KR102128654B1 - Air conditioning system of negative pressure type special facility - Google Patents

Abstract

The air conditioning system of the disclosed negative pressure type special facility is provided with an air supply and an exhaust port in each room consisting of a locker room, a shower room, a waiting room, and a laboratory, wherein each air supply and air conditioner are connected through a main air supply pipe to Air is supplied to each chamber through the air supply mechanism by driving, and each of the exhaust ports and the exhaust fan motor are connected through a main exhaust pipe, so that the air of each chamber is exhausted by driving the exhaust fan motor. In the air conditioning system of a negative pressure type special facility that maintains a negative pressure state between each of the threads, and forms a differential pressure between each of the threads, the branch pipe for supply air connecting the main air supply pipe and each of the air supply ports A motor damper for supplying air is installed on the air, and a motor damper for exhaust is installed on a branch pipe for exhaust connecting the main exhaust pipe and each of the exhaust ports, and the motor damper for exhaust is fixed to fix the opening degree. It is driven by a constant air volume control method, and the motor damper for supplying air is configured to be driven by a variable air volume control method, and a pressure measurement line connected to each chamber and an atmospheric pipe connected to an external atmosphere. A pressure measurement sensor is installed to connect a line, and measures the absolute differential pressure value of each chamber against atmospheric pressure through the pressure measuring sensor, and the differential pressure between the chambers is maintained constant according to the measured absolute differential pressure value. It is characterized by controlling the opening ratio of the motor damper for supply air.

Description

Air conditioning system of sound pressure type special facilities {AIR CONDITIONING SYSTEM OF NEGATIVE PRESSURE TYPE SPECIAL FACILITY}

The present invention relates to an air conditioning system for a negative pressure type special facility, and more specifically, biosafety class-3 (BSL) for performing diagnosis, storage, and experiment of pathogenic microorganisms and viruses that are transmitted through air as a medium or whose propagation factors are unknown. -3) It relates to the air conditioning system applied to special facilities of negative pressure type such as laboratory.

A negative (-) pressure special facility refers to a facility that prevents external leakage of risk factors that can cause serious dangers when propagating outside.

Since 1983, WHO and many countries have established risk groups according to the risk of pathogenic microorganisms [Risk Group-1, Risk Group-2, Risk Group-3, Risk Group-4] in order to safely handle and conduct research on pathogenic microorganisms. It was divided into 4 stages, and established a biosafety grade standard suitable for each grade, [BSL-1, BSL-2, BSL-3, BSL-4]. (Risk Group, Bio Safety Level)

Among them, the [BSL-3, BSL-4] laboratory is the highest prevention facility, and is a laboratory that conducts diagnosis, storage, and testing of pathogenic microorganisms and viruses whose air is transmitted through a medium or whose propagation factors are unknown.

The air pollution prevention facilities in the biosafety level 3 and 4 laboratories mentioned above adopt a filter method, which collects the polluted bacteria and pathogenic microorganisms emitted from the room with the HEPA filter, and is a relatively simple air pollution prevention facility that prevents external exposure of pathogenic microorganisms. Although it can be recognized as, DUCT, HEPA FILTER BOX, laboratory sealing, etc. require high technology and must comply with strict quality regulations.

In particular, laboratory air conditioning equipment (air conditioning equipment) operates 24 hours a day, and maintains a negative pressure at a certain differential pressure during operation to prevent external transmission of pathogenic microorganisms and contaminated bacteria and to create a perfect research environment. GOOD MICRO-BIOLOGICLA TECHNIQUES [GMT] High air conditioning techniques are required because activities (eg ventilation frequency, temperature/humidity) must be observed.

1 and 2, the air conditioning system of the negative pressure type special facility applied to the existing biosafety class 3 laboratory is provided in a locker room (R1), a shower room (R2), a waiting room (R3), and a laboratory (R4). Each air supply 11 and an exhaust port 21 are installed, and each air supply 11 is connected to the air conditioner 17 through the main air supply pipe 13 and the branch pipe 13a for supplying air conditioners 17 Air is configured to be supplied to each chamber (R1, R2, R3, R4) through each air supply mechanism (11) by driving, and each exhaust port (21) includes a main exhaust pipe (23) and a branch pipe for exhaust ( It is connected to the exhaust fan motor 27 through 23a) and is configured to exhaust the air in each chamber R1, R2, R3, R4 by driving the exhaust fan motor 27, and through each supply mechanism 11 The supplied supply air volume is made smaller than the exhaust air volume discharged through each exhaust port 21 so that negative (-) pressure is formed in each chamber R1, R2, R3, R4.

