An online monitoring system and method for air tightness of a high air tightness room

Abstract

The application discloses an air tightness online monitoring system and method for a high air tightness room, and belongs to the air tightness monitoring field. The air tightness online monitoring system comprises a differential pressure sensor arranged on a wall of a monitored room, an air inlet channel and an air outlet channel. An air inlet sealing valve and an air inlet air volume monitoring device are arranged on the air inlet channel. An air outlet air volume monitoring device and an air outlet sealing valve are arranged on the air outlet channel. A test channel is further arranged on the air outlet channel between the air outlet air volume monitoring device and the air outlet sealing valve. A test sealing valve and a test fan are arranged on the test channel. The application can not only realize online monitoring of the air tightness of the room, but also realize continuous real-time monitoring in a periodical and long-term mode, greatly improves the air tightness monitoring efficiency, meets the monitoring requirements of the high air tightness room, and overcomes the problems of the existing air tightness monitoring, such as the deficiency and the ineffective backtracking. The air tightness online monitoring method is various, flexible, stable and reliable, and meets different requirements of the air tightness monitoring.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air tightness online monitoring, in particular to an air tightness online monitoring system and method for a high air tightness room. BACKGROUND

[0002] The biosafety level four laboratory and the large animal level three laboratory need to operate high biological risk factors, so the air tightness of the enclosure structure is strictly required. According to the provisions of the standard regulations of China, the biosafety level four laboratory needs to meet the requirement that the decay pressure is not greater than 250 Pa within 20 min under the initial pressure of 500 Pa, and the large animal level three biosafety laboratory needs to meet the requirement that the leakage amount is not greater than 10% of the laboratory test volume under the pressure of 250 Pa.

[0003] However, the laboratory air tightness cannot be monitored online at present, and only annual inspection can be carried out, so that the performance aging of the sealing component of the enclosure structure cannot be grasped in real time, and once the air tightness is found to be unqualified in the annual monitoring, the time during which the laboratory has been working under unqualified conditions cannot be effectively traced back.

[0004] Therefore, the existing air tightness monitoring device still has disadvantages in structure, method and use, and needs to be further improved. How to create a new air tightness online monitoring system and method for a high air tightness room, so that the air tightness of the room can be flexibly monitored online, and various modes of air tightness online monitoring can be realized. SUMMARY

[0005] The technical problem to be solved by the present application is to provide an air tightness online monitoring system for a high air tightness room, so that the air tightness of the room can be flexibly monitored online, and various modes of air tightness online monitoring can be realized, which is flexible, stable and reliable, thereby overcoming the shortcomings of the existing air tightness monitoring device.

[0006] To solve the above technical problems, the present application provides an air tightness online monitoring system for a high air tightness room, comprising a differential pressure sensor, an air inlet channel and an air outlet channel arranged on the wall of the monitored room, an air inlet airtight valve and an air inlet air volume monitoring device are arranged on the air inlet channel from outside to inside in sequence, an air outlet air volume monitoring device and an air outlet airtight valve are arranged on the air outlet channel from inside to outside in sequence, and a test channel is further arranged on the air outlet channel between the air outlet air volume monitoring device and the air outlet airtight valve, and a test airtight valve and a test fan are arranged on the test channel.

[0007] Further improvement, an air inlet high efficiency filter is further arranged on the air inlet channel, and an air outlet high efficiency filter is further arranged on the air outlet channel.

[0008] Further improvement, the monitored room is further provided with a temperature sensor.

[0009] Further improvement, the monitored room is further provided with a personnel detection device.

[0010] As another improvement of the present application, the present application further provides an online monitoring method of the air tightness online monitoring system of the high air tightness room, the method comprises an air tightness pressure decay monitoring method, the method is: under the condition that the monitored room is empty, closing the air inlet valve and the air outlet valve, opening the test valve and the test fan, monitoring the negative pressure value in the monitored room by the differential pressure sensor, when the negative pressure value reaches a first preset value, closing the test valve and the test fan, monitoring the negative pressure value collected by the differential pressure sensor in real time, when the negative pressure value decays to a second preset value, starting to record the time synchronously, until a predetermined time length, recording the negative pressure value collected by the differential pressure sensor, comparing the collected negative pressure value with a standard set value, and determining whether the air tightness of the monitored room meets the requirements.

