Filter media sheet and filter media mass

Abstract

The utility model discloses a filter medium sheet and a filter medium cluster, the filter medium sheet comprises a wave-shaped filter sheet and a plane filter sheet, the wave-shaped filter sheet is provided with a plurality of wave crests and wave troughs which are alternately arranged, and the plane filter sheet is provided with a plurality of plane filter sheets. The wave crests and the wave troughs extend from the first end to the second end of the wave-shaped filter sheet; the wave troughs of the wave-shaped filter sheet and the plane filter sheet are fused and welded together, the wave-shaped filter sheet and the plane filter sheet are pressed near the first end to form a pressing part, and the pressing part is fused and welded to form a pressing closed end through which fluid cannot pass. According to the filtering medium sheet and the filtering medium group disclosed by the utility model, the glue consumption between the two layers of sheets is reduced, the manufacturing cost is reduced, the product weight is reduced, the utilization rate of the filtering medium is improved, and the service life of the filtering medium is prolonged.

Description

Technical Field

[0001] The utility model relates to a filter medium sheet for separating dust or impurities in a fluid (air, fuel or oil), and a filter medium mass composed of multiple sheets. Background Art

[0002] Air usually contains pollutants such as dust, and fuel or oil also contains pollutants such as impurities. In many cases, it is desired to filter out some or all of these pollutants from the fluid stream. For example, dust may be carried by air into the internal combustion engine of a motor vehicle or a power generation device, and such systems preferably remove or reduce the content of selected pollutants (e.g., particulate pollutants) from the air.

[0003] In order to reduce pollutants, a variety of fluid filter media have been developed. For example, Chinese invention patent CN101306277B of Donaldson Company discloses a trough-shaped filter medium and its manufacturing process, which includes: (a) a trough-shaped thin plate of the filter medium, which includes corrugated crests and troughs; (b) a panel of the filter medium bonding the trough-shaped thin plate, and multiple troughs extend therebetween; (c) the multiple troughs extend between the trough-shaped thin plate and the panel, including a regular folding structure sealing the multiple troughs so that unfiltered air cannot pass through. The regular folding structure includes at least two folds, and the at least two folds include inverted crests obtained by inverting the crests of the trough-shaped thin plate and the remaining part of the crests of the folded trough-shaped thin plate. The above structure is a classic case of a trough-shaped filter medium and has played a huge role in promoting the development of air filters. However, many deficiencies are still found in use, which are at least reflected in the following two aspects: First, the two sheets of the filter medium are bonded with glue, and the folding structure is also bonded and fixed with glue to form a folded closed end. Therefore, the amount of glue used is large, which not only increases the manufacturing cost, but also increases the product weight and wastes resources; Second, when bonding between the corrugated thin plate and the non-corrugated thin plate, the contact area is large, reducing the utilization rate of the filter material and affecting the service life of the filter element.

[0004] In particular, with the emission upgrade of National VI for roads and National IV for non-road vehicles, the whole vehicle and the whole machine have put forward higher requirements for the space and maintenance cycle of air filters. Users need a product with a small structure volume, low intake resistance, higher dust holding capacity and a longer maintenance cycle. Summary of the Utility Model

[0005] In view of this, the first technical problem to be solved by the utility model is to provide a filter medium sheet, which reduces the manufacturing cost, lightens the product weight and saves resources by reducing the amount of glue used.

[0006] As the same concept, the second technical problem to be solved by the present utility model is to provide a filter medium mass, which is composed of laminating or winding the above-mentioned filter medium sheets.

[0007] To solve the above first technical problem, the technical solution adopted by the present utility model is: a filter medium sheet, comprising: a corrugated filter sheet and a flat filter sheet, the corrugated filter sheet having a plurality of alternately arranged peaks and valleys, the peaks and the valleys extending from a first end to a second end of the corrugated filter sheet; the valleys of the corrugated filter sheet are melt-welded to the flat filter sheet, and the corrugated filter sheet and the flat filter sheet are pressed together near the first end to form a pressed portion, and the pressed portion is melt-welded into a pressed closed end through which fluid cannot pass.

