Pleated filter media with M-shaped grooves and production line thereof

Abstract

The utility model discloses a wrinkled filter medium with M-shaped grooves, which comprises groove-shaped filter paper and plane filter paper adhered to the lower surface of the groove-shaped filter paper, the section of the groove-shaped filter paper is wave-shaped, and a plurality of air inlet channels are enclosed between the plane filter paper and the lower surface of the groove-shaped filter paper; when the corrugated filter medium forms the filter element in a winding or stacking mode, air outlet channels are defined between the upper surface of the groove-shaped filter paper and the plane filter paper above the groove-shaped filter paper, the air outlet channels and the air inlet channels are alternately arranged, the extending direction of the air outlet channels and the air inlet channels is the front-back direction, and the air outlet end is the front direction. The shapes and the sizes of the sections of the air outlet channel and the air inlet channel are kept unchanged in the front-back direction; the sectional area of the air inlet channel is larger than that of the air outlet channel. The air inlet channel is in an M shape or a double-M shape. The utility model further discloses a corresponding production line. Under the condition that the integral volume of the air inlet channel and the air outlet channel is not changed, the volume of the air inlet channel is increased, so that the dust holding capacity of the air inlet channel is improved, the filter resistance is increased less when the same amount of dust is held, and the service life of the filter element adopting the air inlet channel is prolonged.

Description

Technical Field

[0001] The utility model relates to an air filtering technology, in particular to a filtering medium structure of a straight-through air filter element. Background Art

[0002] Corrugated filter media is a type of filter media often used in straight-through air filter elements. Its basic structure is a double-layer structure, including a groove filter paper and a flat filter paper bonded to the groove filter paper. The corrugated filter media is wound, stacked or folded to form a straight-through air filter element.

[0003] The corrugated filter medium is described as follows, with the slotted filter paper on top (in fact, there is no up-and-down direction, only the relative position relationship between the slotted filter paper and the flat filter paper exists. The utility model is described in the up-and-down direction for the convenience of description):

[0004] The corrugated filter medium includes a groove filter paper and a flat filter paper bonded to the lower surface of the groove filter paper. The cross-section of the groove filter paper is wavy, and a number of air inlet channels are formed between the flat filter paper and the lower surface of the groove filter paper. When the corrugated filter medium is formed into a filter element in a winding or stacking manner, an air outlet channel is formed between the upper surface of the groove filter paper and the flat filter paper above it, and the air outlet channels and the air inlet channels are alternately arranged.

[0005] The extension direction of the air outlet channel and the air inlet channel is the front-to-back direction. The rear end of the air outlet channel, i.e., the air inlet end, is open, and the front end of the air outlet channel, i.e., the air outlet end, is closed. On the contrary, the rear end of the air inlet channel, i.e., the air inlet end, is closed, and the front end of the air inlet channel, i.e., the air outlet end, is open. During operation, air enters the air inlet channel from the air inlet end. Since the air outlet end of the air inlet channel is closed, the air flow is forced to pass through the groove filter paper into the air outlet channel, and then flows out from the air outlet end of the air outlet channel. When the air flow passes through the groove filter paper, the groove filter paper blocks the particles in the air, and a considerable part of the particles (impurities) remain in the air inlet channel.

[0006] According to the characteristics of the air inlet channel and the air outlet channel, the existing corrugated filter medium has two structures (regardless of the structure, the cross-sectional areas of the air inlet channel and the air outlet channel of the existing corrugated filter medium are equal or reversely equal, and the volumes of the air inlet channel and the air outlet channel are the same):

[0007] 1. Complete and direct symmetrical structure. Figure 1 shown.

[0008] The characteristics of this structure are: on any section perpendicular to the corrugated filter medium (if the corrugated filter medium is placed horizontally, it is any vertical section), the cross-sectional area of ​​the air inlet channel and the air outlet channel are equal. The characteristics of this structure are: low dust holding capacity and short filter element life. The principle is that impurities will accumulate in the air inlet channel, and the cross-sectional area of ​​the air inlet channel will decrease day by day during long-term use, resulting in a shorter filter element life.