Each supply branch pipe (13a) is provided with a motor damper (15) for supply air, and each branch pipe (23a) for exhaust is provided with a motor damper for exhaust (25), and the supply air motor damper (15) is opened. The constant air volume (CAV-Constant Air Volume) control method is applied, and the exhaust motor damper 25 is applied with a variable air volume (VAV-Variable Air Volume) control method.

The HEPA filter 14 is installed at the downstream side of the supply air motor damper 15, and the HEPA filter 24a is provided at the downstream side of the exhaust motor damper 25 on the exhaust branch pipe 23a. It is configured to be installed, and purified air is supplied to each chamber (R1, R2, R3, R4), and contaminants such as viruses and bacteria are external to the exhaust air from each chamber (R1, R2, R3, R4). It is filtered to prevent exhaustion.

In addition, the negative pressure of each of the seals R1, R2, R3, and R4 should be such that a differential pressure is formed, and for this purpose, pressure measuring lines 29a and 29b are installed in two neighboring seals, respectively, A pressure measurement sensor 28 is installed to be connected to the measurement lines 29a, 29b to detect the differential pressure of two neighboring chambers through the pressure measurement sensor 28, and the motor damper for exhausting according to the detected differential pressure ( By controlling the opening degree of 25), the locker room R1 is -40PA, the shower room R2 is -30PA, the waiting room R3 is -20PA, and the laboratory R4 is -10PA.

However, the air conditioning system of such a conventional sound pressure type special facility has a difficulty in maintaining a differential pressure between rooms, and there is a problem in that an external exposure accident occurs due to reversal of pressure between the threads because the pressure difference due to movement of the copper wire affects the entire chamber. .

In addition, it is difficult to cope with fluctuating loads such as air-pole clogging and indoor air infiltration of the HEPA filter generated in the air conditioning system, and it is necessary to exhaust the exhaust fan motor by adding the amount of air blown to the ventilation frequency. The capacity had to be unnecessarily large, and there was a problem in that it was impossible to control the total air volume. In addition, there is a problem in that the displacement control is complicated because the displacement of the entire chamber must be changed by the moving line between threads.

On the other hand, in order to compensate for the disadvantages of the air conditioning system of the conventional sound pressure type special facility, the automatic control of the air conditioning system is excluded and all of the supply air motor dampers and exhaust motors through TAB (Testing Adjusting Blancing) VFD (Variable-Frequency Drives) air-conditioning control method that controls the differential pressure and air flow amount by fixing the opening rate of the damper and fixing the inverter Hz value of the supply/exhaust fan is also applied, but this VFD air conditioning control method In the case, the periodic test adjustment evaluation and monitoring of the air flow rate were performed, and in the case of an operating laboratory, it was possible to consider the laboratory schedule and work after the sterilization of the laboratory, so there was a problem that a lot of complexity was derived from the air conditioning test adjustment evaluation.

On the other hand, as shown in Fig. 2, as shown in Fig. 2, various main air supply pipes 13, branch pipes 13a for supplying air, main exhaust pipes 23, branch pipes 23a for exhausting, and motor dampers for supplying air ( 15), a duct installation space (also referred to as'CAT-WALK FLOOR') in which components such as a motor damper 25 for exhaust, a pressure measurement line 29a, 29b, and a pressure measurement sensor 28 are installed.

An unexplained reference numeral R6 denotes a machine room (referred to as an AHU (Air Handling Unit) room) in which an air conditioner 17 and an exhaust fan motor 27 are installed.

The present invention was devised to solve the conventional problems as described above, and the air conditioning system of a negative pressure type special facility capable of effectively preventing the differential pressure reversal between the threads by preventing the differential pressure change according to the moving line from affecting the entire chamber. Purpose to provide.

In addition, the present invention is intended to provide an air conditioning system of a sound pressure type special facility having an improved form so that the response to load fluctuation of the air flow rate is fast and the indoor differential pressure can be changed without a separate test adjustment evaluation (TAB). There is this.

