Vacuum filtration structure and vacuum die casting machine

Abstract

This disclosure provides a vacuum filtration structure and a vacuum die-casting machine. The vacuum filtration structure includes a vacuum valve, a vacuum valve connector, and a filter assembly connected in series. One end of the vacuum valve connector is fixed to the exhaust port of the vacuum die-casting machine and communicates with the exhaust port. The vacuum valve is installed at the other end of the vacuum valve connector. The filter assembly is installed and fixed between the vacuum valve and the vacuum valve connector. The filter assembly includes an aluminum melt barrier, which blocks the aluminum melt. The aluminum melt barrier has a plurality of first filter holes, each with a pore size of 30μm-100μm. This vacuum filtration structure not only reduces the maintenance cost of the vacuum die-casting machine but also improves its production efficiency.

Description

Technical Field

[0001] This disclosure relates to the technical field of die casting, and in particular to a vacuum filtration structure and a vacuum die casting machine. Background Technology

[0002] Vacuum valves play a crucial role in regulating and controlling the vacuum level in vacuum die-casting machines. However, during die-casting, fluctuations in process control (such as pressure imbalance or valve response delay) or pipeline seal failure can allow high-temperature molten aluminum to flow backwards into the vacuum pipeline through the vacuum valve joint, or even directly into the vacuum machine. This can damage the entire vacuum equipment, disrupting continuous production and requiring frequent shutdowns to clean residual aluminum slag from the pipelines. This significantly increases maintenance costs and reduces production efficiency. To address these issues, some manufacturers have conducted further research and development.

[0003] For example, patent CN207057593U proposes a vacuum transition device, which includes a fixed mold insert, a moving mold insert, and an exhaust pipe for a vacuum mold. An exhaust module is provided between the exhaust pipe and the vacuum mold. The exhaust module includes a fixed mold exhaust block connected to the fixed mold insert and a moving mold exhaust block connected to the moving mold insert. The exhaust pipe is located at the upper end of the mold exhaust module and is directly connected to the fixed mold exhaust block. A corrugated overflow channel is provided between the fixed mold exhaust block and the moving mold exhaust block. An upper flange and a lower flange are provided on the exhaust pipe, and a filter screen is provided between the upper flange and the lower flange. This device effectively prevents molten aluminum from entering the exhaust valve during the die casting process by installing the filter screen between the vacuum mold and the vacuum valve, in conjunction with the corrugated overflow channel design of the exhaust module. This design makes the device simple in structure, easy to process and manufacture, and the vacuum transition device is convenient and simple to disassemble, clean, and install.

[0004] However, when the aperture of the through holes on the filter screen is too large, high-temperature molten aluminum may still pass through the filter screen and enter the vacuum valve, or even the vacuum pump. This greatly increases the likelihood of damage to the vacuum die-casting machine, requiring frequent shutdowns to clean the vacuum valve and vacuum pump of residual aluminum slag. This not only significantly increases the maintenance cost of the vacuum die-casting machine but also greatly reduces its production efficiency. Conversely, when the aperture of the through holes on the filter screen is too small, impurities and particles in the high-temperature molten aluminum can easily clog the through holes, greatly reducing the gas flow efficiency of the filter screen and consequently reducing the exhaust efficiency of the vacuum die-casting machine, thus significantly lowering its production efficiency. Utility Model Content

[0005] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a vacuum filtration structure and vacuum die-casting machine that can not only reduce maintenance costs but also improve production efficiency.

[0006] The purpose of this disclosure is achieved through the following technical solution:

[0007] A vacuum filter structure includes a vacuum valve, a vacuum valve connector, and a filter assembly connected in series; one end of the vacuum valve connector is used to be installed and fixed at the exhaust port of a vacuum die-casting machine, and the vacuum valve connector is used to communicate with the exhaust port of the vacuum die-casting machine, and the vacuum valve is installed at the other end of the vacuum valve connector.

