A filter

Abstract

The utility model discloses a filter, the filter includes annular filter main part (1), annular sealing portion (2), annular hard support part (3), the annular sealing portion (2) is fixed in the both ends of annular filter main part (1) and forms filter core (4), the annular hard support part (3) is located filter core (4) one end or both ends, the annular hard support part (3) is detachable part, the annular filter main part (1) and annular sealing portion (2) are deformable parts, the width of annular filter main part (1) is 20~40mm. The filter of the utility model has the characteristics that can compressible deformation and easy recovery.

Description

Technical Field

[0001] This utility model relates to a filter. Background Technology

[0002] In recent years, the types of filters have gradually increased. Generally, the sealing parts of filters in existing technology are made of plastic or paper. These materials are relatively rigid, and although they can fix the shape of the filter, they have the drawback of not being easy to fold, and they take up a lot of space during transportation. In addition, there are also filters on the market made of filter elements with soft frames. Although these filters can be folded, they are difficult to restore after folding.

[0003] For example, Chinese patent CN215138039U discloses a composite filter and air purification device. This composite filter includes a filter element body, a first end cap, and a second end cap, with the first and second end caps positioned opposite each other. The filter element body is a cylinder with openings at both ends, and is confined between the first and second end caps. Because the filter is restricted by the first and second end caps, the upper and lower end caps are not removable. Therefore, this composite filter is not easily folded or compressed, and its packaging requires a large amount of space during transportation.

[0004] For example, Chinese patent CN216457521U discloses a flexible frame filter element. This filter element includes a cylindrical filter element body, a flexible lower frame, and a flexible upper frame. A hollow structure is formed in the middle of the filter element body. The filter element body is formed by folding sheet-like filter material. The filter element body can be folded along the folding edge to reduce the hollow structure. Although this filter element can be folded and compressed, after being folded and packaged and stored in the warehouse for a long time, the shape of the filter element is difficult to restore, making it difficult to install during subsequent air purifier assembly. Utility Model Content

[0005] The purpose of this invention is to provide a filter that can be folded and compressed during transportation and restored during use.

[0006] The technical solution of this utility model is as follows: The filter of this utility model includes an annular filter body 1, an annular sealing part 2, and an annular rigid support part 3. The annular sealing part 2 is fixed at both ends of the annular filter body 1 to form a filter element 4. The annular rigid support part 3 is located at one or both ends of the filter element 4. The annular rigid support part 3 is a detachable part. The annular filter body 1 and the annular sealing part 2 are deformable parts. The width A of the annular filter body 1 is 20-40mm.

[0007] The beneficial effects of this utility model are: the filter of this utility model has the characteristics of being foldable and compressible during transportation and being able to be restored during use. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of the filter of this utility model, wherein: 1 is an annular filter body, 2 is an annular sealing part, 3 is an annular rigid support part, and 4 is a filter element.

[0009] Figure 2 This is a schematic diagram of the structure of the novel filter after folding and compression, wherein: 1 is the annular filter body and 2 is the annular sealing part.

[0010] Figure 3 This is a schematic diagram of the combination of the annular rigid support and the annular filter body of this utility model, wherein: 1 is the annular filter body, 2 is the annular sealing part, 3 is the annular rigid support part, and 4 is the filter element.

[0011] Figure 4 This is a schematic diagram of the annular support part of this utility model, wherein: 3-1 is the upper part, 3-2 is the lower part, 3-1-1 is the half-face angle between the outer rings of the upper and lower parts, and 3-2-1 is the outer ring surface of the lower part. Detailed Implementation

[0012] The filter of this utility model includes an annular filter body, an annular sealing part, and an annular rigid support part. The annular sealing part is fixed at both ends of the annular filter body to form a filter element. The annular rigid support part is located at one or both ends of the filter element. The annular rigid support part is a detachable component. The annular filter body and the annular sealing part are deformable components. The width of the annular filter body is 20-40mm.

[0013] In this utility model, the annular rigid support part is disassembled during transportation and then installed in the filter element during use.

[0014] The aforementioned filter body is a cylindrical three-dimensional structure with an annular cross-section. Specifically, it is formed by joining the ends of filter material that has been pleated into a continuously bent V-shaped structure. The annular sealing part is also a flexible and bendable material, which is fixedly bonded to both ends of the annular filter body with an adhesive to form the filter element. Both the annular filter body and the annular sealing part are deformable components. Therefore, it is deformable and can be unfolded to form a cylindrical, elliptical, or square shape, or compressed into a flat shape. During transportation, the filter element is compressed into a flat shape, and then the annular rigid support is placed horizontally in the hollow position of the compressed filter element. No separate packaging is required for transportation, which can effectively utilize packaging and transportation space and save transportation costs. During use, the filter element is unfolded into a cylindrical, elliptical, or square shape, and then the annular rigid support is installed at one or both ends of the filter element to form a filter.

