TWI835563B - filter box - Google Patents

Abstract

A filter box is provided with two opposite side plates and two opposite connecting plates around an internal space. Each of the two side plates has a side plate main body, and a surrounding piece extends inward from the periphery of each side plate main body, and is located on the bottom side of each surrounding piece. A buckle extends upward from the edge. Each buckle has a plurality of buckle grooves spaced front and back. Each buckle groove has two convex buckles on both sides of the top entrance. Snap between the opposite pairs of buckle grooves at the bottom of the two side panels. The cover is connected to a plurality of upper covers spaced front and back between the tops of the two surrounding pieces of the two side panels; when the present invention is used, a plurality of filter elements are arranged between the upper covers and the lower covers, and the air can only be filtered through the filter elements. Since the lower cover is connected to the two side panels in a snap-fit manner, the trouble and time of adjusting the alignment of the lower cover and fixing the lower cover can be saved.

Description

filter box

The present invention relates to the structure of a box; in particular, it relates to a filter box.

Existing air purifiers are provided with a plurality of air-blocking filter elements inside a box, and are combined with a plurality of strip-shaped covers at the air inlets and air outlets of the box to seal the filter elements within the box. When the air is filtered by the air purifying device, the air flow is allowed to pass through the gaps between the covers and the filter elements to achieve the effect of filtering and purifying the passing air.

Although the above-mentioned air purifying device has the effect of filtering clean air, when assembling the cover body of the box, it is necessary to align each cover body with the matching filter element, and then combine each cover body with the box body with rivets to fix them one by one. The process of assembling the covers to the box is cumbersome and time-consuming, and cannot speed up the production of the air purifier.

In view of this, the object of the present invention is to provide a filter box in which at least part of the cover system is buckled to the box, thereby saving the trouble and assembly of aligning and riveting the cover to the box. time to speed up the manufacturing and production of filter boxes.

In order to achieve the above object, the present invention provides a filter box, which includes two side plates, two connecting plates, a plurality of lower covers, and a plurality of upper covers. The two side panels are opposite to each other and each has a main body of one side panel. A surrounding piece extends from the periphery of the main body of each side panel in the direction of the main body of the other side panel. A buckle extends upward from the edge of the bottom side of each surrounding piece. Each buckle has a plurality of Each buckle groove has a bottom edge, two sides connected to the bottom edge, and two convex buckles protruding inward from the top sides of the two sides.

The two connecting plates are each connected between the front edge of the two side plates and between the rear edge of the two side plates, forming a filter element installation space inside the two connecting plates and the two side plates. A plurality of lower covers are spaced from front to back and each is a strip cover body extending in the left and right directions. The left and right ends of each lower cover are buckled in the opposite pairs of buckling grooves on the bottom of the two side panels, thereby connecting to the two sides. between the bottom of the wrap piece. A plurality of upper covers are spaced from front to back and each is a strip cover body extending in the left and right directions. The left and right ends of each upper cover are connected between the tops of the two surrounding pieces.

When the present invention is used, a plurality of filter elements are arranged in the filter element arrangement space, and the filter elements filter the air passing through to achieve the effect of air purification. The effect of the present invention is that the left and right ends of the lower covers are buckled in the opposite pairs of buckling grooves on the bottom of the two side plates. Through the aforementioned buckle structure, the lower covers can be quickly installed in the correct position between the bottoms of the two side panels. There is no need to adjust the position of each lower cover and the filter element, and there is no need to use additional fixing parts to secure the lower covers. The cover is fixed to the two side plates, thus saving the trouble of positioning the cover and riveting it to the box and the assembly time, and speeding up the manufacturing and production of the filter box.

