KR100625769B1 - Biohazard safety cabinet and operation control method thereof - Google Patents

Abstract

According to the present invention, a blower for generating a circulation airflow; A cabinet housing in which a work space is formed at an inner side of the work door so as to be opened and closed by a work door, and in which the circulation air generated by the blower flows in and out; A circulation duct for forming a circulation passage so that the circulation air flowed out of the cabinet housing can flow back into the cabinet housing; A pretreatment filter installed at the inlet side of the circulation airflow in the cabinet housing; A high-efficiency electrostatic filtration filter including a plasma generator for generating a low-temperature plasma downstream of the pre-treatment filter so that the suspended particulates contained in the circulating air are attached to the electrodes by the charging and diffusion phenomena caused by the low-temperature plasma; A UV composite photocatalyst for sterilizing biohazard suspended particulates contained in the circulating air and removing harmful gases by using a photocatalyst activated by UV downstream of the high efficiency electrostatic filtration filter; A sterilizing active material generator for sterilizing biohazard suspended particulates using a sterilizing active material generated by a low temperature plasma discharge of the sterilizing plasma generator downstream of the UV composite photocatalyst; And a slim high efficiency filter for filtering suspended particulates downstream of the sterilizing active material generating device.

Biohazard Safety Cabinet, BSC, Filtration, Sterilization

Description

Biohazard safety cabinet and operation control method

1 is a block diagram showing a biohazard safety cabinet according to an embodiment of the present invention,

2 is a block diagram showing that the glove is provided on the front of the cabinet housing shown in FIG.

Conceptual diagram for explaining the operation of the high efficiency electrostatic filtration filter shown in FIG.

Figure 4 is a conceptual diagram for explaining the action of the sterilizing active material generating device shown in Figure 1,

5 is a conceptual diagram showing the suspended particulate detection unit of the monitoring system shown in FIG.

6 is a conceptual diagram showing a residual ozone measuring unit of the monitoring system shown in FIG.

7 is a conceptual diagram for explaining the operation control method of the biohazard safety cabinet shown in FIG.

8 is a block diagram showing a biohazard safety cabinet according to another embodiment of the present invention,

9 is a conceptual diagram for explaining the operation of the monitoring system for branch duct shown in FIG.

<Explanation of symbols for the main parts of the drawings>

10, 20: biohazard safety cabinet 11: circulating duct

100: cabinet housing 110: blower

120: pretreatment filter 130: high efficiency electrostatic filtration filter

140: UV composite photocatalyst 150: bactericidal active material generator

160: slim high efficiency filter 170: suspended particulate detection unit

180: residual ozone measuring unit 190: monitoring system

210: branch duct 220: damper

230: High efficiency electrostatic filtration filter for branch duct

240: sterilization active material generator for branch duct

250: UV composite photocatalyst for branch duct

260: Slim type high efficiency filter for branch duct

270: floating particulate detection unit for branch duct

280: Residual ozone measuring unit for branch duct

290: Monitoring system for branch duct

The present invention relates to a Biohazard Safety Cabinet (BSC), and more particularly, to remove harmful gases to maintain high clean conditions, as well as to filter and sterilize suspended particulates including micro-organisms (Bio aerosol). A biohazard safety cabinet can protect workers from biohazards.

In the so-called Bio-Technology (BT) industry, such as intractable medical, pharmaceutical, or concentrated fisheries related to infectious diseases, hereditary diseases, cancer, etc., the working environment must be maintained at a high clean condition when the operator manipulates the work object. In addition, it must be able to protect workers from biohazard such as floating microorganisms floating in the air. This is because when the microorganisms are introduced into the human body, they penetrate into the lungs through the respiratory system or cause various bacterial and viral diseases while staying inside the human body such as the digestive organs. Therefore, interest and demand for biohazard safety cabinets in which workers can safely perform work is increasing.

Recently, more and more attention has been paid to technology for maintaining the safety of micro-organisms such as Severe Acute Respiratory Syndrome (SARS) and Anthrax, which threaten people's lives all over the world. There is an increasing demand for more optimized, high-quality biohazard safety cabinets.

In the conventional biohazard safety cabinet disclosed to date, part of the biohazard safety cabinet, which is generated by work activities in the biohazard safety cabinet, is circulated to remove various biomaterials circulating in the device by staying or floating in the workspace. Microorganisms in the discharged air stream are filtered using a High Efficiency Particulate Air (HEPA) filter or an Ultra Low Penetration Absolute (ULPA) filter, as if dust in the air is removed. In addition, when the work is stopped or finished, ultraviolet rays (Ultraviolet; UV) is irradiated to the front and rear ends of the filter to sterilize the microorganisms caught in the filter. In some cases, microorganisms are sterilized using chemical agents. In order to ensure worker safety from micro-organisms, pressure differential sensors are used to detect some of the circulating air in the biohazard safety cabinet to be leaked to the operator, which is operated in conjunction with the alarm function.