[0008] The filter assembly is installed and fixed between the vacuum valve and the vacuum valve connector. The filter assembly includes an aluminum liquid barrier, which is used to block the aluminum liquid. The aluminum liquid barrier has a plurality of first filter holes, and the diameter of each first filter hole is 30μm-100μm.

[0009] In one embodiment, the filtration assembly further includes a first buffer filter element disposed between the vacuum valve connector and the molten aluminum barrier element, the first buffer filter element being used to slow down the flow rate of the molten aluminum.

[0010] In one embodiment, the first buffer filter is formed with a plurality of second filter holes, the sum of the cross-sectional areas of all the second filter holes being greater than or equal to the sum of the cross-sectional areas of all the first filter holes.

[0011] In one embodiment, the filtration assembly further includes a second buffer filter element disposed between the vacuum valve connector and the first buffer filter element, the second buffer filter element being used to slow down the flow rate of the molten aluminum.

[0012] In one embodiment, the second buffer filter is formed with a plurality of third filter holes, the sum of the cross-sectional areas of all the third filter holes being greater than or equal to the sum of the cross-sectional areas of all the first filter holes.

[0013] In one embodiment, the pore size of each of the second filter pores is 30μm-100μm.

[0014] In one embodiment, the diameter of each of the third filter holes is 0.5 mm to 1 mm.

[0015] In one embodiment, the first buffer filter is a ceramic fiber layer.

[0016] In one embodiment, the thickness of the first buffer filter element is 2mm-3mm.

[0017] In one embodiment, the aluminum liquid barrier is a sintered metal filter element.

[0018] In one embodiment, the second buffer filter is a stainless steel support mesh.

[0019] In one embodiment, the second buffer filter is a corrugated three-dimensional woven structure.

[0020] In one embodiment, the vacuum valve connector has a communicating hole and a mounting hole, the mounting hole being connected to the exhaust hole of the vacuum die-casting machine via the communicating hole, and the vacuum valve being screwed into the mounting hole.

[0021] In one embodiment, the inner peripheral wall of the mounting hole is formed with a first threaded connection portion, and the outer peripheral wall of the vacuum valve is formed with a second threaded connection portion, wherein the first threaded connection portion is threadedly connected to the second threaded connection portion.

[0022] In one embodiment, the vacuum filter structure includes a first fastener and a second fastener. The diameter of the connecting hole is smaller than the diameter of the mounting hole, so that a stepped layer is formed at the connection between the connecting hole and the mounting hole. The second buffer filter is disposed in the mounting hole. The first fastener and the second fastener are both screwed into the mounting hole. The two sides of the second buffer filter abut against and limit the stepped layer and the first fastener, respectively, so that the second buffer filter is fixed in the mounting hole. The first buffer filter is disposed in the mounting hole. The two sides of the first buffer filter abut against and limit the first fastener and the second fastener, respectively, so that the first buffer filter is fixed in the mounting hole. The molten aluminum barrier is disposed in the mounting hole. The two sides of the molten aluminum barrier abut against and limit the second fastener and the vacuum valve, respectively, so that the molten aluminum barrier is fixed in the mounting hole.

[0023] In one embodiment, the cross-sectional areas of both the first and second buffer filters are larger than the cross-sectional area of ​​the connecting hole.

[0024] In one embodiment, the sum of the cross-sectional areas of all the first filter holes is greater than or equal to the cross-sectional area of ​​the connecting hole.

[0025] A vacuum die-casting machine includes the vacuum filter structure described in any of the above embodiments, wherein one end of the vacuum valve connector is fixedly installed at the exhaust port of the vacuum die-casting machine, and the vacuum valve connector is connected to the exhaust port of the vacuum die-casting machine.