[0008] Wherein, along the extending direction of the valleys, the corrugated filter sheet and the flat filter sheet are intermittently melt-welded together, and the non-melt-welded portions are separated from contact during use to form flow gaps.

[0009] Wherein, the bottom of the valleys is provided with outwardly protruding valley protrusions, the valley protrusions extend along the extending direction of the valleys and are intermittently arranged, and the valley protrusions are melt-welded to the flat filter sheet, and flow gaps are formed between two adjacent valley protrusions.

[0010] Wherein, the top of the peaks is provided with outwardly protruding peak protrusions, the peak protrusions extend along the extending direction of the peaks and are intermittently arranged, and flow gaps are formed between two adjacent peak protrusions.

[0011] Wherein, at least one peak of the corrugated filter sheet is pressed concave to form two short peaks, and the two short peaks are pressed and tilted to the same side.

[0012] As the same concept, to solve the above second technical problem, the technical solution adopted by the present utility model is: a filter medium mass, which is formed by winding or laminating filter medium sheets, the filter medium sheets comprising a corrugated filter sheet and a flat filter sheet, the corrugated filter sheet having a plurality of alternately arranged peaks and valleys, the peaks and the valleys extending from a first end to a second end of the corrugated filter sheet; the valleys of the corrugated filter sheet are melt-welded to the flat filter sheet, and the corrugated filter sheet and the flat filter sheet are pressed together near the first end to form a pressed portion, and the pressed portion is melt-welded into a pressed closed end through which fluid cannot pass, and a sealant blocking section through which fluid cannot pass is provided near the second end between the peaks of the corrugated filter sheet and another flat filter sheet, and the filter medium mass forms alternately arranged inflow channels and outflow channels through the pressed closed end and the sealant blocking section.

[0013] After adopting the above technical solution, the utility model has achieved the following technical effects:

[0014] (1) In the utility model, since the troughs of the corrugated filter sheet are melt-welded to the flat filter sheet, the corrugated filter sheet and the flat filter sheet are pressed together near the first end to form a pressed portion, and the pressed portion is melt-welded into a pressed closed end through which fluid cannot pass. Compared with the prior art, the amount of glue used between the two sheets is reduced, the manufacturing cost is lowered, the product weight is reduced, and resources are saved.

[0015] (2) In the utility model, the corrugated filter sheet and the flat filter sheet are intermittently melt-welded together, and the non-melt-welded parts are separated from each other during use to form fluid passing gaps. These fluid passing gaps can increase the fluid passing area, thereby improving the utilization rate of the filter medium, increasing the service life of the filter material, and reducing the fluid resistance. Further, in the utility model, a protruding portion protruding outward is provided at the bottom of the trough or the top of the peak of the corrugated filter sheet, and the provision of the protruding portion can further increase the fluid passing area and improve the use effect.

[0016] (3) In the utility model, at least one peak of the corrugated filter sheet is pressed and recessed to form two short peaks, and the two short peaks are pressed and inclined to the same side, so that the transition between the pressed portion and the non-pressed portion is smoother, which is beneficial to reducing the resistance of intake or exhaust.

[0017] In short, for the filter medium sheet or filter medium mass disclosed by the utility model, on the one hand, the filter materials are melt-welded together. Compared with bonding with glue, the amount of glue used between the two sheets is reduced, the manufacturing cost is lowered, the product weight is reduced, and resources are saved. On the other hand, due to the adoption of an intermittent melt-welding structure, the non-melt-welded parts can form fluid passing gaps, increasing the fluid passing area, thereby improving the utilization rate of the filter medium, increasing the service life of the filter material. Using it to manufacture an air filter, the structure is small and compact, the intake resistance is low, the dust capacity is higher, the maintenance period is longer, and the fluid resistance is also reduced. It can fully meet the emission upgrade requirements of National VI for roads and National IV for non-road applications, and has broad commercial prospects and market value. Brief Description of the Drawings

[0018] Figure 1 is a three-dimensional structural schematic diagram of Embodiment 1 of a filter medium sheet of the utility model;

[0019] Figure 2 is Figure 1 a side view of

[0020] Figure 3 is Figure 2The enlarged cross-sectional view at A-A in [the figure];

