Filter for molten metal liquid

Abstract

The utility model provides a filter for molten metal. The filter comprises a hollow outer frame; the multiple rough filtration supporting assemblies are arranged in the hollow outer frame in a stacked mode, and the filtering assemblies are located between the rough filtration supporting assemblies; wherein the filter assembly comprises more than two filter layers; the filter layer comprises a plurality of first filter strips arranged side by side in the same direction, and the first filter strips are wavy and located on the plane where the filter layer is located; in one filtering assembly, the first filtering strips of the filtering layer are arranged in the same direction; and in the length direction of the first filter strips, the adjacent first filter strips are arranged in a staggered manner between the two adjacent filter layers, so that a molten metal channel is formed between the adjacent first filter strips between the adjacent filter layers. By means of the filter, the filter area is increased, the contact time of molten metal and the filter is prolonged, the turbulence and vortex phenomena of the molten metal at the inlet of the molten metal channel are reduced, and the filter effect is improved.

Description

Technical Field

[0001] This application relates to the field of metal casting technology, and more specifically to a filter for molten metal. Background Technology

[0002] In the metal casting process, molten metal filters are used to remove inclusions, impurities, and air bubbles from the molten metal in order to improve the quality and performance of the castings.

[0003] Currently, common molten metal filters include foam filters and straight-hole filters. Foam ceramic filters use polyurethane foam as their porous framework. Polyurethane foam is prepared using a foaming method, which results in uneven pore size. Furthermore, the framework is fine, has many burrs, and is prone to chipping and breakage – problems that foam ceramic filters cannot solve. Straight-hole filters are molded and have a pore structure with regularly arranged holes on the surface, such as round, square, or triangular holes. They have a through-hole structure, and the shape and distribution of the pores are relatively fixed, making it difficult to achieve high filtration efficiency and precision. During the casting process, the impact force of the molten metal is high, and the pores of this type of filter provide some resistance to the flow of the molten metal, making it prone to damage.

[0004] Therefore, a metal liquid filter that is effective, economical, and durable is needed. Utility Model Content

[0005] To address the problems in the prior art, this application provides a ceramic liquid filter for molten metal. The technical solution of this application is as follows:

[0006] A filter for molten metal.

[0007] Includes: a hollow outer frame; and multiple coarse filter support components stacked within the hollow outer frame, and filter components located between the coarse filter support components;

[0008] The filter assembly includes two or more filter layers.

[0009] The filter layer includes: multiple first filter strips arranged side by side in the same direction, the first filter strips being wavy and located in the plane of the filter layer;

[0010] In a filter assembly, the first filter strips of the filter layers are arranged in the same direction; and, along the length direction of the first filter strips, adjacent first filter strips of two adjacent filter layers are staggered to form a molten metal channel between adjacent first filter strips of adjacent filter layers.

[0011] Furthermore, in a filter assembly, the first filter strips are staggered between adjacent filter layers in a direction perpendicular to the length of the first filter strip.

[0012] Furthermore, in one of the filter layers, on the straight line defined by the length direction of the first filter strip, the projection positions of the peaks and troughs of the first filter strips on the straight line are the same for different first filter strips.

[0013] Furthermore, the filter for molten metal includes three or more of the coarse filter support assemblies, with the first filter strips arranged in opposite directions between adjacent filter assemblies.

[0014] Furthermore, between two adjacent filter components, the projection of the first filter strip onto the plane of any of the filter layers forms an angle of 45° to 90°.

[0015] Furthermore, the coarse filter support assembly includes: two or more coarse filter support layers; each coarse filter support layer includes: parallel second filter bars, the second filter bars being straight; the second filter bars between adjacent coarse filter support layers are arranged in opposite directions; and the second filter bars of the coarse filter support layer adjacent to the filter layer are arranged in the same direction as the first filter bars of the filter layer.

[0016] Furthermore, between adjacent coarse filter support layers, the included angle of the projection of the second filter strip onto the plane where the coarse filter support layer is located is 60 to 120 degrees.

[0017] Furthermore, the diameter of the first filter strip and / or the second filter strip is 0.1 to 5 mm.

[0018] Furthermore, the total number of layers of the filter layer and the coarse filter support layer is 8 to 20.

[0019] Furthermore, the diameter of the second filter strip of the outermost coarse filter support layer is greater than or equal to the diameter of the second filter strip of the other coarse filter support layers.

