Air filter provided with guide pin and adaptively mounted in inner cavity of assembly

Abstract

The utility model relates to the technical field of air filters, and particularly discloses an air filter which is adaptively mounted in an assembly inner cavity and is provided with a guide pin. The frame at least partially surrounds the periphery of the filter paper, the filter paper comprises a first filter paper part and a second filter paper part, and the second filter paper part is lower than the first filter paper part; the frame at least comprises a first edging connected to one end of the filter paper and a second edging connected to the other end of the filter paper, and the first edging and the second edging are equal in height; after the filter paper is installed in the assembly, a guide pin of the assembly is inserted between the first edge strip and the second edge strip and located above the second filter paper part. The filter paper is designed into the first filter paper part and the second filter paper part which have the height difference, and the second filter paper part close to one side of the assembly guide pin is lower, so that an avoiding space is provided for the assembly guide pin, normal installation is facilitated, the filtering area of the filter paper is reserved, the internal space can be utilized to the maximum extent, and the service life of the filter paper is prolonged. The filtering area is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of air filters, and specifically discloses an air filter which is suitable for being installed in an inner cavity of an assembly and has a guide pin. Background Art

[0002] The filter element structure of an air filter is generally composed of folded filter paper and side strips surrounding the outer periphery of the folded filter paper. It is installed in the assembly of the filter device to achieve the effect of filtering dust and other particulate matter in the air during ventilation. Some existing assemblies have rod-shaped guide pins in the positions for installing filter elements inside the assembly, which serve to guide the filter element when it is installed in the assembly so that the filter element can be correctly installed in the ventilation position in the assembly. Therefore, some filter elements with special structures specifically designed to adapt to the shape of this type of assembly have come into being.

[0003] For example, German patent DE102005048841B3 discloses an air filter for a motor vehicle ventilation system, wherein in the internal space of the assembly, the air filter installation position has a guide pin, and when the filter is inserted into the assembly along its longitudinal axis, the guide pin needs to be sunk into the guide hole in the filter. By the shape of the air filter installation position and the complementary shape of the air filter, the air filter can play an internal sealing role after being installed in the assembly.

[0004] But the disadvantages of this air filter are:

[0005] (1) It is necessary to form guide holes (openings or slots) on the frame of the filter for the guide pins to be inserted into, which increases the processing technology;

[0006] (2) In order to avoid the formation of the guide hole and the insertion of the guide pin of the assembly, the distance between each fold of the filter paper (i.e., the pleat distance) needs to be enlarged. When the guide hole is formed on the frame using a cutter and the guide pin is inserted into the assembly, the distance between each two folds can avoid the cutter and the guide pin to prevent damage to the filter paper. However, due to the enlarged distance between the filter paper, the stability of the filter paper is reduced after the ventilation volume is increased, which may cause the filter paper to shake and other problems, affecting the overall quality of the product.

[0007] (3) If the process of increasing the spacing between each fold is not adopted, the filter paper needs to be made into an irregular fold shape (widening the width of two fold positions) at the positions corresponding to the guide holes to avoid the guide pins of the tool and the assembly. This structural design makes the folding process of the filter paper more complicated, which not only reduces production efficiency but also increases labor costs;

[0008] (4) The air filter must be precisely fitted to the corresponding assembly guide pins, which requires high production precision and is difficult to mass produce.

[0009] Therefore, it is necessary to develop an air filter with a structure that is convenient for mass production so that the air filter can be advantageously matched with the interference contour existing inside the assembly, while still having good stability and filtering effect without reducing the filtering area. Utility Model Content

[0010] The utility model aims to overcome the deficiencies of the prior art and provide an air filter with a guide pin which is suitable for being installed in the inner cavity of an assembly.

[0011] The utility model discloses an air filter having a guide pin adapted to be installed in an inner cavity of an assembly, and adopts the following technical solution:

[0012] An air filter with a guide pin adapted to be installed in an inner cavity of an assembly, comprising filter paper and a frame at least partially surrounding the outer periphery of the filter paper, wherein the filter paper comprises a first filter paper portion and a second filter paper portion, the height of the second filter paper portion being lower than the height of the first filter paper portion; the frame comprises at least a first side strip connected to one end of the filter paper, and a second side strip connected to the other end of the filter paper, the first side strip and the second side strip being of the same height; after the filter paper is installed in the assembly, the guide pin of the assembly is inserted between the first side strip and the second side strip, and is located above the second filter paper portion.

[0013] Preferably, the filter paper is wavy pleated filter paper.

[0014] Preferably, the first filter paper portion and the second filter paper portion are folded integrally.

[0015] Preferably, the first filter paper portion and the second filter paper portion are folded into shape respectively and then pasted together.

[0016] Preferably, foam is provided on the periphery of the frame.

[0017] Preferably, the foam is arranged at the outer peripheral bottom edge of the frame, and the height of the foam is not higher than the height of the second filter paper part.

