JP2006075318A - Dust collector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a worker from being exposed to odor during work operation generating odor. <P>SOLUTION: The air flow to a worker can be operated in push-pull configuration with a combination of performances of an air blower 3, a reflux flow board 4, a dust collector blower 12, an exhaust damper 5 and the like, and the air, which is once passed through a deodorant filter 11, is refluxed near the dust collector, and passed through the deodorant filter 11 again to make it difficult for the untreated odor component to go to the worker. The deodorant performance is improved by repeating of this reflux with the same size of the filter. It is effective especially for the case of photocatalytic filter which decomposes the odor and has self-regenerating function. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a work environment at a production site, a medical site, a nursing site, a breeding site, or the like, or deodorization and dust collection in a smoking area.

  In recent years, stinking workplaces are increasing due to an increase in recycling sites and nursing care facilities. Deodorizing measures have become important for securing workers in adverse environments. When working with a bad odor due to work, the worker usually has a deodorizing mask or an air purifier installed. For deodorization, a method is generally used in which a porous material typified by activated carbon is used and the deodorant component is adsorbed thereto.

Here, artificial zeolite and fibrous carbon have been put into practical use as alternatives to conventional granular activated carbon because of the life and price of the adsorbent. However, these also stop functioning when the odor is saturated. If it becomes saturated, it is discarded as industrial waste. Some can be reused by heat treatment after using the filter element. However, even in this case, it must be removed once and put in a furnace or the like to deodorize.

There is also a method of using a fragrance to relieve the bad odor relatively, but since it is not deodorizing, there is a limit to the effect if the original odor is strong, and even the normal case is overwhelmed by the odor of the fragrance.

Recently, photocatalytic methods that decompose odor molecules and make them odorless have come out. This method is a very effective technique because it partially breaks the odor molecule chain with strong energy and does not bromide. However, the biggest drawback is that processing takes time. For this purpose, there is an epoch-making method in which the photocatalyst proposed by Segawa is sintered into ceramic and the surface area is greatly increased in a three-dimensional expanse.
Patent Publication 11-335187

However, even in this case, the amount of decomposition in one pass is small, and there is a limit in use. In particular, when an intense odor comes in pulses, many of them pass.
Iwata et al. Devised various passing air speeds for various types of contaminated air, and the photocatalytic filter was diffused at the final stage to somehow break down the odor.
Here again, the problem is that there is a limit to the ability to deodorize, as it tries to deodorize in one pass.
Patent Publication 2001-246285

The general idea of recirculation is to return the purified exhaust to the original working point.
Patent Publication 10-151239

When an operator works under bad odor, there is an activated carbon filter to take the absolute amount of odor in order to prevent the worker from being exposed to bad odor or mist. I must. The same is necessary at smoking areas as well. On the other hand, a photocatalytic filter that breaks down a chain of odorous molecules is an extremely effective measure, but the processing speed is slow, and if it is momentarily exposed to a strong odor, it will pass through.

Also, in the case of an electric dust collector, when a mist of a certain amount or more arrives, the portion passes without being removed.

In short, dust collectors and air cleaners have a bad odor, mist, and limit to remove dust in one pass, and workers must work in a poor environment. Smokers smoke in the smoke. The problem is to develop a dust collector with a deodorizing function that can solve this problem and is inexpensive and compact.

When the air after passing through the filter has a bad odor exceeding a specified value, a reflux pipe 19 is provided to return the dust collector exhaust air to the dust collector intake air so that the air does not return to the worker with the bad smell. By making this reflux, the odorous air is repeated, passed through the filter and deodorized. In a sealed space, the blower 3 and the dust collector 1 create a push-pull flow, and the worker's respirator is positioned upstream or out of the main flow so that no odor is felt.

Even in a smoking area, the side stream of the cigarette flows in a circulating flow, and the smoke is exhausted from the smoker. This creates a clean environment by allowing contaminated air to pass through the filter and the decontamination device several times to return to the person after it has been cleaned.

According to the first aspect of the present invention, it is possible to filter odors and the like that could not be sufficiently filtered with one pass, without increasing the filter area or providing a large-scale decomposition device. According to the second aspect of the present invention, it is particularly effective for a photocatalytic filter that takes a long time to decompose and a filter that has a limited instantaneous processing capacity such as a filter using an electrostatic precipitator. According to the invention described in claim 3, by setting up the booth, the push-pull airflow works effectively, and it is possible to work without using the steady circulation flow without being exposed to bad odor for the operator. .