However, the conventional biohazard safety cabinet as described above has the following problems.

First, since micro organisms are often generated during the working process, and the cleanliness of the work space may change from time to time depending on the behavior of the worker and the contents of the target work, the suspended particulates containing the micro organisms that can be leaked to the workspace or the worker in real time. Should be able to monitor and respond. However, in the conventional biohazard safety cabinet, the working space is made into a negative pressure condition to prevent the leakage of suspended particulates including micro organisms. Also, in the leakage detection, the differential pressure sensor is used to simply block the leakage to the worker. have. That is, there is a problem in that there is no system that can cope with real-time monitoring and coagulation of fine particles containing microorganisms that can be leaked to the workspace or worker.

Second, in the case of maintenance, the conventional biohazard safety cabinet adopts a method in which UV lamps irradiate UV toward the work space immediately before the HEPA filter or ULPA filter to remove microorganisms in the irradiation area immediately after the operation. There is a problem that the microorganisms present in the circulation passage are not removed. That is, the problem that the microorganisms existing in the UV non-irradiation region flow out or the microorganisms attached to the flow path are detached is not considered.

Third, in the conventional biohazard safety cabinet, since the filter has a large filtration load, it is necessary not only to replace the filter periodically but also to apply a UV irradiation sterilization method that requires frequent replacement in the required sterilization, and thus, the durability of the filter is short and the filter replacement is performed. There is always a risk due to the release of microorganisms which may occur.

The present invention has been made to solve the above-mentioned problems, the biohazard that can detect the suspended particulates containing micro-organisms in real time to prevent contamination of the target material and related precision equipment and the operator can safely perform the target work Its purpose is to provide a safety cabinet.

In addition, another object of the present invention is to provide a biohazard safety cabinet capable of safely removing micro-organisms present in the UV non-irradiated region such as the circulation passage as well as the UV irradiated region.

Still another object of the present invention is to provide a biohazard safety cabinet that can be used semi-permanently without replacing the filter by reducing the filtration load of the filter.

Other objects and advantages of the invention will be described below and will be appreciated by the embodiments of the invention. In addition, the objects and advantages of the invention may be realized by the means and combinations indicated in the claims.

Biohazard safety cabinet according to an aspect of the present invention, the blower for generating a circulation airflow; A cabinet housing in which a work space is formed at an inner side of the work door so as to be opened and closed by a work door, and the cabinet housing into which the circulation air generated by the blower flows in and out; A circulation duct forming a circulation passage so that the circulation airflow discharged from the cabinet housing can be introduced back into the cabinet housing; A pretreatment filter installed at an inlet side of the circulation airflow in the cabinet housing; Including a plasma generator for generating a low-temperature plasma downstream of the pretreatment filter in the flow of the circulating air, high efficiency to remove the suspended particulates contained in the circulating air attached to the electrode by the charging and diffusion phenomena due to the low temperature plasma An electrostatic filter; A UV composite photocatalyst for sterilizing biohazard suspended particulates contained in the circulation stream and removing harmful gases using a photocatalyst activated through UV downstream of the high efficiency electrostatic filtration filter in a flow stream of the circulation stream; A sterilizing active material generating device for sterilizing biohazard suspended particulates using a sterilizing active material generated by the low temperature plasma discharge of the sterilizing plasma generating unit downstream of the UV composite photocatalyst in the flow of circulating air; And a slim high efficiency filtration filter for filtering the suspended particulates downstream of the sterilizing active substance generating device in the flow of the circulating air stream.

The biohazard safety cabinet may further include a monitoring system that includes a floating particulate detection unit and an ozone sensor in a working space of the cabinet housing to detect floating particulates and residual ozone in a circulation airflow in real time. The monitoring system may include a cleanliness display unit that displays information on the detected suspended particulates and residual ozone, a warning unit that generates a warning signal when the amount of detected suspended particulates and residual ozone exceeds a set reference value; The control unit may further include a control unit configured to control the cleanliness display unit and the warning unit in response to the signal detected by the particulate detection unit and the ozone sensor, and to open and control the work door of the cabinet housing.

The biohazard safety cabinet may further include a branching duct branched from the circulation duct to form a branch passage through which a part of the circulation air is discharged to the outside. Here, the branch duct sterilizing active material generator for branch duct to sterilize the biohazard floating fine particles by using the sterilizing active material generated by the low-temperature plasma discharge of the sterilizing plasma generating unit in sequence along the flow of the discharge air; Including a plasma generator for generating a low-temperature plasma, high-efficiency electrostatic filtration filter for branch ducts to remove suspended particulates contained in the circulating air to the electrode by the charging and diffusion phenomena due to low-temperature plasma, and ultraviolet ( UV composite photocatalyst for branch duct to sterilize biohazard suspended particulates contained in circulating air and remove harmful gas by using photocatalyst activated through UV) and slim high efficiency filter for branch duct to filter suspended particulates It is preferable. In addition, the biohazard safety cabinet includes a floating particulate detection unit and an ozone sensor downstream of the slim high efficiency filtration filter for branch ducts in the flow of the exhaust stream to detect floating particulates and residual ozone in the exhaust stream in real time. A branching duct monitoring system may be further provided.

