JP6226383B2 - Air purification device - Google Patents

Description

  The present invention relates to an air purifier that can easily check the replacement time of a filter that purifies air containing harmful substances such as formalin.

  In the anatomical practice of medical school and dentistry, formalin is injected to prevent decay and bacterial growth, and an autopsy specimen immersed in ethanol is dissected on the dissecting table. Since the dissection practice is carried out over a long period of time, when discontinuing the practice, spray the subject to be sprayed with ethanol for the purpose of sterilization and drying prevention, and then cover this with a cloth sprayed with ethanol and then the surrounding area. In order to prevent substances harmful to the human body such as formalin from diffusing, cover the autopsy specimen on the dissection table with a cover having a gas barrier property as described in Patent Document 1, and at the time of resuming the next anatomical training It keeps until.

  Then, when resuming the next anatomical training, the cover of the exhaust port provided in the cover and the outside air intake port is removed, and the exhaust port is connected to the air purifier with an exhaust hose so that After sucking the air in the cover containing formalin and ethanol, which is emitted from the cloth covering the air, into the air purifier, the air in the cover is replaced with clean outside air flowing in from the outside air intake, The training is resumed with the cover removed.

  The air sucked by the air purifier is removed and purified by a filter incorporated in the filter chamber of the air purifier, and then discharged into the anatomy chamber.

  At this time, ethanol having a large molecular weight is physically adsorbed by a filter using activated carbon as a filtering agent and filtered, but formalin having a low molecular weight is not captured by the filter and permeates, so permanganese. A filter using an oxidizing agent such as potassium acid as a filtering agent is provided behind the activated carbon filter, where formalin is oxidized and decomposed to detoxify.

  Filtering agents for filters that decompose and remove formalin gradually decrease its filtering capacity as oxidative decomposition of formalin. Therefore, before the concentration of formalin leaking into the room from the rear of the filter reaches a predetermined allowable level, the filter must be filtered. It needs to be replaced with a new one.

  On the other hand, in order to notify the filter replacement time, in the invention proposed in Patent Document 2, a plurality of filters are arranged back and forth in the air flow path of the air purifier, and the front filter and the rear filter are arranged. A dirt detection sensor for detecting dirt on the air that has passed through the front filter is provided in the gap so that a notification signal is generated when the dirt on the air that has passed through the front filter reaches a predetermined threshold.

Japanese Patent No. 4822470 JP 2011-72962 A

  However, in the invention described in Patent Document 2, the threshold value of dirt detected by the dirt detection sensor is estimated based on the allowable level of the concentration of harmful substances contained in the air released to the outside from the rear filter. Because the values are used, it was not possible to accurately grasp when filter replacement was actually required.

  For this reason, the contamination threshold is estimated to be lower than a value that actually requires filter replacement in consideration of safety, so that the filter may be replaced earlier than necessary.

  In addition, as a method for judging the replacement time of the filter, there is also a method of measuring the concentration of formalin contained in the air that has passed through the filter by inserting a detection tube enclosing a formalin reaction indicator into the air flow path behind the filter. However, this method cannot perform continuous measurement, and if ethanol is contained in the air to be measured, there is a problem that the reaction indicator reacts to this and the formalin concentration cannot be measured accurately. In addition, this measurement requires specialized knowledge and skill, and there is a problem that it is expensive.

  Therefore, the present invention solves the problems in the prior art as described above, and allows an unskilled person to easily and easily replace a filter filled with a filter agent that oxidizes and removes harmful substances such as formalin. An object of the present invention is to provide an air purification device capable of accurately judging.