According to the invention described in claim 4, since the ratio of the circulation flow and the reflux can be easily set, more efficient deodorization can be performed. According to the fifth aspect of the present invention, when the odor sensor is used and deodorization is sufficient even in one pass, the exhaust gas is exhausted as it is, so that the dust collection efficiency can be increased. According to the sixth aspect of the present invention, the bad smell is effectively decomposed in the entire booth by applying a photocatalyst to a portion having a surface area such as a reflux plate, a reflux pipe, a booth wall, and the inside of a dust collector in a wind flow. Can do. According to the seventh aspect of the present invention, it is effective to use a natural deodorizing component fragrance such as phytoncide for temperature control by a cooler in the booth and various bad odors.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

Figure 1 shows an example where a reflux tube is built into a dust collector. The malodor is sucked from the air inlet 13 and passes through the filter 11 to be deodorized. The reflux is returned to the suction port 13 by the reflux pipe 19. At this time, the amount of circulating flow is determined by the exhaust adjustment plate 15. Specifically, it is adjusted by rotating the rotating plate 15b. Here, the rotating plate 15b has the same shape of the adjusting plate 15 as the fixed plate 15a. The opening degree can be adjusted from 0 to 50% by rotating the turntable. This can change the ratio of reflux to circulation. The absolute amount is determined by the capacity of the dust collector blower.

The above is the basic element, and the air volume adjustment can be easily changed by controlling the blower motor with an inverter. In addition, when the sensor 18b and the valve 18a are combined, when the odor is less than the specified value, the valve 18a is opened and exhausted to the outside air from the cleaning air discharge port 18, thereby increasing the intake capacity of the dust collector.

Fig. 2 shows a booth-like work space 2 surrounded by vinyl, in which a reflux plate 4 and a conventional dust collector are used, and the wind to the worker is also between the blower 3 (cooler in this case) and the dust collector. Push-pull flow is obtained in combination.

FIG. 3 illustrates the wind flow. The circulating flow flows to the worker who generates odors at a cooler and comfortable temperature. On the other hand, by the pulling action of the dust collector 1, a constant wind speed is obtained in a wide range as compared with the pulling wind of only the normally used dust collector. By constantly positioning the respirator upwind or out of the mainstream, the operator does not block off odorous air. The problem is the purification of odorous air. If there is a place and a budget, a large-scale malodor decomposition device may be provided exclusively. Here is how to purify at low cost in a certain space.

The circulating flow containing bad odor is sucked into the intake port 13 of the dust collector 1. The air is exhausted from the exhaust port 14 through the filter 11 through the blower 12. The air that has exited is divided into a reflux that immediately returns to the intake port 13 of the dust collector 1 and a circulating flow that flows to the blower 3 by the reflux plate 4.

FIG. 4 shows the inside of the dust collector. A deodorizing filter 11 is stored in addition to a filter 16 for dust removal. The deodorizing filter 11 here is composed of a photocatalyst 11b and activated carbon 11a. FIG. 5 shows the details. The photocatalyst breaks the chain of odor molecules on its surface, resulting in no bromination. Therefore, since adsorption like activated carbon does not saturate, it can theoretically be used permanently. However, a major drawback is that the treatment is that malodorous molecules come into contact with the photocatalyst, and it takes time. In other words, there is a limit to the processing when the filter passes through one pass, and considering the space efficiency, it is effective to pass the filter many times such as two passes and three passes.

FIG. 6 is a simulation of the effect of the reflux plate. (A) is the case where there is no reflux plate 4 and there is no reflux around the dust collector, most of the airflow returns to the blower 3 and passes through the work table and returns to the dust collector. ing. In this case, if the bad odor cannot be completely removed in one pass, the worker works under the circulation of the bad odor and works under the diffuse bad odor.

(B) is a case where the reflux plate 4 is operated 100%, and most of the airflow from the exhaust port 14 of the dust collector returns to the intake port 13 of the dust collector.
In this case, the flow of air from the malodor generating source tends to return to the blower without passing through the dust collector due to the flow of the blower, and it can be seen that the bad smell diffuses.

(C) is an intermediate state between (a) and (b), a part of the wind from the reflux plate 4 turns to the blower 3, and the circulating flow passes through the work table. The suction port 13 of the dust collector 1 is combined with the reflux from the reflux plate 4 and sucked. Since the bad odor passes through the filter several times due to this reflux, the deodorization frequency is increased, and cleaner air is sent to the circulating flow to the worker.