[0020] The molten metal filter provided in this application has several advantages. First, the wavy shape of the first filter bar helps to increase the filtration area. Second, the formed molten metal channel slows down the flow of molten metal to the coarse filter support assembly on the outflow side, prolongs the contact time between the molten metal and the molten metal filter, and reduces turbulence and eddies at the inlet of the molten metal channel, thereby improving the filtration effect. As the molten metal continues to flow, the pore walls of the molten metal filter gradually adsorb impurities in the molten metal, further purifying the molten metal. In addition, the coarse filter support assembly can perform coarse filtration and support the filter layer assembly.

[0021] The above description is merely an overview of the technical solution of this application. In order to make the technical means of this application clearer and more understandable, so that those skilled in the art can implement it according to the contents of the specification, and in order to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are illustrated below. Attached Figure Description

[0022] Figure 1 A side view of a filter for molten metal in one embodiment of this application;

[0023] Figure 2 : A top view of a filter for molten metal in one embodiment of this application;

[0024] Figure 3 : A schematic diagram of the exploded structure between the components of the filter for molten metal in one embodiment of this application;

[0025] Figure 4 : A schematic diagram showing the positions of two adjacent first filter strips between two adjacent filter layers in the same filter layer assembly in one embodiment of this application;

[0026] Figure 5 : A schematic diagram showing the positions of two adjacent first filter strips between two adjacent filter layers in the same filter layer assembly in another embodiment of this application.

[0027] Explanation of reference numerals in the attached figures:

[0028] 100. Hollow outer frame;

[0029] 200. Coarse filter support assembly; 210. Coarse filter support layer; 211. Second filter strip;

[0030] 300. Filter assembly; 310. Filter layer; 311. First filter strip;

[0031] 400. Liquid metal channel. Detailed Implementation

[0032] The following embodiments of this application are only used to illustrate specific implementation methods of this application, and these embodiments should not be construed as limitations on this application. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of this application shall be considered equivalent substitutions and fall within the protection scope of this application.

[0033] Those skilled in the art should understand that, in the disclosure of this application, the terms "first," "second," "third," "fourth," "fifth," etc., are only used to distinguish different structures and do not limit the number of specific structures, connection relationships, etc.; in addition, the orientation or positional relationship indicated by "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this application.

[0034] In this application, the direction of the "first filter strip" refers to its length direction, specifically the direction of the longest side of the smallest outer rectangle of the "first filter strip".

[0035] In this application, "wavy" includes simple harmonic waves (such as sine waves), sawtooth waves, trapezoidal waves, and other shapes with alternating peaks and troughs.

[0036] This embodiment provides a filter for molten metal (hereinafter also referred to as "the filter of this application"), such as... Figures 1-5 As shown, it includes: a hollow outer frame 100; and two or more (e.g., 2, 3, 4 or more) coarse filter support assemblies stacked within the hollow outer frame 100, and filter assembly 300 located between the coarse filter support assemblies 200.

[0037] Each of the filter layer components 300 includes two or more filter layers 310 (e.g., two, three, four or five or more).

[0038] Each filter layer 310 includes: multiple first filter strips 311 arranged side by side in the same direction, the first filter strips 311 being wavy and located in the plane of the filter layer 310;

[0039] In the filter assembly 300, the first filter strips 311 of the filter layer 310 are arranged in the same direction; and, along the length direction of the first filter strip 311, adjacent first filter strips 311 of two adjacent filter layers 310 are staggered to form a molten metal channel 400 between adjacent first filter strips 311 of adjacent filter layers 310 (see...). Figure 4 , Figure 5 ).

[0040] In this embodiment, the "wavy" shape is a sine wave with an amplitude of 1 to 20 mm and a wavelength of 1 to 20 mm. Specifically, in this embodiment, the amplitude of the sine wave is 3 mm and the wavelength is 5 mm.

[0041] Regarding the spacing of the first filter strips 311 in a filter layer 310, those skilled in the art can select the spacing according to the specific application scenario. Considering common application scenarios, the spacing is preferably 1 to 10 mm. The spacing of the first filter strips 311 refers to the minimum distance between two adjacent first filter strips 311.

[0042] Regarding the materials for the filter (hollow outer frame, coarse filter support assembly, filter assembly) in this application, existing ceramic refractory materials can be selected, such as mullite, alumina, zirconium oxide, silicon carbide, magnesium oxide, zirconium silicate, spinel, graphite, etc.

