JP4718317B2 - High performance air shower - Google Patents

Description

The present invention relates to an air shower device installed at an entrance / exit of a clean room, which is a restricted area where contamination control (cleanliness management) is performed, and more specifically, has a function of removing various suspended microorganisms in addition to suspended particulates. The present invention relates to a highly functional air shower device.

R & D / manufacturing processes for precision optical equipment, LSI, ULSI and other semiconductor circuit elements, liquid crystal and other precision electronic components, biotechnology-related, food processing / manufacturing processes, and research / development / manufacturing facilities for pharmaceuticals, etc. A clean room where cleanliness management (contamination control) is performed is indispensable. Clean rooms include industrial clean rooms where the amount of suspended particulates is mainly controlled in facilities such as research, development and manufacturing of industrial products, and suspended microorganisms such as fungi and fungi in the air as well as suspended particulates in the field of biotechnology. There is a biological clean room with a controlled amount. In addition, the cleanliness regarding contamination control is classified into classes 1 to 9 according to the allowable particle diameter of suspended fine particles and the allowable particle concentration within 1 m ³ in ISO. In Japan, related terms are in Japanese Industrial Standard JISZ8122. The cleanliness class of the clean room is defined in JIS B9920.

In a clean room used in such various fields, particularly in a biological clean room, in addition to undesired suspended fine particles, suspended microorganisms must be reduced to a predetermined level or less. In addition to this type of suspended particulates, it is necessary not to generate suspended microorganisms in the clean room, but also when entering the clean room, human bodies such as limbs, face, head, clothing (dust-proof clothing) or It must be surely prevented from being brought in from the outside due to the parts, materials and materials that are brought in. For this reason, an air shower device for removing dust adhering to the human body of the passing person, dust-proof clothing and other clothes and passing cargo by blowing off with a powerful air jet (jet air flow) is indispensable at the entrance of the clean room.

The air shower device is a closed space provided with a pair of doors controlled by an interlock so that it cannot be opened at the same time on the entrance side from the outside and the exit side in contact with the clean room at the entrance of the clean room. It is often formed as a structure that sucks an air flow containing floating dust and the like while occupying an air jet against a resident. Furthermore, in biological clean rooms, removal of floating microorganisms such as various fungi and fungi that are carried along with the passing cargo of clothes, parts, materials, etc. of the residents is ensured in a short time. A highly functional air shower device equipped with an air cleaning means including a fungus or sterilizing function is indispensable.

As a prior art of an air cleaning means having a sterilizing function necessary for performing cleanliness management with a function of removing floating microorganisms, Patent Document 1 discloses an action of an ultraviolet lamp, an ultraviolet sterilizer, and a photocatalytic substance. In addition, an air cleaner that removes bacteria and harmful gases in the air and cleans the air with an ozone generator and ozonolysis means is disclosed. Patent Document 2 discloses an air cleaning device that includes a coating of a photocatalytic substance such as titanium dioxide and can sterilize suspended microorganisms by irradiating ultraviolet rays from a built-in ultraviolet lamp.

Furthermore, patent document 3 is disclosing the air conditioning apparatus provided with the ion generator which generates a positive ion and a negative ion simultaneously. Patent Document 4 discloses an air cleaning system including a sterilizing filter, a deodorizing filter, and the like. Similarly, Patent Document 5 is equipped with a high-performance filter (HEPA filter) that removes fine dust contained in the intake air, fungi, fungi, moisture, and the like, and a photocatalytic filter for sterilization, and eliminates influenza virus and SARS virus. An air purification method and apparatus are disclosed.

As described above, there are various air cleaning means by using a sterilizing action such as ions and ozone, using a photocatalytic action, and further using a HEPA filter. However, there are various application environments, some of which are limited to local effects, while others are insufficient, and excellent in places such as unmanned facilities such as indoors, locker rooms, and warehouses over time. However, many of them have problems such as being unsatisfactory as a sterilizing effect for a short-time passing person such as an air shower device.

