JP2865330B2 - Air filter - Google Patents

Description

The present invention relates to an air filter incorporated in an air conditioner or the like.

(B) Prior art The applicant has proposed Japanese Patent Application No. 1-80139 as an example showing the structure of an air filter incorporated in an air conditioner.

In this proposal, opposing electrodes are arranged on the primary side and the secondary side of the filter element.

Then, by applying a voltage to the electrode, an electric field is created around the filter element, and the dust in the air flowing into the filter element is charged, so that the dust easily adheres to the filter element. Was.

(C) Problems to be Solved by the Invention Here, when the indoor humidity in summer is high, if an air conditioner incorporating this air filter is used, or if dust containing water adheres to this air filter, ,
Electricity flows because the insulation between the electrode on the primary side and the electrode on the secondary side of the filter element cannot be maintained.

For this reason, an attempt was made to cover at least one of these electrodes with an insulating material. However, since it is difficult to completely cover the end of the electrode with the insulating material (described later), electricity flows from this end. There is a risk. Due to this flow of electricity, the intensity of the electric field around the filter element was weakened, and dust sometimes became difficult to adhere to the filter element.

An object of the present invention is to maintain insulation of electrodes provided on a filter element and to suppress a decrease in the intensity of an electric field around the filter element.

(D) Means for Solving the Problems In order to achieve this object, the present invention relates to a filter element disposed in a ventilation path, and positive and negative electrodes disposed on the primary and secondary sides of the element. In an air filter for applying a voltage between these two electrodes to form an electric field in the filter element, the positive electrode is covered with an insulating material, and the insulating material is provided between the end of the positive electrode and the filter element. This is one in which an insulating cover provided separately is arranged.

(E) Function The positive electrode is covered with an insulating material, and an insulating cover is arranged between the end of the positive electrode and the filter element. With this insulating cover, the insulation between the positive electrode and the filter element is maintained.

(F) Embodiment In FIG. 4, reference numeral 1 denotes an indoor unit of a separation-type air conditioner, which is formed of a main body 2 and a front cover 3 attached to the front surface of the main body 2 to form a housing. 4 is a heat exchanger,
Reference numeral 5 denotes a blower, 6 denotes a wind direction changing plate, 7 denotes a pre-filter attached to the back surface of the front cover 3, and 8 denotes an air filter provided on the front surface of the heat exchanger 4. The rotation of the blower 5 causes the room air to flow as indicated by the solid arrow. That is, relatively large fibrous dust (wat dust) in the air sucked from the suction port 9 of the front cover 3 is removed by the pre-filter 7 and small dust is removed by the air filter 8. The air from which dust has been removed in this way is heated or cooled in the heat exchanger 4 and blown out from the discharge port 10.

The front cover 3 rotates obliquely upward as indicated by a chain line with the hinge 11 as a fulcrum, so that the air filter 8 can be removed from the main body 2.

Here, the air filter 8 has a structure as shown in FIG. In FIG. 1, reference numeral 12 denotes a main frame,
13 are formed. Reference numeral 14 denotes a stainless steel wire mesh-shaped negative electrode attached to the main frame, and reference numeral 15 denotes an electrode terminal of the negative electrode 14. Reference numeral 16 denotes a deodorizing filter stored in the main frame 12, which is formed by fixing granular activated carbon to a mesh urethane foam. Reference numeral 17 denotes a filter element (hereinafter, referred to as “charge filter”) mounted on the deodorizing filter 16.

The charging filter 17 includes a flat member 18 and a corrugated member 19.
Are laminated to form a large number of small holes 20 on the front and back surfaces.

Here, the flat plate member 18 is an adhesive tape, and the corrugated plate member 19 is a polypropylene nonwoven fabric (trade name: Syntex E) on which a charge is applied on a flat reinforcing net.
(L. Mitsui Petrochemical Industry Co., Ltd.) after heat-sealing and bending this into a waveform. 21 is the charging filter 17
Is a plastic insulating cover (insulator) that covers the edge of the camera. Reference numeral 22 denotes an auxiliary frame, 23 denotes a wire net-like positive electrode pressed by the auxiliary frame 22, and 24 denotes an electrode terminal of the positive electrode (positive electrode) 23. This positive electrode 23 is composed of a number of bar-shaped stainless steel (diameter 3 mm) 25
A number of bar-shaped stainless steels (diameter 3 mm) 26 are arranged in a vertical direction on top of each other, and after intersection points 27 of these are spot-welded, the upper left and upper right contact points 28 are masked and the insulating material is
29 (Product name: Epiform F-215. Somar Co., Ltd.)
Is coated.