[0021] Figure 4A is Figure 2 The enlarged cross-sectional view at B-B in [the figure];

[0022] Figure 4B is Figure 2 The enlarged cross-sectional view at C-C in [the figure];

[0023] Figure 5A It is the cross-sectional view of the second embodiment of a filter medium sheet of the present utility model at the flow-through gap;

[0024] Figure 5B It is the cross-sectional view of the second embodiment of a filter medium sheet of the present utility model at the protruding part;

[0025] Figure 6 It is the three-dimensional structure diagram of the third embodiment of a filter medium sheet of the present utility model;

[0026] Figure 7 is Figure 6 The side view of [it];

[0027] Figure 8 is Figure 7 The enlarged cross-sectional view at D-D in [the figure];

[0028] Figure 9 is Figure 7 The enlarged cross-sectional view at F-F in [the figure];

[0029] Figure 10 It is the side view of the fourth embodiment of a filter medium mass of the present utility model looking from the first end to the second end;

[0030] Figure 11 It is the structure diagram of the fifth embodiment of a filter medium mass of the present utility model;

[0031] Figure 12 is Figure 11 The enlarged structure diagram at I in [the figure];

[0032] Figure 13 It is the structural schematic diagram of a filter medium mass forming device;

[0033] Figure 13A is Figure 13 The three-dimensional view of part of the equipment;

[0034] Figure 13B is Figure 13 The partial cross-sectional view of a pair of pressure wave wheels at the meshing part in [the figure];

[0035] Figure 14 is Figure 13 The schematic diagram of the corresponding structure of the second pressure wave wheel and the main ultrasonic welding head in [the figure];

[0036] Figure 15 is Figure 14 a side view of;

[0037] Figure 16 is Figure 13 a schematic diagram of the corresponding structures of the medium-pressure cam, forming roller and side ultrasonic welding head;

[0038] Figure 17 is Figure 16 a left view of;

[0039] Figure 18 is Figure 1 a schematic cross-sectional view of the initial waveform after the formation of the corrugated filter sheet shown;

[0040] Figure 19 is Figure 18 a schematic cross-sectional view of the formed waveform after the indentation step of the initial waveform shown;

[0041] Figure 20 is Figure 19 a schematic cross-sectional view of the formed waveform after the pressing-down step of the waveform shown;

[0042] In the figure, 10, flat filter sheet; 20, corrugated filter sheet; 20A, corrugated filter sheet stock; 21, wave crest; 22, wave trough; 23, valley protrusion; 24, crimped closed end; 25, fusion welding section; 26, flow-through gap; 27, peak protrusion; 28, flow-through gap; 30, sealant plugging section; 31, inflow channel; 32, outflow channel; 41, first corrugating wheel; 411, first convex block; 412, first groove; 413, annular groove; 42, second corrugating wheel; 421, second convex block; 422, second groove; 51, main ultrasonic welding head; 52, side ultrasonic welding head; 61, indentation wheel; 611, indentation wheel teeth; 62, forming roller; 70, peeling module; 71, peeling teeth; 72, filter material guide rail; 80, air-cooling module; 90, trimming module; 100A, filter medium mass; 100B, filter medium mass. Detailed implementation manners

[0043] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0044] The filter medium sheet is the basis of the filter medium mass, the filter medium mass is the basis of the filter element, and the filter element is the basis of the filter. Below, the structure, manufacturing process and working principle of the present utility model will be explained from several aspects such as the filter medium sheet, the filter medium mass and the filter medium mass forming equipment / forming method.

[0045] Regarding the filter medium sheet

[0046] Embodiment 1

[0047] As shown Figure 1 in the figure, a filter medium sheet includes a corrugated filter sheet 20 and a flat filter sheet 10. The corrugated filter sheet 20 has a plurality of alternately arranged crests 21 and troughs 22, and the crests 21 and troughs 22 extend from the first end to the second end of the corrugated filter sheet 20.