[0043] In this embodiment, along the length of the first filter strip 311, adjacent first filter strips 311 are staggered (peaks and troughs are staggered; for the sinusoidal waveform in this embodiment, this means there is a phase difference, preferably 180°) to form a molten metal channel. Thus, on the one hand, the wavy shape of the first filter strip 311 helps increase the filtration area; on the other hand, the formed molten metal channel can slow down the flow of molten metal to the coarse filter support assembly on the outflow side, prolonging the contact time between the molten metal and the filter of this application, and reducing turbulence at the inlet of the molten metal channel. The eddy current phenomenon improves the filtration effect. As the molten metal flows continuously, the pore walls of the filter in this application will gradually adsorb impurities in the molten metal, further purifying the molten metal. In particular, when the first filter bar 311 is in the shape of a sine wave, it can form a nearly circular molten metal channel, which has better fluid flow performance in terms of fluid dynamics, can reduce the resistance when the fluid passes through, and evenly distribute the fluid pressure, thereby improving filtration efficiency and stability. In addition, the coarse filter support assembly can play the role of coarse filtration and support the filter layer assembly. Regarding the coarse filter support assembly, a mesh structure filter screen can be selected. Of course, the structure described below is preferred.

[0044] Preferably, such as Figures 1-3 As shown, in a filter assembly, in the length direction perpendicular to the first filter strip 311, the first filter strips of two adjacent filter layers 310 are staggered. That is, on the projection of the plane containing any filter layer 310, the projection of the first filter strip 311 of one filter layer 310 and the first filter strip 311 of the other filter layer 310 are displaced in the length direction perpendicular to the first filter strip. Preferably, the projection of the first filter strip 311 of one filter layer 310 is located between the projections of the two first filter strips 311 of the other filter layer 310. This is suitable for better forming of the aforementioned liquid metal channel to achieve a better filtration effect.

[0045] Preferably, such as Figures 1-3As shown, in one of the filter layers, on the straight line defined by the length direction of the first filter strip, the projection positions of the peaks and troughs of the first filter strips on this straight line are the same for different first filter strips. Therefore, for a filter layer 310, the first filter strips 311 have the same phase, while for adjacent filter layers 310, there is a phase difference (preferably 180°) between the first filter strips 311. This makes it easier to form the aforementioned liquid metal channels, thereby achieving a better filtration effect.

[0046] In one implementation, such as Figures 1-3 As shown, the filter of this application includes three or more coarse filter support components (at this time, there are two or more filter components). Between two adjacent filter components, the first filter strips are arranged in opposite directions, which can block the metal liquid channel formed by the filter layer, intercept impurities in the fluid from different directions, further refine the filtration accuracy, and retain larger particulate impurities, while not affecting the normal flow path of the fluid in the filter. The overlapping and combined assembly of the prepared components realizes the overall tortuous channel, so as to achieve the overall variable porosity and rapid preparation. The pore structure is controllable, the pore connectivity is high, the porosity is high, the surface area is large, and the mechanical properties are good.

[0047] Preferably, the projection of the first filter strip onto the plane of any of the filter layers forms an angle of 45° to 90° (e.g., 45°, 60°, 90°, etc.) between two adjacent filter components.

[0048] In one implementation, such as Figures 1-3 As shown,

[0049] The coarse filter support assembly 200 includes: two or more (e.g., two, three, four or five or more) coarse filter support layers 210;

[0050] The coarse filter support layer 210 includes: a second filter bar 211 arranged in parallel, the second filter bar 211 being straight;

[0051] The second filter strips 211 between adjacent coarse filter support layers 210 are arranged in opposite directions; and,

[0052] The second filter strip 211 of the coarse filter support layer 210 adjacent to the filter layer 310 is arranged in the same direction as the first filter strip 311 of the filter layer.

[0053] Regarding the spacing of the second filter strips 211 in a coarse filter support layer 210, those skilled in the art can select the spacing according to the specific application scenario. Considering common application scenarios, the spacing is preferably 1mm to 10mm.