Then, a negative electrode 14, a deodorizing filter 16,
After the charging filter 20, the insulating cover 21, and the plus electrode 23 are sequentially stacked, the auxiliary frame 22 is finally applied, and the periphery of the auxiliary frame 22 and the periphery of the main frame 12 are welded. By the combination of the two frames 22 and 12, the deodorizing filter 16 and the charging filter 17 are sandwiched between the two electrodes 14 and 23. At this time, the upper left and upper right contacts 28 of the plus electrode 23 (insulating material 29
Of the positive electrode 23 is in contact with the electrode terminal 24 of the auxiliary frame 22, and the end 30 of the positive electrode 23 is
It is applied to. The reason why the insulating cover 21 is provided in this manner is as follows. That is, even if the plus electrode 23 is covered with the insulating material 29, it is difficult to completely cover the end 30 of the electrode, and the end 30 may not be covered with the insulating material 29 (stainless steel may be exposed). This is because the end 30 (stainless steel) is square as shown in FIG.
Since the edge 29 is covered in a substantially circular shape so as to enclose the end 30, the corner 51 of the end may not be covered with the insulating material 29 or may be thin even if covered. Such end 30
Is covered by the insulating cover 21 so that the insulation of the positive electrode 23 is maintained for the time being. Therefore, the corners 31 corresponding to the contacts 28 of the positive electrode 23 have a large size for the cover 21.

In FIG. 3, reference numeral 32 denotes a rectifying high-voltage device,
A voltage of several KV is applied to 5,24. As a result, an electric field is formed between the electrodes 14 and 23, and the air dust between the electrodes is charged, so that the dust easily adheres to the charging filter 17.

When such an air filter 8 is incorporated in the indoor unit 1, room air flows through the air filter 8 as indicated by solid arrows (see FIG. 1). Therefore, the room air flows through the hole 20 of the charging filter 17. At this time, the small dust in the room air adheres to the inner wall of the hole 20. Then, the air from which small dust has been removed flows out of the holes 20 of the charging filter 17, the odor is collected by the deodorizing filter 16, and then the air is heated or cooled by the indoor heat exchanger 4 and blown out from the discharge port 10. Here, even if the humidity in the room is high or dust containing water enters the indoor unit 1 and the dust adheres to the charging filter 17, the positive electrode 23 is covered with the insulating material 29 and the insulating cover 21. Therefore, there is no possibility that electricity flows from the positive electrode 23, thereby suppressing a decrease in the intensity of the electric field around the charging filter 17,
Dust easily adheres to the charging filter 17.

The front cover 3 of the indoor unit 1 (see FIG. 4)
There is no danger of electric shock even if the user touches the plus electrode 23 by moving.

In the air filter 8 having such a structure, since the granular activated carbon fixed to the mesh urethane foam of the deodorizing filter 16 is conductive, when the granular activated carbon comes into contact with the negative electrode 14, the granular activated carbon also acts as a negative electrode. As a result, a voltage of several KV is applied between the charging filters 17. The negative electrode 14 may be provided between the deodorizing filter 16 and the charging filter 17.

(G) Effect of the Invention As described above, in the present invention, the positive electrode is covered with the insulating material, and the insulating cover provided separately from the insulating material is disposed between the end of the positive electrode and the filter element. Therefore, even if the end of the positive electrode protrudes from the insulating material and the end of the positive electrode is not completely covered with the insulating material, the insulation between the positive electrode and the filter element can be maintained by the insulating cover. it can. Therefore, the strength of the electric field around the filter element can be prevented from lowering, and the filter element can be kept so that dust easily adheres.

[Brief description of the drawings]

Drawings show an embodiment of the present invention, FIG. 1 is an exploded perspective view of an air filter, FIG. 2 is a sectional view of an end of an electrode of the air filter, FIG. 3 is a perspective view of the air filter, FIG. 4 is a sectional view of an indoor unit of the separation type air conditioner in which the air filter is incorporated. 8 ... air filter, 14, 23 ... electrode, 17 ... charged filter (filter element), 21 ... insulating cover, 29 ...
…Insulating material.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F24F 1/00 371 B03C 3/47

Claims (1)

(57) [Claims] 1. A filter element disposed in a ventilation path, and positive and negative electrodes disposed on a primary side and a secondary side of the element, and a voltage is applied between the two electrodes to apply an electric field to the filter element. Wherein the positive electrode is covered with an insulating material, and an insulating cover provided separately from the insulating material is disposed between an end of the positive electrode and the filter element. Air filter.