JPH03140723A - Air filter - Google Patents

Abstract

PURPOSE:To keep an insulation of an electrode and restrict a reduction of a magnetic force around a filter element by a method wherein the electrode arranged in the filter element is covered by an insulating material and an end part of the electrode is covered by an insulation cover. CONSTITUTION:A plus electrode 23 of an air filter 8 of a separate type air conditioner is constructed such that several stainless steel rods 26 are arranged in a longitudinal direction on several stainless steel rods 25 arranged in a lateral direction, their crossing points 27 are spot welded, thereafter the upper left and upper right contact points 28 are masked and then the insulation materials 29 are covered. A minus electrode 14 of stainless steel not, a deodoring filter 16, an electrical charged filter 20 having a flat-plate like member 18 and a corrugated member 19 adhered to each other and overlapped from each other and having several small holes 20 at its front and rear surfaces, an insulation cover 21 covering an edge of the filter and a plus electrode 23 are piled in sequence on a main frame 12, thereafter an auxiliary frame 22 is abutted to them and then a circumference of the auxiliary frame and a circumference of the main frame 12 are welded to each other. At this time, the upper right and left crossing points 28 of the plus electrode 23 are brought into contact with the electrode terminal 24 of the auxiliary frame 22 and further the end pert 30 of the plus electrode 23 is made to abut against the insulation cover 21.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an air filter incorporated into an air conditioner or the like.

(b) Prior Art The applicant had proposed Japanese Patent Application No. 1-80139 as showing the structure of an air filter incorporated into an air conditioner.

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

By applying a voltage to this electrode, an electric field is created around the filter element, which charges the dust in the air that has flowed into the filter element, making it easier for the dust to adhere to the filter element. Ta.

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

For this reason, we tried to coat at least one of these electrodes with an insulating material, but since it is difficult to completely cover the end of this electrode with an insulating material (described later), electricity flows from this end. There is a risk. This flow of electricity weakens the strength of the electric field (magnetic force) around the filter element, making it difficult for dust to adhere to the filter element. The purpose is to maintain the insulation of the filter element and suppress the decrease in magnetic force around the filter element.

(:) Means for Solving the Problems In order to achieve this object, the present invention covers the electrodes provided in the filter element with an insulating material, and the ends of the electrodes are covered with an insulating cover. be.

(e) Since the end of the working electrode is covered with an insulating cover, even if there is a portion of this end that is not covered with insulating material, insulation is maintained by this insulating cover.

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

The front cover 3 pivots diagonally upward as shown by the dashed-dotted line arrow using the hinge 11 as a fulcrum, and 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, and a handle 13 is formed at the bottom thereof. Reference numeral 14 designates a negative electrode in the form of a wire mesh made of stainless steel attached to this main frame, and reference numeral 15 designates an electrode terminal of this negative electrode 14. 16 is this main frame 12
A deodorizing filter stored inside the mesh urethane filter.
4, the granular activity is avoided. 17 is a filter element (
Hereinafter, it will be referred to as a "charged filter."

This charged filter 17 is made by laminating a flat plate-like member 18 and a corrugated plate-like member 19, and has a large number of small holes 20 on the front and back sides.

Here, the flat plate member 18 is an adhesive tape, and the corrugated member 19 is a polypropylene nonwoven fabric (trade name: Nishintex EL, Mitsui Petrochemical Chemical Co., Ltd. Kogyo Co., Ltd.) was heat-sealed and then bent into a corrugated shape. 21 is a plastic insulating cover that covers the edge of the charged filter 17. 22 is an auxiliary frame, 23 is a wire mesh-like positive electrode held by this auxiliary frame 22, and 24 is an electrode terminal of this positive electrode 22. This positive electrode 23 consists of a large number of rod-shaped stainless steel rods (3 plates in diameter) 25 arranged laterally.
A large number of stainless steel rods (diameter 3M) 26 are vertically arranged on the top, and after spot welding the intersections 27 of both, with the upper left and upper right contacts 28 masked, insulating material 29 (product name: Shrimp) is placed on the top. It is coated with Foam F-215 (Somar Co., Ltd.).

