CN210243110U - Laboratory air tightness detection device - Google Patents
Laboratory air tightness detection device Download PDFInfo
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- CN210243110U CN210243110U CN201921505769.3U CN201921505769U CN210243110U CN 210243110 U CN210243110 U CN 210243110U CN 201921505769 U CN201921505769 U CN 201921505769U CN 210243110 U CN210243110 U CN 210243110U
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Abstract
The utility model discloses a laboratory gas tightness detection device, include: the PLC control component is used for monitoring and adjusting the air pressure of the laboratory; the air pump assembly is connected with the reserved detection port of the laboratory through a connecting pipe; the differential pressure sensor, the gas flow sensor and the negative pressure flow transmitter are connected with the PLC control assembly and arranged on the connecting pipe; the frequency conversion component is connected with the PLC control assembly; and the power supply is used for supplying power to the PLC control unit, the differential pressure sensor, the frequency conversion component gas flow sensor and the negative pressure flow transmitter. The laboratory air tightness detection device provided by the utility model has the advantages of simple structure, high integration level and convenient use, can detect the air tightness of a laboratory through a positive pressure detection method or a negative pressure detection method, and has high experimental detection precision; and only one leakage detection port is reserved in the detected laboratory, so that the situation that a plurality of reserved ports are arranged on the peripheral structure of the existing laboratory is avoided, and the leakage risk is reduced.
Description
Technical Field
The utility model relates to a detecting instrument's technical field, concretely relates to laboratory gas tightness detection device.
Background
The raw materials used for high-grade biosafety laboratory research are mostly cell, virus and other microorganisms and tissue, cell, body fluid and other tissue extracts. The inherent characteristics of the raw materials used by the biological safety agent and the potential dangers of certain new products generated by the biological safety agent cause high attention of all countries due to the biological safety problems in the processes of developing and producing biological products. The biological risk of the high-grade biological safety laboratory is relatively high, the air tightness of the laboratory is one of important indexes of the performance of the high-grade biological safety laboratory, and the air tightness of the peripheral structure is a physical basis for isolating the high-grade biological safety laboratory from the external environment and is an important guarantee for the biological safety and reliability.
In order to strictly control the air tightness, airflow organization and the like of an enclosure structure, before a high-grade biological safety laboratory is formally used, the enclosure structure of the biological laboratory needs to be subjected to tightness detection, the leakage rate is calculated by measuring the leakage amount of the laboratory, whether the air tightness of the laboratory reaches the standard is checked, and the influence on the surrounding environment of the laboratory caused by the escape of microorganisms is prevented.
However, at present, no formed equipment exists for detecting air tightness, and the existing measurement method can only adopt one of a constant pressure test method or a pressure attenuation test method to detect the air tightness.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a laboratory gas tightness detection device, include:
the PLC control component is used for monitoring and adjusting the air pressure of the laboratory;
the air pump assembly is connected with the reserved detection port of the laboratory through a connecting pipe;
the differential pressure sensor, the gas flow sensor and the negative pressure flow transmitter are connected with the PLC control assembly and arranged on the connecting pipe;
the frequency conversion component is connected with the PLC control assembly;
and the power supply is used for supplying power to the PLC control unit, the differential pressure sensor, the frequency conversion component gas flow sensor and the negative pressure flow transmitter.
In the above scheme, the connecting pipe is provided with a temperature and humidity sensor connected with the PLC control component.
In the above scheme, the air pump assembly comprises an air pump and an air pump interface connected through a first connecting pipe;
and a negative pressure safety valve and an electromagnetic stop valve are arranged at the port of the air pump.
In the scheme, the system further comprises a laboratory interface;
the outlet end of the air pump interface is connected with the inlet/outlet end of the laboratory interface through a second connecting pipe; the laboratory interface outlet/inlet end is detachably connected with the reserved detection port of the laboratory through a third connecting pipe.
In the above scheme, the device further comprises a printer and a USB port connected to the PLC control component.
In the above scheme, the PLC control unit includes a touch display.
In the scheme, the device further comprises a shock absorption box; a limiting layer is arranged in the shock absorption box, and a storage cavity for placing the air pump is arranged at the lower end of the limiting layer; the limiting layer positioned on the left side of the storage cavity is respectively provided with a USB port, an air pump interface and a laboratory interface;
and the limiting layer positioned on the upper side of the storage cavity is respectively provided with a touch display, a printer, a differential pressure sensor, a frequency conversion component and a gas flow sensor.
In the above scheme, the air pump is fixed in the storage cavity through a limiting belt arranged on the limiting layer.
In the scheme, the bottom surface of the shock absorption box is provided with universal wheels.