Furthermore, the air cleaning means required for the air shower device at the entrance of the clean room is that floating microorganisms such as fungi and fungi within a short period of time when the occupant and their belongings and other parts and materials pass through the air shower device. The ability to reliably sterilize species will be required. Therefore, the most important requirement is an air shower device including an air cleaning means that exhibits a strong sterilizing effect while being safe for the human body.
JP 2004-113621 A JP 2004-57773 A Japanese Patent Laid-Open No. 2004-606 JP 2004-251607 A JP-A-2005-648

The present invention provides a highly functional air shower apparatus that can eliminate suspended particulates and various suspended microorganisms, has an air cleaning function that is safe for the human body, and can be applied to a biological clean room. Is an issue.

According to the first aspect of the present invention, the first door installed on the outside of the access path to the clean room, the second door installed on the clean room side, the first door and the second door Released from a wall or ceiling, a pressurized air flow forming means 18 for generating an air jet effective for removing suspended particulates from the wall and the ceiling, and clothes or passing articles of a passing person. Exhaust suction means 20 for collecting the exhaust stream 19 containing the collected dust, and a high function (HEPA) that passes the exhaust air from the exhaust suction means when it is purified and circulated to the pressurized air flow forming means ) in the air shower apparatus comprising a filter 16, and a container 42 for accommodating the gel stabilized chlorine dioxide 44 disposed in a portion of the closed space, to gel stabilize chlorine dioxide within said vessel An ultraviolet irradiation apparatus 46 for irradiating ultraviolet rays, the sliding damper 48 for changing the opening area of the upper opening of the container as appropriate, provided with, for sterilizing floating microorganisms existing in the closed space A disinfecting gas generating means 40 that releases chlorine dioxide gas (ClO ₂ ), which is a disinfecting gas, while controlling it to be within a predetermined concentration range, and for detecting the concentration of chlorine dioxide gas in the enclosed space Chlorine dioxide gas concentration sensors 34 and 36, and a partition damper 50 and an emergency exhaust blower 54 for urgently exhausting the air in the closed space to the outside when the chlorine dioxide gas concentration in the closed space rises to a predetermined value. And, when a gas concentration signal is received from the chlorine dioxide gas concentration sensor and a predetermined gas concentration is detected in advance, The chlorine dioxide gas concentration for generating both the first stage output signal for controlling the opening amount of the damper and the second stage output signal for controlling the opening of the partition damper and the operation of the emergency exhaust blower It is a highly functional air shower apparatus provided with the instruction | indication adjustment means 38, It is characterized by the above-mentioned.

In the present invention, the sterilizing gas generating means 40 is disposed in a part of the closed space and a chlorine dioxide gas concentration instruction adjusting means 38 for detecting the concentration of the sterilizing gas in the closed space. The container 42 for storing the gel-stabilized chlorine dioxide, the ultraviolet irradiation device 46 for irradiating the gel-stabilized chlorine dioxide 44 in the container with ultraviolet rays, and the output of the chlorine dioxide gas concentration indication adjusting means. Accordingly, there is provided means for controlling the amount of ultraviolet rays irradiated from the ultraviolet irradiation device onto the gel-stabilized chlorine dioxide surface in the container.

In the present invention, the sterilizing gas generating means 40 appropriately changes the opening area of the container 42 containing the gel-stabilized chlorine dioxide disposed in a part of the closed space and the upper opening of the container. And a chlorine dioxide gas concentration instruction adjusting means 38 for detecting the concentration of chlorine dioxide gas in the enclosed space, and according to the output of the chlorine dioxide gas concentration instruction adjusting means The opening area of the upper part of the container by the slide damper is changed from fully closed to fully open, and the chlorine dioxide gas release amount can be controlled.

In the present invention, the sterilizing gas generating means 40 includes a chlorine dioxide gas concentration instruction adjusting means 38 for detecting the concentration of chlorine dioxide gas in the closed space, and a gel disposed in a part of the closed space. The container 42 for storing the state-stabilized chlorine dioxide, the ultraviolet irradiation device 46 for irradiating the gel-stabilized chlorine dioxide 44 in the container with ultraviolet rays, and the opening area of the upper opening of the container are appropriately changed. a slide damper 48 for, and means for controlling either one or both of the dose and the sliding damper opening amount of the ultraviolet irradiation device in accordance with the output of the chlorine dioxide gas concentration indicating controller means.