A negative electrode 14 and a deodorizing filter 1 are attached to the main frame 12.
6, charged filter 20, insulating cover 21, positive electrode 2
3 are stacked one on top of the other, 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 together.

By the combination of both frames 22 and 12, the deodorizing filter 1
6 and the charged filter 17 are sandwiched between the picture electrodes 14 and 23 in a sandwich-like manner. At this time, the upper left and upper right contacts 28 (portions not covered with the insulating material 29) of the positive electrode 23 come into contact with the electrode terminals 24 of the auxiliary frame 22, and
An end 30 of this positive electrode 23 is placed against the insulating cover 21 . The reason why the insulating cover 21 is provided in this way is as follows. In other words, even if the positive electrode 23 is covered with the insulating material 29, it is difficult to completely cover the end 30 of the electrode, and this end 30 may not be covered with the insulating material 29j (stainless steel may be exposed). . This is because the end portion 30 (stainless steel) has a square shape as shown in FIG. 51 may not be covered with the insulating material 29, or even if it is covered, its thickness may be thin.

Covering such an end portion 30 with an insulating cover 21,
This is because the insulation of the positive electrode 23 is maintained for the time being. Therefore, the corner portion 31 that corresponds to the contact point 28 of the positive electrode 23 is made to have a large thickness of the cover 21.

In FIG. 3, 32 is a rectifier high voltage device, and the picture electrode terminal 1
5.24 and a voltage of several KV is applied. As a result, an electric field is formed between the picture electrodes 14 and 23, allowing dust in the air between the two electrodes to be charged, and making it easier for this dust to adhere to the charged filter 17.

When such an air filter 8 is installed in the indoor unit 1, the indoor air relative to the air filter 8 is as shown by the solid line arrow (
(See Figure 1).

Therefore, indoor air flows through the holes 20 of the charged filter 17. At this time, small dust particles in the indoor air adhere to the inner wall of the hole 20. The air from which small dust particles have been removed flows out from the holes 20 of the charged filter 17, the odor is collected by the deodorizing filter 16, and then heated or cooled by the indoor heat exchanger 4 and blown out from the discharge port 10. Here, even if the indoor humidity is high or dust containing moisture enters the indoor unit 1 and this dust adheres to the charged filter 17, the positive electrode 23 is covered with the insulating material 29 and the insulating cover 21. Therefore, there is no fear that electricity will flow from this positive electrode 23, thereby suppressing a decrease in the magnetic force around the charged filter 17, and making it easier for dust to adhere to the charged filter 17.

Further, even if the front cover 3 (see FIG. 4) of the indoor unit 1 is moved and the positive electrode 23 is touched, there is no risk of electric shock.

In the air filter 8 having such a structure, the granular activated carbon fixed to the reticulated urethane foam of the deodorizing filter 16 has conductivity, so when the granular activated carbon comes into contact with the negative electrode 14, this granular activated carbon also acts as a negative electrode. As a result, a voltage of several kilovolts is applied across the charged filter 17. Note that this negative electrode 14 may be provided between the deodorizing filter 16 and the charged filter 17.

(G) Effects of the Invention As described above, in the present invention, the ends of the electrodes covered with the insulating material are covered with the insulating cover, so even if the ends of the electrodes are not completely covered with the insulating material. This insulating cover maintains the insulation of the electrodes, prevents a decrease in the magnetic force around the filter element, and prevents dust from easily adhering to the filter element.

[Brief explanation of the drawing]

The 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 the end of the electrode of this air filter, and FIG. 3 is a perspective view of this air filter. FIG. 4 is a sectional view of an indoor unit of a separate air conditioner incorporating this air filter. 8... Air filter, 14.23... Electrode,
17... Charged filter (filter element), 1
...Insulating cover 29...Insulating material.

Claims (1)

[Claims] 1) An air filter including an electrode for forming an electric field around a filter element, characterized in that the electrode is coated with an insulating material, and an insulating cover is placed at the end of the electrode. .