Filter frame structure with hot-melt adhesive molding frame

Abstract

The hot melt adhesive forming frame filter structure comprises a filter assembly and a fixing shell, the fixing shell is provided with a first through hole, an assembly groove and a second through hole which are communicated with each other, and a mounting opening is further formed in the side wall of the fixing shell and is communicated with the assembly groove, the filter assembly comprises a polyester fiber filter material mounted in the assembly groove and a polyolefin hot melt adhesive sealing frame, the polyolefin hot melt adhesive sealing frame is a thin-walled structure, is arranged at the edge of the polyester fiber filter material in a circumferential direction and is partially embeddedly combined with the polyester fiber filter material. The polyolefin hot melt adhesive sealing frame formed by solidification of the hot melt adhesive has good elasticity and strength, remains stable in structure during long-term use, is partially infiltrated and tightly combined with the polyester fiber filter material, effectively blocks air, improves the sealing property of the polyolefin hot melt adhesive sealing frame and the fixing shell, and thus improves the filtering effect.

Description

Technical Field

[0001] This disclosure relates to the technical field of air conditioning filter elements, and in particular to a filter frame structure with a hot melt adhesive molded frame. Background Technology

[0002] The air conditioner's filter structure includes a frame and a filter element installed inside the frame. The frame material is rigid polypropylene nonwoven fabric, and the filter element is polypropylene nonwoven fabric with pleats to filter the air.

[0003] The polypropylene nonwoven fabric frame is seamlessly bonded to the filter element inside the frame using hot melt adhesive to achieve a certain degree of sealing. The hot melt adhesive is either a polyolefin hot melt adhesive or a polyethylene-vinyl acetate copolymer hot melt adhesive. However, the polypropylene nonwoven fabric frame has relatively low strength and poor elasticity, resulting in poor sealing performance.

[0004] For example, an air conditioning filter disclosed in prior art CN201420672018.1 includes a filter surface and fixed frames on both sides thereof. The filter surface and each fixed frame are sealed and bonded together using hot melt adhesive. The filter surface consists of an upper non-woven fabric layer, a lower non-woven fabric layer, and a middle bamboo charcoal fiber layer. This air conditioning filter is made of non-woven fabric and fixed with hot melt adhesive. However, hot melt adhesive is prone to becoming brittle at low temperatures, which reduces the bonding strength between the hot melt adhesive and the frame. Furthermore, the frame of the air conditioning filter is made of rigid non-woven fabric, resulting in low frame strength and poor sealing at the frame. Utility Model Content

[0005] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a filter frame structure with a stable structure and improved sealing performance using hot melt adhesive molding.

[0006] The purpose of this disclosure is achieved through the following technical solution:

[0007] A filter frame structure with a hot melt adhesive molded frame includes a filter assembly and a fixing shell. The fixing shell has a first through hole, an assembly groove, and a second through hole that are connected to each other. The side wall of the fixing shell also has a mounting opening that communicates with the assembly groove. The assembly groove is used to install the filter assembly.

[0008] The filter assembly includes polyester fiber filter media and a polyolefin hot melt adhesive sealing frame. The polyester fiber filter media is folded to form multiple folds. The polyolefin hot melt adhesive sealing frame is obtained by curing polyolefin hot melt adhesive. The polyolefin hot melt adhesive sealing frame has a thin-walled structure and is disposed on the circumferential edge of the polyester fiber filter media. Part of the polyolefin hot melt adhesive sealing frame is embedded and combined with the polyester fiber filter media so that the polyolefin hot melt adhesive sealing frame is connected to the multiple folds as a whole. The polyolefin hot melt adhesive sealing frame and the polyester fiber filter media are installed in the assembly groove.

[0009] In one embodiment, the two opposing inner walls of the fixed shell are inclined toward the center of the fixed shell, so that the fixed shell forms an assembly groove with a trapezoidal inclined surface structure.

[0010] In one embodiment, the polyolefin hot melt adhesive sealing frame is provided with a sealing frame guide slope on the side opposite to the first through hole.

[0011] In one embodiment, the polyester fiber filter material covers the second through-hole.

[0012] In one embodiment, the projected surface of the polyolefin hot melt adhesive sealing frame along the direction of the first through hole is larger than the cross-section of the first through hole.

[0013] In one embodiment, the filter assembly further includes a connecting adhesive block, wherein crease transition areas are sequentially formed at the bends between the plurality of folds, the connecting adhesive block is cured and molded by polyolefin hot melt adhesive, and the connecting adhesive block is sequentially connected to each of the folds.