In addition, according to another aspect of the present invention, as a method of controlling the operation of the biohazard safety cabinet, in the case of a work mode in which the operator performs a work on the work object of the workspace, for sterilization of the sterilizing active material generating device The operation control method of the biohazard safety cabinet which cuts off a power supply to the discharge electrode of a plasma generation part, and supplies power to the discharge electrode of the plasma generation part of an electrostatic discharge filter of the said high efficiency electrostatic filtration filter is provided.

Furthermore, according to another aspect of the present invention, as a method of controlling the operation of the biohazard safety cabinet, in the case of sterilization mode in which the sterilization mode in which the work space is closed by closing the work door, the sterilization active material is generated. Disclosed is a method of controlling an operation of a biohazard safety cabinet in which power is supplied to a discharge electrode of a sterilizing plasma generation unit of a device, and a power is supplied to a discharge electrode of an electrostatic plasma generation unit of the high efficiency electrostatic filtration filter.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the ordinary or dictionary meanings, and the inventors should properly apply the concept of terms to explain their own invention in the best way. Based on the principle that the definition can be made in a simple manner, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

1 is a block diagram showing a biohazard safety cabinet according to an embodiment of the present invention.

Referring to the drawings, the biohazard safety cabinet 10 according to an embodiment of the present invention, a blower 110 for generating a circulating air flow, and a cabinet into which the circulating air generated by the blower 110 flows in and out The housing 100 and the circulation duct 11 which forms a circulation flow path so that the circulation airflow from this cabinet housing 100 can enter the cabinet housing 100 again.

A work space 102 is formed at one side of the cabinet housing 100, and a work door 101 that opens and closes the work space may be provided at a front surface of the cabinet housing 100. On the other hand, the front of the cabinet housing 100, as shown in Figure 2, the work object disposed in the work space even if the work door 101 is closed so that the circulation airflow of the work space 102 can not be discharged A glove 103 may be provided in which a hand receiver 103a is formed to insert a worker's hand to access a work object so as to be manipulated. Through the glove 103, the worker performs the work, it is possible to ensure more safety from the risk of biohazard.

Referring back to FIG. 1, the filtration-sterilization filter and apparatus for filtering-sterilizing the circulating air flow in the interior 100 of the cabinet housing are installed. A pretreatment filter 120, a high efficiency electrostatic filtration filter 130, a UV complex photocatalyst 140, a sterilizing active material generator 150, and a slim type high efficiency filtration filter 160 along the flow from the inlet of the circulation airflow ) Are arranged sequentially.

The pretreatment filter 120 removes some of the large particles and harmful gases of several microns or more. As the pretreatment filter 120, it is preferable to use a material having antimicrobial properties such as antibacterial plastic, catechin, chitosan and nano metal.

The high efficiency electrostatic filtration filter 130 includes at least one electrostatic plasma generator 131 for generating low temperature plasma. A pair of electrodes 132 and 133 are disposed in the plasma generator 131 so as to be spaced apart from each other. The electrodes 132 and 133 may use copper (Cu), iron (Fe), silver (Ag), gold (Au), aluminum (Al), tungsten (W), or the like. One selected electrode or both electrodes of the pair of electrodes 131 and 132 use a porous conductor formed of a mesh or a porous plate. In addition, one or a selected electrode of the pair of electrodes 132 and 133 may be coated with a dielectric. Such dielectrics may be ceramic, plastic, glass, mica, oil, and the like.

3 is a conceptual diagram illustrating the operation of the high efficiency electrostatic filtration filter 130. As shown, when the AC power connected to the variable DC type power supply, the DC pulse type power supply or the function generator of positive or negative charge is supplied from the power supply unit 194 to the discharge electrode 133, a low temperature plasma is formed between the two electrodes 132 and 132. Occurs. At this time, while the circulation airflow passing through the pretreatment filter 120 passes through the low-temperature plasma electric field region formed between the two electrodes spaced at a predetermined interval, particles of about 0.5 μm or more of the suspended particulates are electrically charged and then electrostatically attracted by the electric field. The particles attached to the electrode are removed, and particles of about 0.5 μm or less are attached to and removed from the electrode formed of a mesh or a porous plate by diffusion phenomenon due to Brownian movement with a slightly weaker electrostatic attraction than the particles of larger size. As described above, the high efficiency electrostatic filtration filter 130 removes ultra fine suspended particles having a size of micron and submicron by electrostatic attraction and diffusion due to charging, thereby minimizing particulate load in the slim type high efficiency filtration filter 160 which will be described later. This makes it possible to slim the slim high efficiency filter 160 and increase its performance and lifespan.