[0009] 2. Wedge-shaped reverse symmetrical structure. Figure 2 shown.

[0010] Taking the midpoint of the corrugated filter medium in the front-to-back direction as the symmetric point, the cross-sections of the air inlet channel and the air outlet channel perpendicular to the direction of the corrugated filter medium are called the flow cross-sections of the air inlet channel and the air outlet channel.

[0011] The characteristics of this structure are: in the front-to-back direction, the areas of the intake channel section and the outlet channel section are the same, which are symmetrical about the symmetry point (the distances from the symmetry point on both sides of the symmetry point are the same). For the intake channel, the area of ​​the intake end section is the largest, and it gradually decreases from the back to the front. For the intake channel, the area of ​​the intake end section is the smallest, and it gradually increases from the back to the front.

[0012] Compared with the completely and directly symmetrical structure, the wedge-shaped reverse symmetrical structure increases the dust holding capacity and reduces the airflow resistance, which is a significant improvement over the completely and directly symmetrical structure. The principle that the wedge-shaped reverse symmetrical structure can increase the dust holding capacity is: 1. Because the air inlet channel closer to the air inlet end is more likely to accumulate dust, this part of the air inlet channel can be expanded; 2. Due to the variable cross-section design of the air inlet channel, the inlet is large and gradually decreases toward the outlet, making it easier for air to flow into the air inlet cavity; in the second half of the air inflow (close to the air inlet end), the cross-sectional area of ​​the air inlet channel is larger than the air outlet channel, and the air inlet force squeezes out the air force; in the first half of the air inlet channel (close to the air outlet end), the cross-sectional area of ​​the air inlet cavity is smaller than the air outlet cavity, and the air flows out quickly; these ultimately cause the resistance to decrease, and when the resistance decreases, the dust holding capacity will increase accordingly.

[0013] However, the corrugated filter medium with a wedge-shaped reverse symmetrical structure also has an obvious problem. That is, during processing, the air outlet channel surrounded by the upper surface of the grooved filter paper and the air inlet channel surrounded by the lower surface need to be processed into a wedge shape with front and rear reverse symmetry. The design and manufacturing of the required forming rollers are difficult, and the coordination of the upper and lower forming rollers also needs to be more precise. The processing is difficult, the process is complicated, and the processing cost is high.

[0014] The design idea of ​​the utility model is to increase the dust holding capacity of the air inlet channel and improve the service life of the filter element by increasing the cross-sectional area (volume) of the air inlet channel, and at the same time, the air inlet channel and the air outlet channel are both set to a shape with a constant vertical cross-sectional area, so as to facilitate processing and reduce processing costs. The utility model makes the air inlet channel larger than the air outlet channel as a whole, and its principle is:

[0015] The air inlet channel is a dirty air channel, and the air outlet channel is a clean air channel. The air outlet channel will not be blocked. The technical solution of the prior art that the air inlet channel and the air outlet channel have the same volume (equal cross-sectional area or reverse symmetrical equal) is adopted. As time goes by, when the filter resistance of the filter element exceeds the specified value and the filter element is scrapped, the air inlet channel accumulates more particulate matter (impurities) and becomes narrower than the air outlet channel. That is, using the prior art, the air inlet channel and the air outlet channel have the same volume under factory conditions, but when the filter element is scrapped, the remaining empty volume of the air inlet channel is significantly smaller than the remaining empty volume of the air outlet channel (the air outlet channel does not need to be that large). Therefore, the present invention enlarges the air inlet channel and reduces the air outlet channel during the manufacturing stage, which not only increases the dust holding capacity of the air inlet channel, but also does not shorten the service life of the filter element prepared using corrugated filter media due to the reduction of the air outlet channel. Utility Model Content

[0016] The purpose of the utility model is to provide a pleated filter medium with M-shaped grooves, in which the air inlet channel and the air outlet channel have constant cross-sectional areas in each vertical section in the front-to-back direction, and the air inlet channel is larger than the air outlet channel, thereby improving the dust holding capacity of the air inlet channel.

