JPH0755213A - Kitchen ventilating fan - Google Patents

Abstract

PURPOSE:To improve a capture efficiency for a filter, keep performance of a ventilating fan, i.e., prevent an air amount from being reduced, and reduce any noise and improve an external appearance. CONSTITUTION:There are provided blades 1 driven by a motor, a frame provided such that line blades 1 are rotatable, and a honeycomb-shaped filter provided on a suction side, the filter comprising a material of 0.1-1.5mmAq pressure loss at 2m/s air velocity and of a 90-99% porosity and the filter sucking air by driving the blades 1 and the blade 1 located frontally of the frame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a filter for a kitchen ventilation fan.

[0002]

2. Description of the Related Art A conventional kitchen ventilation fan will be described.
A conventional ventilation fan for a kitchen removes indoor smoke, dust and dust floating in the air, and odors by rotating a blower blade by a motor to discharge the room to the outside. Nowadays, there is a growing interest in air purification, and there is a tendency to install a ventilation fan in each room. These ventilation fans differ in size and performance depending on the purpose and size of the room. For example, a ventilation fan for a bathroom has a structure that solves the problems caused by water droplets due to high humidity inside the room, and a ventilation fan for the living room has low noise and a thin design. A replaceable filter is provided to facilitate cleaning of the body frame.

Another reason for this is a method in which a film is formed from paint and the film is peeled off to remove the adhered oil droplets. However, this method requires a long period of time and therefore cannot be removed cleanly. In most cases, there are areas that cannot be completely removed. Although it is possible to apply it to the body frame and blades, it is impossible to apply it to the internal motor etc., and it stops when oil drops adhere to the motor etc. Currently, mainly replaceable filters are used. There is.

On the other hand, there is an example in which a honeycomb structure is used for a filter other than a ventilation fan. This is originally developed as a structural material and is formed from a base material having excellent strength.
Therefore, since the pressure loss of the honeycomb is too high, there is no example applied to the filter of the ventilation fan. Ventilation fans for kitchens are intended to discharge steam, smoke, and odors generated during cooking to the outside of the room, but when cooking foods containing oil or cooking with oil, considerable oil droplets are generated. , Since it floats in the air, these oil drops are also sucked at the same time when the ventilation fan is activated. If these oil droplets adhere to the blades or the body frame, the surface becomes sticky and dust or dirt is likely to be attached, or the oil oxidizes and solidifies over time, making it difficult to remove. Therefore, a replaceable filter is installed in front of the blades to collect the oil droplets and reduce the amount of oil droplets that reach the blades and the main body. Generally, 40 to 50% of the oil generation amount is removed. is there.

However, if a filter is provided in front of the blades, the pressure loss rises, which leads to a decrease in air volume and an increase in noise. Therefore, those filters having extremely low pressure loss are used. Generally, these filters use non-woven fabric of organic fiber, but have high porosity so as to suppress pressure loss. With porosity, other than the fibers and binder in the nonwoven fabric,
It is the proportion of space occupied. Therefore, fine oil droplets are not collected by the filter, and many adhere to the blades and the main body,
It is impossible to remove 100% of the generated oil droplets.
If oil drops adhere to the filter, the pressure loss increases, the air volume decreases and the noise increases, and the performance as a ventilation fan deteriorates.Therefore, the user regularly or when the filter feels dirty. Need to be replaced. Although the filter can be easily replaced by simply removing and attaching the filter frame to the main body, it is often difficult to replace it. The guideline for replacing the conventional filter is 3
Since it is as short as ~ 4 months and the frequency of replacement is high, long life is desired. Furthermore, when oil drops adhere to the filter and they aggregate to form large oil drops, a path is created due to the way the fibers are entangled, and oil drips on the filter and may drop below the ventilation fan. There was a problem that the microwave oven might get dirty and that it could get into the food being cooked.

[0006]

As described above, in the conventional kitchen ventilation fan, the collection efficiency of the filter is poor, and if the collection efficiency is increased, the pressure loss becomes high, and the appearance is deteriorated due to oil dripping. There were drawbacks such as dripping oil adhering to the surroundings, the filter had a short life and had to be replaced frequently, and the performance was degraded due to filter clogging.