In order to illustrate the present invention more clearly, the preferred embodiments are described in detail below along with the drawings. Please refer to FIGS. 1 to 5B , which is a filter box 100 according to the first preferred embodiment of the present invention. It includes two side plates 10 , two connecting plates 20 , three lower covers 30 , and four upper covers 40 , wherein:

The two side panels 10 are arranged oppositely on the left and right and each has a side panel main body 12. Each side panel main body 12 is a rectangular plate body. The upper and lower positions and the front and rear positions of each side panel main body 12 have two long sides and two short sides. A surrounding piece 14 extends from the periphery of each side panel main body 12 toward the direction of the other side panel main body 12. Each surrounding piece 14 is a long rectangular piece, and a buckle piece 16 extends upward from the edge of the bottom side of each surrounding piece 14. Each buckle The piece 16 is a piece extending in the front and rear direction, and is provided with three front and back spaced buckle grooves 18 according to the number of the three lower covers 30. Each buckle groove 18 has a bottom edge 181 and two sides 182 connecting the bottom edge 181. , and two convex buckles 183 protruding inward from the top sides of the two sides 182 , the bottom side 181 is adjacent to the edge of the bottom side of the surrounding piece 14 , the buckle grooves 18 of each side panel 10 are in contact with the other side panel 10 The buckle grooves 18 are arranged oppositely on the left and right. In other preferred embodiments, each buckle piece 16 can also be provided with a plurality of other buckle grooves 18 , such as two or four, depending on the number of the lower cover 30 .

The two connecting plates 20 are respectively connected between the front end edges of the two side panels 10 and between the rear end edges of the two side panels 10 . In the first preferred embodiment, each connecting plate 20 is connected to the two side plates 10 in a screw locking manner. In other preferred embodiments, each connecting plate 20 and the two side plates 10 can also be connected by rivets, welding or gluing. A filter element installation space A is formed around the inner sides of the two connecting plates 20 and the two side plates 10 . The filter element installation space A is a space that passes through in the up and down direction.

The lower covers 30 are arranged in a spaced manner from front to back. Each lower cover 30 is a strip cover extending in the left and right direction. Each lower cover 30 has a lower cover plate 32 and two lower side strips connected to the front and rear edges of the lower cover plate 32 . 34. The left and right ends of each lower cover 30 are buckled into the opposite left and right pair of buckling grooves 18 at the bottom of the two side panels 10, so that each lower cover 30 is connected between the bottoms of the two surrounding pieces 14. In the first preferred embodiment, each buckle groove 18 is set as a trapezoidal groove and an entrance 184 is formed between two protruding buckles 183. The angle between each side 182 of each buckle groove 18 and each protruding buckle 183 is is an acute angle θ.

Each lower cover 30 matches the shape of each pair of buckling grooves 18 , and the outline around each lower cover 30 is also set to a trapezoidal outline. That is to say, the contours around the lower cover 32 and the two lower side strips 34 are set to match the contours around the buckle grooves 18 so that the two ends of each lower cover 30 can pass through each inlet respectively after being compressed in the front and rear direction. 184 enters each buckle groove 18 and then returns to its original shape and is fixed. In other preferred embodiments, the number of lower covers 30 can be set to other plural numbers, such as two or four, and in order to increase the tightness of the combination between each lower cover 30 and each buckle groove 18 , please refer to FIG. 8 . In other preferred embodiments, a protruding point 185 can be formed at the end of the two protruding buttons 183 of each buckle groove 18 in the direction of the bottom edge 181 . The end of each lower cover 30 comes out of the buckle groove 18 through the inlet 184 .

The upper covers 40 are arranged at intervals from front to back. Each upper cover 40 is a strip-shaped cover body extending in the left and right direction. Each upper cover 40 has an upper cover plate 42 and two upper side strips 44 connected to the front and rear edges of the upper cover plate 42 . The left and right ends of each upper cover 40 are connected between the tops of the two surrounding pieces 14 so that the upper covers 40 are located on the top side of the filter element installation space A, and the lower covers 30 are located on the bottom side of the filter element installation space A. In this preferred implementation, both ends of each upper cover 40 are connected between the tops of the two surrounding pieces 14 by rivets. In other preferred embodiments, the two ends of each upper cover 40 can also be connected to the top sides of the two surrounding pieces 14 through other combination means such as screw locking, welding or gluing. And the number of the upper covers 40 can be changed accordingly with the number of the lower covers 30 , and the number of the upper covers 40 can be set to other plural numbers, such as three or five.