The ultraviolet (UV) composite photocatalyst unit 140 removes harmful gases in the circulation air stream, and sterilization remains in the circulation air stream so that the sterilization active material generated in the sterilization active material generator 150, which will be described later, does not enter the work space. It decomposes active substances, in particular ozone, and sterilizes suspended particulates containing microorganisms that are suspended in the circulating air stream during the decomposition process or floated or attached to the photocatalyst filter 141. The UV alone does not remove harmful gases, ozone and suspended particulates, but activates the photocatalyst of the photocatalyst filter 141 configured together to accelerate the removal of harmful gases and suspended particulates. In addition, it is possible to reduce the deterioration rate of the catalyst as compared to when the catalyst alone, to maximize the operating life. The photocatalyst filter 141 may be used as a catalyst carrier by selecting one or more of metal, metal oxide, semiconductor, semiconductor oxide, activated carbon, zeolite, silica gel, and ceramic. In addition, the photocatalyst filter 141 may be used by coating the carrier surface with a metal, metal oxide, semiconductor, semiconductor oxide, activated carbon, zeolite, silica gel, or ceramic catalyst. Ultraviolet (UV) radiation to the photocatalyst is preferably UV-A type of 300nm to 400nm wavelength range. In addition, the light source 142 irradiating UV to the photocatalyst may use one of a UV light-emitting display (LED), a cold cathode lamp, and a heat tube type UV lamp. The UV light source method has a lifespan of up to 10 times longer than conventional lamps and no by-products, and may have safety against UV leakage to the outside. In particular, among the catalytic materials of the photocatalyst filter, in particular, TiO ₂ (titanium dioxide) is active in the UV region A, and most of the catalysts have a small amount of degassing performance due to UV irradiation.

The sterilizing active material generator 150 includes at least one sterilizing plasma generating unit 151 for generating a low temperature plasma. A pair of electrodes 152 and 153 are disposed in the capacitive plasma generator 151 so as to be spaced apart from each other. Copper (Cu), iron (Fe), silver (Ag), gold (Au), aluminum (Al), tungsten (W), and the like may be used as the electrodes 152 and 153. At least one of the pair of electrodes 152 and 153 facing each other is a conductor having a shape selected from a pin, a plate wire, a cylinder, and a mesh plate. desirable. Thus, various electrode configurations such as wire-plate, wire-cylinder, pin-plate, plate-plate, pin-pin and wire-wire are possible. In addition, one or a selected one of the pair of electrodes 152 and 153 may be coated with a dielectric. Such dielectrics may be ceramic, plastic, glass, mica, oil, and the like.

4 is a conceptual diagram for explaining the action of the bactericidal active material generating device 150. As shown in the drawing, when a variable DC type power source, a DC pulse type power source, or an AC power source connected to a function generator is supplied from the power supply unit 194 to the discharge electrode 153, sterilization active materials such as ozone, various ions, radicals, etc. Occurs. The generated sterilizing active material passes through the slim high efficiency filtration filter 160 at the rear of the system to permanently deactivate the suspended particulates caught in the filter media, and is then generated in the work space 102 itself and suspended or attached suspended particulates. It also permanently deactivates. In addition, after permanently deactivating the suspended particulates attached to the various devices or suspended in the circulation air flow, and permanently deactivated to the suspended particulates attached to the pretreatment filter 120, and finally the residual amount in the UV composite photocatalyst 140 As it is extinguished, any sterilization of unsustained suspended or adherent bacteria takes place.

The slim type high efficiency filtration filter 160 can reduce the pressure drop to less than half as compared to the conventional one, thereby minimizing the blower 110 power and noise. The slimming of the high efficiency filtration filter 160 can be achieved by a complementary hybrid system configuration that removes most of the suspended particulates that were removed by the existing filter alone from the high efficiency electrostatic filtration filter 130 at the front end. The slim high efficiency filtration filter 160 may use one of HEPA, ULPA, and e-HEPA in which the filtration medium is electrostatic.

On the other hand, as shown in Figure 1, the biohazard safety cabinet 10 according to an embodiment of the present invention, may further include a monitoring system for detecting in real time suspended particulates and residual ozone in the circulation airflow. . To this end, the floating particulate detection unit 170 and the residual ozone measuring unit 180 are provided in the work space 102 of the cabinet housing 100.