[0054] Therefore, for the coarse filter support assembly located on the side where the molten metal flows in, the second filter strips 211 between adjacent coarse filter support layers 210 are arranged in opposite directions (preferably, the angle between the projections of the second filter strips on the plane of the coarse filter support layer between adjacent coarse filter support layers is 60-120°, more preferably they are perpendicular to each other (i.e., perpendicular to each other in opposite directions)), which can increase the support for the filter layer assembly; the mesh structure formed by the oppositely arranged second filter strips 211 can initially guide and divert the molten metal, and filter out impurities with larger particles, such as larger inclusions, oxide scale, etc.

[0055] Furthermore, for the coarse filter support assembly located on the side where the molten metal flows out, in the adjacent coarse filter support layer 210 and filter layer 310, the straight second filter strip 211 is parallel to the length direction of the wavy first filter strip 311. This allows the second filter strip 211 to block the molten metal flowing out of the molten metal channel, further refining the filtration accuracy, while not affecting the normal flow path of the molten metal within the filter of this application. Moreover, the second filter strips 211 of adjacent coarse filter support layers 210 are arranged in opposite directions, so that the coarse filter support layer 210 farther from the filter layer 310 also acts as a channel blocker, working in conjunction with the closer coarse filter support layer 210 to intercept impurities in the fluid from different directions. This structure also allows the molten metal to flow back and forth between these two layers, increasing the filtration area. The lines of these two layers can each form corners with the arc-shaped channels, further intercepting and adsorbing impurities, thereby further improving the filtration effect and making the filtered molten metal purer.

[0056] The filter of this application with the above structure allows the molten metal to be coarsely filtered by the inflow-side coarse filter support assembly before entering the filter assembly. The molten metal channel formed by the filter assembly can also form a spiral flow channel to generate a centrifugal separation effect. The coarse filter support assembly on the outflow side forms a three-dimensional interception net, which can further intercept and adsorb impurities compared with existing molten metal filters.

[0057] In one implementation, such as Figures 1-3 As shown, the diameter of the first filter strip 311 and / or the second filter strip 211 is 0.1 to 5 mm (e.g., 0.1 mm, 0.2 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm).

[0058] In this application, the diameter of the first filter strip 311 and the diameter of the second filter strip 211 refer to the diameter of the circle equivalent to the area of ​​their cross-section, that is, the diameter of a circle with the same area of ​​the cross-section.

[0059] The diameters of the first filter strip 311 and the second filter strip 211 can be selected according to the requirements of the casting system and the actual application scenario of the filter for molten metal. A diameter of 0.1 to 5 mm can meet most current industrial scenarios. Preferably, the diameter is 0.5 to 3 mm. For example, in the casting system for small castings, a smaller diameter, such as 0.5 to 1 mm, can be selected; while in the casting system for large castings, in order to ensure filtration effect and structural strength, the diameter can be appropriately increased, such as 2 to 3 mm.

[0060] Preferably, the diameter of the second filter strip 211 of the outermost coarse filter support layer 210 is greater than or equal to (more preferably greater than) the diameter of the second filter strip 211 of the other coarse filter support layers 210. This further enhances the support force of the filter, ensuring that the filter can withstand the impact and pressure of molten metal during use, and improving the stability and service life of the filter.

[0061] Regarding the number of filter layers 210 and coarse filter support layers 211 in the filter of this application, those skilled in the art can make appropriate selections based on the above scheme and the actual application scenario. Preferably, the total number of filter layers and coarse filter support layers is 8 to 20 layers, thereby meeting the requirements of most current industrial scenarios for filtration effect and filter thickness of this application.

[0062] Example 1: The molten metal filter comprises, in sequence:

[0063] The coarse filter support assembly includes two coarse filter support layers;

[0064] The filter assembly includes two filter layers;

[0065] The coarse filter support assembly consists of four coarse filter support layers.

[0066] The second filter strip (circular cross-section) of the coarse filter support layer has a diameter of 0.5 mm and a spacing of 5 mm; the first filter strip of the filter layer has a sinusoidal waveform (amplitude 5 mm, wavelength 10 mm), a circular cross-section, and a diameter of 1 mm. The first filter strip has the same phase in the same filter layer and a spacing of 5 mm. There is a 180° phase difference between adjacent filter layers; the second filter strip and the first filter strip are in the same direction between adjacent coarse filter support layers and filter layers.

[0067] Example 2

[0068] The molten metal filter comprises, in sequence:

[0069] The coarse filter support assembly includes two coarse filter support layers;

[0070] The filter assembly includes two filter layers;

[0071] The coarse filter support assembly includes two coarse filter support layers;

[0072] The filter assembly includes two filter layers;

[0073] The coarse filter support assembly includes two coarse filter support layers.

