Filter stick, filter equipment and preparation method of filter stick

Abstract

The invention relates to the technical field of filters, and provides a filter stick, filter equipment and a preparation method thereof. The filter stick comprises a stick body cylinder and a filter device, and an interlayer flow channel is adaptively designed between the filter device and the stick body cylinder; a blind plate is arranged on the periphery of the filtering device and fixed to the outer side face of the rod cylinder in a matched mode, the filtering device is provided with a filtering layer in a matched mode, a filtering layer flow channel is designed between the filtering layer and the filtering device in a matched mode, and a rod cylinder flow channel is designed on the side wall of the rod cylinder in a matched mode. And the filter layer flow channel, the interlayer flow channel and the rod body cylinder flow channel are matched and correspond to one another and jointly form a filter flow channel. Filtering equipment using the filter stick can be used for purification of various liquid foods such as wine and beverages, solid-liquid separation of industrial water such as seawater purification and wastewater treatment, purification of domestic water such as tap water and the like. According to the filter stick and the filtering equipment, the solid-liquid separation efficiency is improved, and the application field is expanded.

Description

Technical Field

[0001] The invention relates to the technical field of filters, and in particular to a filter rod, a filter device and a preparation method thereof. Background Art

[0002] Solid-liquid separation is used in many fields, for filtering and purifying liquids, for solid-liquid separation of liquid foods, such as solid-liquid separation and drying of filtered residual liquids such as wine, beverages, and syrups; for solid-liquid separation of industrial water, such as seawater purification, aquaculture manure treatment, nuclear wastewater treatment, river cleaning treatment, power plant and chemical plant wastewater treatment, separation and purification of new energy lithium battery material washing wastewater treatment; for solid-liquid separation of domestic water, such as tap water purification, building pipe gallery water treatment, gardening water treatment, etc. Due to the current problems of core filter components such as filter elements, filter rods, and drums, including various blockages that require intermittent backwashing or backblowing to remove cakes, the need to pre-coat filter aids before starting filtration, the unscientific design of the filter rod structure, especially the stainless steel particle sintered filter rod, which is a particle sintered structure that cannot completely avoid the shedding of metal particles, there are hidden dangers in liquid food safety, the filter rod is inconvenient to clean, and the filtration efficiency and filtration quality are not up to expectations, which cannot meet market demand. However, with the advancement of purification, extraction and filtration technology, filter aid media such as diatomaceous earth have been eliminated. However, the existing technology does not yet have core components such as filter elements, drums or filter rods that are suitable for filtration systems without filter aid media.

[0003] Based on the problems in the prior art, the present invention proposes a filter rod suitable for filtering equipment in various application scenarios and a preparation method thereof. Summary of the invention

[0004] In order to meet the technological progress in the field of filtration and fill and enrich the current solid-liquid separation filtration devices, the inventive concept of the present invention is proposed. According to different application scenarios and processing objects, millimeter-level, micron-level or nanometer-level stainless steel sintered filter layers are selected and adapted and fixed for use in one or more of candle filters, rotary drum filters, and vertical filters, thereby solving the above-mentioned technical problems in the prior art.

[0005] The present invention proposes a filter rod, comprising: a rod body cylinder; a filtering device; a sandwich flow channel is adapted and designed between the filtering device and the rod body cylinder; a blind plate is provided around the filtering device, and the blind plate is adapted and fixed to the outer side surface of the rod body cylinder by welding; the area within the blind plate of the filtering device is adapted and designed with a filter layer; a filter layer flow channel is adapted and designed between the filter layer and the filtering device; the side wall of the rod body cylinder is adapted and designed with a rod body cylinder flow channel; the filter layer flow channel, the sandwich flow channel, and the rod body cylinder flow channel are adapted to correspond to each other and together constitute a filter flow channel; there are N filtering devices, and N≥1.

[0006] In one aspect of the present invention, preferably N≥3; wherein the shortest flow channel length of the interlayer flow channel is 0.1-20 mm, preferably 0.5-5 mm.

[0007] In one aspect of the present invention, the filter rod includes a rod body, which includes a rod body cylinder in the middle and filter rod joints at both ends, and the filter rod joints at both ends are provided with liquid outlet holes or only one end is provided with a liquid outlet hole; and / or, the filter device includes a filter layer, and the filter layer is a stainless steel fiber sintered felt or a stainless steel fiber sintered mesh, and the filter device is a stainless steel sintered felt combination filter device or a stainless steel sintered mesh combination filter device that does not require pre-coating of filter aid medium; the filter device includes a fixing plate, and the fixing plate is used to fix the filter layer and form the filter layer flow channel together with the filter layer; and / or, the filter device is welded and adapted to be fixed to the outer side surface of the rod body cylinder in a smooth and non-corrugated manner; and / or, the fixing plate is a frame plate or a porous plate.

[0008] In one aspect of the present invention, the rod body does not need to be fixed with reinforcing ribs; or, the rod body is a stainless steel cylindrical device, an inner cylinder is arranged on the inner wall of the rod body, the inner cylinder is a reinforcing rib, including a cylindrical grid composed of a plurality of metal spokes arranged evenly in a circle, the inner surface of the cylindrical grid is adapted to be welded with a plurality of circular reinforcing ribs and a plurality of axial reinforcing ribs, the axial reinforcing ribs are parallel to the metal spokes and perpendicular to the plane where the circular reinforcing ribs are located, the cylindrical grid, the circular reinforcing ribs and the axial reinforcing ribs are adapted to be welded together to form the inner cylinder.

[0009] The filter rod of the present invention is foldable or non-foldable, preferably non-foldable.

[0010] The present invention also provides a method for preparing a filter rod, comprising: preparing a rod body: selecting an adapted rod body cylinder and filter rod joints at both ends to assemble into a rod body; adapting and designing a rod body cylinder flow channel on the side wall of the rod body cylinder; preparing a filtering device: selecting a fixed plate with a blind plate around it and a filtering layer, adapting and fixing the filtering layer to the area within the blind plate of the fixed plate to form a filtering layer flow channel and obtain a filtering device; fully welding N of the filtering devices to the outer side surface of the rod body cylinder to form a sandwich flow channel and obtain the filter rod.

[0011] In one aspect of the present invention, the preparation of the filter layer includes selecting a matching filter layer and a fixing plate, placing the filter layer on the fixing plate, matching full-melt welding one side of the filter layer with the fixing plate to form a weld mark blind plate, welding the filter layer and the fixing plate into one, and obtaining the filter device; the curvature of the fixing plate is matched to the curvature of the outer side surface of the rod cylinder.

[0012] One aspect of the present invention includes welding a support mesh to a fixed plate before the filter layer is welded to the fixed plate, the support mesh being used to support the filter layer; or welding the support mesh to the fixed plate after the filter layer is welded to the fixed plate, sandwiching the filter layer between the fixed plate and the support mesh to protect the filter layer; or a combination of the two methods.