[0018] Preferably, a third side strip is provided on a side of the first filter paper portion away from the second filter paper portion, and the third side strip, the first side strip and the second side strip are of the same height.

[0019] Preferably, a fourth side strip is provided on a side of the second filter paper portion away from the first filter paper portion, and the height of the fourth side strip is not higher than that of other side strips; or, no border is provided on a side of the second filter paper portion away from the first filter paper portion.

[0020] Compared with the prior art, the utility model has at least the following beneficial effects:

[0021] 1. By designing the filter paper into a first filter paper part and a second filter paper part with a height difference, the height of the second filter paper part close to the guide pin of the assembly is made lower, so as to provide a space for the guide pin of the assembly, which is convenient for normal installation. Not only does it not require hole opening processing, which improves production efficiency, but also retains the filtering area of ​​this part of the filter paper. Therefore, the internal space can be utilized to the maximum extent and the filtering area can be increased. In addition, since there is no need to increase the folding spacing of the filter paper to facilitate processing and installation, the folding spacing of the filter paper can be uniformly designed to be smaller, which reduces the production difficulty and improves the stability and filtering effect of the filter paper.

[0022] 2. By designing the first side strip and the second side strip to be of equal height along the length direction, the frame height does not change with the height of the filter paper, that is, the frame is of equal height along the length direction, which is convenient for batch cutting of the frame. When the frame and the filter paper are combined, only one edge pasting operation is required, which simplifies the process and reduces the processing difficulty;

[0023] 3. Since the frame height does not change with the filter paper height, that is, the frame has the same height along the length direction, it not only increases the overall strength of the product, but also achieves a better adaptation effect with the assembly and improves the sealing after being combined with the assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of an air filter having a guide pin adapted to be installed in the inner cavity of the assembly according to this embodiment;

[0025] Figure 2 Another perspective structural diagram of the air filter with a guide pin adapted to be installed in the inner cavity of the assembly according to the present embodiment;

[0026] Figure 3 A partial perspective view of an air filter having a guide pin adapted to be installed in the inner cavity of the assembly according to the present embodiment;

[0027] Figure 4 for Figure 3 A magnified view of;

[0028] Figure 5 This is a schematic diagram of the installation of an air filter having a guide pin adapted to be installed in the inner cavity of the assembly according to the present embodiment;

[0029] Figure 6 This is a schematic diagram of the air filter after installation which is adapted to be installed in the inner cavity of the assembly and has a guide pin.

[0030] Description of Figure Numbers:

[0031] 1. Filter paper; 11. First filter paper portion; 12. Second filter paper portion; 2. Frame; 21. First side strip; 22. Second side strip; 23. Third side strip; 24. Fourth side strip; 3. Foam; 4. Guide pin. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] This embodiment discloses an air filter having a guide pin adapted to be installed in the inner cavity of an assembly, referring to Figure 1-6 , which includes a filter paper 1 and a frame 2 at least partially surrounding the outer periphery of the filter paper 1, the filter paper 1 includes a first filter paper portion 11 and a second filter paper portion 12, the height of the second filter paper portion 12 is lower than the height of the first filter paper portion 11; the frame 2 at least includes a first side strip 21 connected to one end of the filter paper 1, and a second side strip 22 connected to the other end of the filter paper 1, the first side strip 21 and the second side strip 22 are of the same height; after the filter paper 1 is installed in the assembly, the guide pin 4 of the assembly is inserted between the first side strip 21 and the second side strip 22, and is located above the second filter paper portion 12.

[0034] By designing the filter paper to have a height difference, the height of the second filter paper part 12 close to the side of the assembly guide pin 4 is lowered, the guide hole structure for inserting the guide pin on the existing air filter is removed, and instead the surface of the second filter paper part 12 on one side of the air filter that can be abutted by the guide pin 4 for guiding the installation is used, and the size of the air filter itself is matched with the size of the assembly inner cavity to provide installation guidance and positioning after installation, thereby providing a clearance space for the guide pin 4 to facilitate normal installation, and retaining the filtration area of ​​this part of the filter paper. As a result, the internal space can be utilized to the maximum extent, the filtration area is increased, and there is no need for the filter element to be opened as in the prior art, thereby greatly improving the production efficiency. In addition, since there is no need to enlarge the folding spacing of the filter paper to make way for the opening processing, the folding spacing of the filter paper can be uniformly designed to be smaller, making it less likely for the filter paper to shake during ventilation, thereby improving the stability of the filter paper and the filtering effect. By setting the heights of the first side strip 21 and the second side strip 22 to be equal along the length direction, the heights of the first side strip 21 and the second side strip 22 do not change with the height of the filter paper 1, that is, the frame 2 is equal along the length direction, which is convenient for batch cutting of the frame 2. When the frame 2 and the filter paper 1 are combined, only one edge bonding operation is required, the process is simple, the processing difficulty is reduced, and it is conducive to the mass production of the product. In addition, the frame 2 is equal in length direction, which not only increases the overall strength of the product, but also achieves a better adaptation effect with the assembly, thereby improving the sealing after being combined with the assembly.