[0014] In one embodiment, the connecting adhesive block is vertically disposed in the crease transition area.

[0015] In one embodiment, the connecting adhesive block is disposed on the side of the polyester fiber filter material opposite to the second through hole.

[0016] In one embodiment, the polyolefin hot melt adhesive sealing frame is disposed parallel to the edges at both ends of the crease transition area.

[0017] In one embodiment, the fixed shell has a positioning mounting groove on one side opposite to the first through hole, and the positioning mounting groove is connected to the second through hole.

[0018] Compared with the prior art, this disclosure has at least the following advantages:

[0019] The aforementioned hot melt adhesive molded frame filter structure features a polyolefin hot melt adhesive sealing frame that exhibits excellent elasticity and strength. The frame's good bending resistance and resistance to breakage ensure structural stability during long-term use. The polyolefin hot melt adhesive sealing frame seals the installation opening, and its partial impregnation with the polyester fiber filter material effectively blocks air from passing through, improving the seal between the frame and the mounting shell, thereby enhancing the filtration efficiency of the filter structure. Furthermore, the use of a hot melt adhesive molded frame eliminates the need for additional adhesives or complex fixing steps; the polyolefin hot melt adhesive cures rapidly after heating, simplifying the manufacturing process and improving production efficiency. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 An exploded view of the filter frame structure of a hot melt adhesive molded frame according to an embodiment;

[0022] Figure 2 for Figure 1 A cross-sectional view of the filter frame structure shown in the hot melt adhesive molding frame;

[0023] Figure 3 for Figure 2 The enlarged view of the filter frame structure of the hot melt adhesive molded frame at point A;

[0024] Figure 4 for Figure 1 Another cross-sectional view of the filter frame structure of the hot melt adhesive molded frame shown. Detailed Implementation

[0025] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:

[0029] like Figures 1 to 4 As shown, this is a filter frame structure 10 of a hot melt adhesive molded frame according to an embodiment of the present disclosure, including a filter assembly 100 and a fixing shell 200. The fixing shell 200 has a first through hole 201, an assembly groove 202 and a second through hole 203 that are connected to each other. The side wall of the fixing shell 200 also has an installation opening 204 that is connected to the assembly groove. The first through hole 201 is used for air to flow in, the second through hole 203 is used for air to flow out, and the assembly groove 202 is used for installing the filter assembly 200.

[0030] Furthermore, the filter assembly 100 includes a polyester fiber filter material 110 and a polyolefin hot melt adhesive sealing frame 120. The polyester fiber filter material 110 is folded to form a plurality of folds 111. The polyolefin hot melt adhesive sealing frame 120 is cured and formed by polyolefin hot melt adhesive. The polyolefin hot melt adhesive sealing frame 120 is disposed on the circumferential edge of the polyester fiber filter material 110. A portion of the polyolefin hot melt adhesive sealing frame 120 is embedded and combined with the polyester fiber filter material 110 so that the polyolefin hot melt adhesive sealing frame 120 and the plurality of folds 111 are connected as one unit. The polyolefin hot melt adhesive sealing frame 120 and the polyester fiber filter material 110 are installed in the assembly groove 202.

[0031] In this embodiment, after heating, the polyolefin hot melt adhesive is applied to the periphery of the polyester fiber filter material 110. The polyolefin hot melt adhesive impregnates the polyester fiber filter material 110, and after curing, a polyolefin hot melt adhesive sealing frame 120 is formed, which is tightly bonded to the polyester fiber filter material 110. The processing can be automated, simplifying the manufacturing process. The polyolefin hot melt adhesive sealing frame 120, formed by curing the polyolefin hot melt adhesive, has good elasticity and strength. The polyester fiber filter material 110 is installed inside the polyolefin hot melt adhesive sealing frame 120. The hot melt adhesive sealing frame 120 connects multiple folds 111 to form a filter assembly 100. The filter assembly 100 is installed in the assembly groove 202 through the installation opening 204. The polyolefin hot melt adhesive sealing frame 120 fits tightly against the inner wall of the assembly groove 202. With the matching sealing installation opening 204 of the polyolefin hot melt adhesive sealing frame 120, when air passes through the polyester fiber filter material 110, the air cannot pass through the polyolefin hot melt adhesive sealing frame 120, so that the filter frame structure 10 of the hot melt adhesive molded frame has a better filtration effect.