Please refer to Figures 3 to 7. When the above-mentioned first preferred embodiment of the present invention is used, eight plate-shaped filter elements 50 are fixed in the filter element arrangement space A, and any two filter elements 50 in front and behind are fixed to each other. The filter elements 50 are placed in opposite inclined directions, so that the bottoms of the filter elements 50 are brought together in pairs and embedded in each lower cover 30 , and the tops of the filter elements 50 are brought together in pairs and embedded in each upper cover 40 for fixation. In other preferred embodiments, the number of the filter elements 50 increases or decreases as the number of the lower covers 30 and the upper covers 40 changes. For example, when there are two lower covers 30 and three upper covers 40 , , because the filter element installation space A is provided with six filter elements 50.

Specifically, when the lower covers 30 , the filter elements 50 and the upper covers 40 are not assembled between the two side plates 10 and the connecting plates 20 , the two side plates 10 will not be completely locked with the two connecting plates 20 but will The two side plates 10 and the two connecting plates 20 can be slightly opened outward. In this way, the lower covers 30 , the filter elements 50 and the upper covers 40 can be sequentially placed between the two side plates 10 and the two connecting plates 20 for assembly. After the lower covers 30 , the filter elements 50 and the upper covers 40 After the assembly is completed, lock the two side plates 10 and the two connecting plates 20. In addition, in order to increase the air tightness of the filter elements 50 for filtering air, between the lower covers 30 and the filter elements 50 , between the upper covers 40 and the filter elements 50 , and between the filter elements 50 and the surrounding The gaps between the two side panels 10 and the two connecting panels 20 are filled with air-tight foaming caulking agent, so that when the air flows through the filter box 100, it can only pass through the filter elements 50 to achieve a good air filtering effect. .

Please refer to FIG. 9 . In addition to the bottom edge 181 of each buckle groove 18 being adjacent to the edge of the bottom side of the surrounding piece 14 , the buckle grooves 18 can also be set to a shallower depth. In this case, each buckle The bottom edge 181 of the groove 18 is set to be spaced apart from the edge of the bottom side of the surrounding piece 14. A blocking piece 186 is formed between the bottom edge 181 of each buckle groove 18 and the edge of the bottom side of the surrounding piece 14, so that the buckles can be matched with each other. When the groove 18 becomes shallower and the height of each lower cover 30 changes, its end portion can be buckled between the bottom edge 181 of each buckle groove 18 , both sides 182 and the two convex buckles 183 . When the foaming caulking agent is filled between the lower covers 30 and the filter elements 50 , the baffle portion 186 formed on the bottom side of each buckle groove 18 can prevent the foaming caulking agent from passing through the lower cover. The gap between 30 and each buckle groove 80 leaks out.

Please refer to FIG. 2B and FIG. 5A to FIG. 7 to further illustrate the structure of the filter elements 50 combined with the filter element installation space A in the first preferred embodiment of the present invention. An inclined strip 60 is connected to the front and rear ends of the inner surface of the side plate main body 12 of each side plate 10 . Seven V-shaped frames are connected to the inner surface of each side plate main body 12 between the two inclined strips 60 . 62. Any two adjacent V-shaped frames 62 are in an upside-down state. Between any two adjacent V-shaped frames 62 , between the frontmost V-shaped frame 62 and the front inclined strip 60 , and between the rearmost A filter element track 64 is each formed between the V-shaped frame 62 and the inclined strip 60 on the rear side.