[0013] On the other hand, the technical personnel in the field of solid-liquid separation technology tend to pursue pleated filter elements based on the existing technology, because the pleated filter material itself can increase the filtration area. For example, the stainless steel fiber sintered felt can be made into a pleated shape for use as the filter layer of a filter rod or filter element. However, the present invention is based on the difference in basic concept, requiring the filter layer to be fitted and fixed to the outer surface of the rod cylinder in a smooth rather than pleated manner. The concept of the present invention is in the opposite direction or has greater technical obstacles to the existing technology. The present invention can be realized, wherein the key concept angle is the way the stainless steel fiber sintered felt itself is fitted and fixed and can be adapted to the smooth flow of a specific flow channel. The filter rod cylinder is sufficient to support the filter structure to maintain continuous filtration at a higher strength, and is easier to clean than pleated.

[0014] On the other hand, the technical personnel in the field of solid-liquid separation technology tend to pursue a multi-layer filter screen structure based on the existing technology. In order to achieve high-purity filtration, multiple layers of stainless steel fiber sintered felt or stainless steel particle sintered felt structures are set to increase the filtration thickness. However, the present invention is based on the difference in basic concepts, requiring the filter layer to be a stainless steel fiber sintered felt / mesh of a certain thickness to meet the working conditions, and to be adapted and fixed on the outer surface of the rod cylinder in a smooth rather than folded manner. The concept of the present invention is in the opposite direction or has a greater technical obstacle to the existing technology. Similarly, the present invention can be realized, wherein the key concept angle is the way in which the stainless steel fiber sintered felt itself is adapted and fixed, and can be adapted to the smooth flow of a specific flow channel. The filter rod cylinder is sufficient to support the filter screen structure to maintain continuous filtration at a higher strength, and is easier to clean than folded waves. If multiple layers are set, the adaptation welding method required by the present invention cannot be met, which is contrary to the concept of the present invention.

[0015] The present invention also provides a filtering device, comprising the filter rod as described above, preferably a candle filter rod.

[0016] The present invention also provides the application of the filter rod in various application scenarios, including solid-liquid separation of liquid food, such as solid-liquid separation and drying treatment of filtered residual liquid of wine, beverages, syrup, etc.; solid-liquid separation of industrial water, such as seawater purification, aquaculture manure treatment, nuclear wastewater treatment, river cleaning treatment, power plant and chemical plant wastewater treatment, separation and purification of new energy lithium battery material washing wastewater treatment; solid-liquid separation of domestic water, such as tap water purification, building pipe gallery water treatment, gardening greywater treatment, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the candle filter rod structure provided by the present invention.

[0019] Figure 2 A schematic diagram showing that the filter rod joints at both ends of the candle-type filter rod provided by the present invention have liquid outlet holes.

[0020] Figure 3 A schematic diagram showing that a filter rod connector at one end of a candle-type filter rod provided by the present invention has a liquid outlet.

[0021] Figure 4 A schematic diagram of the filter layer structure provided by the present invention.

[0022] Figure 5 This is a second schematic diagram of the filter layer structure provided by the present invention.

[0023] Figure 6 Schematic diagram of the filter layer structure provided by the present invention.

[0024] Figure 7 A schematic diagram of an exploded view of the filter layer structure provided by the present invention.

[0025] Figure 8 This is a schematic diagram of the internal structure of the inner cylinder provided by the present invention.

[0026] Fig. 9 This is a schematic diagram of the external structure of the inner cylinder provided by the present invention.

[0027] Fig.10 This is an enlarged schematic diagram of the filter layer flow channel structure provided by the present invention.

[0028] The figures are marked as: filter rod 1, rod body 2, rod body cylinder 21, filter rod joint 22, filtering device 3, interlayer flow channel 4, rod body cylinder flow channel 5, filter layer 6, fixing plate 7, filter layer flow channel 8, support net 9, inner cylinder 10, metal spokes 11, cylindrical grid 12, annular reinforcement ribs 13, shaft reinforcement ribs 14, weld mark blind plate 15. DETAILED DESCRIPTION

[0029] The technical scheme of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but it will be understood by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention. If specific conditions are not specified in the embodiments, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not specified in the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0030] If there is no special explanation, in the present invention, "the first aspect", "the second aspect", "the third aspect", "the fourth aspect", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "the first", "the second", "the third", "the fourth", etc. only serve the purpose of non-exhaustive enumeration and description, and it should be understood that they do not constitute a closed limitation on quantity.

[0031] If there is no special explanation, the "include" and "comprising" mentioned in the present invention represent open-ended or closed-ended expressions. For example, the "include" and "comprising" may represent that other components not listed may also be included or only the listed components may be included or only the listed components may be included.

[0032] If there is no special explanation, in the present invention, "one or more" or "at least one" refers to any one, any two or more of the listed items. Among them, "several" refers to any two or more of the listed items.

[0033] This specific embodiment provides a filter rod, including: a rod body cylinder 21, a filter device 3; an interlayer flow channel 4 is adapted and designed between the filter device 3 and the rod body cylinder 21; the filter device 3 has a blind plate around it, and the blind plate is adapted and fixed to the outer side surface of the rod body cylinder 21 by welding, and the area within the blind plate of the filter device 3 is adapted and designed with a filter layer 6, and a filter layer flow channel is adapted and designed between the filter layer 6 and the filter device 3, and a rod body cylinder flow channel 5 is adapted and designed on the side wall of the rod body cylinder 21, and the filter layer flow channel 8, the interlayer flow channel 4, and the rod body cylinder flow channel 5 are adapted to correspond to each other and together constitute a filter flow channel; there are N filter devices 3, and N≥1.

[0034] The rod cylinder 21 and the filter device 3 are adapted and fixed by welding, and the non-adapted and fixed area is a filter surface, which corresponds to the flow channel, wherein the shortest flow channel length of the interlayer flow channel is 0.1-20mm, 0.1-10mm, preferably 0.2-10mm, preferably 0.5-8mm, preferably 0.5-5mm.

[0035] Furthermore, in a specific embodiment, it also includes a rod body 2, wherein the rod body 2 includes a middle rod body cylinder 21 and filter rod joints 22 at both ends, and the filter rod joints 22 at both ends are provided with liquid outlet holes or only one end is provided with a liquid outlet hole; and / or, the filter device 3 includes a filter layer 6, and the filter layer 6 is a stainless steel fiber sintered felt or a stainless steel fiber sintered mesh, and the filter device 3 is a stainless steel sintered felt combination filter device or a stainless steel sintered mesh combination filter device that does not require pre-coating of filter aid medium; the filter device 3 includes a fixing plate 7, and the fixing plate 7 is used to fix the filter layer 6 and form the filter layer flow channel 8 together with the filter layer 6; and / or, the filter device 3 is welded and adapted to be fixed to the outer side surface of the rod body cylinder 21 in a smooth and non-corrugated manner; and / or, the fixing plate 7 is a frame plate or a porous plate.