[0017] To achieve the above-mentioned purpose, the utility model of the pleated filter medium with M-shaped grooves comprises a groove filter paper and a flat filter paper bonded to the lower surface of the groove filter paper, the cross section of the groove filter paper is wavy, and a plurality of air inlet channels are formed between the flat filter paper and the lower surface of the groove filter paper; when the corrugated filter medium is wound or stacked to form a filter element, an air outlet channel is formed between the upper surface of the groove filter paper and the flat filter paper above it, and the air outlet channel and the air inlet channel are alternately arranged.

[0018] With the extension direction of the air outlet channel and the air inlet channel as the front-to-back direction and the air outlet end as the front direction, the shapes and sizes of the cross-sections of the air outlet channel and the air inlet channel remain unchanged in the front-to-back direction; the cross-sectional area of ​​the air inlet channel is larger than the cross-sectional area of ​​the air outlet channel.

[0019] The air intake passage is in an M shape or a double M shape.

[0020] The utility model also discloses a production line of the pleated filter medium with M-shaped grooves, comprising an upper filter paper roller wound with an upper filter paper and a lower filter paper roller wound with a lower filter paper, the upper filter paper moving forward is the forward direction, an upper tension roller group, a turning roller group and an impression roller group are arranged in sequence in front of the upper filter paper roller, the impression roller group comprises an upper impression roller and a lower impression roller, the upper impression roller and the lower impression roller are meshed with each other and are used to impression the upper filter paper passing therethrough into a groove-shaped filter paper; the upper filter paper passes through the meshing portion between the upper impression roller and the lower impression roller after being wound around the upper tension roller group and the turning roller group in sequence;

[0021] A lower tension roller group, a lower guide roller and a lower paper feeding roller are arranged in sequence in front of the lower filter paper roller. The upper end of the lower paper feeding roller is rotatably pressed and matched with the lower end of the lower impression roller to form a composite part. The lower filter paper is wound around the lower tension roller group and the lower guide roller in sequence.

[0022] The front end of the upper filter paper bypasses the lower impression roller and enters the composite part, and the front end of the lower filter paper bypasses the lower guide roller and enters the composite part. At the composite part, the upper filter paper is located above the lower filter paper. After the upper filter paper and the lower filter paper are bonded and sealed by hot melt adhesive at the composite part, a pleated filter medium with an M-shaped groove is formed and sent forward.

[0023] The utility model has the following advantages:

[0024] When the service life of the existing straight-through air filter reaches the end of its service life, the remaining volume of the outlet channel is significantly higher than the remaining volume of the inlet channel, and the outlet channel has a large redundancy in the filter resistance at the end of the service life of the filter element design. During the manufacturing stage, the volume of the inlet channel is increased under the condition that the overall volume of the inlet channel and the outlet channel remains unchanged; thereby increasing the dust holding capacity of the inlet channel, and the filter resistance increases less when the same amount of dust is held, thereby extending the service life of the filter element using the utility model.

[0025] The air inlet channel is M-shaped or double M-shaped, which expands the surface area of ​​the slot filter paper shared between the air inlet channel and the air outlet channel without changing the volume of the air inlet channel. This part of the slot filter paper has the function of passing the airflow and blocking the particles in the airflow. Due to the enlarged surface area, under the same dust holding capacity (under the condition of blocking the same amount of particles), this part of the slot filter paper is less likely to be blocked, further improving the service life of the filter element using the utility model.

[0026] The production line of the utility model has an extremely simple structure and can efficiently produce the pleated filter medium with M-shaped grooves of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a cross-sectional view of a corrugated filter medium with a completely and directly symmetrical structure in the prior art.

[0028] Figure 2 It is a cross-sectional view of a corrugated filter medium with a wedge-shaped reverse symmetrical structure in the prior art.

[0029] Figure 3 It is a structural schematic diagram of the utility model in which the air intake passage is M-shaped.

[0030] Figure 4 It is a structural schematic diagram of the utility model in which the air intake passage is in a double M shape.

[0031] In the front-to-back direction, the cross-sectional shapes of various parts of the utility model are the same, so the cross-sectional structure can clearly represent the structure of the utility model.