In the above scheme, the PLC control component includes a PLC control unit and a touch display connected to the PLC control unit;
the PLC control unit is also provided with a storage module and a wireless transmission module which are arranged on the PLC control unit.
The laboratory air tightness detection device provided by the utility model has the advantages of simple structure, high integration level and convenient use, can detect the air tightness of a laboratory through a positive pressure detection method or a negative pressure detection method, and has high experimental detection precision; and only one leakage detection port is reserved in the detected laboratory, so that the situation that a plurality of reserved ports are arranged on the peripheral structure of the existing laboratory is avoided, and the leakage risk is reduced.
Drawings
Fig. 1 is a schematic structural diagram provided by the present invention;
fig. 2 is a schematic side view of the present invention;
fig. 3 is a schematic diagram of a touch display according to an embodiment of the present invention;
FIG. 4 is a schematic view of the connection of the components during negative pressure detection provided by the present invention;
FIG. 5 is a schematic view of the connection between the device of the present invention and a laboratory during negative pressure detection;
FIG. 6 is a schematic view of the connection between the device of the present invention and the laboratory during positive pressure test;
fig. 7 is a schematic diagram of a printing result provided by the present invention.
Detailed Description
The invention is described in detail below with reference to specific embodiments and the accompanying drawings.
As shown in fig. 1-2, the utility model provides a laboratory air tightness detection device, which comprises a PLC control assembly for monitoring and adjusting the air pressure in the laboratory; the air pump assembly is detachably connected with the reserved detection port of the laboratory through a connecting pipe; a differential pressure sensor 5, an air flow sensor 7 and a negative pressure flow transmitter 16 which are connected with the PLC control assembly and arranged on the connecting pipe; the frequency conversion component 6 is connected with the PLC control assembly;
The PLC control component includes a PLC control unit and a touch display 2 connected to the PLC control unit, as shown in fig. 3, and a tester can set test information, such as a laboratory name, a test method, a test standard negative/positive pressure value, a test duration, and the like, through the touch display.
In this embodiment, be equipped with and be connected with the PLC control unit and be used for temperature and humidity sensor 4 of real-time detection laboratory humiture.
In this embodiment, the air pump assembly includes an air pump 8 interface and an air pump interface 11 end connected by a first connection pipe; the laboratory interface 10 is connected with the other port of the air pump interface 11 through a second connecting pipe; the other end of the laboratory interface 10 is detachably connected with a reserved laboratory detection port through a third connecting pipe; first connecting pipe, second connecting pipe and the hose that the third connecting pipe all can be for being convenient for accomodate, and be connected with dismantling with being connected of each interface, the accomodating of this device after practical of being convenient for.
A negative pressure safety valve 17 is arranged at the port of the air pump 8, so that the overlarge negative pressure value of the pipeline is avoided, and the device is prevented from being damaged.
An electromagnetic stop valve 15 is also arranged at the port of the air pump 8, preferably arranged at the air pump interface 11 or on the second connecting pipe and used for stopping the air circulation in the pipe and protecting the negative pressure value in the pipe,
as shown in fig. 4, when the air tightness of the laboratory is detected by the negative pressure detection method, the electromagnetic stop valve 15 is disposed at the air pump interface 11 or on the second connection pipe, specifically, the electromagnetic stop valve 15 is disposed adjacent to the negative pressure safety valve 17 and away from the laboratory interface 10, and the temperature and humidity sensor 4, the differential pressure sensor 5, the gas flow sensor 7, and the negative pressure flow transmitter 16 are disposed on the second connection pipe between the electromagnetic stop valve 15 and the laboratory interface 10, so that when the air pump 8 is stopped by the electromagnetic stop valve 15 from flowing, the temperature and humidity sensor 4, the differential pressure sensor 5, and the gas flow sensor 7 can normally measure the pressure difference, the temperature and the humidity, and the gas flow in the pipe;
when the positive pressure detection method is used for detecting the air tightness of the laboratory, the electromagnetic stop valve 15 is arranged at the laboratory interface 10 or on the second connecting pipe, specifically, the electromagnetic stop valve 15 is arranged adjacent to the laboratory interface 10, and the second connecting pipe between the electromagnetic stop valve 15 and the air pump interface 11 is provided with the temperature and humidity sensor 4, the differential pressure sensor 5, the gas flow sensor 7 and the negative pressure flow transmitter 16,
above-mentioned electromagnetic stop valve 15's setting can avoid causing detection error because of first connecting pipe or first connecting pipe connection port leak gas, makes the experiment detect the rate of accuracy higher.
This embodiment still includes printer 3 and the USB port 9 of being connected with PLC control assembly to and locate storage module and wireless transmission module on the PLC the control unit, be convenient for store the result of detection to storage module in, and accessible printer 3 or USB port 9 prints out the result or imports into other equipment.
