JPH0446186B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic filter device, and more particularly to an electrostatic filter device with a dust collection element formed of fibrous insulating material between charging screens.

Various improvements have been made to this type of device over the years, including the U.S. patent of Charles W. Willams.
There is a device disclosed in No. 2297601. This device consists of a fibrous material placed between charging screens. Devices based on similar principles are disclosed in US Pat.

However, the devices shown in the above patents all had major drawbacks. That is, when the fibrous material placed between the charging screens comes into contact with these screens and electrical contact is made, and if there is moisture on the surface of these fibers, an electric discharge is generated along these fibers, Current leaks from the power supply and also produces ozone, which is harmful to health. Also,
The attachment mechanism of the filter was complicated, and it was troublesome to attach and detach it. Due to these defects, there were few products that could be put to practical use.

The present invention has been made based on the above circumstances, and its purpose is to insulate the screens to prevent discharge between them, thereby solving the conventional problems.

Another object of the present invention is to provide a filter device that is compact, easy to attach and detach, and has a built-in power source.

Further, the present invention provides a filter device that can be directly replaced with a furnace filter of a conventional heating device.

Another object of the present invention is to provide a filter device in which the fibrous filter element can be easily replaced when the collected dust becomes saturated.

Another object of the present invention is to provide a filter device equipped with a safety switch that automatically shorts out the high voltage when the screen is opened for maintenance, inspection, etc.

Furthermore, the present invention eliminates the need for high voltage wiring;
The object is to provide a filter device to which a power supply can be completely installed.

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 and 2 are outer screens. These screens are made from a conductive material such as aluminum. These screens are attached to hollow metal outer frames 3 and 4, respectively. These frames are pivotally connected to each other by hinges 5, 6 (see FIG. 2). Moreover, 7 is an inner screen, and the outer periphery of this screen is attached to the inner frame 8. Further, 9 and 10 are fibrous pads, which are made of, for example, glass fiber material and are arranged between the inner screen 7 and the outer screens 1 and 2 (the third
(see figure). Further, the frame 8 is composed of an inner frame portion 8a and an outer frame portion 8b made of metal. This outer frame portion 8b is made of an electrically insulating material (synthetic resin) such as nylon or polypropylene. The inner frame 8a supports the screen 7, and the outer frame 8b covers the inner frame 8a and the edges of the screen 7. The inner frame 8 is attached to the outer frame 4 by insulating hinges 11 and 12. These screens 1, 2, and 7 are coated with a thin insulating layer of silicone rubber, Teflon, acrylic paint, varnish, polyurethane, or the like. Further, 13 is a metal box containing a high voltage power supply. and,
The generated high voltage is supplied to the screen 7 through an insulated wire (not shown). Also, the ground of this power supply is the box 13 mentioned above that houses this power supply.
and screens 1, 2 via frames 3, 4
It is connected to the. This high voltage power supply 13 is connected to the electric wire 2
Power is supplied from a low voltage power supply 14 via 3. The power supply 14 is formed with a standard protrusion for connection to a standard power supply socket.

FIG. 3 shows a part of this filter device in detail. The frames 3 and 4 are formed from hollow members,
A groove 15 is formed. The edges of the screens 1 and 2 are press-fitted into the groove 15 together with the elastic string-like body 16, and the string-like body 16 allows the edges of the screens 1 and 2 to fit into the inner surface of the groove 15. The screens 1 and 2 are fixed by being pressed.

Also shown in FIGS. 4 and 5 is the operation of a shorting switch which disables the high voltage when the filter arrangement is opened. That is, 17 is a plunger, and this plunger is attached to one outer frame 4. Further, a hole 18 is formed in the other outer frame 3 in correspondence with this plunger. Further, 19 is a spring member, and one end of this spring member is attached to the inner surface of the frame 3. Furthermore, an insulating member 20 is attached to the inner surface of this frame 3. Further, a contact 21 is attached on top of this insulating member 20. This contact 21 is connected to the above-mentioned high voltage power supply 13 via an electric wire 22.