[0048] As shown Figure 2 , Figure 4A and Figure 4B in the figure, a valley convex portion 23 protruding outward is provided at the bottom of the trough 22. The valley convex portion 23 extends along the extending direction of the trough 22 and is intermittently arranged. The valley convex portion 23 is melt-welded to the flat filter sheet 10, and a flow-through gap 26 is formed between two adjacent valley convex portions 23 (see Figure 1 and Figure 4A ).

[0049] As shown Figure 2 and Figure 3 in the figure, the corrugated filter sheet 20 and the flat filter sheet 10 are pressed together near the first end to form a pressed portion, and the pressed portion is melt-welded into a pressed closed end 24 through which fluid cannot pass.

[0050] Compared with the prior art, on the one hand, due to the adoption of the melt-welding process, the amount of glue used between the two sheets is reduced, the manufacturing cost is lowered, the product weight is reduced, and resources are saved. On the other hand, since the valley convex portions 23 are intermittently arranged, a flow-through gap 26 is formed between two adjacent valley convex portions 23. This structure reduces the contact area between the two filter materials. When in use, these non-contact flow-through gaps 26 can increase the flow-through area of the fluid (such as air), thereby improving the utilization rate of the filter medium, increasing the service life of the filter material, and reducing the fluid resistance. The present invention is not limited to the structure of using convex portions to form the flow-through gap, and other structures can also be adopted, which will be described in detail in Embodiment 3 below.

[0051] As a preferred method, see Figure 3 , Figure 16 and Figure 19 and Figure 20 , at least one crest of the corrugated filter sheet 20 is pressed concave to form two short crests, and the two short crests are pressed and tilted to the same side. The purpose of doing this is to make the transition between the pressed part and the non-pressed part smoother, which is beneficial to reducing the resistance of air intake or air outlet.

[0052] Embodiment 2

[0053] As shown Figure 5A and Figure 5BAs shown in the figure, it can be seen that the corrugated filter sheet not only has a valley protrusion 23 protruding outward at the bottom of the wave valley 22, but also has a peak protrusion 27 protruding outward at the peak of the wave peak 21. The peak protrusion 27 extends along the extending direction of the wave peak 21 and is intermittently arranged, forming a fluid passage gap 28 between two adjacent peak protrusions. Although when stacking or winding to form a filter medium mass, the peak protrusion 27 is not fusion welded to another flat filter sheet, however, due to the existence of the peak protrusion 27 and the fluid passage gap 28, the fluid passage area is also increased, further improving the utilization rate of the filter medium, increasing the service life of the filter material, and reducing the fluid resistance.

[0054] Of course, if only the peak protrusion 27 is provided without the valley protrusion 23, a certain effect of increasing the fluid passage area can also be achieved.

[0055] Embodiment 3

[0056] As Figures 6 - 9 shown, another structure of another filter medium sheet is shown, that is, it does not have a peak protrusion 27 at the peak of the wave peak 21, nor does it have a valley protrusion 23 at the bottom of the wave valley 22. Instead, only along the extending direction of the wave valley 22, the corrugated filter sheet 20 is intermittently fusion welded to the flat filter sheet 10. During use, at the non-fusion welded part, due to the pressure of the fluid, the joint between the two is separated from contact to form a fluid passage gap. Figure 8 Schematic of the cross-sectional view at the non-fusion welded part Figure 9 Schematic of the cross-sectional view at the fusion welded section 25.

[0057] In the present utility model, for the filter medium sheet, the peak protrusion, the valley protrusion or the fusion welded part can be a dot structure or a segment structure. The function of the fusion welding is to fix the corrugated filter sheet and the flat filter sheet together, facilitating the stacking or winding of the filter medium mass, and at the same time, it can also fix the waveform of the corrugated filter sheet.

[0058] In the present utility model, the fusion welding method is not limited to hot plate welding, hot melt welding, ultrasonic welding, roll welding and other forms. In the following part of the present utility model, how to use ultrasonic welding technology to manufacture the filter medium sheet will be mainly introduced.

[0059] In the present utility model, the waveform cross-sectional shape of the corrugated filter sheet can be regular or irregular. At the pressing part, the wave peak of the corrugated filter sheet can be pressed to one side or both sides.