The air purification device of the present invention provided for the purpose, in the filter chamber, a filter using a filtering agent to decompose and remove the oxidation of harmful substances at least one incorporated in, using said blowing means filters the external air introduced into the chamber, an air purification device which is adapted to purify by passing through the filter, wherein the filter, at least, of the side walls which are disposed inner wall surface facing the filter chamber A filter casing having a first transparent part in part, an oxidant filled therein and oxidizing and decomposing harmful substances contained in the air passing through the filter casing, and an oxidation product in the oxidant The filter medium is combined with a reaction indicator whose color changes as the flow rate increases, and the first transparent portion passes through at least a part of the filter chamber. The second transparent portion color reaction indicator in the filter medium in the filter casing can be observed from the outside of the filter chamber is provided near the position of the second transparent portion of the filter chamber outer surface, or the second In the transparent part of the filter, as the oxidation product of harmful substances increases, the boundary position of the discoloration region of the reaction indicator that proceeds in the air flow direction in the filter agent has reached a position that requires filter replacement. It is characterized in that a display portion is provided on which an index for informing is provided .

  According to the air purifying apparatus according to the first aspect of the present invention, the deterioration degree of the filtering agent that decomposes and removes harmful substances such as formalin in the filter by oxidation can be visually confirmed from the outside as needed. Therefore, it is not necessary to provide a formalin detection sensor, a notification device or the like for notifying the filter replacement time in the air purification device.

  Further, in the present invention, the filter replacement time can be known without using a formalin detection sensor or the like, so there is no risk of losing the filter replacement time due to a failure of the formalin detection sensor or the like, and high reliability and safety. Can be secured.

  In addition, even an unskilled person who is difficult to judge the replacement time of a filter simply by looking at the discoloration status of the reaction indicator contained in the filter medium, etc., can determine the filter replacement time by referring to the indicator on the display. It can be accurately grasped.

It is a side view which shows the state which connected the air purification apparatus of this invention to the to-be-analyzed specimen cover of the dissecting stand. It is a longitudinal cross-sectional view of the filter chamber provided in the air purification apparatus of this invention. It is a horizontal sectional view of the filter chamber provided in the air purification apparatus of the present invention. It is a cross-sectional view of the filter chamber which shows the AA cross section of FIG. It is a perspective view of the filter for formalin removal used for the air purification apparatus of this invention. It is a horizontal sectional view of the transparent part vicinity of the filter for formalin removal used for the air purification apparatus of this invention. It is a front view of the lid which has a transparent part provided in the air purification apparatus of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a state in which the air purification apparatus of the present invention is connected to an autopsy specimen cover of an autopsy table. The air purification apparatus 1 shown in FIG. Used in the vicinity of

  On the dissection table A, an autopsy specimen B for dissection practice that has been processed using formalin and ethanol is placed between the end of the previous dissection practice and the start of the next dissection practice. ing. During this time, in order to prevent formalin and high-concentration ethanol that are harmful to the human body from flowing and diffusing into the anatomy training room from the dissected specimen B where dissection has been interrupted, the autopsy specimen B has a flexible gas barrier property. A clear specimen cover C made of a transparent resin sheet is covered.

  When resuming anatomical training, before removing the specimen cover C from the dissection table A, an exhaust port provided on one end surface of the specimen cover C and normally sealed with a lid is provided. The lid is removed and the exhaust hose D is connected to the air purification device 1.

  The opposite end face of the specimen cover C is provided with an outside air intake port which is not shown in the figure but is normally sealed with a lid. When the exhaust hose D is connected to the exhaust port, In addition, the lid is removed to allow the outside air to flow into the specimen cover C from the outside air intake port.

  In this state, the air purifying means built in the air purifying apparatus 1 is operated so that air containing harmful substances filled inside the specimen cover C is exhausted through the exhaust hose D to the air purifying apparatus 1. Aspirate inside.

  When the air containing formalin and ethanol taken into the air purifying apparatus 1 passes through a filter incorporated therein, these harmful substances are removed, and the purified air is released into the anatomy training room. The

  Thus, the air in the specimen cover C is replaced with clean external air that has flowed from the outside air intake port. After the air in the doubled specimen cover C is completely replaced, the dead specimen cover C is removed and the training is resumed.

  In the present embodiment, the air purification device 1 has a structure that can be moved to a desired position on the floor E of the anatomical training room by a plurality of caster wheels 3 provided at the bottom of the machine casing 2. The outside of the machine casing 2 is covered with a stainless steel panel, and the panel is provided with operation switches, an internal inspection lid, and the like. Although not shown, a blower is mounted inside the machine casing 2 as a blowing means.