Each of the filter elements 50 is disposed between the opposite pairs of filter element rails 64 on the left and right sides of the two side panels 10. The bottom sides of the filter element rails 64 are brought together in pairs at the positions of the buckle grooves 18, so that the filter elements 50 that are brought together there are The two filter elements 50 are partially embedded in the lower cover 30 , and the top sides of the filter element tracks 64 are brought together in pairs, so that the parts of the two filter elements 50 that are close together are embedded in the upper cover 40 , so that the filter elements 50 block the filter elements. Set up space A. Each buckle 16 has a notch 161 at its front and rear ends, and an L-shaped bar 22 extending in the left and right directions is connected to the bottom edge of each connecting plate 20. The left and right ends of each L-shaped bar 22 extend into the left and right sides. In each pair of opposite notches 161, the top and bottom ends of the frontmost filter element 50 are respectively disposed between the frontmost upper cover 40 and the front L-shaped bar 22, and the top and bottom ends of the rearmost filter element 50 are respectively disposed. Between the rearmost upper cover 40 and the rear L-shaped bar 22 . Through the design of the above-mentioned V-shaped frame 62, a guide rail can be formed for the installation of the filter element 50, which has the effect of accurate and standardized installation and improving the assembly efficiency of the filter box. In addition, the structural strength of the side plate 10 can also be improved to reduce the occurrence of pressure deformation of the filter box.

In addition to the above-mentioned first preferred embodiment, the present invention is provided with left and right buckle grooves 18 opposite to each other at the bottom of the two side panels 10, so that the two ends of the lower covers 30 are respectively buckled in each pair of buckle grooves 18. In other preferred embodiments, another buckle piece 16 can also be extended downward from the edge of the top side of each surrounding piece 14. The other buckle piece 16 has a plurality of other buckle grooves 18 spaced front and back in accordance with the number of the upper cover 40. Each other buckle groove 18 has another bottom edge 181, the other two sides 182 connecting the other bottom edge 181, and the other two protruding buckles 183 protruding inward from the bottom sides of the other two sides 182, and make The left and right ends of each upper cover 40 are buckled into the opposite left and right locking grooves 18 on the top of the side panel 10 , so that the left and right ends of each upper cover 40 are connected between the tops of the two side panels 10 .

Please refer to the second preferred embodiment of the present invention shown in Figures 10 to 13. The difference from the above-mentioned first preferred embodiment is that the bottom edge 181 of each buckle groove 18 of the filter box 100 is set to have a deeper depth. In the shallow state, the bottom edge 181 of each buckle groove 18 is spaced from the edge of the bottom side of the surrounding piece 14, and the above-mentioned baffle portion 186 is formed between them. Both sides of the bottom edge 181 are divided into two inclined sides 1811. The two inclined sides 1811 sandwich a superior angle θ2 less than 270 degrees on the top side. The superior angle is defined as an angle that is greater than the straight angle (180-degree angle) and less than the circumferential angle (360-degree angle).

In the second preferred embodiment, each lower cover 30 cooperates with each buckle groove 18 to become shallower and shortened in height. Each lower cover 30 cooperates with the two inclined sides 1811 of each buckle groove 18 to separate both sides of its lower cover plate 32. The angle between the top sides of the two lower cover side portions 321 is equivalent to the above-mentioned angle θ2. When the end of each lower cover 30 is buckled in each buckle groove 18, The two lower cover side portions 321 are against the two inclined edges 1811 of each buckle groove 18. The degree of inclination of the two lower cover plate side portions 321 is to match the bottom surfaces of the two filter elements 50 inserted obliquely into the two adjacent filter element tracks 64. In each filter element 50 is inserted into each filter element track 64, the bottom surface of each filter element 50 can be pressed against the side portion 321 of each lower cover plate to achieve a better sealing effect.

Similarly, in the second preferred embodiment, both sides of the upper cover plate 42 of each upper cover 40 are also divided into two upper cover plate side portions 421. The angle between the bottom sides of the two upper cover plate side portions 421 is equivalent to the above-mentioned angle. The optimal angle θ2 is such that when each upper cover plate 42 is connected between the tops of the two surrounding pieces 14, the two upper cover plate side portions 421 of each upper cover plate 42 can reach a higher level with the top surfaces of the two mating filter elements 50. Best sealing effect.