[0036] Furthermore, the filter layer flow channel 8 is in the filter device 3, and the rod cylindrical flow channel 5 is in the rod cylinder 21. The filter layer flow channel 8 is adapted to the rod cylindrical flow channel 5. The adaptation design of the rod cylindrical flow channel 5 is, for example, a punching design is performed on the cylinder surface. The filter layer flow channel 8 refers to the non-welded adaptation area of ​​the filter device 3, which is determined by the aperture of the filter layer 6 in the filter device, such as a stainless steel fiber sintered mesh or a stainless steel fiber sintered felt, and a fixed module, such as a fixed plate 7, according to the adaptation working conditions.

[0037] Furthermore, the interlayer flow channel has a specific space and pressure, and has a tortuous or straight flow channel. The shortest distance from the filter layer flow channel to the rod body cylindrical flow channel is a straight line, and the non-shortest distance is a curve. In the present invention, the straight line, i.e., the shortest flow channel length, is defined as 0.1-20 mm, preferably 0.2-10 mm, preferably 0.3-8 mm, preferably 0.4-5 mm, preferably 0.5-5 mm, preferably 0.6-5 mm, preferably 0.8 mm-2 mm, preferably 0.9-1 mm.

[0038] A specific embodiment proposes a candle-type filter rod, comprising a rod body 2, wherein the rod body 2 includes a middle rod body cylinder 21 and filter rod joints 22 at both ends; and a filtering device 3, wherein the filtering device 3 is adapted to be fixed on the outer surface of the rod body cylinder 21; the filtering device 3 is a stainless steel sintered felt combined filtering device or a stainless steel sintered mesh combined filtering device that does not require pre-coating of a filter aid medium.

[0039] The size and wall thickness of the rod cylinder 21 are selected according to design requirements. The size of the cylinder device includes but is not limited to 30mm to 2000mm, and can be any one of 30mm, 80mm, 150mm, 300mm, 500mm, 800mm, 1000mm, 1100mm, 1200mm, 1300mm, 1400mm, 1450mm, 1500mm, 1600mm, 1700mm, 1800mm, and 2000mm; the wall thickness includes but is not limited to 2mm to 100mm, and can be any one of 2mm, 3mm, 4mm, 5mm, 6mm...100mm.

[0040] In this embodiment, the above-mentioned filter rod can be used in a vacuum drum filter, and the vacuum drum filter of this embodiment is not limited to the vacuum drum filter within the current application scope. After using the drum proposed in the present invention, the application scenarios of the vacuum drum filter will increase significantly. Due to the reason that language lags behind technological development, the vacuum drum filter involved in this article includes both the vacuum drum filter under the concept of the prior art and the application scenarios after the increase or new application scenarios. These added application scenarios may not be currently used by vacuum drum filters. When the solid-liquid separation device after using the drum of the present invention is used, it is within the scope of the vacuum drum filter involved in this article.

[0041] The present invention does not specifically limit the rod body. Considering the material suitable for the application scenario, a metal rod body is usually used, such as a stainless steel cylinder device. When the stainless steel cylinder body is thicker, no reinforcing ribs need to be added to the stainless steel cylinder body, and the rod body is the stainless steel cylinder device. When the stainless steel cylinder body is thinner, reinforcing ribs can be added according to actual needs.

[0042] The present invention does not limit the structure of the reinforcing ribs. Preferably, an inner cylinder 10 is provided as a reinforcing rib. The inner cylinder 10 includes a cylindrical grid 12 composed of a plurality of metal spokes 11 evenly arranged in a circle. The inner surface of the cylindrical grid 12 is adapted to be welded with a plurality of annular reinforcing ribs 13 and a plurality of axial reinforcing ribs 14. The axial reinforcing ribs 14 are parallel to the metal spokes 11 and perpendicular to the plane where the annular reinforcing ribs 13 are located. The cylindrical grid 12, the annular reinforcing ribs 13, and the axial reinforcing ribs 14 are adapted to be welded together to form the inner cylinder 10.

[0043] The filtration of the present invention needs to have the filtering ability in various application scenarios, and does not require pretreatment or pre-operation of the filter layer.

[0044] The filter device 3 is adapted and fixed on the outer surface of the cylinder of the rod body 2, which means that the filter device 3 and the rod body 2 can be combined and sealed, in which case the liquid filtered by the filter device 3 can all enter the rod body 2 through the flow channel provided on the rod body 2 for easy discharge.

[0045] Specifically, the filter device 3 is a stainless steel sintered felt combined filter device or a stainless steel sintered mesh combined filter device. The filter device 3 includes a filter layer 6 for solid-liquid separation; and a fixed plate 7 for fixing the filter layer 6. The fixed plate 7 is provided with flow holes as part of the filter layer flow channel 8. The liquid after solid-liquid separation through the filter layer 6 can adapt to flow through the filter layer flow channel 8.

[0046] As an embodiment of the present invention, the filter layer 6 is used in the filter device 3 to meet the requirement that the filter layer does not need to be pre-treated or pre-operated. There are certain requirements for the filter layer 6, such as strength requirements, and the convenience of adjusting filter layers 6 of different specifications according to various solid-liquid separation application scenarios. Preferably, the filter device 3 is a stainless steel sintered felt combined filter device or a stainless steel sintered mesh combined filter device.

[0047] As an embodiment of the present invention, the rod body 2 does not need to be fixed with reinforcing ribs; or, the rod body 2 is a stainless steel cylindrical device, and an inner cylinder 10 is arranged on the inner wall of the rod body 2, and the inner cylinder 10 is a reinforcing rib, including a cylindrical grid 12 composed of a plurality of metal spokes 11 evenly arranged in a circle, and the inner surface of the cylindrical grid 12 is adapted to be welded with a plurality of circular reinforcing ribs 13 and a plurality of axial reinforcing ribs 14, and the axial reinforcing ribs 14 are parallel to the metal spokes 11 and perpendicular to the plane where the circular reinforcing ribs 13 are located, and the cylindrical grid 12, the circular reinforcing ribs 13, and the axial reinforcing ribs 14 are adapted to be welded together to form the inner cylinder 10.

[0048] As an embodiment of the present invention, the fixing plate 7 is a porous plate or a frame plate. There are no holes around the two sides of the fixing plate 7. The area around the fixing plate 7 without holes is called a blind plate. The fixing plate is fixed to the filter layer 6. The fixing method is not limited, but it needs to meet the closed type fixing, that is, no liquid can flow out from the blind plate. Preferably, the filter layer 6 is connected to the fixing plate 7 by full welding, and the blind plate is evenly closed and welded to form a weld mark. A liquid flow channel is formed inside without a weld mark.

[0049] As an embodiment of the present invention, the filter device 3 is adapted to be fixed on the outer surface of the cylinder of the rod body 2. The fixing method has certain requirements, and also needs to satisfy that the fixed connection is a sealed connection, preferably full welding. Specifically, it refers to the other side of the fixed plate 7 of the filter device 3 welded to the filter layer 6, and the other side of the fixed plate 7 is adapted to be fixedly connected to the rod body 2, preferably full welding, more specifically, full welding on the outer surface of the cylinder of the rod body 2.

