furnace is evacuated to a low vacuum, the rotating shaft 3 rotates the filter screen 2 to a first position, and when the vacuum induction melting furnace is evacuated to a high vacuum, the rotating shaft 3 rotates the filter screen 2 to a second position.

[0040] In an optional embodiment, a plurality of fixing holes are opened on the rotating shaft 3 from top to bottom, and a fixing hole corresponding to the position of the fixing hole on the rotating shaft 3 is opened on one side of the filter screen 2, and the bolt 5 extends into the fixing hole to fix the rotating shaft 3 and the filter screen 2 in connection.

[0041] In an optional embodiment, the filter screen 2 includes multiple layers of small-pore filter screens and a skeleton 6 , and the skeleton 6 is configured to support the filter screen 2 .

[0042] In an optional embodiment, an actuator 7 is further included. The actuator 7 is connected to the first end of the rotating shaft 3 , and the actuator 7 is configured to drive the rotating shaft 3 to rotate.

[0043] In an optional embodiment, it also includes a connecting flange 8 and a screw 9. A through hole is provided at the axis center of the connecting flange 8, so that the first end of the rotating shaft 3 passes through the connecting flange 8. The connecting flange 8 is installed on the outer wall of the high vacuum pipe 1. A screw hole is provided on the side wall of the connecting flange 8. An annular fixing groove is provided on the side wall of the first end of the rotating shaft 3. The position of the annular fixing groove corresponds to the position of the screw hole. The screw 9 extends into the annular fixing groove through the screw hole. The screw 9 is configured to prevent the rotating shaft 3 from moving in the vertical direction.

[0044] In an optional embodiment, the limit baffle 4 is symmetrically distributed on the inner wall of the high vacuum pipe 1 with the rotating axis 3 as the axis center, the limit baffle 4 located on the left side of the rotating axis 3 is against the front outer surface of the filter 2, and the limit baffle 4 located on the right side of the rotating axis 3 is against the back outer surface of the filter 2.

[0045] In an optional embodiment, if Figure 3 As shown, a sealing structure is provided between the rotating shaft 3 and the inner wall of the connecting flange 8. Optionally, the sealing structure may include a lip seal ring, a spacer and a hole card, and the lip seal ring may include two, the rotating shaft 3 passes through the through hole in the middle of the lip seal ring, a spacer is provided between the two lip seal rings, and a hole card is provided at the upper end of the upper lip seal ring, and the hole card is used to limit the lip seal ring so that it does not move in the vertical direction.

[0046] In an optional embodiment, it further includes an end head 10, which is connected to the second end of the rotating shaft 3, and is installed on the outer wall of the high vacuum pipe 1, and is configured to limit the movable position of the second section of the rotating shaft 3.

[0047] In order to better understand the technical solution of the present application, a specific example is provided below for illustration. The details listed in the example are mainly for ease of understanding and are not intended to limit the scope of protection of the present application.

[0048] Example

[0049] In the low vacuum stage, the actuator 7 is activated to drive the rotating shaft 3, so that the filter 2 rotates to a position perpendicular to the high vacuum pipe 1. At this time, the multi-layer holes of the filter 2 can effectively capture dust and splashes, preventing these impurities from further entering the high vacuum pipe 1. This position is precisely controlled by the limit baffle 4 to ensure that the gap between the filter 2 and the inner wall of the high vacuum pipe 1 is minimized, thereby improving the filtering efficiency.

[0050] As the process switches to the high vacuum stage, actuator 7 is activated again and adjusts the rotating shaft 3 so that the filter screen is parallel to the pipeline axis. In this configuration, the filter screen offers minimal resistance to air flow, allowing efficient vacuum extraction.

[0051] In order to facilitate maintenance and replacement of the filter screen, the present application has designed a simple replacement mechanism. When the filter screen 2 needs to be replaced, it only needs to be turned to a position parallel to the axis of the high vacuum pipe 1, and then the bolt 5 is removed by rotating to separate the filter screen 2 from the rotating shaft 3, and the filter screen 2 can be taken out.

[0052] The high vacuum filtration device of the present application effectively improves the operating efficiency of the vacuum induction smelting process, can better filter small particle splashes and dust, protect and increase the service life of equipment such as baffle valves and oil increase pumps, and at the same time simplifies the maintenance procedures, ensuring the long-term stable operation of the system and high-quality metal smelting results.

[0053] It should be noted that in the application documents of this patent, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one" do not exclude the existence of other identical elements in the process, method, article or device including the elements. In the application documents of this patent, if it is mentioned that an action is performed according to an element, it means that the action is performed at least according to the element, which includes two situations: performing the action only according to the element, and performing the action according to the element and other elements. Expressions such as multiple, multiple, and multiple include 2, 2 times, 2 kinds, and more than 2, more than 2 times, and more than 2 kinds.