[0032] The aforementioned hot melt adhesive molded frame filter frame structure 10, with its polyolefin hot melt adhesive sealing frame 120 cured by hot melt adhesive, possesses good elasticity and strength. The hot melt adhesive molded frame exhibits good bending resistance and is not easily broken, ensuring the filter frame structure 10 maintains structural stability during long-term use. The polyolefin hot melt adhesive sealing frame 120 seals the installation opening 204, and part of the polyolefin hot melt adhesive sealing frame 120 is tightly bonded to the polyester fiber filter material 110, effectively blocking air from passing through the polyolefin hot melt adhesive sealing frame 120. This improves the sealing performance between the polyolefin hot melt adhesive sealing frame 120 and the fixed shell 200, thereby enhancing the filtration effect of the hot melt adhesive molded frame filter frame structure 10. Using a hot melt adhesive molded frame eliminates the need for additional adhesives or complex fixing steps; the polyolefin hot melt adhesive cures quickly after heating, simplifying the manufacturing process and improving the production efficiency of the hot melt adhesive molded frame filter frame structure 10.

[0033] like Figure 2 and Figure 3 As shown, in one embodiment, the two opposing inner walls of the fixing shell 200 are inclined towards the center of the fixing shell, so that the fixing shell 200 forms a trapezoidal inclined surface structure assembly groove 202. In this embodiment, the filter assembly 100 is installed in the assembly groove 202, the filter assembly 100 self-aligns, and the two opposing inclined inner walls lock the filter assembly 100, so that the position of the filter assembly 100 is fixed after installation, thereby improving the sealing performance between the filter assembly 100 and the fixing shell 200.

[0034] Furthermore, such as Figure 3As shown, in one embodiment, a limiting buckle 210 protrudes from the inner wall of the first through hole 201, and a housing guide slope 211 is provided on the side 203 of the fixed shell 200 opposite to the second through hole. In this embodiment, when the filter assembly 100 is installed in the assembly groove 202, the polyolefin hot melt adhesive sealing frame 120 of the filter assembly 100 first contacts the housing guide slope 211, so that the polyolefin hot melt adhesive sealing frame 120 can be installed through the first through hole 201. The housing guide slope 211 guides the polyolefin hot melt adhesive sealing frame 120 to slide into the assembly groove 202, reducing the risk of damage between the filter assembly 100 and the fixed shell 200.

[0035] like Figure 3 As shown, in one embodiment, the polyolefin hot melt adhesive sealing frame 120 has a sealing frame guide slope 121 on the side opposite to the first through hole 201. In this embodiment, the sealing frame guide slope 121 can guide the installation of the polyolefin hot melt adhesive sealing frame 120 and facilitates the differentiation of the installation direction of the filter assembly 100, thereby facilitating the installation of the polyolefin hot melt adhesive sealing frame 120 in the assembly groove 202.

[0036] like Figure 2 and Figure 4 As shown, in one embodiment, the polyester fiber filter material 110 covers the second through-hole 203. In this embodiment, after air enters the first through-hole 201, it is filtered by the polyester fiber filter material 110 before entering the second through-hole 203. The polyester fiber filter material 110 can effectively capture impurities such as dust, particulate matter, and bacteria in the air. The polyester fiber filter material 110 covering the second through-hole 203 makes the polyester fiber filter material 110 fit more tightly with the fixed shell 200, thereby reducing the problem of air entering the second through-hole 203 through the gap between the polyester fiber filter material 110, the polyolefin hot melt adhesive sealing frame 120, and the fixed shell 200.

[0037] like Figure 1 and Figure 2 In one embodiment, the projected surface of the polyolefin hot melt adhesive sealing frame 120 is larger than the first through hole 201. In this embodiment, the projected surface of the polyolefin hot melt adhesive sealing frame 120 is larger than the first through hole 201, ensuring that the polyolefin hot melt adhesive sealing frame 120 completely covers the edge of the first through hole 201 and avoids gaps.

[0038] like Figure 1 and Figure 3As shown, in one embodiment, the filter assembly 100 further includes a connecting adhesive block 130. A crease transition area 112 is sequentially formed at the bends between the plurality of folds 111. The connecting adhesive block 130 is cured and formed using polyolefin hot melt adhesive, and is sequentially connected to each of the folds 111. In this embodiment, when the polyester fiber filter material 110 is folded to form a plurality of folds 111, the crease transition area 112 at the bend of the fold 111 is a relatively weak point in the structure, easily deformed by external forces. The polyolefin hot melt adhesive is heated and applied to the surface of the polyester fiber filter material 110, then cured to form the connecting adhesive block 130. The connecting adhesive block 130 sequentially connects the plurality of crease transition areas 112, increasing the number of connection points between the plurality of folds 111, thereby reducing the deformation between the plurality of folds 111 and improving the overall structural stability and durability of the polyester fiber filter material 110.