[0050] As an embodiment of the present invention, based on the spirit of the present invention, the filter device 3 is a stainless steel combined filter device that does not require pre-coating of filter aid media, specifically including common diatomaceous earth for filtering and purifying liquid foods such as wine and beverages, which does not require pre-coating. The stainless steel combined filter device refers to a mesh or felt structure with millimeter, micron, and nanometer filtering functions formed after sintering stainless steel wire. It should be noted that the stainless steel combined filter device is a combined device, which is determined by the filter layer 6 itself being a precision filtering material. The new stainless steel sintered filter material belongs to a fine filtering component. According to different actual application scenarios, the applicability to the actual application scenario can be determined by setting the pore size. Therefore, it contacts the liquid to be filtered and separated, directly or indirectly, and it itself needs to bear a certain impact force and can complete the filtering and separation task, so it needs to be made into a combined component.

[0051] As an embodiment of the present invention, the stainless steel combined filtering device includes being realized by setting the above-mentioned fixed plate 7, and can also be realized by other methods, but all of them must meet the requirements of adapting to different filtering scenarios and having a certain strength, maintaining integration, and easy sealing connection.

[0052] As an embodiment of the present invention, for the setting of the inner cylinder 9, if the rod body 2 itself has a certain strength and can meet the above requirements of bearing pressure, having strength, and being easy to seal, the inner cylinder 10 may not be provided. For example, if a cylindrical body made of a stainless steel plate with a certain thickness is used as the rod body 2, it is no longer required to provide the inner cylinder 10. However, if the rod body 2 itself is made of a thin plate, such as the rod body in the prior art, a reinforcing rib needs to be provided as the inner cylinder.

[0053] As an embodiment of the present invention, there is no specific restriction on the setting of the inner cylinder 10. Preferably, the inner cylinder 10 is set as a reinforcing rib. The inner cylinder 10 includes a cylindrical grid 12 composed of a plurality of metal spokes 11 evenly arranged in a circle. The metal spokes 11 can be set to a specific width as needed, and preferably have a length that matches the formed inner cylinder and the rod body 2. The material needs to be configured according to the actual application scenario. If the solid-liquid separation is liquid food, stainless steel or other corrosion-resistant edible grade materials need to be configured, such as 304 stainless steel, 316L stainless steel, corrosion-resistant ceramics, etc. When selecting a material that cannot be connected by welding, a suitable connection method needs to be selected. The cylindrical grille 12 can be arranged with gaps or closely arranged without gaps. The inner surface of the cylindrical grille 12 is welded with a plurality of circular reinforcement ribs 13 and a plurality of axial reinforcement ribs 14. The axial reinforcement ribs 14 are parallel to the metal spokes 11 and perpendicular to the plane where the circular reinforcement ribs 13 are located. The cylindrical grille 12, the circular reinforcement ribs 13, and the axial reinforcement ribs 14 are welded together to form the inner cylinder 10.

[0054] In one embodiment of the present invention, the flow channel is provided to conveniently separate and recycle the liquid after solid-liquid separation and enter the next process. Under normal working conditions, the interlayer flow channel 4 presents a laminar or turbulent flow form between the rod body 2 and the filter device 3. Preferably, the rod body cylindrical flow channel 5 is a punched hole, and the hole wall is sealed after mechanical processing and polishing, and no metal particles fall off. The interlayer flow channel 4 is adapted to correspond to the rod body cylindrical flow channel 5, that is, the separated liquid passes through the interlayer flow channel 4, passes through the rod body cylindrical flow channel 5, and then the liquid is extracted through the adapted pipeline.

[0055] As a specific embodiment of the present invention, the outer wall of the inner cylinder 10 is adapted to be welded to the inner surface of the rod body 2; As a specific embodiment of the present invention, the two ends of the rod body 2 are adapted to be connected with the end plate, flange, and pipeline; As a specific embodiment of the present invention, the filter device 3 and the rod body 2 are fitted and fixed at a closed full weld; As a specific embodiment of the present invention, the fixing plate 7 is an arc-shaped porous plate or an arc-shaped frame plate, and the other side of the fixing plate 7 is fully welded to the cylindrical outer surface of the rod body 2; As a specific embodiment of the present invention, the rod body cylindrical flow channel 5 is concave in the vicinity thereof; As a specific embodiment of the present invention, the aperture of the rod cylindrical flow channel 5 is larger than the aperture of the filter layer flow channel 8; As a specific embodiment of the present invention, the number of the rod cylindrical flow channels 5 is less than the number of the filter layer flow channels 8; As a specific embodiment of the present invention, the liquid after solid-liquid separation through the filter layer 6 flows through the filter layer flow channel 8, the interlayer flow channel 4, the rod cylindrical flow channel 5 and then enters the rod body 2 and is extracted through the adapter pipe; As a specific embodiment of the present invention, the filter layer 6 is a multi-purpose stainless steel sintered felt or a multi-purpose stainless steel sintered mesh; As a specific embodiment of the present invention, the pore size of the support mesh 9 is larger than the pore size of the filter layer 6; As a specific embodiment of the present invention, the surface of the filter layer 6 without welding marks is the filter surface, and the filter surface is a stainless steel sintered filter layer or stainless steel sintered filter felt surface with a millimeter or micron scale formed between multiple cross-point stainless steel fiber wires in a micro-melting state; As a specific implementation of the present invention, the weld mark blind plate 15 is a plate without through holes and without flow function.

[0056] On the other hand, one embodiment of the present invention further proposes a method for preparing a filter rod, including preparing a rod body 2: selecting a matching rod body cylinder 21 and filter rod joints 22 at both ends to assemble into a rod body 2; fitting a rod body cylinder flow channel 5 on the side wall of the rod body cylinder 21; preparing a filter device 3: selecting a fixed plate 7 with a blind plate around it and a filter layer 6, fitting and fixing the filter layer 6 in the area within the blind plate of the fixed plate 7 to form a filter layer flow channel 8 and obtain the filter device 3; fully welding N of the filter devices 3 to the outer side surface of the rod body cylinder 21 to form a sandwich flow channel 4 and obtain the filter rod.

[0057] As a specific implementation method, an adapted filter layer 6 and a fixed plate 7 are selected, and the filter layer 6 is placed on the fixed plate 7. One side of the filter layer 6 is adapted to be fully melt-welded with the fixed plate 7 to form a weld mark blind plate 15, and the filter layer 6 and the fixed plate 7 are welded together to obtain the filter device 3; the curvature of the fixed plate 7 is adapted to the curvature of the outer side surface of the rod cylinder 21.