Invention according to claim 2, wherein the chlorine dioxide gas concentration indicating controller means 38, when the concentration of chlorine dioxide gas in the closed space in the air is detected to be in excess of 0.1 ppm, the UV irradiation device 46 When a first stage output signal is generated that indicates both stoppage of the valve and full closure of the opening at the top of the container by the slide damper 48, and when the concentration of chlorine dioxide gas is detected to be below 0.06 ppm. And a control means for controlling to cancel both the output signal of the first stage and restart the ultraviolet irradiation device 46 and to fully open the opening of the upper part of the container by the slide damper 48. It is an air shower device.

The invention according to claim 3, wherein the chlorine dioxide gas concentration indicating controller means 38, when the concentration of chlorine dioxide gas in the closed space in the air is detected to be in excess of 0.13 ppm, the second stage output When a signal and alarm are generated , the partition damper 50 is fully opened and the emergency exhaust blower 54 is operated to exhaust to the outside, and then it is detected that the concentration of chlorine dioxide gas has fallen below 0.09 ppm In addition, the high-performance air shower device has a control unit that controls to release the alarm, close the partition damper 50, and stop the emergency exhaust blower 54.

According to a fourth aspect of the invention, when the partition damper 50 is closed emergency exhaust blower 54 under the control of the chlorine dioxide gas concentration indicating controller unit 38 is stopped, the first chlorine dioxide gas concentration indicating controller unit 38 occurs It is a high-function air shower device that disables the one-stage output signal, manually cancels the alarm, and turns on the reset switch to start the device. After the exhaust treatment when the chlorine dioxide gas concentration exceeds 0.13 ppm, if the concentration falls below 0.09 ppm, the upper portion of the container 42 is opened by the slide damper 48 and the ultraviolet irradiation device 46 is re-opened. Start up and generate chlorine dioxide gas. At this time, by invalidating the output signal of the first stage, the processing according to the present invention is continued without performing the processing when it falls below 0.06 ppm.

Here, chlorine dioxide, which is a chemical product that exhibits an important function in the present invention, is disclosed. Chlorine dioxide (ClO ₂ ) gas is an orange-yellow gas having a melting point of −95 ° C., a boiling point of 11 ° C., and a specific gravity of 2.33. It dissolves in water at 3.0 ° C. at 25 ° C. and 20 g / l at 40 ° C. However, industrially produced high-concentration chlorine dioxide water becomes a strong oxidizing agent, and it is difficult to use it as it is due to the occurrence of high-concentration chlorine by reacting with other substances and the risk of explosion. Therefore, a 5% aqueous solution of stabilized chlorine dioxide developed by International Ryokeside Co., Ltd. has been provided as chlorine dioxide that eliminates such dangers and is easy to handle. be able to. In addition, gelled stabilized chlorine dioxide obtained by gelling such an aqueous solution is also produced. Chlorine dioxide gas obtained by vaporizing an aqueous solution or gel body of stabilized chlorine dioxide is safe without generating a strong irritating odor. By contacting the object, various bacteria, bacteria, fungi It exerts various effects such as powerful sterilization, disinfection and deodorization.

The high-performance air shower device according to the present invention was expected to have a dust removal effect mainly for floating dust in the air shower device installed at the industrial clean room entrance, A function that can be applied to a biological clean room with an effect such as deodorization added. Conventionally, air showers installed in biological clean rooms often use ultraviolet rays, negative ions, positive / negative ions, ozone, photocatalytic substances, etc., used for the purpose of sterilizing, preventing, and deodorizing airborne microorganisms. It had been. In the present invention, the use of chlorine dioxide gas that exerts effects such as stronger sterilization, deterrence, deodorization and the like against airborne microorganisms, exhibits a reliable and safe air purification effect, a high level Air purification is achieved. Therefore, it is possible to obtain a facility suitable as a high-function air shower device installed for entrance management of a biological clean room that requires a higher level of cleanliness management.

Furthermore, since the sterilization device incorporated in such an air shower device uses chlorine dioxide gas that exhibits a stronger sterilization effect than the conventional device, the gas concentration in the blown air is temporarily higher than expected. In some cases, the UV irradiation device is temporarily stopped to actively reduce the gas concentration, and the opening of the gel-stabilized chlorine dioxide container is controlled to control the natural evaporation of the gel-stabilized chlorine dioxide. Means for closing with a slide damper controlled from fully closed to fully open is provided. The concentration of chlorine dioxide gas in the enclosed space varies greatly depending on the frequency of people passing by the entrance, and the gas concentration may be higher than expected at night or on holidays when the frequency of passage is extremely low and even when there is no passage. . In such a situation, the ultraviolet irradiation device and the slide damper are controlled in accordance with the chlorine dioxide gas concentration in the closed space to take measures against abnormal rise.