[0039] like Figure 1 As shown, in one embodiment, the connecting adhesive block 130 is vertically disposed on the crease transition area 112. In this embodiment, the connecting adhesive block 130 is connected to the crease transition area 112, and the connecting adhesive block 130 is vertically disposed on the crease transition area 112, which makes the stress stability between the polyester fiber filter material 110 and the connecting adhesive block 130 better, thereby reducing the deformation of the polyester fiber filter material 110.

[0040] like Figure 3 As shown, in one embodiment, the connecting adhesive block 130 is disposed on the side of the polyester fiber filter material 110 opposite to the second through hole 203. In this embodiment, when the connecting adhesive block 130 is located on one side of the first through hole 201, the operator can quickly distinguish the orientation of the filter assembly 100, making the installation orientation of the filter assembly 100 accurate, thereby speeding up the installation of the filter assembly 100.

[0041] like Figure 1 As shown, in one embodiment, the polyolefin hot melt adhesive sealing frame 120 is arranged parallel to the edges at both ends of the crease transition area 112. In this embodiment, the polyolefin hot melt adhesive sealing frame 120 is arranged parallel to the edges at both ends of the crease transition area 112, which effectively restricts the movement of the folded portion 111, enhances the stability of the entire polyester fiber filter material 110 structure, fixes the shape and size of the filter assembly 100, and thus allows the filter assembly 100 to be accurately installed into the assembly groove 202.

[0042] like Figure 4As shown, in one embodiment, the fixing shell 200 has a positioning mounting groove 205 on one side opposite to the first through hole 201, and the positioning mounting groove 205 communicates with the second through hole 201. In this embodiment, the positioning mounting groove 205 is used to limit and fix the fixing shell 200. The fixing shell 200 is installed at a fixed position in the automotive air conditioning system. The positioning mounting groove 205 fits tightly with the installation structure of the automotive air conditioning system, ensuring the stability of the filter assembly 100 inside the fixing shell 200.

[0043] In one embodiment, the polyolefin hot melt adhesive comprises the following components by weight:

[0044]

[0045] The elastic structure formed after the polyolefin elastomer is cured allows it to maintain its flexibility even at low temperatures, resulting in good elasticity, low-temperature resistance, and flexural strength of the polyolefin hot melt adhesive. Consequently, the polyolefin hot melt adhesive sealing frame has good low-temperature resistance and bending resistance. The polyester fiber filter material, polyolefin elastomer, and polypropylene wax are all propylene-based, which results in good wetting between the polyolefin hot melt adhesive and the polyester fiber filter material. After the polyolefin hot melt adhesive melts, it impregnates the polyester fiber filter material and fills the gaps in the polyester fiber filter material, forming a mechanical anchor, thereby increasing the bonding strength between the polyolefin hot melt adhesive and the polyester fiber filter material.

[0046] In one embodiment, the method for preparing a polyolefin hot melt adhesive sealing frame includes the following steps:

[0047] Polypropylene wax, tackifying resin, and antioxidant are added to a reaction vessel and mixed and heated at a temperature of 150℃-160℃ to obtain an intermediate mixture.

[0048] The polyolefin elastomer is gradually added to the intermediate mixture and stirred rapidly until it is evenly mixed to obtain the molten rubber.

[0049] The molten rubber compound is subjected to vacuuming at a temperature of 140℃-160℃ and a vacuum degree of -0.08 to -0.1 MPa to obtain a mixed rubber compound.

[0050] After cooling and discharging the mixed rubber compound, a polyolefin hot melt adhesive is obtained.

[0051] The polyolefin hot melt adhesive is melted and then applied to the edge of the polyester fiber filter material to form a polyolefin hot melt adhesive sealing frame. First, polypropylene wax, tackifying resin, and antioxidant are mixed to ensure rapid dispersion of these components, preventing agglomeration in the high-viscosity elastomer melt. Polyolefin elastomer is gradually added to control the amount added, thereby obtaining a polyolefin hot melt adhesive with good low-temperature resistance and brittleness resistance. After melting, the polyolefin hot melt adhesive is applied to the polyester fiber filter material. Upon curing, it forms a polyolefin hot melt adhesive sealing frame with good flexural strength. This allows the polyolefin hot melt adhesive to penetrate and fill the gaps in the polyester fiber filter material, creating mechanical anchoring and increasing the bond strength between the polyolefin hot melt adhesive and the polyester fiber filter material.