In addition to the above-mentioned first preferred embodiment of the present invention, the lower cover plate 32 of each lower cover 30 is made into a flat plate shape, or as in the above-mentioned second preferred embodiment, the lower cover plate 32 of each lower cover 30 is made into a flat plate shape. In addition to the two inclined lower cover side portions 321, the third preferred embodiment of the present invention as shown in Figure 14 can also be provided in the middle of each lower cover 30, specifically, in the middle of each lower cover 30. An upwardly convex punching line 322 is formed in the center of each lower cover 32 by punching. Each punching line 322 extends linearly along the left and right directions and is located between the left and right ends of each lower cover 32 . By forming each punching line 322 on each lower cover 32 , the strength of each lower cover 30 can be enhanced. The rest of the structure, installation method, and functions of the third preferred embodiment of the present invention are the same as those described in the above-mentioned first preferred embodiment.

Through the design of the plate inclination angle of the upper cover plate 32 and/or the lower cover plate 42 in the above-mentioned second and third embodiments, the inclination angle of the installed filter element 50 can be matched, thereby effectively lowering the filter element 50 and the upper cover 40 and/or the amount of sealant used between the lower cover 30, in addition to improving the structural strength of the upper cover 40 and/or the lower cover 30.

The above are only the best possible embodiments of the present invention. Any equivalent changes made by applying the description and patent scope of the present invention should be included in the patent scope of the present invention.

[Invention] 100:Filter box 10:Side panel 12: Side panel main body 14:surround film 16: buckle piece 161: Notch 18:Buckle groove 181: Bottom 1811:Sloped edge 182:Side 183:Protruding buckle 184:Entrance 185:Bump 186:Baffle part 20:Connection board 22: L-shaped bar 30: Lower cover 32:Lower cover 321: Side of lower cover 322: Stamping line 34: Lower side strip 40: Upper cover 42: Upper cover 421: Side of upper cover 44: Top side strips 50: filter element 60: Inclined bar 62: V-shaped frame 64:Filter track A:Filter element setting space θ: acute angle θ2: optimal angle

Figure 1 is a perspective view of the first preferred embodiment of the present invention. FIG. 2A is an exploded view of FIG. 1 . Figure 2B is an exploded view of the two side plates and two connecting plates of the first preferred embodiment. Figure 2C is an enlarged view of the portion marked 2C in Figure 2A. Figure 3 is an assembly diagram of the first preferred embodiment. Figure 4 is a top view of the first preferred embodiment. FIG. 5A is a cross-sectional view along the direction 5A-5A in FIG. 4 . Figure 5B is an enlarged view of the portion marked 5B in Figure 5A. Figure 6 is a schematic diagram of an assembled filter element according to the first preferred embodiment of the present invention. Figure 7 is a schematic diagram of the upper cover assembled according to the first preferred embodiment of the present invention. Figure 8 is a schematic diagram of arranging protrusions on the protruding buckle of the buckle groove according to the present invention. Figure 9 is a schematic diagram of forming a baffle portion in a buckle groove according to the present invention. Figure 10 is a perspective view of the second preferred embodiment of the present invention. Figure 11 is an assembly diagram of the second preferred embodiment. Figure 12 is a schematic cross-sectional view of the lower cover assembled in the second preferred embodiment. Figure 13 is an enlarged view of the portion marked 13 in Figure 12 . Figure 14 is an assembly diagram of the third preferred embodiment.

100:Filter box

10:Side panel

16: buckle piece

18:Buckle groove

20:Connection board

22: L-shaped bar

30: Lower cover

40: Upper cover

50: filter element

Claims (9)