Therefore, the chlorine dioxide gas concentration in the closed space where the high function air shower apparatus according to the present invention is installed is appropriately kept within a range and does not become excessively high. In addition, when the gas concentration rises due to device abnormalities, etc., it is equipped with a mechanism that forcibly ventilates the air in the enclosed space, and the safety for passing people is strictly maintained, not only floating dusts but also fungi, Safe and reliable air cleaning against airborne microorganisms such as moss is possible.

Hereinafter, embodiments of a highly functional air shower device according to the present invention will be disclosed with reference to the accompanying drawings. FIG. 1 shows the internal configuration of a preferred embodiment of a high-performance air shower apparatus 10 according to the present invention. The front side is provided with a first door (not shown), and the back side is similarly shown. It is assumed that the clean room is provided with no second door. The rectangular portion of the human body model M shown by a broken line in the center of the clean room is surrounded by the left and right wall surfaces 14 and the first and second doors (both not shown) formed on the front and rear sides. It is the closed space 12 used as a channel | path.

An appropriate number of pressurized air flow forming nozzles 18 are respectively formed on the left and right wall surfaces 14 of the closed space 12, and serve as air jet outlets as indicated by white arrows 17 in the closed space 12. Although it is configured to inject a powerful air flow by the blowers 22 and 24 incorporated for forming the pressurized air flow, it belongs to a well-known technique and will not be described in detail. It should be noted that the pressurized air flow forming nozzles 18 are formed on both wall surfaces or only on one side, are arranged in a lattice pattern of the same left and right type on each wall surface, or are arranged in a staggered pattern, and are also disposed on the ceiling surface. Whether or not to do so can be appropriately selected depending on the type, purpose, scale, and the like of the target clean room.

Below both wall surfaces 14 of the closed space in FIG. 1, an exhaust suction lattice 20 is formed for sucking exhaust 19 including dust blown off from passing objects such as a passing person M, other parts, and materials. Suction blowers 22 and 24 are arranged inside the respective exhaust suction grids 20 and pass from the left and right ventilation ducts 26 and 28 through the high function (HEPA) filter 16 to move into the purified air region 30. Then, it is circulated to the closed space 12 through the pressurized air flow forming nozzle 18. Note that the floor surface of the closed space 12 may be a grating structure, and a structure for suctioning through the underfloor ventilation path as indicated by the broken-line arrow 21 may be added. In addition, about the floor surface, a means for cleaning the shoe sole of the passing person and the outside of the shoe is required, but a description is omitted because a known structure other than air can be adopted.

Disinfecting gas concentration sensors 34 and 36 for detecting the concentration of the disinfecting gas are attached above the exhaust suction grids 20 below the both wall surfaces 14, respectively. These sterilizing gas concentration sensors 34 and 36 transmit their outputs to a gas concentration indicating controller 38 shown on the left panel of the figure via signal lines (not shown). The gas concentration indicator / regulator 38 controls the sterilization gas generation amount and gas concentration as will be described later in accordance with the outputs of the gas concentration sensors 34 and 36, and further controls the concentration control signal of chlorine dioxide gas and the excessive increase in concentration. Emergency response signals and other necessary alarms. An example of the gas concentration sensor will be described later.

Disinfecting gas generating means 40 (specific configuration will be described later with reference to FIG. 2) is installed in the space below each of the left and right wall surfaces 14 in the closed space 12. The sterilizing gas generated by the sterilizing gas generating means 40 is contained in an air jet and discharged from the pressurized air flow forming nozzle 18 into the closed space. The average concentration of the sterilizing gas in the closed space 12 is detected by the gas concentration sensors 34 and 36, and is released from the sterilizing gas generating device 40 by a signal output from the gas concentration indicating controller 38 according to the detection output. The amount of sterilization gas is controlled. In the upper part of FIG. 1, a partition damper 50, a control unit 52, and an emergency exhaust blower 54 that operate only in an emergency in which the concentration of chlorine dioxide gas, which is a sterilizing gas, is extremely increased are installed. These will be described later. .

