JP2757607B2 - Air filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air filter provided with an electrostatic filter.

[0002]

2. Description of the Related Art Conventionally, this type of air filter has a configuration as shown in FIGS. Hereinafter, the configuration will be described with reference to the drawings. As shown in the figure, a blower 2 such as a cross-flow fan, a high-voltage power supply 3, an air filter 5 inserted into a guide 4, and the like are provided in the air cleaner body 1. The high-voltage power supply 3 is wired so that a voltage can be applied to the air filter 5. Then, the dirty air passes through the air filter 5 from the intake port 6 and is discharged from the discharge port 7 as shown by the arrow A. Further, as shown in FIG. 4, the air filter 5 has a pleated electrostatic filter 8, the fold of which is fixed by a hot melt 9 and mounted on a resin case (not shown).

[0003]

However, in the above-mentioned conventional configuration, the electrostatic filter 8 is fixed by the hot melt 9 in order to maintain the fold of the electrostatic filter 8, so that the electrostatic filter 8 is heated by the heat of the hot melt 9. There is a drawback that the charging is reduced, the production is difficult, and the man-hour is required.

[0004] The present invention is intended to solve the above conventional problems, and an object thereof is to provide a high-performance and inexpensive air filter strong positional deviation at the time of luck搬時or drop.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an outer frame formed by a lower case and a flat upper lid having a ventilation hole, and a pleat having a recess mounted in the outer frame. And at least two of the lower case and the upper lid at locations other than the ventilation holes.
A welding projection is provided on the top , the welding projection is inserted into the recess of the electrostatic filter, the entire frame including the welding projection is ultrasonically welded, and the lower case, the upper lid and the electrostatic filter are integrated. Have.

[0006]

In the above configuration, the pre-charge of the electrostatic filter is performed.
The lower case, the upper lid, and the electrostatic filter can be integrated because the projection is inserted into the trough-shaped recess and welded by ultrasonic welding.

[0007]

An embodiment of the present invention will be described below with reference to FIG. As shown in the drawing, the outer frame 11 is formed by a lower case 12 and a flat upper lid 14 having a ventilation hole 13, and the lower case 12 is provided with a welding projection 15. An electrostatic filter 17 having a pleated recess 16 is mounted in the outer frame 11, and the electrostatic filter 17 is an electret mainly composed of polypropylene resin.
Further, the welding projection 15 is inserted into the concave portion 16 of the electrostatic filter 17 and is brought into contact with the inner surface of the upper lid 14, and the lower case 12, the upper lid 14 and the electrostatic filter 17 are integrated by ultrasonic welding. The protrusion 15 may be provided on the upper lid 14,
If the height is at least half the folding pleat of the electrostatic filter 17, deformation and displacement can be prevented. Ultrasonic welding part 1
8 is not fully welded, and even if it is a partial weld 19, sufficient strength against impact due to transportation or dropping can be obtained.

[0008] In the above configuration, by inserting the projection 15 into the recess 16 of the electrostatic filter 17 Ri by the ultrasonic welding, the lower case 12, but filter with integrated lid 14 and the electrostatic filter 17 Ru obtained, In order to avoid exposure to high temperatures in the manufacturing process after the electrostatic filter 17 is mounted in the outer frame 11
Since the ultrasonic welding of the electrostatic filter is performed only on the protrusions 15, the dust collecting performance is excellent , the position displacement during transportation or dropping is strong, and the assembly process can be simplified.

FIG. 2 shows another embodiment. In each of the drawings, the components denoted by the same reference numerals as those in the above-described embodiment are the same components. The difference from the above-described embodiment is that a high-voltage electrode and a low-voltage electrode are provided so as to sandwich an electrostatic filter, and a deodorizing filter is provided. That is, 20a, 20
Reference symbol b denotes a high-voltage electrode and a low-voltage electrode made of a conductive net such as an electric wire, a wire mesh, or a polymer resin containing carbon, and is connected to the high-voltage contact fitting 21a and the low-voltage contact fitting 21b. 2
Reference numeral 2 denotes a deodorizing filter in which activated carbon is attached to foamed polyurethane or non-woven fabric. ing. Further, the holding projections 23b are provided near the welding projections 15 to enhance the impact resistance against transportation and dropping. When the electrostatic filter 17 is large in the width direction or the pitch direction, deformation and displacement of the electrostatic filter 17 can be prevented by increasing the pressing projections 23a and 23b. As described above, the deodorizing filter 22 is sandwiched between the electrostatic filter 17 and the lower case 12 and does not move. Neither does the deodorizing filter 22 have a large contact resistance with the electrostatic filter 17 so that it can be transported without ultrasonic welding. Has impact resistance to falling.

[0010]

As is apparent from the above embodiment, the air filter of the present invention has an outer frame formed by a flat upper lid having a lower case and a ventilation hole, and a pleat having a recess mounted in the outer frame. At least two of the lower case and the upper lid at a location other than the ventilation hole.
The welding projections provided on the reason, the welding protrusions of including the entire frame <br/> ultrasonic welding to the lower case this welding projection is inserted into the recess of the electrostatic filter, integral top cover and electrostatic filter This configuration makes it possible to collect dust.
It is excellent in performance and resistant to displacement during transportation and dropping, and can be manufactured at high performance and at low cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of an air filter according to an embodiment of the present invention.

2A is a plan view of an air filter according to another embodiment of the present invention, and FIG. 2B is a cross-sectional view of the air filter taken along line AA in FIG. 2A.

FIG. 3 is a cross-sectional view of a conventional air purifier.

FIG. 4 is a perspective view of the air filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Outer frame 12 Lower case 13 Ventilation hole 14 Upper lid 15 Welding projection 16 Recess 17 Electrostatic filter

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B03C 3/00-3/88 B01D 39/00-39/20 B01D 46/00-46/54

Claims (3)

(57) [Claims] And 1. A plate-shaped outer frame formed by the upper lid with the lower case and the vents, and a pleated electrostatic filter having a recess mounted on the outer frame, of the lower case or the upper lid At least two places that are not ventilation holes
An air filter in which a welding protrusion is provided on the upper surface , the welding protrusion is inserted into a concave portion of the electrostatic filter, the entire frame including the welding protrusion is ultrasonically welded, and a lower case, an upper lid, and an electrostatic filter are integrated. . 2. The air filter according to claim 1, wherein a high-voltage electrode and a low-voltage electrode are provided so as to sandwich the electrostatic filter. 3. The air filter according to claim 1, wherein a deodorizing filter is provided between the lower case and the electrostatic filter.