[0058] As a specific implementation manner, before the filter layer 6 is welded to the fixed plate 7, the support net 9 is first welded to the fixed plate 7, and the support net 9 is used to support the filter layer 6; or, after the filter layer 6 is welded to the fixed plate 7, the support net 9 is welded to the fixed plate 7, and the filter layer 6 is sandwiched between the fixed plate 7 and the support net 9 to protect the filter layer 6; or a combination of the two methods.

[0059] Preferably, an inner cylinder 10 is arranged on the inner wall of the rod body 2, and the inner cylinder 10 is a reinforcement rib, including a cylindrical grid 10 composed of a plurality of metal spokes 11 evenly arranged in a circle, and the inner surface of the cylindrical grid 10 is adapted to be welded with a plurality of circular reinforcement ribs 13 and a plurality of axial reinforcement ribs 14, and the axial reinforcement ribs 14 are parallel to the metal spokes 11 and perpendicular to the plane where the circular reinforcement ribs 12 are located, and the cylindrical grid 12, the circular reinforcement ribs 13, and the axial reinforcement ribs 14 are adapted to be welded together to form the inner cylinder 10.

[0060] The above implementation mode first provides a new filter rod, which can be applied to a rotary drum filter and can be used directly without pre-coating of a filter aid medium; secondly, the solid-liquid separation efficiency is greatly improved, because the stainless steel combined filter device as a filter layer has very high strength and can be used under relatively large flow requirements; thirdly, the usage scenarios are increased, and filters with different pore sizes can be selected according to actual needs. It can also be used for solid-liquid separation of various liquid foods, such as solid-liquid separation and drying treatment of filtered residual liquids such as wine, beverages, and syrups; solid-liquid separation of various industrial waters, such as seawater purification, nuclear wastewater treatment, river cleaning treatment, power plant and chemical plant wastewater treatment, and separation and purification of new energy lithium battery material washing wastewater treatment; solid-liquid separation of various domestic waters, such as tap water purification, building corridor water treatment, and gardening grey water treatment.

[0061] Furthermore, the rod body 2 is connected to the filter device 3 at the fitting and fixing part, and an adaptable interlayer flow channel 4 is designed between the rod body 2 and the filter device 3 at the non-fitting and fixing part. The interlayer flow channel 4 provides a channel for the fluid to flow out conveniently, thereby improving the working efficiency of the vacuum drum filter. A rod body cylindrical flow channel 5 is provided on the rod body, specifically, it is provided on the cylinder body, and the interlayer flow channel 4 is adapted to correspond to the rod body cylindrical flow channel 5, and is used to discharge the liquid after solid-liquid separation. The number of rod body cylindrical flow channels 5 is determined by the actual filtering needs and the pore size of the filter layer. This design is coordinated with the filter layer as a filter device. If there are too many rod body cylindrical flow channels 5, under the condition of a certain vacuum degree, the filter layer may be subjected to suction that exceeds the tolerance level, which has a certain impact on the filter layer. If there are too few rod body cylindrical flow channels 5, liquid accumulates in the interlayer flow channel 4 after filtration, which will cause the flow channel to bulge, and will also affect the filter layer. Therefore, an adaptive interlayer flow channel 4 is designed between the rod body 2 and the filter device 3 at the non-adaptive fixed position; the rod body 2 is provided with a rod body cylindrical flow channel 5, and the interlayer flow channel 4 is adaptively matched with the rod body cylindrical flow channel 5, which is a manifestation of synergistic effect.

[0062] Based on the same spirit as above, the fixed plate 7 is provided with flow holes as part of the filter layer flow channel 8, and combined with the distance between the filter layer 6 and the fixed plate 7, the filter layer flow channel 8 is constituted together. The liquid after solid-liquid separation through the filter layer 6 can adapt to flow through the flow channel 8, and the solid-liquid separation scenario and flow rate used are synergistic with the number and size of the flow channels 8. Furthermore, there is synergy between the synergy here and the adaptation and synergy between the above-mentioned interlayer flow channel 4 and the rod cylindrical flow channel 5.

[0063] One of the specific implementations of the present invention, in this embodiment, one, two, three, four, five, six or seven pieces of adaptive filter layers 6 and fixing plates 7 are provided, or more filter layers 6 and fixing plates 7 can be provided. One piece is a whole cylinder, two pieces are a semi-cylindrical structure, three pieces are a cylindrical structure with a circular arc of 120 degrees, four pieces are a cylindrical structure with a circular arc of 90 degrees, and so on, but not limited to an even distribution.

[0064] One of the specific embodiments of the present invention is to arrange the rod body 2 and the filter device 3 to be adapted and fixed in a closed full-weld manner, which is a basic condition to ensure that the flow channel and the flow channel holes can smoothly transport the liquid, ensure the smooth flow of the fluid under a certain amount of conditions, and can be suitable for working under large flow conditions, thereby improving the filtration efficiency.

[0065] The outer wall of the vacuum inner cylinder 10 is welded to the inner surface of the rod body 2, and the two walls are sealed and connected to form a whole; the two ends of the rod body 2 are connected to the end plate, flange, pipeline or the rod body 2 is embedded or embedded in a suitable filtering system to ensure fluid discharge; the filter device 3 and the rod body 2 are fixed at the closed full welding, which changes the existing filter rod structure, including the existing vacuum drum filter drum structure, expands the application scene, improves the filtering performance, and avoids pre-coating of the filter medium; the fixed plate 7 is an arc-shaped porous plate or frame plate, and the fixed plate 7 is a curved porous plate or frame plate. The other side of the fixed plate 7 is fully welded to the cylindrical outer surface of the rod body 2. The arc-shaped fixed plate is designed to adapt to the cylindrical curvature of the rod structure to achieve better adaptability. One side of the fixed plate 7 is welded to the filter layer, and the other side is welded to the cylindrical body of the rod body 2, which ensures the integrated structure of the filter device 3 and the rod body 2, improves the firmness, greatly prolongs the service life, organically combines the filter layer with the rod body, and creatively proposes a new type of drum structure; it is concave near the cylindrical flow channel 5 of the rod body, which improves the collection and convergence efficiency of the fluid in the flow channel and ensures the stability of the fluid state. Qualitatively, the laminar flow state is maintained to the maximum extent under laminar flow conditions, thereby improving the passing efficiency of the fluid; the aperture of the rod body cylindrical flow channel 5 is larger than the aperture of the filter layer flow channel 8, the number of the rod body cylindrical flow channels 5 is smaller than the number of the filter layer flow channels 8, the aperture of the support net 9 is larger than the aperture of the filter layer 6, and the design of these apertures and numbers is designed according to actual working conditions, and has a synergistic effect, which will not be repeated; the liquid after solid-liquid separation through the filter layer 6 flows through the filter layer flow channel 8, the interlayer flow channel 4, and the rod body cylindrical flow channel 5, and then enters the rod body 2, and is extracted through the adapter pipe, providing a complete flow channel; the filter layer 6 is a multi-purpose stainless steel sintered felt or a multi-purpose stainless steel sintered mesh, which ensures strength. If 304 or 316L stainless steel is used, it can be suitable for filtering and purifying liquid food; the surface of the filter layer 6 without weld marks is the filter surface, and the filter surface is a millimeter-level, micron-level or nanometer-level stainless steel sintered filter layer or stainless steel sintered filter felt surface formed between multi-point crossed stainless steel fiber wires in a micro-melting state, which improves the filtration accuracy and expands the field of use; the weld mark blind plate 15 is a non-through-hole plate without flow function to ensure the sealing of the flow channel.