[0015] The width A of the aforementioned annular filter body is 20–40 mm, and the width B of the sealing part is greater than the width A of the annular filter body, with the difference preferably being 2–10 mm, more preferably 2–6 mm. Here, width refers to radial thickness, i.e., the distance from the inner to the outer ring of the annular cross-section. The annular sealing part covers both ends of the annular filter body and folds along the circumference of the annular filter body towards its outer and inner ring surfaces. The folded edges are bonded to the outer and inner ring surfaces of the filter body using an adhesive. If the width B of the annular sealing part is less than the width A of the annular filter body, air will leak from the top of the filter element after the sealing part is fitted against the annular edge of the filter body, resulting in increased pressure loss and reduced filtration efficiency.

[0016] The above-mentioned adhesive is a hot melt pressure-sensitive adhesive, which is resistant to high and low temperatures and remains flexible after curing at room temperature. Considering the transportation and use environment, the adhesive does not flow or slip at a high temperature of around 70℃, and does not crack at a low temperature of around -25℃.

[0017] The aforementioned annular rigid support is located at one or both ends of the filter element, preferably at both ends, and is a detachable component. This detachable annular rigid support primarily serves to fix the shape of the filter element. Specifically, it is an integrally injection-molded rigid support, preferably made of ABS, PP, or PPS, more preferably ABS, and has an upper and a lower portion.

[0018] The aforementioned annular rigid support is a continuous annular structure, comprising an upper annular part and a lower annular part. The outer diameter of the upper annular part is larger than the outer diameter of the lower annular part. The ratio of the outer circumference of the lower annular rigid support to the inner circumference of the annular filter body is preferably 96-99%. The outer circumference of the lower annular rigid support serves to support the filter body. If the ratio is too small, the lower part of the support cannot contact the inner surface of the filter, thus failing to provide support. If the ratio is too large, the lower part of the support will excessively compress the inner ring of the annular filter body, causing deformation and damage at the inner ring, thereby reducing the filter's filtration performance.

[0019] The ratio of the outer circumference of the upper part of the aforementioned annular rigid support to the outer circumference of the annular filter body is preferably 95-100%, and the ratio to the inner circumference of the annular filter body is preferably 120-140%. Within the above range, the annular rigid support can support the filter body and will not fall out of the hollow part of the filter element.

[0020] The included angle between the upper and lower outer rings of the aforementioned annular rigid support is preferably 90 to 110°. If it is too small, the lower part of the support will collide with the inner ring of the filter body when the annular rigid support is installed, making assembly impossible; if it is too large, the contact area between the lower part of the annular rigid support and the inner ring of the filter body will be reduced, weakening the support effect on the filter and hindering the shape stability of the filter.

[0021] The width of the lower part of the aforementioned annular rigid support is preferably 2 to 6 mm. Here, the width refers to the radial thickness, that is, the distance from the inner ring to the outer ring of the annular rigid support. If the width is too small, the strength of the support will be weakened, and it will be prone to breakage during use, thus affecting assembly; if the width is too large, it will obstruct the airflow too much.

[0022] The outermost layer of this filter is a coarse filter layer, which is located on the outer surface of the filter element. This coarse filter layer can intercept larger suspended particles such as dust and lint in the environment. After the filter has been used for a period of time, if too much dust accumulates on the coarse filter layer, first remove the annular rigid support from the filter, then press the filter element to remove the coarse filter layer from the filter element for cleaning, and then continue using the filter.

[0023] The two ends of the aforementioned coarse filter layer are ultrasonically welded. The width of the welded area is preferably 2.0–5.0 mm. If it is too narrow, the coarse filter layer may break at the joint during compression deformation; if it is too wide, the filter area will be reduced, leading to increased air resistance and reduced filtration efficiency. Considering the air resistance and filtration efficiency of the filter layer, the width of the welded area is more preferably 2.0–3.0 mm.

[0024] The preferred material for the coarse filter is PET or PA. Air purifiers are generally used indoors. Considering the extreme cold and extreme heat modes, the indoor ambient temperature is assumed to be -20℃ to 60℃. The coarse filter and the welded parts can withstand a tensile force of more than 100N without the coarse filter breaking or the welded parts cracking.