[0011] Further improvement, the personnel detection device arranged in the room is used to monitor whether there is personnel activity in the monitored room and make a judgment.

[0012] Further improvement, the method keeps the temperature of the monitored room stable during monitoring.

[0013] As another improvement of the present application, the present application further provides an online monitoring method of the air tightness online monitoring system of the high air tightness room, the method comprises an air tightness constant pressure monitoring method, the method is: under the condition that the monitored room is empty, closing the air outlet valve, opening the air inlet valve, the test valve and the test fan, adjusting the frequency of the test fan and the valve opening degree of the air inlet valve, so that the negative pressure value in the monitored room remains unchanged, reading the air outlet measurement value of the air outlet flow monitoring device, dividing the obtained hourly air outlet measurement value by the volume of the monitored room, comparing the obtained ratio with a preset standard value, and determining whether the air tightness of the monitored room meets the requirements.

[0014] Further improvement, the personnel detection device arranged in the room is used to monitor whether there is personnel activity in the monitored room and make a judgment, and the time for reading the air outlet measurement value of the air outlet flow monitoring device is not more than 10 minutes.

[0015] As another improvement of the present application, the present application also provides an online monitoring method of the air tightness online monitoring system of the high air tightness room, the method comprising a long-term air tightness monitoring method under normal operation conditions, the method being: under normal operation conditions of the monitored room, closing the test air tightness valve and the test fan, opening the air inlet air tightness valve and the air outlet air tightness valve, maintaining the internal negative pressure value of the monitored room constant, reading the air inlet measurement value and the air outlet measurement value of the air inlet flow monitoring device and the air outlet flow monitoring device, calculating the difference between the air inlet measurement value and the air outlet measurement value, and then calculating the difference value between the air inlet measurement value and the air outlet measurement value under unit pressure difference according to the real-time results collected by the pressure difference sensor, if the difference value exceeds the preset limit value, determining that the air tightness of the monitored room does not meet the requirements, and issuing a warning.

[0016] After adopting such design, the present application has at least the following advantages:

[0017] The air tightness online monitoring system of the high air tightness room can realize online monitoring of the air tightness of the room, and can also realize periodic and long-term continuous real-time monitoring, greatly improving the air tightness monitoring efficiency, meeting the monitoring requirements of the high air tightness room, and overcoming the problems of the existing air tightness monitoring, such as the inability to effectively trace back.

[0018] The air tightness online monitoring method of the high air tightness room can realize periodic monitoring and long-term real-time monitoring, is flexible and stable, and meets different requirements of air tightness monitoring. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, the following will further describe the present application in detail in combination with the drawings and specific embodiments.

[0020] Figure 1 is a structural schematic diagram of the air tightness online monitoring system of the high air tightness room of the present application. DETAILED DESCRIPTION

[0021] The air tightness online monitoring system of the present application is used for high air tightness rooms with strict air tightness requirements, such as biosafety level four laboratories and large animal level three laboratories, and can not only realize online real-time monitoring, but also realize long-term continuous monitoring, greatly improving the air tightness monitoring efficiency, meeting the monitoring requirements of the high air tightness room, and overcoming the problems of the existing air tightness monitoring, such as the inability to effectively trace back. The specific embodiments are as follows.

[0022] Referring to the drawings Figure 1As shown, the air tightness online monitoring system of the high air tightness room in the embodiment comprises a differential pressure sensor 1 arranged on the wall of the monitored room, an air inlet channel and an air outlet channel. The air inlet channel is sequentially provided with an air inlet sealing valve 4, an air inlet air volume monitoring device 3 and an air inlet high efficiency filter 2 from outside to inside. The air outlet channel is sequentially provided with an air outlet high efficiency filter 5, an air outlet air volume monitoring device 6 and an air outlet sealing valve 7 from inside to outside. A test channel is further arranged on the air outlet channel between the air outlet air volume monitoring device 6 and the air outlet sealing valve 7, and the test channel is provided with a test sealing valve 8 and a test fan 9.