[0026] Compared with the prior art, this disclosure has at least the following advantages:

[0027] The aforementioned vacuum filtration structure, with its filter assembly fixed between the vacuum valve and its connector, includes an aluminum liquid barrier. This barrier is used to block the molten aluminum and has several first filter holes, each with a diameter of 30μm-100μm. This effectively prevents the high-temperature molten aluminum in the vacuum die-casting machine from entering the vacuum valve or even the machine itself through the first filter holes. This significantly improves the aluminum liquid barrier capacity of the vacuum filtration structure, avoiding frequent shutdowns for cleaning due to the molten aluminum entering the vacuum valve. This not only greatly reduces the maintenance cost of the vacuum die-casting machine but also significantly improves its production efficiency. Furthermore, it prevents the aluminum liquid barrier from becoming clogged due to the small diameter of the first filter holes, ensuring good gas flow efficiency and thus improving the exhaust efficiency of the vacuum die-casting machine, further enhancing its production efficiency. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the internal structure of a vacuum die-casting machine according to one embodiment;

[0030] Figure 2 for Figure 1 The diagram shows the internal structure of the vacuum die-casting machine.

[0031] Figure 3 for Figure 1 A partially enlarged schematic diagram of the vacuum die-casting machine shown;

[0032] Figure 4 This is an internal schematic diagram of the structural model of a vacuum filter structure. Detailed Implementation

[0033] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0035] 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 disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:

[0037] like Figures 1 to 4 As shown, a vacuum filtration structure 100 of one embodiment includes a vacuum valve 110, a vacuum valve connector 120, and a filter assembly 130 connected in series. One end of the vacuum valve connector 120 is installed and fixed at the exhaust port 200 of the vacuum die-casting machine 10, and the vacuum valve connector 120 is used to communicate with the exhaust port 200 of the vacuum die-casting machine 10. The vacuum valve 110 is installed at the other end of the vacuum valve connector 120. The filter assembly 130 is installed and fixed between the vacuum valve 110 and the vacuum valve connector 120. The filter assembly 130 includes an aluminum liquid blocking component 131, which is used to block the aluminum liquid. The aluminum liquid blocking component 131 has a plurality of first filter holes 1311, and the pore size of each first filter hole 1311 is 30μm-100μm, which effectively prevents the vacuum pressure from being released. The high-temperature molten aluminum inside the casting machine 10 enters the vacuum valve 110 and even the interior of the vacuum machine through the first filter hole 1311. This greatly improves the aluminum liquid blocking capacity of the vacuum filter structure 100, avoiding frequent shutdowns for cleaning of the vacuum die casting machine 10 due to the high-temperature molten aluminum entering the vacuum valve 110. This not only significantly reduces the maintenance cost of the vacuum die casting machine 10 but also greatly improves its production efficiency. At the same time, it also prevents the aluminum liquid blocking component 131 from becoming clogged due to the small aperture of the first filter hole 1311, ensuring that the vacuum filter structure 100 has good gas flow efficiency, thereby giving the vacuum die casting machine 10 good exhaust efficiency and further improving its production efficiency.

[0038] The aforementioned vacuum filter structure 100, with the filter assembly 130 installed and fixed between the vacuum valve 110 and the vacuum valve connector 120, includes an aluminum liquid barrier 131 for blocking the aluminum liquid. The aluminum liquid barrier 131 has a plurality of first filter holes 1311, each with a pore diameter of 30μm-100μm. This effectively prevents the high-temperature aluminum liquid in the vacuum die-casting machine 10 from entering the vacuum valve 110 or even the interior of the vacuum machine through the first filter holes 1311. The aluminum liquid barrier capability is greatly improved, avoiding the need for frequent shutdowns for cleaning of the vacuum die casting machine 10 due to high-temperature aluminum liquid entering the vacuum valve 110. This not only greatly reduces the maintenance cost of the vacuum die casting machine 10, but also greatly improves the production efficiency of the vacuum die casting machine 10. At the same time, it can also avoid the aluminum liquid barrier component 131 from being easily blocked due to the small aperture of the first filter hole 1311, ensuring that the vacuum filter structure 100 has good gas flow efficiency, thereby enabling the vacuum die casting machine 10 to have good exhaust efficiency, and further improving the production efficiency of the vacuum die casting machine 10.