[0052] Compared with the prior art, this disclosure has at least the following advantages:

[0053] The aforementioned hot melt adhesive molded frame filter frame structure 10, with its polyolefin hot melt adhesive sealing frame 120 cured by hot melt adhesive, possesses good elasticity and strength. The hot melt adhesive molded frame exhibits good bending resistance and is not easily broken, ensuring the filter frame structure 10 maintains structural stability during long-term use. The polyolefin hot melt adhesive sealing frame 120 seals the installation opening 204, and part of the polyolefin hot melt adhesive sealing frame 120 is tightly bonded to the polyester fiber filter material 110, effectively blocking air from passing through the polyolefin hot melt adhesive sealing frame 120. This improves the sealing performance between the polyolefin hot melt adhesive sealing frame 120 and the fixed shell 200, thereby enhancing the filtration effect of the hot melt adhesive molded frame filter frame structure 10. Using a hot melt adhesive molded frame eliminates the need for additional adhesives or complex fixing steps; the polyolefin hot melt adhesive cures quickly after heating, simplifying the manufacturing process and improving the production efficiency of the hot melt adhesive molded frame filter frame structure 10.

[0054] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A filter frame structure with a hot melt adhesive molded frame, comprising a filter assembly and a fixing shell, wherein the fixing shell has a first through hole, an assembly groove, and a second through hole that are connected to each other, and the side wall of the fixing shell also has an installation opening, the installation opening communicating with the assembly groove, the assembly groove being used to install the filter assembly, characterized in that, The filter assembly includes polyester fiber filter media and a polyolefin hot melt adhesive sealing frame. The polyester fiber filter media is folded to form multiple folds. The polyolefin hot melt adhesive sealing frame is obtained by curing polyolefin hot melt adhesive. The polyolefin hot melt adhesive sealing frame has a thin-walled structure and is disposed on the circumferential edge of the polyester fiber filter media. Part of the polyolefin hot melt adhesive sealing frame is embedded and combined with the polyester fiber filter media so that the polyolefin hot melt adhesive sealing frame is connected to the multiple folds as a whole. The polyolefin hot melt adhesive sealing frame and the polyester fiber filter media are installed in the assembly groove.

2. The filter frame structure of the hot melt adhesive molded frame according to claim 1, characterized in that, The two inner walls of the fixed shell are inclined toward the center of the fixed shell so that the fixed shell forms an assembly groove with a trapezoidal inclined surface structure.

3. The filter frame structure of the hot melt adhesive molded frame according to claim 1, characterized in that, The polyolefin hot melt adhesive sealing frame is provided with a sealing frame guide slope on the side opposite to the first through hole.

4. The filter frame structure of the hot melt adhesive molded frame according to claim 1, characterized in that, The polyester fiber filter material covers the second through hole.

5. The filter frame structure of the hot melt adhesive molded frame according to claim 1, characterized in that, The projected surface of the polyolefin hot melt adhesive sealing frame along the direction of the first through hole is larger than the cross-section of the first through hole.

6. The filter frame structure of the hot melt adhesive molded frame according to claim 1, characterized in that, The filter assembly also includes connecting adhesive blocks, and crease transition areas are sequentially formed at the bends between the plurality of folds. The connecting adhesive blocks are cured and molded by polyolefin hot melt adhesive, and the connecting adhesive blocks are sequentially connected to each of the crease transition areas.

7. The filter frame structure of the hot melt adhesive molded frame according to claim 6, characterized in that, The connecting adhesive block is vertically positioned in the crease transition area.

8. The filter frame structure of the hot melt adhesive molded frame according to claim 6, characterized in that, The connecting adhesive block is disposed on the side of the polyester fiber filter material opposite to the second through hole.

9. The filter frame structure of the hot melt adhesive molded frame according to claim 6, characterized in that, The polyolefin hot melt adhesive sealing frame is arranged parallel to the edges at both ends of the crease transition area.

10. The filter frame structure of the hot melt adhesive molded frame according to claim 1, characterized in that, The fixed shell has a positioning and mounting groove on one side away from the first through hole, and the positioning and mounting groove is connected to the second through hole.

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