[0074] The second filter strip (circular cross-section) of the coarse filter support layer has a diameter of 0.5 mm and a spacing of 5 mm; the first filter strip of the filter layer has a sinusoidal waveform (amplitude 5 mm, wavelength 10 mm), a circular cross-section, a diameter of 0.8 mm, and the same phase within the same filter layer with a spacing of 1.2 mm. There is a 180° phase difference between adjacent filter layers. The first filter strips of the two filter components are perpendicular (opposite plane perpendicular) to each other; between adjacent coarse filter support layers and filter layers, the second filter strip is in the same direction as the first filter strip.

[0075] Comparative Example 1:

[0076] A conventional straight-hole filter is used, which has a vertical mesh structure, with each filter hole having a diameter of 1.7mm, a spacing of 5mm between filter holes, and a thickness of 20mm.

[0077] Test case

[0078] The filters selected in the above embodiments were used to conduct casting experiments with molten aluminum alloy, and the inclusion rejection rate and throughput at 500 micrometers were tested.

[0079] Retention rate % Flux kg Example 1 92 100 Example 2 90 100 Comparative Example 1 60 70

[0080] The test results above show that, compared with Comparative Example 1 (existing scheme), Example 1 improved the 500μm particle rejection rate by 53.33% and the throughput by 42.86%, while Example 2 improved the 500μm particle rejection rate by 50.00% and the throughput by 42.86%.

[0081] Although the embodiments of this application have been described above, this application is not limited to the specific embodiments and application fields described above. The specific embodiments described above are merely illustrative and instructive, and not restrictive. Those skilled in the art, based on the guidance of this specification and without departing from the scope of protection of the claims of this application, can make many other forms, all of which are within the scope of protection claimed in this application.

Claims

1. A filter for molten metal, characterized in that, include: Hollow outer frame; In addition, multiple coarse filter support components are stacked within the hollow outer frame, and filter components are located between the coarse filter support components; The filter assembly includes two or more filter layers. The filter layer includes: multiple first filter strips arranged side by side in the same direction, the first filter strips being wavy and located in the plane of the filter layer; In a filter assembly, the first filter strips of the filter layers are arranged in the same direction; and, along the length direction of the first filter strips, adjacent first filter strips of two adjacent filter layers are staggered to form a molten metal channel between adjacent first filter strips of adjacent filter layers.

2. The filter for molten metal as described in claim 1, characterized in that, In a filter assembly, the first filter strips are staggered between adjacent filter layers in a direction perpendicular to the length of the first filter strip.

3. The filter for molten metal as described in claim 1, characterized in that, In one of the filter layers, on a straight line defined by the length direction of the first filter strip, the projections of the first filter strips on that straight line have the same peak projection position and the same trough projection position among different first filter strips.

4. The filter for molten metal as described in claim 1, characterized in that, The filter for molten metal includes three or more of the coarse filter support assemblies, with the first filter strips arranged in opposite directions between adjacent filter assemblies.

5. The filter for molten metal as described in claim 4, characterized in that, Between two adjacent filter components, the projection of the first filter strip onto the plane of any of the filter layers forms an angle of 45° to 90°.

6. The filter for molten metal as described in claim 1, characterized in that, The coarse filter support assembly includes: two or more coarse filter support layers; The coarse filter support layer includes: a second filter bar arranged in parallel, the second filter bar being straight; The second filter strips between adjacent coarse filter support layers are arranged in opposite directions; and, The second filter strip of the coarse filter support layer adjacent to the filter layer is arranged in the same direction as the first filter strip of the filter layer.

7. The filter for molten metal as described in claim 6, characterized in that, Between adjacent coarse filter support layers, the included angle of the projection of the second filter strip onto the plane where the coarse filter support layer is located is 60 to 120 degrees.

8. The filter for molten metal as described in claim 6, characterized in that, The diameter of the first filter strip and / or the second filter strip is 0.1 to 5 mm.

9. The filter for molten metal as described in claim 6, characterized in that, The total number of layers in the filter layer and the coarse filter support layer is 8 to 20.

10. The filter for molten metal as described in claim 6, characterized in that, The diameter of the second filter strip in the outermost coarse filter support layer is greater than or equal to the diameter of the second filter strip in the other coarse filter support layers.

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