[0066] In one embodiment of the present invention, technicians in the field of solid-liquid separation technology tend to pursue pleated filter elements based on the existing technology, because the pleated filter material itself can increase the filtration area. For example, the stainless steel fiber sintered felt can be made into a pleated shape for the filter layer of the filter rod or filter element. The present invention is based on the difference in basic concept, requiring the filter layer to be adapted and fixed to the outer surface of the rod cylinder in a smooth rather than pleated manner. The concept of the present invention is in the opposite direction or has a large technical obstacle to the existing technology. The present invention can be realized, wherein the key concept angle is the way in which the stainless steel fiber sintered felt itself is adapted and fixed and can be adapted to the smooth flow of a specific flow channel. The filter rod cylinder is sufficient to support the filter screen structure to maintain continuous filtration at a higher strength, and it is easier to clean than pleated. On the other hand, the present invention, technicians in the field of solid-liquid separation technology tend to pursue a multi-layer filter screen structure based on the existing technology. In order to achieve high-purity filtration, a multi-layer stainless steel fiber sintered felt or stainless steel particle sintered felt structure is set to increase the filtration thickness. The present invention is based on a different basic concept. It requires that the filter layer be fixed to the outer surface of the rod cylinder in a smooth rather than folded manner with a stainless steel fiber sintered felt / mesh of a certain thickness to meet the working conditions. The concept of the present invention is in the opposite direction or has a greater technical barrier to the prior art. Similarly, the present invention can be realized, where the key concept angle is the way the stainless steel fiber sintered felt itself is fixed and can be adapted to the smooth flow of a specific flow channel. The filter rod cylinder is sufficient to support the filter screen structure to maintain continuous filtration at a higher strength, and it is easier to clean than folded. If multiple layers are set, the adaptation welding method required by the present invention cannot be met, which is contrary to the concept of the present invention.

[0067] Compared with the pleated filter rod or filter element, the filter rod or filter element of the present invention has the characteristics of smooth pores, easy cleaning, temperature resistance, corrosion resistance, no falling wire mesh, and continuous filtration under the condition of using the same filter material, such as stainless steel fiber sintered mesh. However, the pores of the pleated filter rod or filter element are not smooth enough, and although the filtration area is increased, the filtration efficiency is slightly lower than that of the present invention, and the pleated filter rod is not easy to clean and is easy to clog, and the corrosion resistance is slightly worse due to the folds, and the wire mesh is easy to fall off, and the regeneration ability is slightly poor.

[0068] In addition, it should be emphasized that the present invention does not pursue the filter layer of the filter rod itself to have a strong dirt holding capacity, as long as the filter layer is ensured to meet the filtering standards under relatively large temperature and pressure conditions. First, the outer surface of the filter layer of the filter rod of the present invention is smooth and free of folds, which makes it easy to remove the outer filter material, and the inner layer is also easy to clean and regenerate. Secondly, the present invention is also applicable to the scene of liquid circulation flow filtration, and the flowing liquid itself can regenerate the filter layer.

[0069] The following table shows the approximate parameters of the filter rod of the present invention compared with the pleated filter rod of the same filter material (316L stainless steel fiber sintered felt), the three-layer filter layer cylindrical filter rod, the one-layer filter layer cylindrical filter rod, and the PE membrane filter rod.

[0070]

[0071] The candle filter rod of the present invention has better performance than existing ordinary cylindrical filter rods, pleated filter rods, and membrane filter elements, and has a wide range of applications, a wide range of applicable temperatures, and a wide range of applicable pressures. Membrane filtration, pleated filtration, or multi-layer filtration may also be reinforced with some adhesives, so that its use temperature and pressure are limited, and there are safety hazards. For the present invention, thanks to the adaptation method of the filter layer and the rod body and the filter material structure of the present invention, it can be used in various working conditions and the filtration efficiency is significantly improved. The connection methods of the candle filter rod of the present invention include but are not limited to: quick interface connection for standard interfaces (such as 222, 220, 226), threaded connection, flange connection, pull rod connection, special customized interface, etc.

[0072] As a specific embodiment 1 of the present invention, in a liquor production workshop, the filtered liquor is processed using a candle filter rod filter, such as Figure 1-2 As shown, the filter rod 1 of the present invention is first prepared. Specifically, a stainless steel sintered felt is selected as the filter material, and its pore size is micron-level, such as Figure 7 As shown, the stainless steel sintered felt 6 is placed on the fixed plate 7, and a welding blind plate 15 is reserved around one side of the fixed plate 7. The stainless steel sintered felt 6 is fully melted and welded to the welding blind plate 15 of the fixed plate 7 by laser welding technology, achieving adaptive sealing full welding. The non-adaptive sealing welding area is a fluid flow channel, such as Fig.10 As shown, a filter layer flow channel 8 is provided on the fixed plate 7, and the fluid passes through the filter layer flow channel 8, as shown in FIG. Figure 7 As shown in the figure, a filter device 3 is prepared; a rod body 2 is selected, and the rod body 2 is adapted to the vacuum drum filter. A 316L stainless steel cylinder is set as the rod body 2. Since the cylinder in this embodiment is thicker and can withstand a larger pressure range, the vacuum suction will not suck it flat and deform it under extreme working conditions. Punching and grinding are performed on it and the hole wall is sealed to ensure that no particles fall off. In this embodiment, four 1 / 4 filter devices 3 and four fixing plates 7 are set. For the convenience of display, this embodiment uses a flat filter layer 6 and a fixing plate 7, such as Figure 7As shown, the filter layer 6 and the fixing plate 7 are relatively easy to be formed with an adaptive curvature on the rod body 2 by welding. Of course, the filter layer 6 and the fixing plate 7 with a preset curvature can also be welded together; the other side of the fixing plate 7 of the filter device 3 is welded to the outside of the 316L stainless steel cylinder of the rod body 2, that is, the surface of the rod body 2. In order to protect the filter layer 6 from the impact of the wine body or the influence of large particles of foreign matter in the wine body, a support net 9 is provided, and the support net 9 is welded to the fixing plate 7, and the filter layer 6 is sandwiched between the fixing plate 7 and the support net 9, as shown in FIG. Figure 4 As shown, it is used to protect the filter layer, of course, it can also be used as Figure 5 As shown, the protective support net 9 of the outer layer of the filter layer 6 is retained, and it can also be as Figure 6 As shown, the support net 9 is placed between the filter layer 6 and the fixed plate 7; a filter layer flow channel 8 is opened on the fixed plate 7, as shown in FIG. Fig.10 As shown, it can be used as a flow hole or as an adapting flow channel between the filter layer and the fixed plate; the rod body 2 and the filter device 3 are connected at the adapting fixed position, and an adapting sandwich flow channel 4 is designed between the rod body 2 and the filter device 3 at the non-adapting fixed position, as shown in FIG. Fig.10 As shown; the rod body 2 is provided with a rod body cylindrical flow channel 5, and regular depressions are set within a distance with a radius of 3-30 microns near the rod body cylindrical flow channel 5, which are depressions with a gentle slope, thereby improving the rapid gathering of the wine in the flow channel to the rod body cylindrical flow channel 5. The interlayer flow channel 4 is adapted to correspond to the rod body cylindrical flow channel 5 and is used to discharge the liquid after solid-liquid separation. When using the vacuum drum filter, there is no need to pre-coat the drum surface with diatomaceous earth, and a soilless filtering device is suitable, which highlights the technological advancement. The elimination of diatomaceous earth has brought significant environmental and social benefits.