5 is a conceptual diagram for explaining the action of the floating particulate detection unit 170. As shown in the figure, the floating fine particle detection unit 170 is provided with a charging device 173 for charging the floating fine particles of the circulation airflow, and the front and rear of the charging device 173 to remove ions respectively. Ion traps (171, 172), one or more stages of impactor 174 in which the charged fine particles charged in the charging device 173 collides through the nozzle 175, and generated by the floating fine particles collide with the impactor 174 It includes a microammeter 176 for sensing the current. In detail, the front ion trap 171 removes ions that are present in the circulation airflow and cause an error in the detection of the floating particles in real time. The intake airflow from which ions are removed passes through the monopolar floating fine particle charging device 173, and the fine particles in the circulation airflow have a certain amount of electrical charge. The charged and remaining of the generated ions are removed in the second ion trap 172 again. Particles charged in a certain amount generate an electrical signal by contacting the impactor 174, which is a conductor impingement plate, after the particle diameter is separated by a nozzle 175 designed to pass a specific particle diameter, which causes the microammeter 175 to measure it. do. In other words, the electrical signal is converted into the concentration of the particles to check the level of cleanliness.

6 is a conceptual diagram for explaining the operation of the residual ozone measuring unit 180. As shown, the residual ozone measuring unit 180 adopts a method of sensing through an electrical signal generated when the circulation airflow reaches the residual ozone measuring unit 180 by forced suction or diffusion, ozone detection is ozone Adsorption, post-sorption reaction and detection of electrical signals generated during the reaction. The residual ozone measuring unit 180 is maintained in the sterilization active material generating device 150 to maintain safety by preventing damage to workers, target materials and devices by ozone remaining after circulation-sterilization for a predetermined time. Optimize.

The monitoring system 190 configured as described above, as shown in Figure 7, by displaying the information on the suspended particulates and residual ozone detected by the suspended particulate detection unit 170 and the residual ozone measuring unit 180 Cleanliness display unit 191 indicating cleanliness, a warning unit 192 for generating a warning signal when the detected amount of suspended particulates and residual ozone exceeds a set reference value, floating particulate detector 170 and residual ozone measuring unit The controller 193 controls the cleanliness display unit 191 and the warning unit 192 and controls opening and closing of the work door 101 of the cabinet housing 100 in response to the detected signal at 180. The mode serves to ensure safety for the operator, the material to be worked on and the device. That is, it is possible to provide the user with information about whether the biohazard safety cabinet 10 is used or to control the overall operation.

Hereinafter, an operation control method of a biohazard safety cabinet according to an embodiment of the present invention will be described with reference to FIGS. 1 and 7.

First, in FIG. 7, when the operation mode is being performed using the biohazard safety cabinet, the control unit 193 causes the power supply unit 194 to sterilize the plasma generation unit 151 of the sterilization active material generator 150. The power supply is cut off to the discharge electrode 153 of the N s, and the power is supplied to the discharge electrode 133 of the plasma generator 131 of the high efficiency electrostatic filtration filter 130. Then, the operation control of the biohazard safety cabinet 10 is performed in the following process.

The circulation airflow generated through the blower 110 passes through the pretreatment filter 120 to remove some of the large particles and harmful gas of several microns or more. Then, the circulation airflow is removed by allowing the suspended particulates to adhere to the electrodes by the charging and diffusion shapes through the high efficiency electrostatic filtration filter 130 generating low temperature plasma. Thereafter, the circulation airflow removes harmful gas in the circulation airflow through the UV in the UV composite photocatalyst 140. Finally, the circulation airflow passes through the slim high efficiency filtration filter 160 and once again removes suspended particulates to become a clean airflow. As such, the circulation airflow introduced into the working space can be monitored for the cleanliness of the airflow throughout the process through the floating fine particle detection unit 170 for detecting the floating fine particles in real time. In addition, the clean airflow introduced into the work space 102 prevents contamination of the target work, and the suspended particulates generated during the work are again subjected to the high efficiency electrostatic filtration filter 130, the UV composite photocatalyst 140, and the slim type high efficiency along the circulation airflow. Continuous cleanliness may be maintained through the filtration filter 160.

Next, in the sterilization mode in which sterilization is performed using the biohazard safety cabinet, the controller 193 causes the power supply unit 194 to discharge the sterilization plasma generator 151 of the sterilization active material generator 150. Power is supplied to the electrode 153, and the power is cut off to the discharge electrode 133 of the plasma generator 131 of the high efficiency electrostatic filtration filter 130. Then, the operation control of the biohazard safety cabinet is performed as follows.