[0025] The filter of this invention can be of various shapes, such as cylindrical, elliptical, and square. Considering compatibility with air purifiers currently on the market, the filter of this invention is preferably cylindrical or square.

[0026] The present invention will be further illustrated by the following embodiments, but the scope of protection of the present invention is not limited to the embodiments. The physical property parameters in the embodiments are determined by the following methods.

[0027] Width of the annular seal

[0028] Place the filter vertically on a flat surface and use a flexible ruler with an accuracy of 0.5mm to measure the distance between the two folded edges of the sealing part on the inner and outer surfaces of the filter body. Measure three sets of data evenly and calculate the average value, which is the width of the annular sealing part.

[0029] Width of the ring-shaped filter element

[0030] Place the filter vertically on a flat surface, use a clamp to hold the edge of the sealing part, and remove the sealing part little by little. At the same time, use an adhesive remover to remove the adhesive from the circumferential part of the filter body. After the adhesive is removed, use a vernier caliper with an accuracy of 0.02mm to measure the distance from the inner ring to the outer ring of the filter body, that is, the width of the annular filter body. Measure three sets of data evenly and calculate the average value.

[0031] [The outer circumference of the lower part of the annular rigid support]

[0032] Place the annular rigid support horizontally on a flat surface, and use an electronic tape measure with an accuracy of 0.5 mm to measure the outer circumference of the lower part at the junction of the lower and upper surfaces of the support. The measured value is the outer circumference of the lower part of the annular rigid support.

[0033] [The outer circumference of the upper part of the annular rigid support]

[0034] Place the annular rigid support horizontally on a flat surface, and use an electronic tape measure with an accuracy of 0.5 mm to measure the outer circumference of the upper part of the support. The measured value is the outer circumference of the upper part of the annular rigid support.

[0035] [Inner circumference of the ring-shaped filter body]

[0036] Place the filter vertically on a flat surface and use an electronic measuring tape with an accuracy of 0.5mm to measure the circumference of the inner ring of the annular filter body. The measured value is the circumference of the inner ring of the annular filter body.

[0037] [Outer circumference of the ring-shaped filter body]

[0038] Place the filter body vertically on a flat surface, avoiding the upper and lower sealing parts. Use an electronic measuring tape with an accuracy of 0.5mm to measure the circumference of the outer ring of the annular filter body. The measured value is the outer circumference of the annular filter body. [The angle between the upper and lower halves of the outer ring of the annular rigid support section.]

[0039] Place the ring-shaped rigid support component horizontally, and use an angle gauge with an accuracy of 2′ to measure the angle between the upper and lower outer rings of the ring-shaped rigid support component. Measure three sets of data equally and calculate the average value.

[0040] The width of the lower part of the annular rigid support section.

[0041] Place the ring-shaped rigid support horizontally with the bottom of the support facing upwards. Use a vernier caliper with an accuracy of 0.02mm to measure the thickness from the inner side to the outer side of the bottom. Measure four sets of data evenly along the circumference of the bottom and calculate the average value.

[0042] Width of the welded area

[0043] Place the filter vertically on a flat surface, then press the filter element. After removing the coarse filter screen from the filter element, place it horizontally and use a vernier caliper with an accuracy of 0.02mm to measure the width of the welded part of the coarse filter screen. Measure three sets of data evenly and calculate the average value.

[0044] [Length of coarse filter]

[0045] Place the filter vertically on a flat surface, then press the filter element. After removing the coarse filter screen from the filter element, cut it along the seam and unfold it horizontally. Use an electronic tape measure with an accuracy of 0.5mm to measure the length of the coarse filter screen. Measure three sets of data evenly along the width direction and calculate the average value.

[0046] Width of the coarse filter

[0047] Place the filter vertically on a flat surface, then press the filter element and remove the coarse filter screen from the filter element. Use an electronic tape measure with an accuracy of 0.5mm to measure the width of the filter screen, and measure three sets of data evenly along the length direction, and calculate the average value.

[0048] Pressure loss and filtration efficiency

[0049] The evaluation sample was set up in the evaluation machine according to the JIS B9908 (2011) test method, and air was allowed to flow through the filter at a filter element flow velocity of 3.2 m / min. The pressure drop of the filter was calculated. Then, KCL particles were supplied from the upstream side, and the number of particles before and after the evaluation filter was measured using a particle counter. The filtration efficiency was calculated using the following formula: η=(1-(C0 / C1))×100,

[0050] C0: The number of particles with a diameter of 0.3–0.5 μm after evaluation of the filter.

[0051] C1: The number of particles with a diameter of 0.3–0.5 μm before the filter is evaluated.