FIG. 2 shows a configuration example of the sterilization gas (chlorine dioxide gas) generator 40. In the embodiment of the present invention, chlorine dioxide gas (ClO ₂ ) is used as the sterilization gas. In FIG. 2, the gel-stabilized chlorine dioxide container 42 is a cartridge type in which gel-stabilized chlorine dioxide 44 is housed, and the upper part is an opening. Above the upper opening of the cartridge, there is disposed an ultraviolet irradiation device 46 for accelerating the vaporization of chlorine dioxide gas by irradiating the gel-stabilized chlorine dioxide with ultraviolet rays (UV). In this case, the ultraviolet irradiation device 46 is controlled by the output of the gas concentration indicating controller 38 that operates according to the chlorine dioxide gas concentration detected by the sterilizing gas concentration sensors 34 and 36. The control mode is not limited to on / off control of UV lamps, taking into account the scale of the device, the characteristics of the applicable clean room facilities, etc., but also unit control using a plurality of UV lamps, continuous control using pulses by a thyristor control circuit, or stages Can be appropriately selected from among the control and the like.

A slide damper 48 that slides as indicated by a double-headed arrow X is provided between the container 42 containing the gel-stabilized chlorine dioxide 44 of FIG. 2 and the upper ultraviolet irradiation device 46 while contacting the opening of the container 42. be able to. The slide damper 48 is intended to further reduce the concentration of the sterilizing gas in the closed space 12. This is automatically controlled to stop the aforementioned ultraviolet irradiation device 46 when the concentration of chlorine dioxide gas in the enclosed space becomes high, but when the concentration is still high, the stabilized chlorine dioxide gel Used to prevent spontaneous evaporation of chlorine dioxide gas from the body 44.

The situation in which the gas concentration in the enclosed space becomes abnormally high in this way is when the frequency of use of the air shower device is extremely low, for example, when everyone enters the clean room and there is almost no entry and exit for a long time, It is assumed that natural transpiration from the upper opening of the container continues even when the entrance / exit is interrupted on a holiday or the like, and the air jet does not operate and a normal circulating airflow exists. Under such conditions, consideration will be given so that an excessive increase in the gas concentration in the closed space does not cause discomfort to the subsequent passers-by and adverse effects on the environment. The control of the slide damper 48 is also related to the gas concentration in the closed space, and is performed by a signal from the gas concentration indication controller 38.

As described above, the chlorine dioxide gas used in the high-function air shower device according to the present invention is basically safe for the human body as long as it is below a predetermined concentration, and is powerfully sterilized or sterilized at a relatively low concentration. Deodorizing effect is demonstrated. However, an excessively high concentration may cause an unpleasant feeling to the passerby, and there is a concern about an adverse effect such as an unpleasant feeling, so in the high function air shower device according to the present invention, the upper part of FIG. As shown, left and right partition dampers 50 and a control unit 52 that are normally closed and operate only in an emergency in which the chlorine dioxide gas concentration is extremely increased, and an emergency exhaust blower 54 are installed.

If the sterilization gas concentration sensors 34 and 36 detect that the concentration of chlorine dioxide gas, which is a sterilization gas, has abnormally increased, it is sufficient to adjust the ultraviolet irradiation lamp 46 and the slide damper 48 described above within the normal range. However, if the chlorine dioxide gas concentration further increases for some reason, when an abnormal gas concentration signal from the gas concentration indicating controller 38 is transmitted to the control unit 52, the upper partition damper 50 is released and the emergency exhaust blower 54 is turned on. Operate and control to perform emergency exhaust as indicated by the broken line arrow at the upper left of the figure. In that case, an alarm is issued. The issued alarm is manually canceled after it is confirmed that the gas concentration has returned to the normal range.

As a result, the required amount of air circulating in the air shower device is urgently exhausted and diluted with fresh air introduced from the outside, and the chlorine dioxide gas concentration decreases. If the gas concentration indicating controller 38 confirms that the concentration of chlorine dioxide gas has returned to the normal range, the partition damper 50 is closed and the emergency exhaust blower 54 is stopped to return to the steady state.