[0032] Figure 5 It is a structural schematic diagram of a production line of a pleated filter medium with M-shaped grooves of the utility model. DETAILED DESCRIPTION

[0033] like Figure 3 and Figure 4 As shown, the pleated filter medium with M-shaped grooves of the utility model comprises a groove filter paper 1 and a flat filter paper 2 bonded to the lower surface of the groove filter paper 1. The cross section of the groove filter paper 1 is wavy, and a plurality of air inlet channels 3 are formed between the flat filter paper 2 and the lower surface of the groove filter paper 1. Figures 1 to 4 When the corrugated filter medium is wound or stacked to form a filter element, an air outlet channel 4 is formed between the upper surface of the groove filter paper 1 and the flat filter paper 2 above it ( Figures 1 to 4 The black area in the figure shows that the air outlet channels 4 and the air inlet channels 3 are arranged alternately.

[0034] With the extension direction of the air outlet channel 4 and the air inlet channel 3 as the front-to-back direction and the air outlet end as the front direction, the cross-sections of the air outlet channel 4 and the air inlet channel 3 remain unchanged in shape and size in the front-to-back direction; (neither the air outlet channel 4 nor the air inlet channel 3 are variable cross-section channels, but channels with constant cross-sections, which is convenient for manufacturing) the cross-sectional area of ​​the air inlet channel 3 is larger than the cross-sectional area of ​​the air outlet channel 4.

[0035] When the service life of the existing straight-through air filter reaches the end, the remaining volume of the outlet channel 4 is significantly higher than the remaining volume of the inlet channel 3, and the outlet channel 4 has a large redundancy in the filter resistance at the end of the service life of the filter element. The utility model increases the volume of the inlet channel 3 during the manufacturing stage, thereby increasing the dust holding capacity of the inlet channel 3. When the same amount of dust is held, the filter resistance increases less, thereby extending the service life of the filter element using the utility model.

[0036] The air intake passage 3 is in an M shape or a double M shape.

[0037] The air inlet channel 3 is in an M-shape or double M-shape, which enlarges the surface area of ​​the slot filter paper 1 shared between the air inlet channel 3 and the air outlet channel 4 without changing the volume of the air inlet channel 3. This part of the slot filter paper 1 has the function of passing the airflow and blocking the particles in the airflow. Due to the enlarged surface area, under the same dust holding capacity (under the condition of blocking the same amount of particles), this part of the slot filter paper 1 is less likely to be blocked, further improving the service life of the filter element using the utility model.

[0038] like Figure 5As shown, the utility model also provides a production line for the pleated filter medium with M-shaped grooves, including an upper filter paper roller 6 with an upper filter paper 5 wound thereon and a lower filter paper roller 7 with a lower filter paper wound thereon, wherein the lower filter paper is the flat filter paper 2.

[0039] The filter paper 5 moves forward in the forward direction. The upper filter paper roller 6 is provided with an upper tension roller group 8, a turning roller group 9 and an impression roller group in sequence in front of the upper filter paper roller 6. The impression roller group includes an upper impression roller 10 and a lower impression roller 11. The surfaces of the upper impression roller 10 and the lower impression roller 11 have impression teeth and mesh with each other. The upper impression roller 10 and the lower impression roller 11 are used to emboss the upper filter paper 5 passing therethrough into a groove-shaped filter paper 1. The upper filter paper 5 passes through the upper tension roller group 8 and the turning roller group 9 in sequence and then passes through the meshing portion between the upper impression roller 10 and the lower impression roller 11.

[0040] A lower tension roller group 12, a lower guide roller 13 and a lower paper feeding roller 14 are arranged in sequence in front of the lower filter paper roller 7. The upper end of the lower paper feeding roller 14 is rotatably pressed and matched with the lower end of the lower impression roller 11 to form a composite part. The lower filter paper is wound around the lower tension roller group 12 and the lower guide roller 13 in sequence.