[0073] Embodiment 2 is different from the above-mentioned embodiment 1 in that an inner cylinder 10 is provided on the inner wall of the rod body 2, as shown in Figures 8-9, the inner cylinder 10 is a reinforcing rib, including a cylindrical grid 12 composed of a number of metal spokes 11 arranged evenly in a circle, the inner surface of the cylindrical grid 12 is adapted to be welded with a number of circular reinforcing ribs 13 and a number of shaft reinforcing ribs 14, the shaft reinforcing ribs 14 are parallel to the metal spokes 11 and perpendicular to the plane where the circular reinforcing ribs 13 are located, the cylindrical grid 12, the circular reinforcing ribs 13, and the shaft reinforcing ribs 14 are adapted to be welded together to form the inner cylinder 10, and the rod body 2 using the inner cylinder 10 is more solid. The difference from embodiment 1 is that the filtering device is a candle-type filter rod filter, which is used for the purification of sludge-containing wastewater, and the pore size of the filter layer 6 used is micron-level, and the purified water meets the national environmental protection requirements, creating great social benefits.

[0074] Embodiment 3 is different from the above-mentioned embodiment 1 in that two filter devices 3 are provided, and the inner cylinder 10 is not provided, and the filter device 3 is also not provided with a support net 9. First, the filter rod 1 of the present invention is prepared, specifically, a stainless steel sintered mesh is selected as the filter material, and its pore size is in the micron level. Other preparation processes are as in embodiment 1. It is used in a purification treatment line of a petroleum refinery wastewater treatment plant. The purified wastewater is clean and transparent, and meets national emission standards and industry standards, including the petroleum refining industry pollutant emission standard GB 31570-2015 and the comprehensive sewage emission standard GB 8978 and the surface water environmental quality standard GB3838-2002, etc., and has achieved significant economic and social benefits.

[0075] Embodiment 4 is different from the above-mentioned embodiment 3 in that a support net 9 is provided in the filter device 3, and three fixing plates 7 adapted to the three filter devices 3 are provided. Other preparation processes are as in embodiment 1. In an electronics factory, it is used for the treatment of electronic industrial wastewater and new energy lithium-ion battery material wastewater, respectively, and both have achieved the treatment target value and expected effect. After testing, it is fully in line with national standards including the electronic industry water pollutant emission standard GB 39731-2020 and the comprehensive sewage discharge standard GB 8978, as well as the battery industry pollutant emission standard GB 30484-2013 and the comprehensive sewage discharge standard GB 8978, and has achieved significant economic and social benefits.

[0076] In Example 5, a matching rod cylinder 21 and a joint 22 are selected as the rod body; a stainless steel sintered filter screen is used as the filter device 3 that does not require pre-coating of a filter aid medium. The preparation of the filter device 3 is as in Example 4 above. The filter device 3 is adapted and fixed on the outer surface of the cylinder of the rod body 2. The rod body 2 and the filter device 3 are connected at the adapted fixed position. An adapted interlayer flow channel 4 is designed between the rod body 2 and the filter device 3 at the non-adapted fixed position. A rod body cylindrical flow channel 5 is arranged on the rod body 2. The interlayer flow channel 4 corresponds to the rod body cylindrical flow channel 5 and is used for the filtering of liquor in a liquor factory. The difference from Example 4 above is that the specific dimensions of the cylindrical device are selected as follows: the length is 1500 mm and the wall thickness is 30 mm. Figure 3 As shown, a liquid outlet hole is provided at one end of the candle filter rod joint. The diameter of the rod body cylindrical flow channel 5 of the cylindrical device is φ8, and the hole spacing of the rod body cylindrical flow channel 5 is 16mm. It is used to discharge the wine after solid-liquid separation, and there is no need to pre-coat the surface of the filter rod with diatomaceous earth. The soil-free pressure-stabilizing wine filtering device is applicable. The filtered wine is cool and transparent, and it is qualified after tasting. Various physical and chemical indicators are excellent, showing the advanced technology, which has brought significant economic and social benefits to the wine blending and storage workshop.

[0077] Specific implementations will not be given one by one. For ordinary technicians in this field, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention, including, for example, the position and setting of the support net, etc. The various solutions of the present invention are understood by combining the inventive concept with specific embodiments. Through the technical solution of the present invention, a filter rod overall structure in which stainless steel sintered felt or sintered net is adapted to the outer surface of the rod cylinder is provided, which is convenient for use in various filtering devices, and solves the problem that various types of filters in the prior art have limited and fixed application scenarios. The present invention achieves a better solid-liquid separation effect, and is a technical effect beyond the expectations of those skilled in the art.

[0078] The filter rod of the filtering device of the present invention does not need to be pre-coated with a filter aid medium, and reaches a negative pressure to enter the working state, which saves non-renewable resources such as diatomaceous earth and creates economic benefits. Furthermore, the filter machine using the new candle filter rod can be used in any solid-liquid separation scenario, and can conveniently adapt the filter layer aperture according to the working conditions, and whether to install the inner cylinder reinforcement ribs and support protection net, which greatly expands the scope of use of the vacuum filter. Furthermore, since it can use a larger stainless steel combination device, a larger candle filter rod can also be designed, and the generation of negative pressure conditions is easy to achieve, so this directly improves the filtration efficiency. Under the same working conditions, the solid-liquid separation efficiency of a single candle filter rod filter is improved by at least 30%, and a small winery can save about 500,000 yuan in pre-coated filter aid media each year, and the service life of the stainless steel combination device as a filter layer is increased by at least 3 times as a whole. At the same time, it can also promote the improvement of the quality of liquid food production and the improvement of food safety, and there will be no plasticizers, metal particles falling off and other undesirable substances mixed in, avoiding the problems of traditional vacuum filters. Similarly, using it in the field of non-liquid food can also achieve significant economic and social benefits.