In order to achieve the above object, the air conditioning system of the negative pressure type special facility of the present invention is provided with an air supply and an exhaust port in each room consisting of a locker room, a shower room, a waiting room, and a laboratory, and each air supply and air conditioner is main It is connected through an air supply pipe and air is supplied to each chamber through the air supply by driving of the air conditioner, and each of the exhaust ports and the exhaust fan motor is connected through the main exhaust pipe to be driven by the drive of the exhaust fan motor. In the air conditioning system of a negative pressure type special facility that is configured to exhaust the air of each chamber, each chamber maintains a negative pressure state, a differential pressure is formed between the chambers, the main air supply pipe and the respective A motor damper for supplying air is installed on a branch pipe for supplying air that connects an air supply, and a motor damper for exhausting is installed on a branching pipe for exhaust that connects the main exhaust pipe and each of the exhaust ports. The motor damper is driven by a constant air volume control method that fixes the opening rate, and the motor damper for supplying air is configured to be driven by a variable air volume control method, and the pressure measurement connected to each chamber is measured. A pressure measuring sensor is installed to connect the line and the atmospheric piping line connected to the outside atmosphere, and measures the absolute differential pressure value of each chamber against atmospheric pressure through the pressure measuring sensor, and each chamber according to the measured absolute differential pressure value. It is characterized in that the opening rate of the motor damper for supplying air is controlled to maintain a constant pressure difference therebetween.

In order to maintain a constant amount of supply air supplied to the motor damper for air supply from the air conditioner through the main air supply pipe, an air pressure detector for measuring air pressure values is installed in the main air supply pipe, and through the air pressure detector According to the detected air pressure value of the main air supply pipe, the air pressure in the main air supply pipe is fixed by adjusting the opening ratio of the first proportional control motor damper on the air discharge duct installed to discharge a part of the air from the main air supply pipe to the outside. It can be configured to maintain.

A second proportional control on the air intake duct installed to intake external air into the main exhaust pipe according to the air flow detection value detected through the air flow detector by installing an air flow detector to detect the air flow in the main exhaust pipe Controlling the motor damper may be configured to maintain a constant amount of exhaust air discharged through the exhaust fan motor.

A HEPA filter for supplying air is installed in the branch pipe for supplying air, and the HEPA filter for supplying air is configured to be installed on the downstream side of the motor damper for supplying air, and an HEPA filter for exhausting is installed at the exhaust port, and It can be configured to be located on the current side.

According to the above, according to the present invention, unlike the existing system, the air conditioning system is applied with a constant air volume (CAV) control method for fixing the opening rate of the motor damper for exhaust, and the damper for supplying air varies the opening rate. The variable air volume (VAV) control method is applied, and the motor damper for each air supply is controlled by the variable air volume (VAV) method by measuring the absolute differential pressure between each room and the atmosphere, rather than the existing method of measuring the relative differential pressure between rooms. As a way to keep this constant, it is possible to prevent reversal of the differential pressure between the threads because the change in the differential pressure according to the movement line between each thread does not affect the entire chamber, thereby preventing the accident of external exposure of the actual air due to the reversing of the differential pressure between the threads. It is possible to improve the safety of the sound pressure type special equipment.

In addition, it is possible to keep the supply air supply volume supplied from the air conditioner to the motor damper for supplying air through the main air supply pipe by a simple structure. In addition, when controlling the air flow rate of the motor damper for exhaust, it can also be used for external factors such as crevices. Nevertheless, since the overall amount of exhaust air discharged through the exhaust fan motor can be kept constant by a simple structure, it is easy to operate and manage and has an effect of reducing energy consumption for operation.

1 is a diagram representing the layout and differential pressure system diagram of a sound pressure type special facility based on the biosafety level 3 laboratory standard,
2 is a diagram showing a system diagram of an air conditioning system of a conventional sound pressure type special facility,
3 is a system diagram of an air conditioning system of a special facility for a negative pressure type according to an embodiment of the present invention.

The above objects, other objects, features and advantages of the present invention will be readily understood through the following preferred embodiments related to the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided to ensure that the disclosed contents are thorough and complete and that the spirit of the present invention is sufficiently conveyed to those skilled in the art.

In this specification, when a component is referred to as being on another component, it means that it may be formed directly on another component, or a third component may be interposed between them. In addition, in the drawings, the thickness of the components is exaggerated for effective description of the technical content.

The terminology used herein is for describing the embodiments, and is not intended to limit the present invention. In the present specification, the singular form also includes the plural form unless otherwise specified in the phrase. As used herein,'comprises' and/or'comprising' does not exclude the presence or addition of one or more other components.