[0039] like Figures 2 to 3 As shown, in one embodiment, the filter assembly 130 further includes a first buffer filter element 132. The first buffer filter element 132 is disposed between the vacuum valve connector 120 and the aluminum liquid barrier element 131. The first buffer filter element 132 is used to slow down the flow rate of the aluminum liquid to buffer the thermal shock of the aluminum liquid, effectively reducing the pressure on the aluminum liquid barrier element 131, thereby greatly improving the barrier effect of the aluminum liquid barrier element 131, and thus greatly improving the aluminum liquid barrier capability of the vacuum filter structure 100. At the same time, the first buffer filter element 132 can also assist the aluminum liquid barrier element 131 in intercepting part of the aluminum liquid and impurities in the aluminum liquid, further improving the aluminum liquid barrier capability of the vacuum filter structure 100.

[0040] like Figures 2 to 3 As shown, in one embodiment, the first buffer filter 132 is formed with a plurality of second filter holes 1321, the sum of the cross-sectional areas of all the second filter holes 1321 is greater than or equal to the sum of the cross-sectional areas of all the first filter holes 1311, so as to ensure that the vacuum filter structure 100 has better gas flow efficiency, so that the vacuum die casting machine 10 has better exhaust efficiency, thereby improving the production efficiency of the vacuum die casting machine 10.

[0041] like Figures 2 to 3As shown, in one embodiment, the filter assembly 130 further includes a second buffer filter element 133, which is disposed between the vacuum valve connector 120 and the first buffer filter element 132. The second buffer filter element 133 is used to slow down the flow rate of the molten aluminum to further buffer the thermal shock of the molten aluminum, greatly reducing the pressure on the first buffer filter element 132 and the molten aluminum barrier element 131, thereby greatly improving the blocking effect of the molten aluminum barrier element 131 and further improving the molten aluminum barrier capability of the vacuum filter structure 100. At the same time, the second buffer filter element 133 can also assist the first buffer filter element 132 and the molten aluminum barrier element 131 in intercepting impurities in the molten aluminum, further improving the molten aluminum barrier capability of the vacuum filter structure 100.

[0042] like Figures 2 to 3 As shown, in one embodiment, the second buffer filter 133 is formed with a plurality of third filter holes 1331, the sum of the cross-sectional areas of all the third filter holes 1331 is greater than or equal to the sum of the cross-sectional areas of all the first filter holes 1311, so as to ensure that the vacuum filter structure 100 has better gas flow efficiency, so that the vacuum die casting machine 10 has better exhaust efficiency, thereby improving the production efficiency of the vacuum die casting machine 10.

[0043] like Figures 2 to 3 As shown, in one embodiment, the diameter of each second filter hole 1321 is 30μm-100μm to slow down the flow rate of the molten aluminum, reduce the pressure on the molten aluminum barrier 131, and thus improve the molten aluminum barrier capability of the vacuum filter structure 100. At the same time, the first buffer filter 132 can also assist the molten aluminum barrier 131 in intercepting part of the molten aluminum and impurities in the molten aluminum, so as to avoid the impurities in the molten aluminum from clogging the first filter hole 1311 of the molten aluminum barrier 131, so that the vacuum filter structure 100 has better gas flow efficiency, thereby greatly improving the operational stability of the vacuum die casting machine 10.

[0044] like Figures 2 to 3 As shown, in one embodiment, the diameter of each third filter hole 1331 is 0.5mm-1mm to slow down the flow rate of the molten aluminum, reduce the pressure on the first buffer filter 132 and the molten aluminum barrier 131, and further improve the molten aluminum barrier capability of the vacuum filter structure 100. At the same time, the second buffer filter 133 can also assist the first buffer filter 132 and the molten aluminum barrier 131 in intercepting some impurities in the molten aluminum, so as to avoid the impurities in the molten aluminum from clogging the first filter hole 1311 and the second filter hole 1321, so that the vacuum filter structure 100 has better gas flow efficiency, and further improves the operational stability of the vacuum die casting machine 10.

