JPS625030A - Ventilation unit - Google Patents

Abstract

PURPOSE:To save labor of cleaning the ventilation unit due to oil stains at a reduced power consumed by carrying out ventilation through a filter provided with a catalyst which decomposes a heating element and oil on a metallic base plate having an opening covered with an insulating layer. CONSTITUTION:A shutter 26 which is freely opened or closed is provided front ardly of a filter 25 and a vane 23 rotated by a motor 22 rearwardly thereof. A shutter 32 which is freely opened or closed is provided further rearwardly of the filter 25. By rotating the vane 23 air is sent in a direction indicated by an arrow. In the filter 25, an insulating layer 28 is formed on a base plate 27 which has been subjected to a punching operation by use of a steel plate for enamelling use, so as to wrap a heating element 29, and a catalyst 30 which decomposes oil is coated on as an airstream opposing surface in opposite to the heating element 29. By this organization, soots within the exhaust air are trapped and the heating element is heated for a predetermined period of time to decompose oil, and oil is discharged out of the rear shutter 32. Accordingly, labor of cleaning the ventilation fan can be saved with a reduced power consumed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a ventilation system for exhausting smoke from cooking oil to the outside.

BACKGROUND OF THE INVENTION Ventilation systems that prevent indoor air from becoming contaminated by discharging oily smoke generated during cooking in the kitchen generally become heavily soiled due to oily smoke adhering to them, and must be cleaned frequently. In order to save this cleaning effort, as shown in FIG. 6, a filter 1 with a catalyst added and a heater 2 for heating the filter 1 are placed in a filter frame 3, and this is attached to the front of the ventilation fan body 4. A method has been proposed in which after oil smoke is captured by the filter 1, the front shutter 6 is closed and the heater 2 is heated to decompose the oil and prevent the blades 6 and the like from getting dirty. In addition, 7 in the figure shows a motor, 8 shows a support member, and 9 shows a rear shutter. (For example,
No. 9-224444) Problems to be Solved by the Invention In the conventional ventilation fan described above, in addition to the filter 1, in order to reduce the pressure loss due to the heater 2 as much as possible, a heating wire whose surface is not coated must be used as the heater. However, there was a possibility that the heater would corrode due to contaminants such as oil smoke. Furthermore, since air existed between the filter 1 and the heater 2, heat transfer was poor, and it took time to raise the catalyst's temperature.

The present invention takes into account the above-mentioned conventional problems, prevents an increase in pressure loss between the filter and the heater, improves heat transfer from the heater, reliably decomposes oil in a short time, and saves the effort of cleaning. The objective is to provide a ventilation system that removes dirt and reduces dirt.

Means for Solving the Problem In order to solve this problem, the present invention has a filter in which a heating element and a catalyst for decomposing oil are mounted on a metal substrate having openings covered with an insulating layer. This is what I did.

Function: With this configuration, the oily smoke generated during cooking is captured by the filter, heated by energizing the heating element, decomposed by the action of the catalyst, and discharged as gas.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 to 4. In the figure, 21 is the ventilation fan main body, and the motor 22
and a blade 23 rotated by the motor 22. A filter 26 held by a filter frame 24 is disposed in front of the blade 23, and a front shutter 26 whose upper portion is pivoted to open and close the surface of the filter 25 is disposed in front of the filter 25. It is being

The filter 25 has an insulating layer 28 formed on a substrate 27 punched using a crawler steel plate,
A catalyst 3o that encloses the heating element 29 and decomposes oil is attached to a surface opposite to the heating element 29 and facing the air flow. Insulating layer 2
8, after enameling the substrate 27, placing the heating element 29 in a predetermined position, and performing the enameling treatment again to insulate the substrate 27 and to prevent the heating element 29 from entering the air. Make sure to prevent exposure. Appropriate materials, plate thicknesses, and widths are selected to obtain a resistance value that allows the required temperature to be obtained for the two heating elements. The power cord 31 (
(Only one side is shown in FIG. 3), so that the current flows in a meandering manner. Two filters 26 are used to increase the efficiency of collecting oil smoke.
The opening portions are arranged so as to be alternately different. In addition, 32 in the figure is a rear shutter, and 33 is a support member.

The operation of the ventilation fan having the above configuration will be explained below. The motor 22 is started by a pull string or remote control, and the blade 23
Then start exhausting. At this time, the front shutter 26 and rear shutter 32 are also opened electrically or manually. In this state, air containing pollutants generated during cooking is discharged outside to keep indoor air clean. The main body of the exhaust fan is prevented from becoming dirty. When the necessary exhaust is finished, the front shutter 26 is closed, and
energizing the heating element 29 that constitutes the filter 26;
A catalyst 30 for decomposing oil is heated to 200-400°C. Due to this heating, the oil trapped in the catalyst 3o is decomposed,
The waste gas becomes waste gas and is discharged to the outside through the open rear shutter 32.

Also, a timer (not shown) is heated when electricity starts to be applied to the heating element 29, and when the time required for oil decomposition to finish (usually several minutes) has elapsed, the timer is deenergized and the electricity is stopped. do. At the same time, the rear shutter 32 is also closed. In this way, contaminants such as oil smoke are captured and decomposed by the filter 26, so dirt on the ventilation fan body such as the motor 221 and the blades 23 is greatly reduced, and cleaning is almost unnecessary. In addition, an insulating layer 28 is provided on the substrate 27 of the filter.
Since the heating element 29 and the catalyst 30 are integrally attached via the heating element 29, the heat from the heating element 29 is very easily transmitted to the catalyst 30, and a product with excellent thermal efficiency and strong strength can be obtained.

In this embodiment, a rectangular hole is shown as the opening shape of the substrate, but a round hole or a long hole may be used. The heating element and the catalyst may be arranged on the same plane with respect to the substrate. Inorganic heat-resistant paint is also used as the material for the insulating layer.

A ceramic coating agent may be used, and the catalyst may be directly deposited on the substrate without an insulating layer. The present invention can also be applied to range hoods other than ventilation fans.

Effects of the Invention As is clear from the description of the embodiments above, the present invention uses a ventilation system in which pollutants such as oil smoke contained in exhaust gas are captured by a filter, and then heated by a heater to be decomposed and discharged after the exhaust is finished. Since the heating element and catalyst are integrated on a metal substrate with holes as a filter via an insulating layer, it is strong and has excellent thermal efficiency, and of course, the dirt on the ventilation system is greatly reduced. This has the effect of eliminating the hassle of cleaning.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a ventilation fan according to an embodiment of the present invention;
Figure 2 is a perspective view showing the exhaust state of the ventilation fan, Figure 3 is an overview of the filter of the ventilation fan, Figure 4 is a sectional view of the filter of the ventilation fan, and Figure 5 is a sectional view of a conventional ventilation fan. be. 25...Filter, 27...Metal substrate, 28...Insulating layer, 29...Heating element, 30...Catalyst. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 29-74 Luther

Claims (1)

[Claims] A ventilation system having a filter equipped with a heating element and a catalyst for decomposing oil on a metal substrate with openings covered with an insulating layer.