In describing the following specific embodiments, various specific contents have been prepared to more specifically describe and understand the invention. However, a reader with knowledge in this field to the extent that the present invention can be understood can recognize that these various specific contents can be used without them. It should be noted that, in some cases, parts that are commonly known in describing the invention and which are not significantly related to the invention are not described in order to prevent chaos from coming into account in explaining the present invention.

Hereinafter, an air conditioning system of a negative pressure type special facility according to an embodiment of the present invention will be described with reference to FIG. 3.

The air conditioning system of the negative pressure type special facility of the present invention is an air conditioning system applied to a biosafety class 3 laboratory, and is respectively supplied to a locker room (R1), a shower room (R2), a waiting room (R3), and a laboratory (R4). (41) and the exhaust port (61) is installed, each air supply (41) is connected to the air conditioner (48) through the main air supply pipe (43) and the air supply branch pipe (43a) to drive the air conditioner (48) Air is configured to be supplied to each chamber R1, R2, R3, and R4 through each air supply mechanism 41, and each exhaust port 61 includes a main exhaust pipe 63 and a branch pipe 63a for exhaust. It is connected to the exhaust fan motor 67 through and is configured to exhaust air of each chamber R1, R2, R3, R4 by driving the exhaust fan motor 67.

In the air conditioning system of the present invention, the amount of supply air blown through each air supply port 41 is smaller than the amount of air blown out through each air outlet 61, so that the air in each room R1, R2, R3, R4 is negative ( -) Make pressure build up.

A motor damper 44 for supplying air is installed in each branch pipe 43a for supplying air, and a motor damper 65 for exhausting is installed in each branching pipe 43a for exhausting, and motor damper 65 for exhausting in the present invention Is driven by a constant air volume (CAV-Constant Air Volume) control method that maintains a constant opening degree, and the supply air motor damper 44 is configured to be driven by a variable air volume (VAV-Variable Air Volume) control method that changes the opening rate. do.

In the present invention, unlike the conventional, the motor damper for exhaust 65 is driven by a constant air volume control method, and the exhaust air flow rate from each room is kept constant, while the air supply motor damper 44 is controlled by a variable air volume control method. A method of driving and adjusting the amount of supply air supplied to each room is applied.

In addition, the present invention is configured to be installed on the downstream side of the air supply HEPA filter 42 is installed in each supply branch pipe (43a), the supply air motor damper 44, the exhaust HEPA filter 62 is an exhaust port It is installed on the (61), it is configured to be located on the current side of the motor damper for exhaust (65).

As described above, the air pressure direction motor damper 44 may be located behind the HEPA filter 42 for air supply in the air flow direction to facilitate the duct sealing test of the actual pressure and HEPA filter-diffuser section, and the motor damper for exhaust 65 By being located in front of the HEPA filter 62 for exhaust in the air direction, the hermetic test of the laboratory R4 can be facilitated.

In the present invention, the motor damper for air supply 44 is driven by a variable air volume control method, wherein each air supply motor damper 44 measures the differential pressure between each chamber (R4, R3, R2, R1) and the atmosphere, , Through the measured differential pressure, the variable air volume can be controlled so that the differential pressure between each room is maintained.

Specifically, the atmospheric pipe line 47 connected to the external atmosphere is installed in the duct installation space R5, and the pressure measurement line 46 connected to each room R1, R2, R3, R4 is installed, and the atmosphere It is configured to install a pressure measuring sensor (45) connecting the branch pipe (47a) of the pipe line (47) and each pressure measuring line (46), through each pressure measuring sensor (45) of each room compared to atmospheric pressure It is configured to measure absolute differential pressure.

Each pressure measurement sensor 45 is electrically connected to each supply air motor damper 44, and each supply air motor damper 44 is absolute in each room compared to atmospheric pressure measured through the pressure measurement sensor 45 The variable air volume is controlled so that the opening rate of each air supply motor damper 44 is adjusted based on the differential pressure value, and thus can be configured to maintain the differential pressure between the respective threads.

That is, by controlling the opening rate of each air supply motor damper 44 to be adjusted based on the absolute differential pressure of each chamber compared to the atmospheric pressure measured by each pressure measuring sensor 45, the differential pressure between each chamber, the locker chamber ( R1) is -40PA, -30PA in the shower room (R2), -20PA in the waiting room (R3), and -10PA in the laboratory (R4) can be maintained.