[0041] The front end of the upper filter paper 5 bypasses the lower impression roller 11 and enters the composite part, and the front end of the lower filter paper bypasses the lower guide roller 13 and enters the composite part. The upper filter paper 5 is located above the lower filter paper at the composite part. The upper filter paper 5 and the lower filter paper are sealed by hot melt adhesive at the composite part to form a pleated filter medium with an M-shaped groove and are sent forward.

[0042] The production line of the utility model has an extremely simple structure and can efficiently produce the pleated filter medium with M-shaped grooves of the utility model.

[0043] During production, the upper filter paper 5 is wound on the upper filter paper roller 6, and the lower filter paper is wound on the lower filter paper roller 7. The lower impression roller 11 is driven to rotate by an external power device, and the lower impression roller 11 drives the upper impression roller 10 and the lower paper feeding roller 14 to rotate synchronously, so that the upper filter paper 5 passes through the upper tension roller group 8, the turning roller group 9, the meshing part between the upper impression roller 10 and the lower impression roller 11, and the composite part in sequence, and the lower filter paper passes through the lower tension roller group 12, the lower guide roller 13 and the composite part in sequence. The upper impression roller 10 and the lower impression roller 11 have tooth shapes that match the design shape of the groove filter paper 1. At the meshing part between the upper impression roller 10 and the lower impression roller 11, the upper filter paper 5 is embossed and formed into the groove filter paper 1; at the composite part, hot melt adhesive is used to bond and seal the two ends of the composite filter medium to form a pleated filter medium with an M-shaped groove. The pleated filter medium with an M-shaped groove is sent forward from the composite part. Before the filter papers on the upper filter paper roller 6 and the lower filter paper roller 7 are used up, the production line of the utility model can continuously produce the pleated filter media with M-shaped grooves.

[0044] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A pleated filter medium with M-shaped grooves, comprising a groove filter paper and a flat filter paper bonded to the lower surface of the groove filter paper, wherein the cross section of the groove filter paper is wavy, and a plurality of air inlet channels are formed between the flat filter paper and the lower surface of the groove filter paper; when the corrugated filter medium is wound or stacked to form a filter element, an air outlet channel is formed between the upper surface of the groove filter paper and the flat filter paper above it, and the air outlet channels and the air inlet channels are alternately arranged, characterized in that: With the extension direction of the air outlet channel and the air inlet channel as the front-to-back direction and the air outlet end as the front direction, the shapes and sizes of the cross-sections of the air outlet channel and the air inlet channel remain unchanged in the front-to-back direction; the cross-sectional area of ​​the air inlet channel is larger than the cross-sectional area of ​​the air outlet channel.

2. The pleated filter medium with M-shaped grooves according to claim 1, characterized in that: The air intake passage is in an M shape or a double M shape.

3. A production line for producing the pleated filter medium with M-shaped grooves as claimed in claim 1 or 2, comprising an upper filter paper roll wound with an upper filter paper and a lower filter paper roll wound with a lower filter paper, characterized in that: The filter paper moves forward in the forward direction. The upper filter paper roller is provided with an upper tension roller group, a turning roller group and an impression roller group in sequence in front of the upper filter paper roller. The impression roller group includes an upper impression roller and a lower impression roller. The upper impression roller and the lower impression roller are meshed with each other and are used to imprint the upper filter paper passing therethrough into a groove-shaped filter paper. The upper filter paper passes through the upper tension roller group and the turning roller group in sequence and then passes through the meshing portion between the upper impression roller and the lower impression roller. A lower tension roller group, a lower guide roller and a lower paper feeding roller are arranged in sequence in front of the lower filter paper roller. The upper end of the lower paper feeding roller is rotatably pressed and matched with the lower end of the lower impression roller to form a composite part. The lower filter paper is wound around the lower tension roller group and the lower guide roller in sequence. The front end of the upper filter paper bypasses the lower impression roller and enters the composite part, and the front end of the lower filter paper bypasses the lower guide roller and enters the composite part. At the composite part, the upper filter paper is located above the lower filter paper. After the upper filter paper and the lower filter paper are bonded and sealed by hot melt adhesive at the composite part, a pleated filter medium with an M-shaped groove is formed and sent forward.

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