  A filter chamber 4 is provided on the machine casing 2. 2 is a vertical cross-sectional view of the filter chamber 4, FIG. 3 is a horizontal cross-sectional view thereof, and FIG. 4 is a cross-sectional view showing the AA cross-section of FIG. 2, as shown in FIG. Is manufactured in a box shape, and an intake port 5 connected to the exhaust hose D is provided on the front end face. Although not shown, an outlet communicating with the blower in the machine frame 2 is provided on the lower surface of the rear end side of the filter chamber 4.

  Inside the filter chamber 4 is formed an air flow path from the inlet 5 to the outlet, and four activated carbon filters 6 of the same specification are adjacent to each other in the front stage in the air flow path. Further, four formalin removal filters 7 having the same specification are arranged adjacent to each other in the subsequent stage.

  Each of the activated carbon filter 6 and the formalin removing filter 7 has filter casings 8 and 9 whose outer dimensions are unified to the same size and whose surroundings are rectangular frames, and the inside of the filter casing 8 of the activated carbon filter 6. Is filled with activated carbon as a filtering agent.

  The casing 9 of the formalin removal filter 7 is filled with a filtering agent obtained by coating the surface of potassium permanganate particles with fine particles of a reaction indicator. As this reaction indicator, one that changes color when potassium permanganate in the filter agent reacts with formalin, oxidation products increase, and PH value changes is used.

  A filter holding member 10a that guides and supports the upper and lower surfaces of the filter casing 8 of the activated carbon filter 6 and the side surface on the back side on the inner upper surface and lower surface and the inner side surface of the filter chamber 4, respectively. As shown in FIG. 4, 10b and 10c are provided in a substantially U shape when viewed in the front-rear direction.

  As shown in FIGS. 3 and 4, a rectangular filter replacement opening 11 is formed on the front side wall of the filter chamber 4 for taking in and out the activated carbon filter 6 during replacement.

  The filter replacement opening 11 is normally sealed with a lid 13 that can be removed by an opening / closing handle 12. As shown in FIGS. 2 and 3, the filter chamber 4 has a front-rear direction on the inner side of the filter chamber 4 with the front end face abutting against the rear end faces of the filter holding members 10 a, 10 b, 10 c. A filter positioning member 14 having a rectangular frame shape as viewed from above is fixed.

  The filter positioning member 14 is configured so that the rear end surface of the filter casing 8 of the last row of the four activated carbon filters 6 held by the filter holding members 10 a, 10 b, and 10 c in the filter chamber 4 extends in the front-rear direction of the filter chamber 4. Is positioned at a predetermined position.

  Further, a band-shaped seal member S made of a rubber material is attached to the peripheral edge of the rear end surface of the filter casing 8 of each activated carbon filter 6, and the filter casings of these activated carbon filters 6 are mutually connected. 8 and the filter casing 8 and the filter positioning member 14 of the last activated carbon filter 6 are sealed.

  Although not shown, inside the filter chamber 4, the front end surfaces of the filter casings 8 at the front ends of the four activated carbon filters 6 are pressed rearward so that these activated carbon filters 6 are moved to the filter positioning member. 14 is provided with a cam that is sandwiched between the cam 14 and fixed.

  When replacing the activated carbon filter 6, the cam mechanism turns the operation handle (not shown) disposed outside the filter chamber 4 to release the pressure on the filter casing 8, thereby opening the filter replacement opening 11. The used activated carbon filter 6 can be taken out from and replaced with a new one.

  The four formalin removal filters 7 in the rear stage are provided with substantially U-shaped filter holding members 15a, 15b as viewed in the front-rear direction of the filter chamber 4, similarly to the filter holding members 10a, 10b, 10c described above. 15c, and the filter casing 9 of the formalin removing filter 7 at the end of the column is positioned by the filter positioning member 16.

  Although not shown here, the front end face of the filter casing 9 at the front end of the row of these formalin removal filters 7 is located behind the filter chamber 4 in the same manner as the activated carbon filter 6 described above. The formalin removing filter 7 is sandwiched between the filter positioning member 16 and fixed, and a cam mechanism is provided which can release the pressure by rotating an external operation handle when replacing the filter.