A filter box, including: two side panels, opposite to each other on the left and right, each with a side panel main body, a surrounding piece extending from the periphery of each side panel main body in the direction of the other side panel main body, and a buckle extending upward from the edge of the bottom side of each surrounding piece Each buckle piece has a plurality of buckle grooves spaced front and back, and each buckle groove has a bottom edge, two sides connected to the bottom edge, and two convex buckles protruding inward from the top sides of the two sides; Two connecting plates are each connected between the front edge of the two side plates and between the rear edge of the two side plates, forming a filter element installation space inside the two connecting plates and the two side plates; a plurality of lower covers are connected to the front and rear There are strip-shaped covers arranged at intervals and extending in the left and right directions. The left and right ends of each lower cover are buckled in the opposite pairs of buckling grooves at the bottom of the two side plates, thereby connecting between the bottoms of the two surrounding pieces. ; And a plurality of upper covers, which are spaced front and back and each is a strip cover extending in the left and right directions. The left and right ends of each upper cover are connected between the tops of the two surrounding pieces; wherein each side of each buckle groove The angle between each buckle is an acute angle, an entrance is formed between the two buckles of each buckle groove, and the end of each lower cover enters each buckle groove through the entrance. The filter box of claim 1, wherein the ends of the two protruding buckles of each buckle groove each form a protruding point toward the bottom edge. A filter box, including: two side panels, opposite to each other on the left and right, each with a side panel main body, a surrounding piece extending from the periphery of each side panel main body in the direction of the other side panel main body, and a buckle extending upward from the edge of the bottom side of each surrounding piece Each buckle piece has a plurality of buckle grooves spaced front and back, and each buckle groove has a bottom edge, two sides connected to the bottom edge, and two convex buckles protruding inward from the top sides of the two sides; Two connecting plates, each connected between the front edge of the two side plates and between the rear edge of the two side plates, forming a filter element installation space inside the two connecting plates and the two side plates; A plurality of lower covers are spaced from front to back and are strip-shaped covers extending in the left and right directions. The left and right ends of each lower cover are buckled into the opposite pairs of buckling grooves at the bottom of the two side panels, thereby connecting to the between the bottoms of the two surrounding pieces; and a plurality of upper covers, which are spaced back and forth and each is a strip cover extending in the left and right directions, and the left and right ends of each upper cover are connected between the tops of the two surrounding pieces; The buckle groove is a trapezoidal groove, and each lower cover has a lower cover plate and two lower side strips connected to the front and rear edges of the lower cover plate. The contours around the lower cover plate and the two lower side strips match the contours around each buckle slot. The filter box as described in claim 3, wherein both sides of the bottom edge of each buckle groove are divided into two inclined sides, and the angle between the top sides of the two inclined sides is an angle less than 270 degrees; each lower cover The two sides of the lower cover plate are divided into two lower cover plate side parts according to the two inclined sides of each buckle groove. The angle between the top sides of the two lower cover plate side parts is an optimal angle less than 270 degrees. When the ends of the lower cover are buckled into the buckling grooves, the side portions of the two lower covers abut against the two inclined edges. The filter box as claimed in claim 4, wherein each upper cover has an upper cover plate and two upper side strips connected to the front and rear edges of the upper cover plate, and both sides of each upper cover plate are divided into two upper cover plate side parts. The angle between the bottom sides of the two upper cover plates is an angle less than 270 degrees. A filter box, including: two side panels, opposite to each other on the left and right, each with a side panel main body, a surrounding piece extending from the periphery of each side panel main body in the direction of the other side panel main body, and a buckle extending upward from the edge of the bottom side of each surrounding piece Each buckle piece has a plurality of buckle grooves spaced front and back, and each buckle groove has a bottom edge, two sides connected to the bottom edge, and two convex buckles protruding inward from the top sides of the two sides; Two connecting plates, each connected between the front edge of the two side plates and between the rear edge of the two side plates, forming a filter element installation space inside the two connecting plates and the two side plates; A plurality of lower covers are spaced from front to back and are strip-shaped covers extending in the left and right directions. The left and right ends of each lower cover are buckled into the opposite pairs of buckling grooves at the bottom of the two side panels, thereby connecting to the between the bottoms of the two surrounding pieces; and a plurality of upper covers, which are spaced back and forth and each is a strip cover extending in the left and right directions. The left and right ends of each upper cover are