Although control at the time of entering and exiting this type of air shower device can be variously changed according to the characteristics and scale of the installation location, for example, the flow shown in FIGS. 3A and 3B is shown. . When entering the clean room, as shown in FIG. 3A, a human sensor installed in the vicinity of the first door at the entrance detects that a person who wishes to enter the room stands in front of the first door. (Step S11), the first door is opened on the condition that the closed space 12 is unattended and the second door is closed, and the user can enter the closed space (Step S12). When it is confirmed that it is safe to enter the closed space and is safe, the first door is closed (step S13).

Air shower treatment with an air jet containing a sterilization gas in a predetermined concentration range on the condition that a person who wants to enter the room enters the closed space and the first and second doors are closed, that is, dust removal and A sterilization process is performed (step S14). The air shower process in this case is performed over a predetermined time, for example, about 25 seconds to 45 seconds, according to the timer setting. The second door on the clean room (exit) side is opened on condition that the processing time has elapsed and the first door is closed, and entry into the clean room (step S15) becomes possible. After confirming that the entry has been completed through the second door, the second door is closed (step S16) to prepare for the next operation for the subsequent visitors or exits.

The flow when a person who wants to leave the clean room leaves is as shown in FIG. When a human sensor installed in the vicinity of the second door on the clean room side detects that the person who wants to leave the room stands in front of the second door (step S21), the closed space is unmanned and the first door is The second door is opened on the condition that it is closed, and enters the closed space (step S22). When it is confirmed that the user has surely entered the closed space, the second door is closed (step S23). When leaving the clean room, it is generally not necessary to operate the air shower device, so the first door is opened as it is to leave (step S24). When the human sensor detects that the exit has been completed, the first door is closed, and a series of exiting operations are terminated to prepare for the entrance or exit of the subsequent person (step S25). In these flows, the first and second doors are all opened and closed automatically. However, some parts are manually operated, there are interlocks, but most are manually operated. Various systems such as doors can be used.

The concentration control of the chlorine dioxide gas in the closed space 12 in the high-performance air shower apparatus according to the present invention is performed by adjusting the gas concentration indication controller 38 in consideration of various conditions depending on the use of the clean room, the scale, the passing frequency, the number of subjects, and the like. It can be set as follows. However, such setting values or setting ranges are merely examples, and are not limited to these values. For example, when the concentration of chlorine dioxide gas in the air in the closed space 12 is equal to or lower than the lower limit set value 0.06 ppm, the activation signal by the ultraviolet irradiation device 46 is strengthened to increase the chlorine dioxide gas. The output signal increases the density of the light. On the other hand, when the concentration of chlorine dioxide gas in the air reaches the set upper limit of 0.1 ppm, the activation function of the ultraviolet irradiation device 46 is reduced so that the concentration of chlorine dioxide gas does not increase any more. Such an output signal is generated.

In response to these first-stage output signals, the ultraviolet irradiation device 46 controls the on / off control when the ultraviolet generating means is a single device, the voltage control for changing the operating voltage, and is stable in the case of a discharge lamp. Perform pulse control to adjust the irradiation dose by discharge. In the case of an apparatus using a plurality of ultraviolet irradiation sources, the activation function for the gel-stabilized chlorine dioxide 44 is adjusted by controlling the number of units or the like so as to maintain the gas concentration within a predetermined range. Further, in this case, a configuration is adopted in which the container upper open portion can be closed by the slide damper 48 in order to maintain the gas concentration in the normal range.

Furthermore, when the concentration of chlorine dioxide gas in the air inside the enclosed space 12 reaches an extreme concentration exceeding 0.13 ppm, maintaining a high level for a long time has an unexpected impact on the human body and the environment. Therefore, it is necessary to perform a control that immediately reduces the concentration of chlorine dioxide gas. However, the adjustment of the activation function by the control of the ultraviolet irradiation device 46 and the adjustment by the slide damper cannot be expected to be effective immediately due to a time lag due to the amount of air in the air shower device. Accordingly, when the concentration of chlorine dioxide gas in the air in the closed space 12 reaches an extreme level of, for example, 0.13 ppm, an alarm is issued and the partition damper 50 above the left and right ducts 26 and 28 in FIG. 1 is opened. At the same time, the emergency exhaust blower 54 is driven to control the exhaust of the chlorine dioxide gas-containing air as indicated by the white arrow on the upper left. By such an operation, fresh air from the outside is introduced and replaced in the closed space, and the chlorine dioxide gas concentration can be reduced in a short time. In this case, by disabling the first stage output signal generated by the chlorine dioxide gas concentration indication adjusting means, the slide damper 48 when the gas concentration falls below 0.06 ppm causes the opening at the top of the container to The restarting process is not performed, and the device according to the present invention continues to drive.