On the other hand, in the present invention, the sound pressure of each room is maintained by a variable air volume control method that adjusts the opening degree of the motor damper 44 for supplying air. At this time, the air supply from the air conditioner 17 is reflected by reflecting the unknowns of the gap wind. In order to maintain a constant supply air supply amount supplied to the motor damper 44, the air discharge duct 51 is connected to the main air supply pipe 43 in the machine room R6, and the air discharge duct 51 is firstly connected to the air discharge duct 51. A proportional control motor damper (53) is installed, and an air pressure detector (49) capable of measuring the pressure in the main air supply pipe (43) is installed on the main air supply pipe (43), and the air pressure detector (49) Supply supplied to the motor damper 44 for each air supply by maintaining the air pressure in the main air supply pipe 43 by controlling the first proportional control motor damper 53 by the first controller 55 according to the detected value The amount of air blowing can be made constant.

Specifically, when the air pressure of the main air supply pipe 43 detected through the air pressure detector 49 increases, the first controller 55 increases the opening ratio of the first proportional control motor damper 53 By controlling, the amount of air discharged to the outside from the air in the main air supply pipe 43 through the air discharge duct 51 is increased to maintain a constant air pressure in the main air supply pipe 43 to maintain the main air supply pipe 43 ), it is possible to maintain a constant amount of supply air supplied to the motor damper 44 for each air supply.

On the other hand, when the air pressure of the main air supply pipe 43 detected through the air pressure detector 49 decreases, the first controller 55 controls to reduce the opening ratio of the first proportional control motor damper 53 By doing so, the amount of air discharged to the outside from the air in the main air supply pipe 43 through the air discharge duct 51 is reduced, thereby maintaining the air pressure in the main air supply pipe 43 constant to maintain the main air supply pipe 43 Through it, it is possible to maintain a constant amount of supply air supplied to the motor damper 44 for each air supply.

In addition, in the present invention, the motor damper for exhaust 65 is driven by a constant air volume (CAV) control method for fixing the opening rate, and at this time, the exhaust air flow rate may not be constant due to a clearance wind such as real time. To the machine room (R6), an air intake duct (71) capable of inhaling external air is connected to the main exhaust pipe (63), and a second proportional control motor damper (73) is installed on the air intake duct (71). Installed, and installed on the main exhaust pipe (63) to install an air flow detector (68, Air Flow Indicator) capable of measuring the amount of exhaust air flow, the second controller according to the detected value in the air flow detector (68) ( 75) may control the second proportional control motor damper 73 to maintain a constant amount of exhaust air flow through the exhaust fan motor 67.

Specifically, when the amount of exhaust air flow detected through the air flow rate detector 68 increases, the second controller 75 controls the air intake duct () by increasing the opening ratio of the second proportional control motor damper 73. 71) to increase the amount of external air supplied to the main exhaust pipe (63), thereby reducing the amount of exhaust air flowing in the main exhaust pipe (63) toward the exhaust fan motor (67), thereby reducing the exhaust fan motor (67). ), it is possible to maintain a constant amount of exhaust ventilation. On the other hand, when the amount of exhaust air flow detected through the air flow rate detector 68 decreases, the second controller 75 controls the opening ratio of the second proportional control motor damper 73 to decrease, thereby allowing the air intake duct 71 ) To reduce the amount of external air supplied to the main exhaust pipe (63), thereby increasing the amount of exhaust air flowing in the main exhaust pipe (63) toward the exhaust fan motor (67). Through it, it is possible to maintain a constant amount of exhaust ventilation.

As described above, unlike the existing system, the air conditioning system of the present invention is applied with a constant air volume (CAV) control method for fixing the opening rate of the motor damper 65 for exhaust, and the opening rate of the motor damper 44 for supplying air. The variable air volume (VAV) control method is applied, and the motor damper for each air supply is measured by measuring the absolute differential pressure between each room (R1, R2, R3, R4) and the atmosphere, rather than the existing method of measuring the relative differential pressure between rooms. ) Is controlled by a variable air volume (VAV) method, so that the differential pressure between each chamber is kept constant. Since the differential pressure change according to the movement line between each chamber does not affect the entire chamber, it is possible to effectively prevent the differential pressure reversal between chambers. There is a characteristic.

In addition, the present invention, in order to maintain a constant supply air supply volume supplied to the motor damper 44 for supplying air from the air conditioner 48 through the main air supply pipe 43, the air pressure detector 49 to the main air supply pipe 43 By installing the, the air pressure in the main air supply pipe (43) is detected, and according to the detected air pressure, a part of the air in the main air supply pipe (43) is discharged to the outside by controlling the first proportional control motor damper (53). In this way, the air pressure in the main air supply pipe (43) is kept constant, and accordingly, the amount of supply air supplied to the motor damper (44) for each air supply can be kept constant. It is possible to keep the control constant, so it can reduce energy consumption according to equipment operation, and has a feature that can reduce operating noise compared to the self-control method of the air conditioner (48).