[0023] In addition, the monitored room in the embodiment is further provided with a temperature sensor 10 and a personnel detection device 11.

[0024] The air tightness online monitoring method of the air tightness online monitoring system of the high air tightness room comprises an air tightness pressure decay monitoring method, an air tightness constant pressure monitoring method and a long-term air tightness monitoring method.

[0025] The air tightness pressure decay monitoring method comprises the following steps:

[0026] Firstly, the personnel detection device 11 arranged inside the monitored room monitors whether there is personnel activity inside the room. Only under the condition that there is no personnel activity, the following steps are taken.

[0027] The air inlet sealing valve 4 and the air outlet sealing valve 7 are closed, the test sealing valve 8 and the test fan 9 are opened, and the negative pressure value in the monitored room is monitored by the differential pressure sensor 1. When the negative pressure value reaches a first preset value, such as -600 Pa, the test sealing valve 8 and the test fan 9 are closed.

[0028] Then, the negative pressure value collected by the differential pressure sensor 1 is monitored in real time. When the negative pressure value decays to a second preset value, such as -500 Pa, the time is recorded synchronously. Until a predetermined time length, such as 20 min, the negative pressure value collected by the differential pressure sensor 1 at this time is recorded. According to the comparison between the collected negative pressure value and a standard set value, such as -250 Pa, if the collected negative pressure value is higher than -250 Pa, it is determined that the air tightness of the monitored room meets the requirements. If the collected negative pressure value is lower than -250 Pa, it is determined that the air tightness of the monitored room does not meet the requirements. That is, the air tightness online monitoring of the monitored room is realized simply and conveniently. The method can be performed at any time when needed, and the air tightness monitoring efficiency is greatly improved.

[0029] In order to ensure the stability and reliability of the monitoring method, the temperature inside the room is detected by the temperature sensor 10 during the monitoring of the method, so as to keep the temperature of the monitored room constant as much as possible, and improve the reliability of the monitoring result.

[0030] The air tightness constant pressure monitoring method comprises the following steps:

[0031] Similarly, first by the monitored room inside the personnel detection device 11 monitor its room inside the personnel activity, only in the absence of personnel activity conditions, take the following steps;

[0032] Close the exhaust airtight valve 7, open the air intake airtight valve 4, test airtight valve 8 and test fan 9, adjust the test fan 9 frequency and the air intake airtight valve 4 valve opening, the monitored room internal negative pressure value remains unchanged, read the exhaust air flow monitoring device 6 exhaust measurement value, and the resulting hourly exhaust measurement value divided by the monitored room volume, the resulting ratio compared with the preset standard value, determine whether the air tightness of the monitored room meets the requirements. If the resulting hourly exhaust measurement value divided by the monitored room volume ratio is greater than 10%, the air tightness of the monitored room is determined to be unsatisfactory; if the resulting hourly exhaust measurement value divided by the monitored room volume ratio is less than 10%, the air tightness of the monitored room is determined to be satisfactory. Similarly, the air tightness of the monitored room is realized on-line monitoring.

[0033] The method can be performed at any time as needed, greatly improving the air tightness monitoring efficiency. It should be noted that the time for reading the exhaust air flow monitoring device 6 exhaust measurement value is generally not more than 10 min, to avoid the temperature change in the room for too long to affect the results.

[0034] The long-term air tightness monitoring method is:

[0035] Under normal operating conditions of the monitored room, close the test airtight valve 8 and test fan 9, open the air intake airtight valve 4 and exhaust airtight valve 7, so that the monitored room internal negative pressure value remains constant, read the air intake flow monitoring device 3 and exhaust air flow monitoring device 6 air intake measurement value and exhaust measurement value, and calculate the difference between the air intake measurement value and the exhaust measurement value, and then calculate the difference between the air intake measurement value and the exhaust measurement value under the unit differential pressure according to the real-time results collected by the differential pressure sensor 1. If the difference exceeds the preset limit value, the air tightness of the monitored room is determined to be unsatisfactory, and a warning can be issued.