Such a high-performance air shower device for a clean room is designed to remove dust by generating a powerful wind speed with an air jet when a person entering or leaving the room is detected by a human sensor, and sterilizing with the contained chlorine dioxide gas. Done. However, when there is no passage of the person entering or leaving the room, it is sufficient to simply generate a gentle air flow, and the chlorine dioxide gas concentration for sterilization is only a slight predetermined level. Therefore, the ultraviolet irradiation device 46 for evaporating chlorine dioxide gas does not need to be operated.

On the other hand, if the state of zero visitors is long, such as during closed hours, late at night, holidays, etc., the natural condition of chlorine dioxide gas even if the ultraviolet irradiation device 46 does not operate. There is a risk that the concentration of chlorine dioxide gas in the enclosed space may become higher than necessary due to transpiration. In such a state, an initial passer-by when resuming use passes in a state where the chlorine dioxide gas concentration is high, and there is a possibility of feeling uncomfortable feeling as described above. In order to prevent such a situation, in the present invention, as shown in FIG. 2, a slide damper 48 is disposed so as to contact the upper opening of the gel-stabilized chlorine dioxide container 42, and the natural evaporation of chlorine dioxide gas. Is suppressed as much as possible, and an undesired increase in chlorine dioxide gas concentration when not in use for a long time can be suppressed. The slide damper 48 is configured to be capable of adjusting the opening ratio of the gel-stabilized chlorine dioxide container not only in two-position control of full opening and full closing but also in two or more multi-stages. Since the combination with 46 is diversified, finer gas transpiration control is possible.

FIG. 4 shows the principle of chlorine dioxide gas concentration sensors 34 and 36 suitable as gas concentration sensors. A detection electrode 64, a counter electrode 66, and a reference electrode 68 are disposed in the electrolytic solution 62 filled in the container 60, and a gas permeable diaphragm 70 is provided at the opening of the container 60. When chlorine dioxide (ClO2) gas passes through the gas permeable diaphragm 70 of the chlorine dioxide gas concentration sensor configured as described above, the following chemical reaction occurs.
ClO ₂ + 4H ⁺ + 5e ⁻ → Cl ⁻ + 2H ₂ O

From the result of such a chemical reaction, the detection electrode 64, the counter electrode 66, and the reference electrode 68 of FIG. 4 are added to the potential generation circuit 72, respectively, and the detection current from the counter electrode 66 is caused to flow through the resistor R74. A proportional gas concentration output signal is obtained. The gas concentration sensor having such a configuration can be advantageously used as the chlorine dioxide gas concentration sensors 34 and 36 in FIG. 1, and the output thereof is applied to the gas concentration indicating controller 38 to adjust the gas concentration as described above. It is the basis for various controls. The gas concentration sensor shown here is merely an example, and other types of sensors may be used.

The high-function air shower device according to the present invention has a function of sterilizing or removing various floating microorganisms and a deodorizing function in addition to removal of suspended fine particles. The chlorine dioxide gas used here is more effective than conventional positive and negative ions, ultraviolet rays, photocatalysis, ozone, etc., and has been designed to maintain safety to the human body and the environment. It is. Therefore, the highly functional air shower apparatus according to the present invention can be advantageously applied not only to an industrial clean room but also to a biological clean room.