[0054] All documents mentioned in this application are considered to be included in the disclosure of this application as a whole, so that they can be used as the basis for modification when necessary. In addition, it should be understood that after reading the above disclosure of this application, those skilled in the art can make various changes or modifications to this application, and these equivalent forms also fall within the scope of protection claimed in this application.

Claims

1. A high vacuum filtration device for a vacuum induction melting furnace, characterized in that: include: High vacuum pipe (1), filter (2), rotating shaft (3); A first end of the high vacuum pipeline (1) is connected to the vacuum chamber, and a second end of the high vacuum pipeline (1) is connected to the baffle valve; The filter screen (2) is arranged in the pipeline, the edge of the filter screen (2) matches the shape of the inner wall of the high vacuum pipeline (1), the filter screen (2) is configured to prevent dust from floating into the high vacuum pipeline (1), the rotating shaft (3) penetrates the high vacuum pipeline (1) from top to bottom and is detachably connected to the filter screen (2), and the rotating shaft (3) is configured to rotate the filter screen (2) between a first position and a second position; Wherein, the first position is that the filter screen (2) is perpendicular to the inner wall of the high vacuum pipe (1), and the second position is that the filter screen (2) is parallel to the axis of the high vacuum pipe (1).

2. The high vacuum filtration device for a vacuum induction melting furnace according to claim 1, characterized in that: A limit baffle (4) is protruded on the inner wall of the high vacuum pipe (1); when the filter screen (2) is in the first position, the outer surface of the filter screen (2) abuts against the outer wall of the limit baffle (4); the limit baffle (4) is configured to reduce the gap between the filter screen (2) and the inner wall of the high vacuum pipe (1) when the filter screen (2) is in the first position, and to limit the rotation position of the filter screen (2).

3. The high vacuum filtration device for a vacuum induction melting furnace according to claim 1, characterized in that: When the vacuum induction melting furnace is evacuated to a low vacuum, the rotating shaft (3) causes the filter screen (2) to rotate to a first position; and when the vacuum induction melting furnace is evacuated to a high vacuum, the rotating shaft (3) causes the filter screen (2) to rotate to a second position.

4. The high vacuum filtration device for a vacuum induction melting furnace according to claim 1, characterized in that: The rotating shaft (3) is provided with a plurality of fixing holes from top to bottom, and one side of the filter screen (2) is provided with a fixing hole corresponding to the position of the fixing hole on the rotating shaft (3), and a bolt (5) is inserted into the fixing hole to fix the rotating shaft (3) and the filter screen (2) in connection.

5. The high vacuum filtration device for a vacuum induction melting furnace according to claim 1, characterized in that: The filter screen (2) comprises multiple layers of small-pore filter screens and a skeleton (6), and the skeleton (6) is configured to support the filter screen (2).

6. The high vacuum filtration device for a vacuum induction melting furnace according to claim 1, characterized in that: It also includes an actuator (7), which is connected to the first end of the rotating shaft (3) and is configured to drive the rotating shaft (3) to rotate.

7. The high vacuum filtration device for a vacuum induction melting furnace according to claim 1, characterized in that: It also includes a connecting flange (8) and a screw (9), wherein a through hole is provided at the axis center of the connecting flange (8) for allowing the first end of the rotating shaft (3) to pass through the connecting flange (8), and the connecting flange (8) is installed on the outer wall of the high vacuum pipe (1), and a screw hole is provided on the side wall of the connecting flange (8). An annular fixing groove is provided on the side wall of the first end of the rotating shaft (3), and the position of the annular fixing groove corresponds to the position of the screw hole. The screw (9) extends into the annular fixing groove through the screw hole, and the screw (9) is configured to prevent the rotating shaft (3) from moving in the vertical direction.

8. The high vacuum filtration device for a vacuum induction melting furnace according to claim 2, characterized in that: The limit baffles (4) are symmetrically distributed on the inner wall of the high vacuum pipe (1) with the rotation axis (3) as the axis center; the limit baffle (4) located on the left side of the rotation axis (3) abuts against the front outer surface of the filter screen (2), and the limit baffle (4) located on the right side of the rotation axis (3) abuts against the back outer surface of the filter screen (2).

9. The high vacuum filtration device for a vacuum induction melting furnace according to claim 7, characterized in that: A sealing structure is provided between the rotating shaft (3) and the inner wall of the connecting flange (8).

10. The high vacuum filtration device for a vacuum induction melting furnace according to claim 1, characterized in that: It also includes an end head (10), which is connected to the second end of the rotating shaft (3), and the end head (10) is installed on the outer wall of the high vacuum pipe (1), and the end head (10) is configured to limit the movable position of the second section of the rotating shaft (3).

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