Therefore, the object of the present invention is to eliminate the above-mentioned drawbacks, improve the collection efficiency, maintain the performance of the ventilation fan, that is, prevent the reduction of the air volume, reduce the noise, and improve the appearance. And

[0008]

In order to achieve the above object, in the present invention, a blade driven by a motor, a frame in which the blade is rotatably provided, the blade and the blade in front of the frame are provided. It sucks by driving, and it has a honeycomb shape on the suction side and the pressure loss is 0.1 when the wind speed is 2 m / s.
The filter is made of a material having 1.5 mmAq and a porosity of 90 to 99%.

[0009]

In this structure, the filter having the honeycomb structure can delay the liquid dripping start time and prolong the service life of the filter.

[0010]

Embodiments of the present invention will be described in detail with reference to FIGS. FIG. 1 is a perspective view of a filter and a main body of a kitchen ventilation fan according to a first embodiment of the present invention. 2 is an enlarged view of the kitchen ventilation fan filter of FIG. 1, and FIG. 3 is a side sectional view of the blades and the filter in the kitchen ventilation fan of the present invention.

As shown in the figure, the kitchen ventilation fan of the present invention is
The blade 1, the body frame 3, the filter 5, the filter frame 9, the honeycomb substrate 11, the cell inlet 13, and the cell outlet 15 are included. Further, 17 indicates a cell size, and 19
Indicates the filter thickness.

The filter 5a has a honeycomb structure in order to improve the collection efficiency, and the material of the honeycomb substrate 11 is preferably organic fiber rather than inorganic fiber in terms of cost and manufacturability. Among them, the non-woven fabric 7 in which optimum fibers are randomly entangled is used. Other organic fibers include polyester, polypropylene, polyclar,
Any material that can be made into fibers, such as nylon and acrylic, can be used, but the filter 5a in this embodiment will be described using the most suitable nonwoven fabric among the above organic fibers.

The honeycomb structure filter 5a using the non-woven honeycomb base material 11 is manufactured so that the non-woven fabric forming the honeycomb base material 11 has a low pressure loss and a high porosity.

Next, regarding the size of the filter 5, the blade 1
The size may be such that it completely covers the main frame 3 and the main body frame 3, but the same size is preferable in view of appearance and attachment and removal.

Next, a kitchen ventilation fan according to a second embodiment of the present invention will be described. FIG. 4 is a side sectional view of the blade 1 and the filter 5b of the kitchen ventilation fan according to the second embodiment of the present invention. As shown in the figure, in the second embodiment of the present invention, the cell inlet 13 and the cell outlet 15 of the filter 5b of the kitchen ventilation fan are displaced from each other, resulting in a honeycomb-shaped cell structure which is not parallel to the suction direction. ing.

With the above structure, the contact area of the oil droplets becomes larger than that of the horizontal filter 5a.
Furthermore, the collection efficiency can be improved and the life can be extended. Although this is considered to increase the pressure loss, the filter thickness 19 is set to 3 to 20 mm and the cell size 17 is set.
By setting 2 to 10 mm, the effect of pressure loss can be reduced.

The above contents will be described in detail with reference to the experimental results shown in FIG. -Data 1 to 4 Using a polyester non-woven fabric having different porosity and pressure loss at a wind speed of 2 m / s, the cell size 17 is 5 mm, the filter thickness 19 is 10 mm, and the cell inlet 13 and the cell outlet 15 of each cell are positioned in parallel. The honeycomb-structured filter 5a was prepared, attached to a kitchen ventilation fan, and the pressure loss was measured at a wind speed of 2 m / s. Further, 960 cc / H of water and 300 g / H of oil were sent to the evaporation dish heated to 350 ° C., and the oil solution that had flown into the air was collected by the filter 5a for 1 hour, and the efficiency was measured. The oil droplets were continuously collected until oil dripping continued.

As a result, the results of data 1 to 4 shown in FIG. 5 were obtained.・ Data 5 to 7 Using polyester nonwoven fabrics with different porosity and pressure loss at wind speed of 2 m / s, cell size 17 is 5 mm, filter thickness 19 is 10 mm, and cell inlet 13 of each cell is above cell outlet 15. The filter 5b using the positioned honeycomb substrate 11 is made and attached to the kitchen ventilation fan, and the wind speed is set to 2
The pressure loss was measured in m / s. Further, water 960 cc / H and oil 300 g / H were sent to the evaporation dish heated to 350 ° C., and the oil drops flying in the air were collected by the filter 5b for 1 hour,
The efficiency was measured. The oil droplets were continuously collected until oil dripping continued.