It is explanatory drawing which shows the structural example of the highly functional air shower apparatus which concerns on this invention. It is explanatory drawing which shows the basic composition of the chlorine dioxide gas generation means which can be used for the highly functional air shower apparatus which concerns on this invention. It is a flowchart which shows the operation | movement at the time of entering / leaving in the high performance air shower apparatus which concerns on this invention. It is explanatory drawing which shows the basic composition of the chlorine dioxide gas concentration sensor which can be used for the highly functional air shower apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 High function air shower apparatus 12 Closed space 14 Wall surface 16 High function (HEPA) filter 18 Pressurized air flow formation means (Pressurized air flow formation nozzle)
19 Exhaust flow 20 Exhaust suction means (exhaust suction grid)
22, 24 Suction blowers 26, 28 Ventilation duct 30 Cleaned air region 34, 36 Disinfecting gas concentration sensor 38 Chlorine dioxide gas concentration indicating adjusting means (gas concentration indicating adjusting device)
40 Disinfection gas generation means (chlorine dioxide gas generator)
42 Gel Stabilized Chlorine Dioxide Containment Container 44 Gel Stabilized Chlorine Dioxide 46 Ultraviolet Irradiation Device 48 Slide Damper 50 Partition Damper 52 Control Unit 54 Emergency Exhaust Blower 60 Container 62 Electrolytic Solution 64 Detection Electrode 66 Counter Electrode 68 Reference Electrode 70 Gas Permeation Sexual diaphragm 72 Potential generation circuit 74 Resistance R

Claims (4)

It is a closed space formed between the first door installed on the outside side of the entrance to the clean room, the second door installed on the clean room side, and the first door and the second door. Collecting exhaust air flow including dust discharged from the wall or ceiling, pressurized air flow forming means for generating air jet effective for removing suspended particulates from the wall and ceiling, and clothes or articles passing by In an air shower apparatus comprising: an exhaust suction means for performing, and a high function (HEPA) filter that passes when the exhaust air from the exhaust suction means is purified and circulated to the pressurized air flow forming means,
A container for accommodating gel-stabilized chlorine dioxide disposed in a part of the enclosed space; an ultraviolet irradiation device for irradiating the gel-stabilized chlorine dioxide in the container with ultraviolet light; A slide damper for appropriately changing the opening area of the upper opening, and chlorine dioxide gas (ClO ₂ ), which is a sterilizing gas for sterilizing floating microorganisms existing in the enclosed space, A disinfecting gas generating means that discharges while controlling to a concentration range;
A chlorine dioxide gas concentration sensor for detecting the concentration of chlorine dioxide gas in the enclosed space;
A partition damper and an emergency exhaust blower for urgently exhausting the air in the enclosed space to the outside when the chlorine dioxide gas concentration in the enclosed space rises to a predetermined value;
One-stage output for controlling the irradiation amount of the ultraviolet irradiation device and the opening amount of the slide damper when a predetermined gas concentration is detected by receiving a gas concentration signal from the chlorine dioxide gas concentration sensor And a chlorine dioxide gas concentration indication adjusting means for generating both a signal and a second stage output signal for controlling the opening of the partition damper and the operation of the emergency exhaust blower. High performance air shower device. The chlorine dioxide gas concentration indicating controller means, when the concentration of chlorine dioxide gas in the closed space in the air is detected to be in excess of 0.1 ppm, of the container top by stop and said slide damper of the ultraviolet irradiation device Generating a first stage output signal indicating both full opening and closing;
When it is detected that the concentration of chlorine dioxide gas is less than 0.06 ppm, the output signal of the first stage is canceled, the ultraviolet irradiation device is restarted , and the opening of the upper portion of the container by the slide damper is detected . The high-function air shower apparatus according to claim 1 , further comprising a control unit that performs control so as to perform both of full opening. The chlorine dioxide gas concentration indicating controller means, when the concentration of chlorine dioxide gas in the closed space in the air is detected to be in excess of 0.13 ppm, an output signal and an alarm of the second stage occurs, the partition damper Fully open and operate the emergency exhaust blower to control exhaust to the outside ,
After that, when it is detected that the concentration of chlorine dioxide gas has fallen below 0.09 ppm , it has a control means for canceling the alarm, closing the partition damper and controlling the emergency exhaust blower to stop. The high function air shower apparatus according to claim 1 . When the partition damper is closed by the control of the chlorine dioxide gas concentration indication adjusting means and the emergency exhaust blower is stopped, the output signal of the first stage generated by the chlorine dioxide gas concentration indication adjusting means is invalidated and manually alarmed. The high function air shower apparatus according to any one of claims 1 to 3 , wherein the apparatus is activated by releasing the switch and turning on a reset switch.

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