In addition, according to the present invention, when controlling the constant air volume (CAV) for fixing the opening degree of the motor damper 65 for exhaust, a variable may occur in the amount of exhaust air exhausted to the outside through the main exhaust pipe 63 due to a gap wind, etc. However, the present invention is to install the air flow detector (68) in the main exhaust pipe (63) to detect the air flow rate through the main exhaust pipe (63), and the second proportional control motor damper according to the detected air flow rate By controlling the (73) to allow external air to be sucked into the main exhaust pipe (63), it is possible to maintain a constant amount of exhaust air discharged through the exhaust fan motor (67), thereby allowing easy exhaust by a simple structure. It is possible to control the amount of airflow, thereby reducing energy consumption according to equipment operation, and it has a feature that can reduce operating noise compared to the control method of the exhaust fan motor 67 itself.

Above, the present invention has been illustrated and described with reference to preferred embodiments for illustrating the principles of the invention, but the invention is not limited to the configurations and acts as illustrated and described. Rather, those skilled in the art will appreciate that many changes and modifications to the present invention are possible without departing from the spirit and scope of the appended claims. Accordingly, all such suitable modifications and corrections and equivalents should also be considered within the scope of the present invention.

41...Air supply
42...HAPA filter for air supply
43...Main supply piping
44... Motor damper for air supply
47...atmospheric piping line
48...air conditioner
49...air pressure detector
51...air release duct
53...first proportional control motor damper
55...first controller
61...Vent
62...HAPA filter for exhaust
63...Main exhaust piping
65... motor damper for exhaust
67...exhaust fan motor
68...air flow detector
71...air intake duct
73...2 proportional control motor damper
75...second controller

Claims (4)

Air supply and exhaust are installed in each room consisting of a locker room, a shower room, a waiting room, and a laboratory, and each of the air supply and air conditioners is connected through a main air supply pipe so that air is driven through the air supply by driving of the air conditioner. It is supplied to each of the seals, and each of the exhaust ports and the exhaust fan motor are connected through a main exhaust pipe to be configured to exhaust air of each seal by driving the exhaust fan motor, so that each seal maintains a negative pressure state. However, in the air conditioning system of a negative pressure type special facility to create a differential pressure between each room,
A motor damper for supplying air is provided on a branch pipe for supplying air connecting the main air supply pipe and each of the air supplying pipes, and a motor damper for exhausting is provided on a branch pipe for exhaust connecting the main exhaust pipe and the respective exhaust ports. Configured to be installed,
The motor damper for exhaust is driven by a constant air volume control method that fixes the opening rate, and the motor damper for air supply is configured to be driven by a variable air volume control method,
A pressure measuring sensor is installed to connect a pressure measuring line connected to each chamber and an atmospheric piping line connected to an external atmosphere, and the absolute differential pressure value of each chamber is measured by comparing the atmospheric pressure with the pressure measuring sensor. It is to control the opening degree of the motor damper for supplying air so that the differential pressure between the chambers is kept constant according to the absolute differential pressure value,
In order to maintain a constant amount of supply air supplied to the motor damper for air supply from the air conditioner through the main air supply pipe, an air pressure detector for measuring air pressure values is installed in the main air supply pipe, and through the air pressure detector According to the detected air pressure value of the main air supply pipe, the air pressure in the main air supply pipe is fixed by adjusting the opening ratio of the first proportional control motor damper on the air discharge duct installed to discharge a part of the air from the main air supply pipe to the outside. And keep it
A second proportional control on the air intake duct installed to install external air flow detectors to detect the air flow in the main exhaust pipe and intake external air into the main exhaust pipe according to the air flow detection value detected through the air flow detector Air conditioning system of a negative pressure type special facility, characterized in that it is configured to control the motor damper so that the amount of exhaust air discharged through the exhaust fan motor is kept constant.
delete delete According to claim 1,
A HEPA filter for supplying air is installed in the branch pipe for supplying air, and the HEPA filter for supplying air is configured to be installed on the downstream side of the motor damper for supplying air.
The HEPA filter for exhaust is installed in the exhaust port and is configured to be located on the current side of the exhaust motor damper.

Images