[0079] The filter rod of the present invention, such as a candle-type filter rod, can also be applied to other mechanical devices to meet their use requirements. In addition, the solid-liquid separation device or filter using the filter rod of the present invention can basically be applied to all solid-liquid separation scenarios, and is used to purify, extract and filter liquids, including solid-liquid separation of various liquid foods, such as solid-liquid separation and drying treatment of filtered residual liquids such as wine, beverages, and syrups; solid-liquid separation of various industrial waters, such as seawater purification, nuclear wastewater treatment, river cleaning treatment, power plant and chemical plant wastewater treatment, and separation and purification of new energy lithium battery material washing wastewater treatment; solid-liquid separation of various domestic waters, such as tap water purification, building corridor water treatment, gardening greywater treatment, etc.

[0080] The filter rod of the present invention and the filtering device using the filter rod of the present invention, the use and preparation method, and all embodiments of their application, including the technical features of the embodiments, can be arbitrarily combined. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A filter rod, characterized in that: include: A rod body cylinder (21); a filtering device (3); an interlayer flow channel (4) is adapted and designed between the filtering device (3) and the rod body cylinder (21); The filter device (3) has a blind plate around its periphery, the blind plate being adapted and fixed to the outer side surface of the rod cylinder (21) by welding, the area within the blind plate of the filter device (3) being adapted and designed with a filter layer (6), a filter layer flow channel being adapted and designed between the filter layer (6) and the filter device (3), a rod cylinder flow channel (5) being adapted and designed on the side wall of the rod cylinder (21), the filter layer flow channel (8), the interlayer flow channel (4), and the rod cylinder flow channel (5) being adapted and corresponding to each other and jointly constituting a filter flow channel; The number of the filtering devices (3) is N, where N≥1. Preferably, N≥3.

2. The filter rod according to claim 1, characterized in that include: A rod body (2), the rod body (2) comprising a rod body cylinder (21) in the middle and filter rod joints (22) at both ends, the filter rod joints (22) at both ends being provided with liquid outlet holes or only one end being provided with a liquid outlet hole; and / or, The filter device (3) comprises a filter layer (6), the filter layer (6) is a stainless steel fiber sintered felt or a stainless steel fiber sintered mesh, and the filter device (3) is a stainless steel sintered felt combined filter device or a stainless steel sintered mesh combined filter device that does not require pre-coating of a filter aid medium; the filter device (3) comprises a fixing plate (7), the fixing plate (7) is used to fix the filter layer (6) and to form the filter layer flow channel (8) together with the filter layer (6); and / or, The filtering device (3) is welded and fixed to the outer side surface of the rod cylinder (21) in a smooth and non-corrugated manner; and / or the fixing plate (7) is a frame plate or a porous plate.

3. The filter rod according to claim 2, characterized in that The rod body (2) does not need to be fixed by reinforcing ribs; or, the rod body (2) is a stainless steel cylindrical device, an inner cylinder (10) is arranged on the inner wall of the rod body (2), the inner cylinder (10) is a reinforcing rib, comprising a cylindrical grid (12) composed of a plurality of metal spokes (11) evenly arranged in a circular shape, the inner surface of the cylindrical grid (12) is welded with a plurality of circular reinforcing ribs (13) and a plurality of axial reinforcing ribs (14), the axial reinforcing ribs (14) are parallel to the metal spokes (11) and perpendicular to the plane where the circular reinforcing ribs (13) are located, and the cylindrical grid (12), the circular reinforcing ribs (13) and the axial reinforcing ribs (14) are welded together to form the inner cylinder (10).

4. A method for preparing a filter rod, characterized in that: include, Preparation of the rod body (2): Selecting a suitable rod body cylinder (21) and filter rod connectors (22) at both ends, and assembling the rod body (2); A rod cylinder flow channel (5) is adaptively designed on the side wall of the rod cylinder (21); Preparation of a filter device (3): selecting a fixed plate (7) having a blind plate around it and a filter layer (6), fitting and fixing the filter layer (6) in an area within the blind plate of the fixed plate (7), forming a filter layer flow channel (8) and obtaining the filter device (3); N filtering devices (3) are fully welded to the outer side surface of the rod body cylinder (21) to form an interlayer flow channel (4) and obtain the filter rod.

5. The preparation method according to claim 4, characterized in that: The preparation of the filter layer (3) comprises: Selecting a matching filter layer (6) and a fixing plate (7), placing the filter layer (6) on the fixing plate (7), performing matching full-melt welding on one side of the filter layer (6) and the fixing plate (7) to form a weld mark blind plate (15), and welding the filter layer (6) and the fixing plate (7) together to obtain the filter device (3); the curvature of the fixing plate (7) is matched to the curvature of the outer side surface of the rod cylinder (21).

6. The preparation method according to claim 5, characterized in that: include, Before the filter layer (6) is welded to the fixing plate (7), a support net (9) is first welded to the fixing plate (7), wherein the support net (9) is used to support the filter layer (6); or, After the filter layer (6) is welded to the fixed plate (7), the support net (9) is welded to the fixed plate (7), and the filter layer (6) is sandwiched between the fixed plate (7) and the support net (9) to protect the filter layer (6); or a combination of the two methods.

7. The preparation method according to any one of claims 4 to 6, characterized in that: comprising at least one of the following features (A) to (H), (A) The number of the filtering devices (3) is 1 to 15, preferably 2 to 6, more preferably 3 to 5; (B) the fixing plate (7) is an arc-shaped porous plate or an arc-shaped frame plate, and the other side of the fixing plate (7) is fully welded to the cylindrical outer side surface of the rod body (2); (C) a concave shape is present near the rod cylindrical flow channel (5); (D) The liquid passes through the filter layer flow channel (8), the interlayer flow channel (4), and the rod cylindrical flow channel (5) and then enters the rod body (2) and is extracted through the adapter pipe; (E) The filter layer (6) is a multi-purpose stainless steel fiber sintered felt or a multi-purpose stainless steel fiber sintered mesh; (F) The surface of the filter layer (6) without welding marks is the filter surface, and the filter surface is a stainless steel sintered filter surface or a stainless steel sintered filter felt surface with a millimeter or micrometer scale formed by multiple cross-point stainless steel fiber wires in a micro-melting state; (G) The weld mark blind plate (15) is a plate without through holes and without flow function; (H) The length of the rod cylinder (21) is 30 mm to 10 m, and the wall thickness is 3 mm to 100 mm.

8. A filtering device, characterized in that: The invention comprises a candle filter rod according to any one of claims 1 to 2 or a candle filter rod obtained by the preparation method according to any one of claims 3 to 6.

9. The filtering device according to claim 8, characterized in that It includes one or more filters such as candle filters, drum filters, vertical filters, etc.

10. Application of the filtering device according to claim 9 in the field of solid-liquid separation, characterized in that: The solid-liquid separation field includes: liquid food purification, industrial wastewater filtration and treatment, and domestic water purification.

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