FIG. 7 shows actual measurement values of an actual deodorization booth. Here, a cooler is used as the blower 3 in a booth of 3 m * 4 m * 3 m. This is aimed not only at the working environment but also at reducing the malodorous molecular activity at lower temperatures and lowering the sensory sensitivity. The air volume of the dust collector is 0 to 77 cubic m / min when driven by an inverter, and the ratio of circulating flow and reflux can be 1:10 times or more even when the passing air speed near the worker is 1 m / min. . The control plate 4 uses a roll screen coated with a photocatalyst. The control wind speed of bad odor is considerably low at 0.1 m / min compared with general dust. Therefore, a wider ratio of the circulation flow and the reflux can be taken. Compared to increasing the surface area of a photocatalyst or the like, the present invention is more effective in terms of space efficiency and price.

8 and 9 show the effect of deodorization. As a standard sample of odor, place a plate filled with bottled kneaded garlic on the workbench, check the saturation of the odor meter, cover the garlic, and observe the decrease in the odor meter value. When the dust collector is operated and stopped by this method, the difference in the value drop is observed. FIG. 9 shows this result. In addition, some sensory tests were conducted in a state close to actual work. In this case as well, there was a significant difference in whether or not the dust collector was rotated. This is clearly considered to be the effect of the circulation flow as well as the return flow. The rise of odor does not touch the subject's respiratory system due to the push-pull circulation, and this seems to have a great influence on the sensory test results.

The present invention is also effective in capturing mist that passes through when the concentration is high when the separation capability is limited as in an electrostatic precipitator.
In order to make it more efficient, it is effective if the opening degree of the reflux plate can be changed by using the electric motor in accordance with the change in the air volume of the dust collector so that the ratio of the circulation flow and the reflux is continuously changed.
When deodorizing, the odor source also varies, and it depends on the person whether it is a good odor or a bad odor. It also depends on the concentration. Alcohol and mold are completely different. Therefore, it is effective to use a cooler as described above, or to use a mist or a volatile solid of a natural agent having a deodorizing effect called phytoncide.

Further, since the effect of the photocatalyst is to increase the contact area, it is very effective to apply it to the reflux plate, the reflux tube, the inner wall of the dust collector, the blower and the like.
The same function can be easily applied to smoking areas. That is, in FIG. 6, the cigarette smoking gas is exhausted into the circulation flow, and the side flow is also in a positional relationship on this flow.

Since wiping work in waste disposal is difficult to automate, it is inevitably manual work. According to the present invention, the work environment is greatly improved in consideration of the workability. This approach can be used to improve smoking rooms.

FIG. 10 shows an example. Smokers also want to smoke where they don't smoke. In addition, it can be used in many places such as food, medical care, elderly facilities, and breeding grounds.

Dust collector with reflux tube Deodorization system with a reflux plate in the booth The circulation and reflux are shown in the cross-sectional view of FIG. It is sectional drawing of the dust collector provided with the deodorizing function. It is sectional drawing of a deodorizing filter box. It is a simulation figure which shows the flow of the air on various conditions. The circulating flow in the Example and the wind speed of a recirculation | reflux are shown. Standard odor measurement layout An example of deodorizing effect Configuration diagram when applied to a smoking room

Explanation of symbols

1 Dust collector 11 Deodorizing filter 11a Activated carbon filter 11b Photocatalytic filter 12 Blower 13 Inlet 14 Outlet
15 Exhaust adjustment plate 15a Fixed adjustment plate 15b Rotation adjustment plate 16 Filter 16a Dust filter 16b Pre-filter
DESCRIPTION OF SYMBOLS 17 Dust removal apparatus 18 Purified air discharge port 18a Exhaust valve 18b Odor sensor 2 Work space 3 Blower 4 Reflux plate 5 Exhaust damper 6 Worktable

Claims (7)

A dust collector provided with a reflux pipe or a reflux plate for recirculating exhaust gas discharged from a dust collector exhaust port directly to a dust collector intake port, in or around the dust collector. The dust collector according to claim 1, having a photocatalytic filter function or an electric dust collection filter function. The dust collector according to claim 1 or 2, wherein a stationary push-pull circulation flow is created in the space by combining the exhaust flow of the blower in a space sealed with a shielding cloth such as vinyl, a reflux plate, and flooring. . The dust collector according to any one of claims 1 to 3, wherein the circulating flow maintains a constant control wind speed and has a function of changing a ratio between the reflux and the circulating flow. 2. A mechanism having a mechanism for generating a reflux when a signal from an odor sensor installed in an exhaust flow after discharging a filter exceeds a threshold value or generating a reflux, or a function for stopping a purified air exhaust port. Or the dust collector of Claim 4. 6. The dust collector according to claim 1, wherein a material carrying a photocatalyst is applied to any one of a reflux plate, a reflux pipe, a dust collector inner wall, a blower blade, or a space constituting shielding material. The dust collector according to claim 3, wherein an air cooling device, a fog generator having a deodorizing function, and a volatile solid are provided in the airflow.