[0060] Regarding the filter medium mass

[0061] Embodiment 4

[0062] AsFigure 10 As shown, the filter medium mass 100A is formed by laminating a plurality of filter medium sheets. The filter medium sheets can be any one of the foregoing Embodiment 1, Embodiment 2, or Embodiment 3, and their specific structures will not be elaborated here.

[0063] As a common part, the filter medium sheets therein at least include a corrugated filter sheet 20 and a flat filter sheet 10. The corrugated filter sheet 20 has a plurality of alternately arranged peaks and valleys, and the peaks and valleys extend from the first end to the second end of the corrugated filter sheet 20; the valleys of the corrugated filter sheet 20 are melt-welded to the flat filter sheet 10, which can be melt-welded integrally or intermittently. When not melt-welded, at the joint of the two under the action of fluid pressure, the joint disengages to form a flow-through gap; it can also be melt-welded to the flat filter sheet 10 through the valley protrusions 23. The valley protrusions 23 extend along the extension direction of the valleys 22 and are intermittently arranged (see Figure 4A and 4B of Embodiment 1). The arrangement of the valley protrusions 23 can further increase the flow-through area and improve the use effect. The corrugated filter sheet 20 and the flat filter sheet 10 are pressed together near the first end to form a pressed portion, and the pressed portion is melt-welded into a pressed closed end through which fluid cannot pass. At the second end of the corrugated filter sheet 20, a sealant plugging section 30 that prevents fluid from passing through is provided with another flat filter sheet 10. Figure 1 Or Figure 6 shows the sealant plugging section 30. To illustrate the air flow path, arrows are also marked on Figure 1 or Figure 6 . Although the sealant plugging section 30 is not a part of the filter medium sheet, setting it on Figure 1 or Figure 6 makes it easier to understand the filtering principle of the filter medium mass 100A. As shown in Figure 10 , the filter medium mass 100A forms an alternately arranged inflow channel 31 and outflow channel 32 through the pressed closed end 24 and the sealant plugging section 30.

[0064] If the filter medium mass 100A uses the filter medium sheet of Embodiment 2, since there are outwardly protruding peak protrusions 27 at the peaks of the peaks 21, when forming the filter medium mass 100A by lamination, although the peak protrusions 27 only fit but are not melt-welded to another flat filter sheet, however, due to the existence of the peak protrusions 27 and the flow-through gap 28, the flow-through area of the fluid is also increased, further improving the utilization rate of the filter medium, increasing the service life of the filter material, and reducing the fluid resistance.

[0065] Embodiment 5

[0066] As Figure 11 and Figure 12 collectively shown, the filter medium mass 100B is formed by winding a filter medium sheet, and has a stadium track-shaped cross section. The filter medium sheet can be any one of the aforementioned Embodiment 1, Embodiment 2, or Embodiment 3, and its specific structure will not be elaborated herein. Figure 12 The enlarged view shows the first end, i.e., the crimping and closing end 24 (see Figure 1 or Figure 6 ), the inflow channel 31 is represented by the area without color, and the outflow channel 32 is represented by the black area.

[0067] Of course, the shapes of the filter medium masses are diverse. For example, it can also be circular.

[0068] Regarding the filter medium mass forming equipment and forming method

[0069] Taking the filter medium mass 100B shown in Embodiment 5 as an example, the forming method of the filter medium mass and the equipment used will be described in detail. The main contribution of the present invention to the prior art is mainly reflected in the forming method and forming equipment of the filter medium sheet. As for how to wind the filter medium sheet into the filter medium mass 100B and how to apply glue to form a sealing glue plugging section, etc., are well known to those of ordinary skill in the art and will not be elaborated herein. The following will only focus on the forming method and forming equipment of the filter medium sheet.

[0070] Figure 13 A filter medium mass forming equipment is shown, mainly showing the structure and principle of the filter medium sheet forming unit. Below, the concept of the present invention will be described from both the perspectives of the equipment and the method.