[0036] The method can be monitored for a long time under normal operating conditions without the need to remove personnel, and can more conveniently realize the qualitative monitoring of the air tightness of the room, overcoming the problem that periodic monitoring can not be effectively traced back.

[0037] In the description of the application, it should be noted that unless otherwise expressly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, can be fixedly connected, can also be detachably connected, or integrally connected; can be mechanically connected, can also be electrically connected; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0038] The above is only the preferred embodiment of the present application, not any form of limitation on the present application, and those skilled in the art can make some simple modifications, equivalent changes or modifications by using the disclosed technical content, which falls within the protection scope of the present application.

Claims

1. An online monitoring method for an online airtightness monitoring system of a high-airtightness room, characterized in that, The airtightness online monitoring system for the high airtightness room includes a differential pressure sensor, an air inlet channel, and an exhaust channel installed on the wall of the room being monitored. An air inlet air-sealing valve and an air inlet air volume monitoring device are installed sequentially from the outside to the inside of the air inlet channel. An exhaust air volume monitoring device and an exhaust air-sealing valve are installed sequentially from the inside to the outside of the exhaust channel. A test channel is also provided on the exhaust channel between the exhaust air volume monitoring device and the exhaust air-sealing valve. A test air-sealing valve and a test fan are provided on the test channel. The air inlet channel is also equipped with an air inlet high-efficiency filter, and the air outlet channel is also equipped with an air outlet high-efficiency filter; Temperature sensors are also installed in the monitored room; The monitored room is also equipped with personnel detection devices; The online monitoring method of the high airtightness room airtightness online monitoring system includes an airtightness pressure decay monitoring method. The airtightness pressure decay monitoring method is as follows: when no one is in the room being monitored, the air inlet and exhaust airtight valves are closed, and the test airtight valve and test fan are opened. The differential pressure sensor monitors the negative pressure value in the room being monitored. When the negative pressure value reaches a first preset value, the test airtight valve and test fan are closed. The negative pressure value collected by the differential pressure sensor is monitored in real time. When the negative pressure value decays to a second preset value, time recording begins synchronously. After a predetermined time, the negative pressure value collected by the differential pressure sensor is recorded. Based on the comparison between the collected negative pressure value and the standard set value, it is determined whether the airtightness of the room being monitored meets the requirements. The online monitoring method of the high airtightness room airtightness online monitoring system also includes an airtightness constant pressure monitoring method. The airtightness constant pressure monitoring method is as follows: when no one is in the room being monitored, the exhaust airtight valve is closed, the inlet airtight valve, the test airtight valve and the test fan are opened, the frequency of the test fan and the valve opening of the inlet airtight valve are adjusted to keep the negative pressure value inside the room being monitored constant, the exhaust air volume monitoring device exhaust measurement value is read, and the obtained hourly exhaust measurement value is divided by the volume of the room being monitored. The ratio is compared with a preset standard value to determine whether the airtightness of the room being monitored meets the requirements.

2. The online monitoring method of the online airtightness monitoring system for high airtightness rooms according to claim 1, characterized in that, Whether there is any human activity inside the monitored room is monitored and determined by a human detection device installed inside the room.

3. The online monitoring method of the online airtightness monitoring system for high airtightness rooms according to claim 2, characterized in that, The airtightness pressure decay monitoring method maintains a stable temperature in the monitored room during the monitoring period.

4. The online monitoring method of the online airtightness monitoring system for high airtightness rooms according to claim 1, characterized in that, Whether there is any human activity inside the monitored room is monitored and determined by a human detection device installed inside the room, and the time for reading the exhaust volume measurement value of the exhaust air volume monitoring device does not exceed 10 minutes.

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