The circulation airflow generated through the blower 110 passes through the pretreatment filter 120 to remove some of the large particles and harmful gas of several microns or more. The circulation airflow removes harmful gas in the circulation airflow through the UV in the UV composite photocatalyst 140. The circulating air sterilizes the biohazard material remaining in the circulating air through the sterilizing active material generating device 150. The circulation airflow passes through the slim high efficiency filter 160 to once again remove suspended particulates to become a clean airflow. The circulated circulation stream is rapidly absorbed by the UV composite photocatalyst unit 140, and the harmful gas component is quickly adsorbed to the adsorptive photocatalyst carrier or the catalyst itself. It decomposes into oxygen molecules and completely processes harmful gas components and unsterilized biohazard materials by active oxygen and radicals from the decomposition process. In detail, the generated bactericidal active material may sterilize the biohazard material attached to the high efficiency electrostatic filtration filter 130 and then completely process the unsterilized biohazard material in the UV composite photocatalyst unit 140 thereafter. . The exhaust gas that has passed up to the slim high efficiency filtration filter 160 is optimized by the particle detection unit 170 and the residual ozone measurement unit 180 to maintain safety and maintain efficiency.

Hereinafter, a biohazard safety cabinet will be described according to another embodiment of the present invention. 8 is a block diagram showing a biohazard safety cabinet according to another embodiment of the present invention. Here, the same reference numerals as those shown in FIGS. 1 to 7 denote the same members having the same configuration and function, and thus repetitive description thereof will be omitted.

Referring to the drawings, the biohazard safety cabinet 20 according to another embodiment of the present invention, in the biohazard safety cabinet 10 according to an embodiment of the present invention as described above, the circulation duct 11 It is further provided with a branch duct 210 branched from the branch to form a branch passage through which a part of the circulation air is discharged to the outside. To this end, dampers 220 are installed at branch points of the circulation duct 11 and the branch duct 210 to adjust the amount of discharged air flow. That is, as a part of the exhaust type for discharging some of the circulation air to the outside, the ratio of the discharged air flow can be set to various conditions from 0.01% to 99.99%, as shown in Figure 8, by the control unit 293 The control is performed by controlling the opening and closing degree of the damper 220.

In the branch duct 210, the sterilization active material generator 230 for branch duct to sterilize the biohazard floating fine particles using the sterilization active material generated by low temperature plasma discharge in sequence along the flow of the discharge air; By using a high efficiency electrostatic filtration filter 240 for branch ducts to generate low-temperature plasma so that the fine particles contained in the circulation air by the charging and diffusion phenomena attached to the electrode and to remove it, and using the photocatalytic activated through ultraviolet (UV) The UV composite photocatalyst 250 for branch ducts for sterilizing the biohazard suspended particulates contained in the circulating air and removing the harmful gas, and the slim type high efficiency filtration filter 260 for branch ducts for filtering the suspended particles. Here, the sterilizing active material generator 230 for the branch duct, the high efficiency electrostatic filter 240 for the branch duct, the UV composite photocatalyst unit 250 for the branch duct, and the slim type high efficiency filter for the branch duct 260 are circulating airflow. It has the same configuration corresponding to the sterilizing active material generating device 150, the high efficiency electrostatic filtration filter 130, the UV photocatalyst unit 140, the slim type high efficiency filtration filter 160 for circulating air to filter-sterilize, Repeated description thereof will be omitted.

Further, downstream of the branch duct slim type high efficiency filtration filter 260, a branch duct floating fine particle detection unit 270 and a branch duct residual ozone measuring unit 280 are provided to provide the suspended particulates and residual particles present in the discharge air stream. There is a monitoring system for branch ducts that detect ozone in real time. The airborne fine particle detection unit 270 and the branched duct residual ozone measurement unit 280, the airborne microparticles for circulating air to detect the airborne fine particles and residual ozone of the circulation airflow in real time 170) and the branched duct residual ozone measuring unit 180 has the same configuration, respectively, and repeated description thereof will be omitted.

On the other hand, the branch duct monitoring system 290, as shown in Figure 9, the suspended particulates detection unit 270 for the branch duct and the residual particulates and residual ozone detected by the residual ozone measurement unit 280 for the branch duct. Branch duct cleanliness display unit 291 for indicating the degree of cleanliness by displaying information about, the branch duct warning unit 292 for generating a warning signal when the detected amount of suspended particulates and residual ozone exceeds the set reference value, and In response to the signals detected by the particle detection unit 270 and the residual ozone measurement unit 280, the branch duct cleanliness display unit 291 and the branch duct warning unit 292 are controlled to control the opening and closing of the damper 220. The control unit 293 is provided.

As described above, if the circulating air is partially exhausted, the load of suspended particulates and harmful gas components in the circulating air is reduced to prevent accumulation, thereby maintaining the safety of the biohazard of the higher circulating air and extending the life of the filtration element. can do.

As mentioned above, although this invention was demonstrated by the limited embodiment and drawing, this invention is not limited by this, The person of ordinary skill in the art to which this invention belongs, Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

According to the biohazard safety cabinet according to the embodiment of the present invention as described above has the following effects.