[0035] In this embodiment, the filter paper 1 is specifically a wavy folded filter paper, and the first filter paper portion 11 and the second filter paper portion 12 are folded and formed as a whole, that is, the height difference between the first filter paper portion 11 and the second filter paper portion 12 is formed by changing the folding height. Although this structure has a certain degree of folding operation difficulty, the overall strength is higher. In other embodiments, the first filter paper portion 11 and the second filter paper portion 12 can be folded and formed separately, and then the two are pasted together. Subsequently, the first side strip 21 and the second side strip 22 surround the first filter paper portion 11 and the second filter paper portion 12 on both sides, further strengthening the first filter paper portion 11 and the second filter paper portion 12 that are folded and formed separately. This structure has low folding operation difficulty and can also have good overall strength after the first side strip 21 and the second side strip 22 are surrounded.

[0036] In this embodiment, a circle of foam 3 is arranged around the outer periphery of the frame 2, and the foam 3 elastically deforms and abuts against the inner cavity of the assembly, which not only plays a sealing role, but also improves the installation stability of the filter paper 1 in the assembly. As a preferred solution, the foam 3 is arranged at the outer peripheral bottom edge of the frame 2, and the height of the foam 3 is not higher than the height of the second filter paper part 12, so that the filter paper 1 is installed in the assembly more smoothly. Of course, since the foam 3 has deformation elasticity, even if the foam 3 is higher than the second filter paper part 12, it will not affect the installation and use, and will not interfere with the assembly guide pin 4.

[0037] In this embodiment, a third side strip 23 is provided on the side of the first filter paper portion 11 away from the second filter paper portion 12, and the third side strip 23, the first side strip 21 and the second side strip 22 are of the same height. In this way, the first side strip 21, the second side strip 22 and the third side strip 23 can be cut as a whole and pasted to the periphery of the filter paper 1, thereby improving the assembly efficiency and the overall structural strength of the filter paper 1.

[0038] In this embodiment, a fourth side strip 24 may be provided on the side of the second filter paper portion 12 away from the first filter paper portion 11, and the height of the fourth side strip 24 is not higher than the height of other side strips, so that the overall structural strength of the filter paper 1 can be further improved, and an opening for inserting the guide pin 4 is ensured on the side of the second filter paper portion 12 away from the first filter paper portion 11, so as not to affect the matching installation of the filter paper 1 and the guide pin 4 in the assembly. Of course, in other embodiments, the side of the second filter paper portion 12 away from the first filter paper portion 11 may not be surrounded by a frame, and the first side strip 21 and the second side strip 22 are arranged on both sides of the filter paper 1 to be sufficient to meet its structural strength.

[0039] The technical solution provided by the utility model is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation mode of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. At the same time, for general technicians in this field, according to the idea of ​​the utility model, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. An air filter having a guide pin adapted to be installed in an inner cavity of an assembly, comprising filter paper and a frame at least partially surrounding the outer periphery of the filter paper, characterized in that: The filter paper includes a first filter paper portion and a second filter paper portion, the height of the second filter paper portion is lower than the height of the first filter paper portion; the frame includes at least a first side strip connected to one end of the filter paper, and a second side strip connected to the other end of the filter paper, the first side strip and the second side strip are of equal height along the length direction; after the filter paper is installed in the assembly, the guide pin of the assembly is inserted between the first side strip and the second side strip, and is located above the second filter paper portion.

2. The air filter having a guide pin adapted to be installed in the inner cavity of the assembly according to claim 1, characterized in that: The filter paper is a wavy folded filter paper.

3. The air filter having a guide pin adapted to be installed in the inner cavity of the assembly according to claim 2, characterized in that: The first filter paper portion and the second filter paper portion are folded into one piece.

4. The air filter having a guide pin adapted to be installed in the inner cavity of the assembly according to claim 2, characterized in that: The first filter paper portion and the second filter paper portion are folded into shape respectively and then pasted together.

5. The air filter having a guide pin adapted to be installed in the inner cavity of the assembly according to claim 1, characterized in that: The periphery of the frame is provided with foam.

6. The air filter having a guide pin adapted to be installed in the inner cavity of the assembly according to claim 5, characterized in that: The foam is arranged at the outer bottom edge of the frame, and the height of the foam is not higher than the height of the second filter paper portion.

7. The air filter having guide pins adapted to be installed in the inner cavity of the assembly according to claim 1, characterized in that: A third side strip is disposed on one side of the first filter paper portion away from the second filter paper portion, and the third side strip, the first side strip and the second side strip are of the same height.

8. The air filter having guide pins adapted to be installed in the inner cavity of the assembly according to claim 1, characterized in that: A fourth side strip is provided on a side of the second filter paper portion away from the first filter paper portion, and a height of the fourth side strip is not higher than heights of other side strips; or, no border is provided on a side of the second filter paper portion away from the first filter paper portion.

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