connected between the tops of the two surrounding pieces; Each of the front and rear ends of the inner surface of the main body of the side panel is combined with an inclined strip, and a plurality of V-shaped frames are combined with a plurality of V-shaped frames arranged in a spaced manner in the front and back at the portion of the inner surface of the main body of each side plate located between the two inclined strips. Each V-shaped frame is in an upside-down state, between any two adjacent V-shaped frames at the front and rear, between the frontmost V-shaped frame and the front inclined strip, and between the rearmost V-shaped frame and the rear inclined strip. A filter element track is formed between each pair of filter element tracks, and a filter element is arranged between each pair of filter element tracks facing each other on the left and right sides of the two side panels. Part of the filter element is embedded in the lower cover, the top sides of the filter element tracks are brought together in pairs, and the parts of the two filter elements that are brought together there are embedded in the upper cover, and the filter elements block the installation space of the filter element; The front and rear ends of each buckle each have a notch, and an L-shaped bar extending in the left and right direction is connected to the bottom edge of each connecting plate. The left and right ends of each L-shaped bar extend into the opposite left and right ends. In the recess; the top and bottom ends of the frontmost filter element are respectively arranged between the frontmost upper cover and the front L-shaped bar, and the top and bottom ends of the rearmost filter element are respectively arranged between the rearmost upper cover and the front L-shaped bar. Between the upper cover and the L-shaped bar on the rear side. The filter box according to any one of claims 1 to 6, wherein a punching line extending linearly in the left and right directions is formed in the middle of each lower cover, and each of the punching lines is located at both left and right ends of each lower cover. between. A filter box includes: two side panels, opposite to each other on the left and right, each having a side panel main body, a surrounding piece extending from the periphery of each side panel main body in the direction of the other side panel main body, and a surrounding piece extending upward from the edge of the bottom side of each surrounding piece. Each buckle has a plurality of buckle grooves spaced front and back. Each buckle groove has a bottom edge, two sides connected to the bottom edge, and two convex buckles protruding inward from the top sides of the two sides. ; Two connecting plates, each connected between the front edge of the two side plates and between the rear edge of the two side plates, forming a filter element installation space inside the two connecting plates and the two side plates; a plurality of lower covers, The front and back are spaced apart and each is a strip-shaped cover body extending in the left and right directions. The left and right ends of each lower cover are buckled in the opposite pairs of buckling grooves at the bottom of the two side panels, thereby connecting to the bottom of the two surrounding pieces. between; and a plurality of upper covers, which are spaced from front to back and each is a strip cover extending in the left and right directions. The left and right ends of each upper cover are connected between the tops of the two surrounding pieces; among them, the edge of the top side of each surrounding piece Another buckle extends downward, and the other buckle has a plurality of other buckle grooves spaced back and forth. Each of the other buckle grooves has another bottom edge, the other two sides connecting the other bottom edge, and the other buckle piece. Two other convex buckles protrude inward from the bottom sides of the other two sides; the left and right ends of each upper cover are buckled into another pair of opposite buckle grooves on the top of the two side panels, thereby connecting the left and right ends of each upper cover. between the tops of the two surrounding pieces. A filter box, including: two side panels, opposite to each other on the left and right, each with a side panel main body, a surrounding piece extending from the periphery of each side panel main body in the direction of the other side panel main body, and a buckle extending upward from the edge of the bottom side of each surrounding piece Each buckle piece has a plurality of buckle grooves spaced front and back, and each buckle groove has a bottom edge, two sides connected to the bottom edge, and two convex buckles protruding inward from the top sides of the two sides; Two connecting plates are each connected between the front edge of the two side plates and between the rear edge of the two side plates, forming a filter element installation space inside the two connecting plates and the two side plates; a plurality of lower covers are connected to the front and rear There are strip-shaped covers arranged at intervals and extending in the left and right directions. The left and right ends of each lower cover are buckled in the opposite pairs of buckling grooves at the bottom of the two side plates, thereby connecting between the bottoms of the two surrounding pieces. ;as well as A plurality of upper covers are spaced from front to back and each is a strip-shaped cover body extending in the left and right directions. The left and right ends of each upper cover are connected between the tops of the two surrounding pieces; wherein the bottom edge of each buckle groove is in contact with the surrounding piece. The edges on the bottom side of the sheet are spaced apart to form a blocking piece between each bottom edge and the edge surrounding the bottom side of the sheet.