[0045] like Figure 3As shown, in one embodiment, the first buffer filter element 132 is a ceramic fiber layer, so that the first buffer filter element 132 has good high temperature resistance and corrosion resistance, enabling the first buffer filter element 132 to maintain stable filtration performance in high temperature aluminum liquid, thereby greatly improving the stability of the vacuum filter structure 100 in use; at the same time, the ceramic fiber layer also has good air permeability, ensuring that the first buffer filter element 132 can have good gas flow efficiency.

[0046] like Figures 2 to 3 As shown, in one embodiment, the thickness of the first buffer filter element 132 is 2mm-3mm, so that the first buffer filter element 132 has better structural strength and improves the stability of the vacuum filter structure 100 in use.

[0047] like Figure 3 As shown, in one embodiment, the aluminum liquid barrier 131 is a metal sintered filter element, so that the aluminum liquid barrier 131 has good high temperature resistance and corrosion resistance, enabling the aluminum liquid barrier 131 to maintain stable filtration performance in high temperature aluminum liquid, thereby greatly improving the stability of the vacuum filtration structure 100.

[0048] like Figure 3 As shown, in one embodiment, the second buffer filter element 133 is a stainless steel support mesh, so that the second buffer filter element 133 has good high temperature resistance and corrosion resistance, enabling the second buffer filter element 133 to maintain stable filtration performance in high temperature aluminum liquid, further improving the stability of the vacuum filter structure 100 in use. At the same time, it also makes the second buffer filter element 133 have good structural strength, further improving the stability of the vacuum filter structure 100 in use.

[0049] like Figures 2 to 3 As shown, in one embodiment, the second buffer filter 133 has a corrugated three-dimensional woven structure to further improve the structural strength of the second buffer filter 133.

[0050] like Figures 2 to 3 As shown, in one embodiment, the vacuum valve connector 120 has a communicating hole 121 and a mounting hole 122. The mounting hole 122 is connected to the exhaust hole 200 of the vacuum die casting machine 10 through the communicating hole 121. The vacuum valve 110 is screwed into the mounting hole 122 to facilitate the installation and removal of the vacuum valve 110, which greatly reduces the difficulty of replacing the vacuum valve 110 and thus greatly reduces the maintenance difficulty of the vacuum die casting machine 10.

[0051] like Figures 2 to 3As shown, in one embodiment, the inner peripheral wall of the mounting hole 122 is formed with a first threaded connection portion (not shown), and the outer peripheral wall of the vacuum valve 110 is formed with a second threaded connection portion (not shown). The first threaded connection portion is threadedly connected to the second threaded connection portion to facilitate the replacement and maintenance of the vacuum valve 110.

[0052] like Figures 2 to 3 As shown, in one embodiment, the vacuum filter structure 100 includes a first fastener 140 and a second fastener 150. The diameter of the connecting hole 121 is smaller than the diameter of the mounting hole 122, so that a step layer 123 is formed at the connection between the connecting hole 121 and the mounting hole 122. A second buffer filter element 133 is disposed in the mounting hole 122. The first fastener 140 and the second fastener are both screwed into the mounting hole 122. The two sides of the second buffer filter element 133 abut against and limit the step layer 123 and the first fastener 140, respectively, so that the second buffer filter element 133 is fixed in the mounting hole 122. The first buffer filter element 132 is disposed in the mounting hole 122. The two sides of the first buffer filter element 132 abut against the first fastener 140 and the second fastener 150, respectively. The first buffer filter 132 is fixed in the mounting hole 122 by the abutment limit of the component 150. The aluminum liquid barrier 131 is disposed in the mounting hole 122, and the two sides of the aluminum liquid barrier 131 abut against the second fastener 150 and the vacuum valve 110 respectively, so that the aluminum liquid barrier 131 is fixed in the mounting hole 122. This makes the aluminum liquid barrier 131, the first buffer filter 132 and the second buffer filter 133 securely fixed in the mounting hole 122, which greatly improves the stability of the vacuum filter structure 100 and greatly reduces the difficulty of installing and disassembling the aluminum liquid barrier 131, the first buffer filter 132 and the second buffer filter 133, thereby greatly reducing the difficulty of maintenance and replacement of the vacuum filter structure 100.