[0052] The number of particles with a diameter of 0.3 to 0.5 μm here refers to the number of KCL particles contained within the 0.3 to 0.5 μm measurement range of the particle counter.

[0053] Example 1

[0054] (1) Preparation of the ring-shaped filter body: The charged meltblown nonwoven fabric is pleated to form a continuously bent V-shaped filter material. The two ends of the filter material are connected by a colloid to form a cylindrical three-dimensional structure. The width A of the ring-shaped filter body is 30mm, the circumference of the inner ring of the filter body is 628mm, and the circumference of the outer ring is 816.5mm.

[0055] (2) Preparation of the sealing part: Flexible EPDM foam with a width of 34mm is used;

[0056] (3) Preparation of the annular rigid support part: The lower part is injection molded with ABS resin into an annular support part with a width of 2mm. The ratio of the outer circumference of the upper part to the outer circumference of the annular filter body is 98%, and the ratio of the upper part to the inner circumference of the annular filter body is 127.4%. The ratio of the outer circumference of the lower part to the inner circumference of the annular filter body is 97%. The angle between the half-faces of the upper and lower outer circumferences is 108°.

[0057] (4) Filter preparation: The EPDM foam from step (2) is bonded to the upper and lower ring edges of the annular cylindrical part from step (1) using hot melt pressure-sensitive adhesive. Simultaneously, the excess portion of the EPDM foam is folded over, and the folded edges are bonded to the inner and outer ring surfaces of the filter body to form a filter element. The annular rigid support from step (3) is placed in the hollow part of the filter element under compressed conditions. When the filter needs to be installed, the annular rigid support is installed in the upper and lower inner ring positions of the filter element, and finally, it is expanded to form a cylindrical filter. The parameters and properties of the filter of this invention are shown in Table 1 below.

[0058] Example 2

[0059] The preparation process is the same as in Example 1. The parameters and properties of the filter of this utility model are shown in Table 1 below.

[0060] Example 3

[0061] The preparation process (1) to (3) is the same as in Example 2.

[0062] (4) Preparation of coarse filter screen: A non-woven mesh with a length of 883.9 mm and a width of 198 mm is made of PET fiber. The two ends of the mesh are spliced ​​by ultrasonic welding, and the width of the welded part is 2.0 mm. (5) Preparation of filter: The coarse filter screen from step (4) is fitted onto the outer surface of the filter element to form a cylindrical filter. The parameters and properties of the filter of this utility model are shown in Table 1 below.

[0063] Example 4

[0064] The preparation process is the same as in Example 3. The parameters and properties of the filter of this utility model are shown in Table 1 below.

[0065] Example 5

[0066] The preparation process is the same as in Example 4, except that the annular rigid support in step (3) is set to a square ring shape, and the filter is shaped into a square cylindrical filter; the parameters and properties of the filter of this utility model are shown in Table 1 below.

[0067] Example 6

[0068] The preparation process is the same as in Example 5, except that the annular rigid support is set in the lower inner ring of the annular filter body, and the filter is shaped into a cylindrical filter; the parameters and properties of the filter of this utility model are shown in Table 1 below.

[0069] Comparative Example 1

[0070] (1) Preparation of the ring-shaped filter body: The charged meltblown nonwoven fabric is pleated to form a continuously bent V-shaped filter material. The two ends of the filter material are connected by a colloid to form a cylindrical three-dimensional structure. The width A of the ring-shaped filter body is 30mm, the inner circumference of the filter body is 628mm, and the outer circumference is 816.5mm.

[0071] (2) Preparation of coarse filter screen: a non-woven mesh with a length of 821.5 mm and a width of 198 mm is made of PET fiber. The two ends of the length direction are spliced ​​by ultrasonic welding. The width of the welded part is 2.0 mm. (3) Preparation of ring-shaped rigid support part: a ring-shaped rigid support part with a width of 6 mm is injection molded with ABS resin. The ratio of the outer ring circumference of the upper part to the outer ring circumference of the ring filter body is 98%, and the ratio of the outer ring circumference of the upper part to the inner ring circumference of the ring filter body is 127.4%. The ratio of the outer ring circumference of the lower part to the inner ring circumference of the ring filter body is 97%. The half-face angle between the upper and lower outer rings is 108°.

[0072] (4) Preparation of the filter: The coarse filter screen from step (2) is placed on the outer surface of the annular filter body from step (1), and the annular rigid support from step (3) is placed on the inner ring of the upper and lower parts of the filter body to form a cylindrical filter. The parameters and properties of the filter are shown in Table 1 below.