As a result, the results of data 5 to 7 shown in FIG. 5 were obtained.・ Comparison data: Porosity 99%, pressure loss at a wind speed of 2 m / s is 0.7 mm
A filter of Aq polyester non-woven fabric was attached to a ventilation fan, and the pressure loss was measured at a wind speed of 2 m / s. Also, 350
Water 960cc / H, oil 300g /
The liquid was sent by H, and the oil droplets flying in the air were collected by a filter for 1 hour, and the efficiency was measured. The oil droplets were continuously collected until oil dripping continued.

Based on the above results, the collection efficiency of each experimental result is shown as a relative value with the comparative data being 1.0. Experimental results 1 to 4 have a low pressure loss of the base material, a high porosity, and since the cells of the honeycomb base material 11 are horizontal to the blades 1, the pressure loss of the filter 5a is low and the collection efficiency is also low. Without doing so, the time for oil dripping can be delayed and the life can be extended.

Experiment result 5 is the result when the cells of the honeycomb substrate 11 are inclined with respect to the suction direction, and experiment results 6 to 7 are that the porosity is low or the pressure loss of the honeycomb substrate 11 is small. In addition to being high, the cell is inclined with respect to the suction direction, so that the pressure loss of the filter 5b itself is slightly increased, but the collection efficiency is increased. Although the oil dripping start time becomes shorter, the cell inlet 13 has a higher structure than the cell outlet 15 as can be seen from FIG. Since it flows to the 1 side, it is difficult to see the oil dripping from the front side.

Further, the oil flowing to the blade 1 side is provided at a lower portion of the filter frame 9 so as not to flow down to the lower portion of the kitchen ventilation fan. From the above experimental results, the filter 5 of the kitchen ventilation fan of the present invention has a filter thickness 19 of 3 to 20 mm and a cell size 17 of 2 to 10 mm.
Has become. In all cases, the optimum values were obtained in consideration of pressure loss and collection efficiency.

From the above optimum value, the pressure loss at a wind speed of 2 m / s was in the range of 0.1 to 1.5 mmAq and the porosity was in the range of 90 to 99%. In addition, in the present embodiment, the structure in which the cell inlet 13 of the cell of the honeycomb substrate 11 is higher than the cell outlet 15 is oblique to the traveling direction, but the third embodiment of the present invention in FIG. As shown in a side sectional view of a filter of a kitchen ventilation fan according to an example, by using a cell of a honeycomb substrate 11 having a V-shaped cross section, the collected liquid is stored in a V-shaped recess. You can An oil-absorbent resin for sucking oil droplets is used for the portion to be stored. In addition, it is acceptable if the pressure loss and the porosity are within the above ranges.

[0024]

As described above, according to the present invention, the filter has a honeycomb structure, so that the start time of oil dripping is delayed and the appearance is improved without increasing the pressure loss and reducing the collection efficiency. The effect can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a main body and a filter of a kitchen ventilation fan according to the present invention.

FIG. 2 is an enlarged view of the filter of the kitchen ventilation fan according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view of the filter according to the first embodiment of the present invention.

FIG. 4 is a sectional view of a filter according to a second embodiment of the present invention.

FIG. 5 is a diagram showing experimental results in each example of the present invention.

FIG. 6 is a sectional view of a filter according to a third embodiment of the present invention.

[Explanation of symbols]

1 ... Blade, 3 ..., Main body frame, 5 ... Filter, 9 ... Filter frame, 11 ... Honeycomb base material, 13 ... Cell inlet, 15 ... Cell outlet, 17 ... Cell size, 19 ... Filter thickness.

Claims (4)

[Claims] 1. A blade driven by a motor, a frame in which the blade is rotatably provided, and an opening side of the frame which is an air suction side by driving the blade and the blade in front of the frame. Honeycomb shape with a pressure loss of 0.1-1.5 mm at a wind speed of 2 m / s
A ventilation fan for a kitchen, comprising a filter made of a material having Aq and a porosity of 90 to 99%. 2. The ventilation fan for the kitchen according to claim 1, wherein the honeycomb filter is made of a non-woven fabric of organic fibers. 3. The ventilation fan for the kitchen according to claim 1, wherein the cell direction of the honeycomb filter has a downward shape from the ventilation space side to the blade side. 4. The ventilation fan for the kitchen according to claim 1, wherein a cross section of the filter in the cell direction has a V shape from the ventilation space side to the blade side.