[0053] like Figures 2 to 3 As shown, in this embodiment, the outer peripheral wall of the first fastener 140 has a third threaded connection portion (not shown), which is threadedly connected to the first threaded connection portion; the outer peripheral wall of the second fastener 150 has a fourth threaded connection portion (not shown), which is threadedly connected to the first threaded connection portion, so as to facilitate the replacement and maintenance of the aluminum liquid barrier 131, the first buffer filter 132 and the second buffer filter 133.

[0054] like Figures 2 to 3 As shown, in this embodiment, both the first fastener 140 and the second fastener 150 are fastening nuts.

[0055] like Figures 2 to 3As shown, in one embodiment, the cross-sectional areas of the first buffer filter 132 and the second buffer filter 133 are both larger than the cross-sectional area of ​​the connecting hole 121, so that the first buffer filter 132 and the second buffer filter 133 can be installed and confined within the mounting hole 122.

[0056] like Figures 2 to 3 As shown, in one embodiment, the sum of the cross-sectional areas of all the first filter holes 1311 is greater than or equal to the cross-sectional area of ​​the connecting hole 121, so as to ensure that the vacuum filter structure 100 has a better gas flow efficiency, so that the vacuum die casting machine 10 has a better exhaust efficiency, thereby improving the production efficiency of the vacuum die casting machine 10.

[0057] This disclosure also provides a vacuum die casting machine 10, including the vacuum filter structure 100 described in any of the above embodiments, one end of the vacuum valve connector 120 is installed and fixed at the exhaust port 200 of the vacuum die casting machine 10, and the vacuum valve connector 120 is connected to the exhaust port 200 of the vacuum die casting machine 10.

[0058] Compared with the prior art, this disclosure has at least the following advantages:

[0059] The aforementioned vacuum die-casting machine 10, with its filter assembly 130 fixed between the vacuum valve 110 and the vacuum valve connector 120, includes an aluminum liquid barrier 131 for blocking the aluminum liquid. The aluminum liquid barrier 131 has a plurality of first filter holes 1311, each with a diameter of 30μm-100μm. This effectively prevents the high-temperature aluminum liquid inside the vacuum die-casting machine 10 from entering the vacuum valve 110 or even the interior of the vacuum machine through the first filter holes 1311, thus ensuring the vacuum filtration structure 100 effectively prevents the high-temperature aluminum liquid inside the vacuum die-casting machine 10 from entering the vacuum valve 110 or even the interior of the vacuum machine. The aluminum liquid barrier capability is greatly improved, avoiding the need for frequent shutdowns for cleaning of the vacuum die-casting machine 10 due to high-temperature aluminum liquid entering the vacuum valve 110. This not only greatly reduces the maintenance cost of the vacuum die-casting machine 10, but also greatly improves the production efficiency of the vacuum die-casting machine 10. At the same time, it can also prevent the aluminum liquid barrier component 131 from being easily blocked due to the small aperture of the first filter hole 1311, ensuring that the vacuum filter structure 100 has good gas flow efficiency, thereby enabling the vacuum die-casting machine 10 to have good exhaust efficiency, and further improving the production efficiency of the vacuum die-casting machine 10.