First, the biohazard material generated in the work space within the biohazard safety cabinet and the microorganisms remaining after sterilization and residual ozone are sensed in real time, thereby minimizing problems caused by spillage to the work space, various equipment parts, and workers.

Second, since the high efficiency electrostatic filter and the slim type high efficiency filtration filter are used in combination to purify the suspended particulates in the circulation air stream, the pressure loss, noise, and maintenance power cost can be minimized, and the semipermanent life can be achieved.

Third, it supplements the shortcomings of the catalytic gas purification technology, which has a problem in the processing speed for the purification of gaseous harmful substances in the circulating air, and the physical and chemical gas adsorption filter technology, which has problems in its lifetime. By applying UV complex catalyst gas purification technology, it has high efficiency purification ability and semi-permanent life corresponding to airflow speed, and it can minimize the generation of unwanted by-products.

Fourth, automatic control is possible by configuring both real-time detection and cleanliness maintaining technology as an electrical system.

Claims (26)

A blower for generating a circulation airflow; A cabinet housing in which a work space is formed at an inner side of the work door so as to be opened and closed by a work door, and the cabinet housing into which the circulation air generated by the blower flows in and out; A circulation duct forming a circulation passage so that the circulation airflow discharged from the cabinet housing can be introduced back into the cabinet housing; A pretreatment filter installed at an inlet side of the circulation airflow in the cabinet housing; Including a plasma generator for generating a low-temperature plasma downstream of the pretreatment filter in the flow of the circulating air, high efficiency to remove the suspended particulates contained in the circulating air attached to the electrode by the charging and diffusion phenomena due to the low temperature plasma An electrostatic filter; A UV composite photocatalyst for sterilizing biohazard suspended particulates contained in the circulation stream and removing harmful gases using a photocatalyst activated through UV downstream of the high efficiency electrostatic filtration filter in a flow stream of the circulation stream; A sterilizing active material generating device for sterilizing biohazard suspended particulates using a sterilizing active material generated by the low temperature plasma discharge of the sterilizing plasma generating unit downstream of the UV composite photocatalyst in the flow of circulating air; And A biohazard safety cabinet comprising a slim high efficiency filtration filter for filtering suspended particulates downstream of the sterilizing active substance generating device in the flow of circulating air. The method of claim 1, In front of the cabinet housing, a worker's hand is inserted to access the work object while the work door is closed so that the circulation airflow of the work space can not flow out. Biohazard safety cabinet further comprises a glove formed with a hand receiving portion. The method of claim 1, Biohazard safety cabinet further comprises a monitoring system for real-time to detect the suspended particulates and residual ozone present in the circulation air flow by providing a suspended particulate detection unit and residual ozone measuring unit in the working space of the cabinet housing. The method of claim 3, wherein the suspended particulate detection unit, A charging device for charging the suspended particulates in the circulation airflow, Front and rear ion traps installed at the front and rear of the charging device to remove ions, respectively; An impactor of one or multiple stages in which the suspended particulates charged by the charging device collide through the nozzles; Biohazard safety cabinet comprising a microammeter for detecting the current generated by the suspended particles impact the impactor. The method of claim 3, wherein the monitoring system, Cleanliness display unit for displaying the cleanliness of the detected suspended particulates and residual ozone, A warning unit for generating a warning signal when the detected amount of suspended particulates and residual ozone exceeds a set reference value; And a control unit for controlling the cleanliness display unit and the warning unit in response to the signals detected by the suspended particulate detection unit and the residual ozone measurement unit, and controlling the opening and closing of the work door of the cabinet housing. The method of claim 1, The pretreatment filter has antibacterial, biohazard safety cabinet, characterized in that using any one selected from antibacterial plastic, catechin, chitosan and nano metals. The method of claim 1, Biohazard safety cabinet, characterized in that at least one of the pair of electrodes spaced apart from the electrostatic plasma generating unit of the high efficiency electrostatic filtration filter uses a porous conductor formed of a mesh or a porous plate. The method of claim 1, Biohazard safety cabinet, characterized in that at least one of the pair of electrodes spaced apart from the electrostatic plasma generating unit of the high efficiency electrostatic filter is coated with a dielectric. The method of claim 1, The power supply applied to the discharge electrode of the plasma generating unit of the high-efficiency electrostatic filtration filter is any one of a variable DC power supply, a DC pulse type power supply, or an AC power supply connected to a function generator. The method of claim 1, The electrode of the plasma generating unit of the electrostatic filtration filter of the high efficiency electrostatic filtration filter is any one of copper (Cu), iron (Fe), silver (Ag), gold (Au), aluminum (Al), tungsten (W). Biohazard safety cabinet made with. The method of claim 1, The photocatalyst filter of the UV composite photocatalyst unit, biohazard safety cabinet, characterized in that