  In addition, a rectangular filter replacement opening 17 is formed on the front side wall of the filter chamber 4 behind the filter replacement opening 11 so that the formalin removal filter 7 can be taken in and out during replacement. .

  The filter replacement opening 17 is normally sealed with a lid 19 that can be removed by an opening / closing handle 18 in the same manner as the filter replacement opening 11 described above. The lid body 19 is opposed to the respective transparent portions 9A (first transparent portions) provided on the respective side surfaces of the front side of the filter casing 9 of the four formalin removing filters 7 disposed on the lid body 19. As described above, a transparent portion 19A (second transparent portion) made of a transparent acrylic resin plate is provided.

  As shown in FIG. 5, the transparent portion 9 </ b> A is configured by mounting a transparent acrylic resin plate 9 </ b> C on a rectangular opening 9 </ b> B opened on the side surface of the filter casing 9 on the front side in the figure. In addition, the upper surface of the filter casing 9 is formed with a filling port 9E which is closed by a screw-fixed lid plate 9D, from which the filter medium F can be filled or refilled.

  As described above, the filter agent F is obtained by coating the surface of potassium permanganate particles with fine particles of a reaction indicator, and the color of the reaction indicator on the surface of the filter agent F from the outside of the filter casing 9 through the transparent portion 9A. It is possible to observe changes in

  Further, a stainless porous plate 9 </ b> F for allowing air to pass through the filter medium F is attached to the center portions of the front and rear surfaces of the filter casing 9. In addition, a seal member S similar to that used in the above-described activated carbon filter 6 is attached to the peripheral portion of the rear surface over the entire periphery.

  FIG. 6 is a horizontal partial sectional view in the vicinity of the transparent portion 9A. As shown in FIG. 6, a seal is provided between the peripheral portion of the acrylic resin plate 9C and the back surface of the peripheral portion of the opening 9B of the filter casing 9. A member 9G is incorporated, and the seal member 9G prevents air passing through the filter casing 9 from leaking from the periphery of the acrylic plate 9C to the outside. The acrylic plate 9C is fixed to the opening 9E from the inside of the filter casing 9 by a fixing material 9H.

  As shown in FIG. 7, from the transparent part 19A on the outer side of the lid 19, the state of the filtering agent in these filters 7 is observed through the transparent part 9A of each formalin removing filter 7 arranged on the inner side. be able to.

  In the figure, the hatched portion visible from each transparent portion 9A indicates a region where the filtering agent is still effective, and the white portion to the left of the boundary position X is a region where the filtering agent deteriorates and is invalid. Is shown.

  In the invalid region, the filter medium is discolored by the reaction indicator contained in the filter medium, and the boundary position X is located on the right side of the drawing (downstream of the air flow path) as the filter medium of the filter 7 deteriorates. Go to.

  Further, the space above the transparent portion 19A outside the lid 19 is used as a display portion 20 that notifies whether or not the position where the filter needs to be replaced has been reached. In FIG. 7, the display unit 20 has indices of ranges of “safety”, “required replacement”, and “dangerous” corresponding to the changing range of the boundary position X of the color changing gamut, When the boundary position X falls within the range of “requires replacement”, it indicates that it is time to replace the filter.

Further, in the present embodiment, the display unit 20 displays both standard color samples when the filtering agent is effective and when the filtering agent has become invalid due to deterioration. Even an expert can accurately determine the color change state when the filter medium is deteriorated.
Here, the display unit 20 is provided in the space above the transparent part 19A of the lid 19, but may be provided in the transparent part 19A.

  In this embodiment, since the high-concentration ethanol is contained together with formalin in the air taken into the air purification device 1, the activated carbon filter 6 is disposed upstream of the formalin removal filter 7 in the air flow path in the filter chamber 4. The ethanol is adsorbed and removed so that the potassium permanganate contained in the filtering agent F of the formalin removal filter 7 does not react with ethanol to impair the decomposition ability of formalin.