[0071] As Figure 13 shown, the filter medium sheet forming unit includes a wave forming module. The first wave pressing wheel 41 and the second wave pressing wheel 42 are important components of the wave forming module. The first wave pressing wheel 41 is a wave pressing wheel that can heat the wave-shaped filter sheet material 20A to be formed, and the second wave pressing wheel 42 is a wave pressing wheel that can heat the wave-shaped filter sheet material 20A to be formed and can adsorb the formed wave-shaped filter sheet 20 on its circumferential surface. The first wave pressing wheel 41 and the second wave pressing wheel 42 are used to perform the wave forming step of pressing a wave-shaped filter sheet material 20A into a wave-shaped filter sheet 20. After forming, the wave-shaped filter sheet 20 has a plurality of alternately arranged wave peaks and wave valleys, and the wave peaks and the wave valleys extend from the first end to the second end of the wave-shaped filter sheet. For the formed waveform cross section, see Figure 18 .

[0072] As Figure 13BAs shown, second bumps 421 are arranged at intervals on the tops of the formed teeth of the second wave pressing wheel 42, and first grooves 412 are arranged at intervals in the tooth grooves of the formed teeth of the first wave pressing wheel 41. When the second bumps 421 and the first grooves 412 are pressed together, valley protruding portions 23 are formed at the bottoms of the wave valleys of the corrugated filter sheet 20 (see Figure 5B ). In order to form peak protruding portions 27, as shown in Figure 13B and Figure 15 , first bumps 411 are arranged at intervals on the tops of the formed teeth of the first wave pressing wheel 41, and second grooves 422 are arranged at intervals in the tooth grooves of the formed teeth of the second wave pressing wheel 42. When the first bumps 411 and the second grooves 422 are pressed together, peak protruding portions 27 of the wave peaks of the corrugated filter sheet 20 are formed (see Figure 5B ). The first bumps 411 and the second bumps 421 can be integrally formed with the corresponding formed teeth, or can be fixed to the corresponding formed teeth by an inlay mode.

[0073] Continue to disclose the present invention.

[0074] As shown in Figure 13 , the forming device disclosed by the present invention is provided with an ultrasonic welding module. The structure and principle of the ultrasonic welding module are well known in the industry, and mainly include an ultrasonic generator, a transducer, a horn, a welding head, etc. Ultrasonic welding is to convert the current of 50 / 60Hz into high-frequency electric energy through an ultrasonic generator. The high-frequency electric energy is converted into mechanical motion of the same frequency again through the transducer, and then the mechanical motion is transmitted to the welding head through the horn device. The welding head transmits the received vibration energy to the joint of the workpiece to be welded. In this area, the vibration energy is converted into heat energy by friction to melt the materials to be welded. The ultrasonic welding module of the present invention includes a main ultrasonic welding head 51 and a side ultrasonic welding head 52. The main ultrasonic welding head 51 extends along the extending direction of the wave peaks or wave valleys of the corrugated filter sheet 20, and the side ultrasonic welding head 52 extends along the direction perpendicular to the wave peaks or the wave valleys.

[0075] As shown in Figure 14 , the main ultrasonic welding head 51 is located at a specified distance below the second wave pressing wheel 42. This distance is such that when a formed tooth of the second wave pressing wheel 42 approaches the main ultrasonic welding head 51, the wave valley of the corrugated filter sheet 20 located on the formed tooth is melt-welded to the corresponding part of the flat filter sheet 10. Of course, if valley protruding portions 23 are provided at the bottoms of the wave valleys of the corrugated filter sheet 20, when a formed tooth of the second wave pressing wheel 42 approaches the main ultrasonic welding head 51, the valley protruding portions 23 of the corrugated filter sheet located on the formed tooth are melt-welded to the corresponding parts of the flat filter sheet. Throughout the length, the main ultrasonic welding head 51 can be divided into multiple ones. In the present invention, it is divided into three, see Figure 15 .

[0076] In summary, since the main ultrasonic welding head 51 is provided below the second pressing roller 42, the trough of the corrugated filter sheet 20 can be bonded and melt-welded to a flat filter sheet 10 through the ultrasonic system. It can be continuous melt-welding, intermittent, or the valley protrusions of the corrugated filter sheet trough can also be melt-welded to the flat filter sheet. The essence of this step is sheet fixing, so this step can also be called the sheet fixing step.