[0060] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A vacuum filtration structure, characterized in that, It includes a connected vacuum valve, a vacuum valve connector, and a filter assembly; one end of the vacuum valve connector is used to be installed and fixed at the exhaust port of the vacuum die-casting machine, and the vacuum valve connector is used to communicate with the exhaust port of the vacuum die-casting machine, and the vacuum valve is installed at the other end of the vacuum valve connector; The filter assembly is installed and fixed between the vacuum valve and the vacuum valve connector. The filter assembly includes an aluminum liquid barrier, which is used to block the aluminum liquid. The aluminum liquid barrier has a plurality of first filter holes, and the diameter of each first filter hole is 30μm-100μm.

2. The vacuum filtration structure according to claim 1, characterized in that, The filtration assembly further includes a first buffer filter element, which is disposed between the vacuum valve connector and the molten aluminum barrier element, and is used to slow down the flow rate of the molten aluminum.

3. The vacuum filtration structure according to claim 2, characterized in that, The first buffer filter element has a plurality of second filter holes, and the sum of the cross-sectional areas of all the second filter holes is greater than or equal to the sum of the cross-sectional areas of all the first filter holes.

4. The vacuum filtration structure according to claim 3, characterized in that, The filtration assembly further includes a second buffer filter element, which is disposed between the vacuum valve connector and the first buffer filter element. The second buffer filter element is used to slow down the flow rate of the molten aluminum.

5. The vacuum filtration structure according to claim 4, characterized in that, The second buffer filter element has a plurality of third filter holes, and the sum of the cross-sectional areas of all the third filter holes is greater than or equal to the sum of the cross-sectional areas of all the first filter holes.

6. The vacuum filtration structure according to claim 5, characterized in that, The pore size of each of the second filter pores is 30mm-100μm; and / or, Each of the third filter pores has a pore size of 0.5 mm to 1 mm; and / or, The first buffer filter element is a ceramic fiber layer; and / or, The thickness of the first buffer filter element is 2mm-3mm; and / or, The aluminum melt barrier is a sintered metal filter element; and / or... The second buffer filter element is a stainless steel support mesh; and / or, The second buffer filter element has a corrugated three-dimensional woven structure.

7. The vacuum filtration structure according to claim 5, characterized in that, The vacuum valve connector has a connecting hole and a mounting hole. The mounting hole is connected to the exhaust hole of the vacuum die-casting machine through the connecting hole. The vacuum valve is screwed into the mounting hole.

8. The vacuum filtration structure according to claim 7, characterized in that, The inner peripheral wall of the mounting hole has a first threaded connection portion, and the outer peripheral wall of the vacuum valve has a second threaded connection portion, with the first threaded connection portion threadedly connected to the second threaded connection portion.

9. The vacuum filtration structure according to claim 7, characterized in that, The vacuum filter structure includes a first fastener and a second fastener. The diameter of the connecting hole is smaller than the diameter of the mounting hole, so that a stepped layer is formed at the connection between the connecting hole and the mounting hole. The second buffer filter is disposed in the mounting hole. The first fastener and the second fastener are both screwed into the mounting hole. The two sides of the second buffer filter abut against the stepped layer and the first fastener, respectively, to limit and fix the second buffer filter in the mounting hole. The first buffer filter is disposed in the mounting hole, and the two sides of the first buffer filter abut against the first fastener and the second fastener, respectively, to limit and fix the first buffer filter in the mounting hole. The molten aluminum barrier is disposed in the mounting hole, and the two sides of the molten aluminum barrier abut against the second fastener and the vacuum valve, respectively, to limit and fix the molten aluminum barrier in the mounting hole. And / or The cross-sectional areas of both the first and second buffer filters are larger than the cross-sectional area of ​​the connecting hole; and / or, The sum of the cross-sectional areas of all the first filter holes is greater than or equal to the cross-sectional area of ​​the connecting hole.

10. A vacuum die-casting machine, characterized in that, The vacuum filter structure includes any one of claims 1 to 9, wherein one end of the vacuum valve connector is fixedly installed at the exhaust port of the vacuum die-casting machine, and the vacuum valve connector is connected to the exhaust port of the vacuum die-casting machine.

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