  However, when ethanol is not generated as in the case of performing pathological examination of tissue and only formalin needs to be removed by an air purifier, it is not necessary to provide an activated carbon filter in front of the air flow path of the filter chamber. Only the filter for removing formalin may be incorporated in the filter chamber.

  Further, the shape of the filter chamber and the filter incorporated therein is not limited to the above-described embodiment. For example, the filter chamber is formed in a vertical cylindrical shape to form a vertical air flow path inside the filter chamber. In addition, the filter casing may be formed in a vertically flat columnar shape that conforms to the filter casing.

  Further, in the above-described embodiment, the transparent portion 9A is provided on one side surface of the filter casing 9 to serve as the first transparent portion, and the lid body 19 attached to the filter replacement opening 17 of the filter chamber 4 is used. The transparent portion 19A is the second transparent portion, but these transparent portions are not limited to those of the present embodiment, and the two transparent portions pass through the two transparent portions from the outside of the filter chamber in the filter medium in the filter casing. It is only necessary that the color of the reaction indicator can be observed.

  Accordingly, the entire filter casing may be made of a transparent material and this may be used as the first transparent portion. Similarly, the entire filter chamber may be made of a transparent material and used as the second transparent portion. .

  In addition, the transparent material used for the first transparent portion and the second transparent portion is not limited to the acrylic resin plate, but is a highly transparent material having a necessary strength such as another resin plate or tempered glass. I just need it.

  Further, in this embodiment, the filtering agent F used is a potassium permanganate particle surface coated with fine particles of a reaction indicator, but the filtering agent is not limited to this, and formalin is oxidized. Other oxidizing agents that can be decomposed, such as manganese dioxide, may be used.

  In addition, when manganese dioxide is used, if the surface of the particles is coated with reaction indicator fine particles, the oxidation reaction of formalin will be suppressed. Therefore, a layer of manganese dioxide and a reaction indicator layer are alternately stacked. It is desirable to fill the casing.

  The air purification apparatus of the present invention can be used in various environments where formalin is handled, such as medical universities, research institutions, and hospitals. Furthermore, the air purifying apparatus of the present invention can be used also when purifying air containing a substance that is decomposed by an oxidizing agent contained in a filtering agent and discolors a reaction indicator by the oxidation product, similarly to formalin. .

DESCRIPTION OF SYMBOLS 1 Air purification apparatus 2 Machine frame 3 Caster wheel 4 Filter chamber 5 Intake port 6 Activated carbon filter 7 Formalin removal filter (filter)
8, 9 Filter casing 9A Transparent part (first transparent part)
9B Opening 9C Acrylic resin plate 9D Lid plate 9E Filling port 9F Porous plate 9G Sealing member 9H Fixing material 10a, 10b, 10c Filter holding member 11 Filter replacement opening 12 Opening / closing handle 13 Lid 14 Filter positioning member 15a, 15b, 15c Filter holding member 16 Filter positioning member 17 Filter replacement opening 18 Opening / closing handle 19 Lid 19A Transparent portion (second transparent portion)
20 Display part S Seal member F Filter agent

Claims (1)

Filter chamber within hazardous substance filter using a filtering agent to decompose and remove by oxidizing at least one built in, the external air introduced into the filter chamber inside with blowing means, is passed through the filter An air purification device that purifies
The filter includes at least a filter housing having a first transparent portion in a part of the side wall is disposed opposite the inner wall surface of the filter chamber, filled therein, the air passing through the filter housing Consists of a filtering agent that combines an oxidizing agent that oxidizes and decomposes harmful substances contained therein and a reaction indicator that changes color with an increase in oxidation products in the oxidizing agent,
At least a part of the filter chamber is provided with a second transparent part capable of observing the color of the reaction indicator in the filter medium in the filter casing from the outside of the filter chamber through the first transparent part,
In the vicinity of the second transparent portion on the outer surface of the filter chamber, or in the second transparent portion, a reaction indicator that progresses in the air flow direction in the filter medium as the oxidation product of harmful substances increases. An air purifying apparatus comprising: a display portion on which an indicator for notifying whether or not the boundary position of the discoloration region has reached a position where filter replacement is necessary is provided .

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