Next, the operation of this filter device will be explained. A low voltage current (6 to 15 volts) is supplied from the low voltage power supply 14 to the high voltage power supply 13 via the electric wire 23. Therefore, there is no need to wire high-voltage electric wires, making installation of this device easy and increasing safety. The high voltage current generated by this high voltage power supply 13 is supplied to the insulated inner screen 7. As a result, a strong electric field is formed between the inner screen 7 and the outer screens 1 and 2. The fibrous pads 9 and 10 placed between these screens are then polarized, forming a positive electrode and a negative electrode at both ends of each fiber. Particles in the air passing through the filter device are adsorbed by the poles, improving dust collection efficiency.
The dust collected on these fibrous pads becomes conductive when moistened, but since the above screen is coated with an insulating coating, the inner screen 7
This prevents current from flowing to the outer screens 1, 2 (creating an arc). Therefore, generation of ozone due to this discharge is prevented.

A short circuit switch is also provided to prevent electric shock when replacing these fibrous pads. And when this filter is opened,
Plunger 17 releases spring member 19,
This spring member contacts the contact point 21, and connects the high voltage electric wire 22 to the ground (frame) via this contact point 21.

[Brief explanation of the drawing]

1 is a perspective view of the filter device with the fibrous material and the inner screen open; FIG. 2 is a perspective view of the filter device; FIG. 3 is a section through a portion of the device; FIG. FIG. 5 shows the state of the shorting switch when the device is open, and FIG. 5 shows the state of the shorting switch when the device is closed. 1, 2... Outer screen, 3, 4... Outer frame, 7... Inner screen, 8... Inner frame, 9, 10... Fibrous pad, 13... High voltage power supply, 17... Plunger, 19 ... Spring member, 21 ... Contact.

Claims (1)

Claims: 1. An electrostatic air filter device in the form of an energized medium, comprising: first and second outer frames supporting outer conductive screens; and corresponding sides of said outer frames; hinges for pivotally connecting the parts to each other, the outer frame being pivotable from a parallel closed position to a closed position; and an inner frame supporting an inner conductive screen. , the inner frame being disposed between the outer frames; and an insulating hinge pivotally connecting the inner frame to either the first or second outer frame; a high voltage power supply mounted on either one of the first or second outer frames of the; and also connecting one pole of the high voltage power supply to the first and second outer conductive screens. connecting means; further comprising connecting means for connecting the other pole of said high voltage power supply to said inner conductive screen; further comprising first and second insulating fibrous filter pads, the insulating Insulating fibrous filter pads are disposed on either side of the inner conductive screen and between the inner conductive screen and the outer conductive screen; and an electrostatic filter device characterized in that the second outer frame is removable in the open position. 2. The electrostatic filter device according to claim 1, wherein the first and second outer conductive screens and the inner conductive screen are each coated with an insulating material. 3. The electrostatic filter device according to claim 1, wherein said first and second insulating fibrous filter pads are glass fiber pads. 4. The electrostatic filter device according to claim 1, wherein the inner frame includes an insulating cover that covers the outer surface of the inner frame. 5. The electrostatic filter device according to claim 1, wherein the high voltage power source is connected to a low voltage power source via an electric cable. 6. The electrostatic filter device according to claim 5, wherein the low voltage power source is provided with a protruding connector for directly connecting the low voltage power source to a power supply socket. 7. The electrostatic filter device according to claim 1, further comprising a switch that stops the high voltage power supply when the filter is opened. 8. The switch: comprises: a plunger attached to the first outer frame; and formed on the second outer frame;
Provided with a hole into which the plunger is fitted;
a spring element provided inside said second outer frame;
The element is attached to this frame, passes below the hole and fits into a connector, which is connected to the high voltage terminal of the high voltage power supply and is connected to the frame. when the outer frame is in a closed position, the plunger passes through the hole and urges the spring element out of engagement with the connector; Further, when the outer frame is in the open position, the reaction force of the spring element engages the connector and stops the high voltage power supply. 8. The electrostatic filter device according to item 7.