at least one selected from metals, metal oxides, semiconductors, semiconductor oxides, activated carbon, zeolites, silica gel and ceramics to be used as a catalyst carrier. The method of claim 1, The photocatalyst filter of the UV composite photocatalyst unit is a biohazard safety cabinet, wherein the carrier surface of the photocatalyst is selected and coated among metal, metal oxide, semiconductor, semiconductor oxide, activated carbon, zeolite, silica gel and ceramic catalyst. The method of claim 1, Ultraviolet (UV) irradiated to the photocatalyst is a biohazard safety cabinet, characterized in that the wavelength range of 300nm to 400nm UV-A type. The method of claim 13, The light source for irradiating UV to the photocatalyst, biohazard safety cabinet, characterized in that using one of a UV LED (Light-Emitting Display), a cold cathode lamp and a heat tube type UV lamp. The method of claim 1, At least one of the pair of electrodes spaced apart from the sterilizing plasma generating unit of the sterilizing active material generating device is a pin, a plate wire, a cylinder, and a mesh plate. Biohazard safety cabinet, characterized in that the conductor having a shape selected from. The method of claim 1, Biohazard safety cabinet, characterized in that at least one of the pair of electrodes spaced apart from the sterilizing plasma generating unit of the sterilizing active material generator is coated with a dielectric. The method of claim 1, Biohazard safety cabinet, characterized in that the power applied to the discharge electrode of the sterilizing plasma generating unit of the sterilizing active material generating device uses any one of a variable DC power supply, DC pulse type power supply or AC power connected to the function generator. The method of claim 1, The slim high efficiency filtration filter is a biohazard safety cabinet, characterized in that using one of the HEPA, ULPA and e-HEPA filtration medium electrostatic. The method according to any one of claims 1 to 18, The biohazard safety cabinet further comprises a branching duct branched from the circulation duct to form a branch passage through which part of the circulation air is discharged to the outside. The method of claim 19, Biohazard safety cabinet, characterized in that the damper is installed at the branching point of the circulation duct and the branch duct to control the amount of discharged air discharged. The method of claim 19, In the branch duct sequentially in accordance with the flow of the discharge air flow, A sterilizing active material generator for branch ducts for sterilizing biohazard suspended particulates using a sterilizing active material generated by low temperature plasma discharge of the sterilizing plasma generating unit; A high-efficiency electrostatic filtration filter for branch ducts, including a plasma generating unit for generating a low-temperature plasma so that the suspended particulates contained in the circulation air are attached to the electrodes by charging and diffusion due to low-temperature plasma; UV composite photocatalyst for branch duct to sterilize biohazard suspended particulates contained in the circulation stream and remove harmful gas by using photocatalyst activated through ultraviolet rays (UV), Biohazard safety cabinet characterized in that a slim type high efficiency filtration filter for branch duct is installed to filter suspended particulates. The method of claim 21, Branch ducts are provided in real time to detect suspended particulates and residual ozone in the exhaust stream in real time by providing the floating particulate detection unit for branch ducts and the residual ozone measuring unit for branch ducts downstream of the slim type high efficiency filtration filter for branch ducts. Biohazard safety cabinet further comprising a monitoring system. 23. The method of claim 22, wherein the branch duct suspended particulate detection unit, A charging device for charging the suspended particulates in the exhaust stream, Front and rear ion traps installed at the front and rear of the charging device to remove ions, respectively; An impactor of one or multiple stages in which the suspended particulates charged by the charging device collide through the nozzles; Biohazard safety cabinet comprising a microammeter for detecting the current generated by the suspended particles impact the impactor. The method of claim 22, wherein the monitoring system for the discharge air flow, Cleanliness display unit for displaying the cleanliness of the detected suspended particulates and residual ozone, A warning unit for generating a warning signal when the detected amount of suspended particulates and residual ozone exceeds a set reference value; And a control unit controlling the cleanliness display unit and the warning and controlling the opening and closing of the damper in response to the signals detected by the suspended particulate detection unit and the residual ozone measurement unit. A method of controlling the operation of the biohazard safety cabinet according to claim 1, In a work mode in which a worker performs a work on a work object in a work space, the electric power is cut off by the discharge electrode of the sterilizing plasma generating unit of the sterilizing active material generating device. The operation control method of the biohazard safety cabinet, characterized in that for supplying power to the discharge electrode of the electrostatic plasma generating unit of the high efficiency electrostatic filtration filter. A method of controlling the operation of the biohazard safety cabinet according to claim 1, In the sterilization mode in which the work door is closed and sterilization is performed in a closed state, power is supplied to the discharge electrode of the plasma generation unit for sterilization of the sterilization active material generator. The operation control method of the biohazard safety cabinet, characterized in that the power supply is cut off to the discharge electrode of the electrostatic plasma generating unit of the high efficiency electrostatic filtration filter.

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