[0073] Comparative Example 2

[0074] (1) Preparation of the ring-shaped filter body: The charged meltblown nonwoven fabric is pleated to form a continuously bent V-shaped filter material. The two ends of the filter material are connected by a colloid to form a cylindrical three-dimensional structure. The width A of the ring-shaped filter body is 30mm, the inner circumference of the filter body is 628mm, and the outer circumference is 816.5mm.

[0075] (2) Preparation of the sealing part: Flexible EPDM foam with a width of 34mm is used;

[0076] (3) Filter preparation: The EPDM foam from step (2) is bonded to the upper and lower ring edges of the annular cylindrical part from step (1) using hot melt pressure-sensitive adhesive. At the same time, the excess part of the EPDM foam is folded over, and the folded edges are bonded to the inner and outer ring surfaces of the filter body to form a filter element. The filter element is difficult to restore after compression and has an irregular shape. If it is forced into the purifier, it will block the air duct of the purifier. The parameters and properties of this filter are shown in Table 1 below.

[0077] Comparative Example 3

[0078] (1) Preparation of the ring-shaped filter body: The charged meltblown nonwoven fabric is pleated to form a continuously bent V-shaped filter material. The two ends of the filter material are connected by a colloid to form a cylindrical three-dimensional structure. The width A of the ring-shaped filter body is 30mm, the inner circumference of the filter body is 628mm, and the outer circumference is 816.5mm.

[0079] (2) Preparation of the sealing part: Flexible EPDM foam with a width of 34mm is used;

[0080] (3) Preparation of the annular rigid support part: The lower part of the annular rigid support part with a width of 2mm is injection molded with ABS resin. The ratio of the outer circumference of the upper part to the outer circumference of the annular filter body is 98%, and the ratio of the outer circumference of the upper part to the inner circumference of the annular filter body is 127.4%. The ratio of the outer circumference of the lower part to the inner circumference of the annular filter body is 97%. The half-face angle between the upper and lower outer circumferences is 108°.

[0081] (4) Preparation of coarse filter screen: A non-woven fabric mesh with a length of 821.5 mm and a width of 198 mm was made of PET fiber. The two ends of the mesh were spliced ​​by ultrasonic welding, and the width of the welded part was 2.0 mm. (5) Preparation of filter: The EPDM foam in step (2) was bonded to the upper and lower ring edges of the annular cylindrical part in step (1) by hot melt pressure-sensitive adhesive. At the same time, the excess part of the EPDM foam was folded over, and the folded edge was bonded to the inner and outer ring surfaces of the filter body to form a filter element. The annular rigid support part in step (3) was bonded to the upper and lower inner ring parts of the filter element by adhesive. The coarse filter screen in step (4) was fitted onto the outer surface of the filter element to form a cylindrical filter. The parameters and properties of the filter are shown in Table 1 below.

[0082] Table 1

[0083]

Claims

1. A filter, characterized in that: The filter includes an annular filter body (1), an annular sealing part (2), and an annular rigid support part (3). The annular sealing part (2) is fixed at both ends of the annular filter body (1) to form a filter element (4). The annular rigid support part (3) is located at one or both ends of the filter element (4). The annular rigid support part (3) is a detachable part. The annular filter body (1) and the annular sealing part (2) are deformable parts. The width A of the annular filter body (1) is 20-40 mm.

2. The filter according to claim 1, characterized in that: The width B of the annular sealing part (2) is greater than the width A of the annular filter body (1), and the difference is 2 to 10 mm.

3. The filter according to claim 1 or 2, characterized in that: The annular rigid support (3) has an upper part (3-1) and a lower part (3-2).

4. The filter according to claim 3, characterized in that: The ratio of the outer circumference of the lower part (3-2) of the annular rigid support (3) to the inner circumference of the annular filter body (1) is 96-99%.

5. The filter according to claim 3, characterized in that: The ratio of the outer circumference of the upper part (3-1) of the annular rigid support (3) to the outer circumference of the annular filter body (1) is 95-100%, and the ratio of the outer circumference to the inner circumference of the annular filter body (1) is 120-140%.

6. The filter according to claim 3, characterized in that: The angle between the outer half of the upper part (3-1) and the lower part (3-2) is 90-110°.

7. The filter according to claim 3, characterized in that: The width of the lower part (3-2) of the annular rigid support (3) is 2 to 6 mm.

8. The filter according to claim 1 or 2, characterized in that: The outermost layer of the filter is provided with a coarse filtration layer.

9. The filter according to claim 8, characterized in that: The two ends of the coarse filter layer are ultrasonically welded, and the width of the welded part is 2.0 to 5.0 mm.

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