[0077] There is a phenomenon that when the height of the second protrusion 421 (see Figure 13B ) is lower than a specified value (of course, at this time, the corresponding first groove 412 should also be shallower), although it can cause deformation at the bottom of the trough of the corrugated filter sheet 20 during the corrugation forming step, after the sheet fixing step, the valley protrusions of the corrugated filter sheet 20 are flattened again, and only intermittent melt-welded segments 25 are formed at the valley protrusions. The filter medium sheet of Embodiment 3 is manufactured in this way, as shown in Figures 6 - 9 . Moreover, with the different materials and thicknesses of the corrugated filter sheet 20, the height value of the second protrusion 421 and the depth value of the first groove 412 that cause the above changes are also different.

[0078] Continue to disclose the present invention.

[0079] The closed-end closing step is a key point in the forming of the filter medium sheet. The closed-end closing step includes a pressing step of pressing and combining the corrugated filter sheet 20 and the flat filter sheet 10 near the first end to form a pressed portion, and a melt-welding step of melt-welding the pressed portion through the ultrasonic welding module to form a pressed closed end 24 that cannot pass fluid. Among them, the pressing portion step includes a pressing concave step and a pressing down step. The pressing concave step includes a step of pressing at least one wave peak of the corrugated filter sheet to form two short wave peaks. The pressing down step includes a step of pressing down the two short wave peaks and making them fall to the same side onto the flat filter sheet to form a pressed portion.

[0080] As shown in Figure 13 , Figure 16 and Figure 17 , to implement the above steps, a pressing concave roller 61 and a forming pressing roller 62 are sequentially arranged above the side ultrasonic welding head 52 in the forming device of the present invention. The pressing concave step of the corrugated filter sheet is jointly realized by the pressing concave roller 61 and the side ultrasonic welding head 52, and the pressing down step is jointly realized by the side ultrasonic welding head 52 and the forming pressing roller 62. The pressing concave roller 61 and the forming pressing roller 62 form a closed-end closing module. If the cross-sectional shape of the waveform after pressing down is not considered, only the forming pressing roller 62 can also be used.

[0081] The indentation wheel 61 is provided with indentation wheel teeth 611. The side ultrasonic welding head 52 supports the corrugated filter sheet 20 and the flat filter sheet 10. The indentation wheel teeth 611 press one wave peak top of the formed corrugated filter sheet 20 into two short wave peaks. For the waveform cross-section after indentation, see Figure 19 .

[0082] The forming pressure roller 62 further presses down the corrugated filter sheet 20 after indentation and makes it fall to the same side onto the flat filter sheet 10 to form the pressing portion. For the waveform cross-section after falling, see Figure 20 , and the side ultrasonic welding head 52 and the forming pressure roller 62 jointly melt-weld the pressing portion into a pressed closed end 24. For the cross-sectional shape of the pressed closed end 24, see Figure 3 .

[0083] Continue to disclose the present invention.

[0084] The forming method of the present invention further includes a peeling step, which is a step of peeling the formed corrugated filter sheet 20 adhered to the first wave-forming wheel 41 from the first wave-forming wheel 41 through the peeling module 70.

[0085] As Figure 13 and Figure 13A shown, the peeling module 70 includes peeling teeth 71 and a filter material guide rail 72. The peeling teeth 71 are fixed to the filter material guide rail 72 and extend into the annular groove 413 of the first wave-forming wheel 41. The filter material guide rail 72 is arc-shaped and is arranged on one side of the second wave-forming wheel 42. Generally, the formed corrugated filter sheet can be adsorbed on the second wave-forming wheel 42 through negative pressure. The setting of the peeling module 70 can further improve the reliability of peeling. The arc-shaped filter material guide rail 72 can make the formed hot corrugated filter sheet lean against the second wave-forming wheel 42 to prevent it from falling.

[0086] Continue to disclose the present invention.

[0087] As Figure 13 shown, the forming method of the present invention is provided with a cooling step after the wave forming step. The cooling step is a step of cooling and shaping the hot-formed corrugated filter sheet. The cooling step is preferably an air cooling step. In the present invention, the air cooling step is realized through the air cooling module 80. For example, a cooling frame box, which is connected to an external industrial air conditioner, and the cooling frame box has an air outlet for blowing air and cooling at the adjacent position of the second wave-forming wheel 42 and the closed end closing module (in this embodiment, it refers to the indentation wheel 61).

[0088] As Figure 13As shown in the figure, the forming equipment of the present invention further includes a trimming module 90. The trimming module 90 is located downstream of the forming roller 62. Since the present invention adopts ultrasonic welding process, compared with the adhesive process, there is no drawback of glue flowing, so the trimming width is greatly reduced.

[0089] The present utility model is not limited to the above embodiments. All improvements made based on the concept, principle, structure and method of the present utility model will fall within the protection scope of the present utility model.

Claims

1. A filter medium sheet, comprising: A wavy filter sheet and a flat filter sheet, wherein the wavy filter sheet has a plurality of alternately arranged crests and troughs, and the crests and troughs extend from a first end to a second end of the wavy filter sheet; characterized in that: The trough of the wavy filter sheet is melt-welded with the planar filter sheet, the wavy filter sheet and the planar filter sheet are pressed together near the first end to form a pressed portion, and the pressed portion is melt-welded to form a pressed closed end through which fluid cannot pass.

2. The filter medium sheet according to claim 1, characterized in that: Along the extension direction of the trough, the wavy filter sheet and the flat filter sheet are intermittently melt-welded together, and the non-melt-welded parts are separated from contact during use to form a flow gap.

3. The filter medium sheet according to claim 1, characterized in that: The bottom of the trough is provided with a trough protrusion protruding outward, the trough protrusion extends along the extension direction of the trough and is intermittently arranged, the trough protrusion is melt-welded with the planar filter sheet, and a flow gap is formed between two adjacent trough protrusions.

4. The filter medium sheet according to claim 1, 2 or 3, characterized in that: The peak top of the wave crest is provided with a peak protrusion protruding outward, and the peak protrusion extends along the extension direction of the wave crest and is intermittently arranged, forming a flow gap between two adjacent peak protrusions.

5. The filter medium sheet according to claim 1, characterized in that: At the pressing portion, at least one wave crest of the corrugated filter sheet is depressed to form two short wave crests, and the two short wave crests are pressed downward to tilt toward the same side.

6. A filter medium group, formed by winding or stacking filter medium sheets, wherein the filter medium sheets include corrugated filter sheets and flat filter sheets, wherein the corrugated filter sheets have a plurality of alternately arranged crests and troughs, wherein the crests and troughs extend from a first end to a second end of the corrugated filter sheets; characterized in that: The trough of the wavy filter sheet is melt-welded with the flat filter sheet, the wavy filter sheet and the flat filter sheet are pressed together near the first end to form a pressed portion, and the pressed portion is melt-welded to form a pressed closed end through which fluid cannot pass, the wave crest of the wavy filter sheet and another flat filter sheet are provided with a sealant sealing section through which fluid cannot pass near the second end, and the filter medium mass forms an alternating inlet channel and an outlet channel through the pressed closed end and the sealant sealing section.

7. The filter medium mass according to claim 6, characterized in that Along the extension direction of the trough, the wavy filter sheet and the flat filter sheet are intermittently melt-welded together, and the non-melt-welded parts are separated from contact during use to form a flow gap.

8. The filter medium mass according to claim 6, wherein: The bottom of the trough is provided with a trough protrusion protruding outward, the trough protrusion extends along the extension direction of the trough and is intermittently arranged, the trough protrusion is melt-welded with the planar filter sheet, and a flow gap is formed between two adjacent trough protrusions.

9. The filter medium mass according to claim 6, 7 or 8, characterized in that: The peak top of the wave crest is provided with a peak protrusion protruding outward, and the peak protrusion extends along the extension direction of the wave crest and is intermittently arranged, forming a flow gap between two adjacent peak protrusions.

10. The filter medium mass according to claim 6, wherein: At the pressing portion, at least one wave crest of the corrugated filter sheet is depressed to form two short wave crests, and the two short wave crests are pressed downward to tilt toward the same side.

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