In the embodiment, in order to facilitate the movement of the detection device, the device comprises a shock absorption box 1 for integrating the components;
a limiting layer 101 is arranged in the shock absorption box 1, and a storage cavity 102 for placing an air pump 8 is arranged at the lower end of the limiting layer 101; the limiting layer 101 positioned on the left side of the storage cavity 10 can be respectively provided with a USB port 9, a laboratory interface 10, an air pump interface 11, a power supply port 12, a pump power supply port 13 and a main switch 14 according to requirements; the limiting layer 101 positioned on the upper side of the storage cavity 102 is respectively provided with a touch display 2, a printer 3, a differential pressure sensor 5, a frequency conversion component 6 and a gas flow sensor 7; in the embodiment, the power part air pump 8 is stored at the lower end of the shock absorber 1, so that the air pump 8 can conveniently take and adjust the gravity center of an instrument to move downwards, the stability of the device is improved, and the data display parts are all arranged at the upper end of the shock absorber 1, so that the viewing and the operation are convenient; in the embodiment, 220V/50Hz commercial power is connected, the power supply is led in from the power supply port 12, and the fusing protection device is contained in the power supply port 12.
In this embodiment, the power input end of the air pump 8 is connected to the pump power port 13 and contains an overcurrent protection device, the air pump 8 is not turned on or off with the switch of the main switch 14, and the air pump 8 is controlled by the PLC control unit to be turned on or off.
In this embodiment, the air pump 8 is fixed in the storage cavity 102 through a limiting belt 103 disposed on the limiting layer 101, and the limiting belt 103 may be a buckle-type limiting belt or a hook-type limiting belt.
In this embodiment, in order to facilitate the movement of the shock-absorbing box 1, the bottom surface of the shock-absorbing box 1 is provided with universal wheels.
In the present embodiment, the first and second electrodes are,
the PLC control component is a Siemens 4.3 inch touch screen, and the parameters are as follows:
memory 128M FLASH +128MB DDR3
CPU crotex A8 600Hz
Serial port interface RS232/422/485
Temperature and humidity sensor 4 is a Taida pipeline type temperature and humidity transmitter, and the parameters are as follows:
t ranges from 0 ℃ to 50 +/-0.3 DEG C
H is in the range of 0-99.9% +/-3%
Output 0-10V
The frequency conversion component 6 is an EBM frequency converter, and the parameters are as follows:
input 220V/50Hz
Frequency conversion of 0-50Hz
Input 0-10V
The gas flow sensor 7 is a chip MF5600, and the parameters are:
the flow range is 0-300L/min
Output 0-10V
The differential pressure sensor 5 is a chip A2DU, and the parameters are:
pressure difference measuring range +/-1.0 KPa
Output 4-20mA
The present embodiment is explained below by a specific operation principle.
In this embodiment, it can only to reserve a leak hunting mouth by the laboratory, avoids current laboratory enclosure structure to set up many places and reserves the mouth, increases the leakage risk, and the advantage lies in, and the laboratory gas tightness test is easy to appear leaking the reason and includes that wall (floor, smallpox) equipment and pipeline self gas tightness and installation gas tightness etc. do not satisfy the requirement to this gas tightness is a comprehensive index.
Firstly, detecting the air tightness of a laboratory by adopting a negative pressure detection method
As shown in fig. 5, when the negative pressure detection method is used to detect the air tightness of the laboratory, the device of the present invention is placed outside the laboratory, the laboratory interface 10 is connected with the laboratory reserved detection port through the spring air pipe, the air 8 is placed on the flat ground, the air pump 8 air pumping port is connected with the air pump interface 11 through the hose, the power input end of the air pump 8 is connected with the pump power port 13 through the wire, the power is introduced from the power port 12, the master switch LED lamp is turned on after the master switch 14 is pressed, and the control component PCL control unit, the frequency conversion component 6, the detection component temperature and humidity sensor 4, the pressure difference sensor 5 and the gas flow sensor 7 are controlled; the input display part touch display 2, the output part printer 3 and the USB output port 9 are powered on.
The testing personnel sets the testing information including laboratory name, testing method, testing standard negative/positive pressure value, testing duration and the like through the touch display, and starts the control device to work,
the air pump (8) starts to work, the air in the laboratory to be detected is pumped out to the outside, the air passing path is specifically illustrated but not limited to the lower path, the air passing path is mainly related to the positions of the air flow sensor 7, the pressure difference sensor 5 and the temperature and humidity sensor 4 which are arranged on the hose,
gas passing path: the air pump 8, the negative pressure flow transmitter 16, the air pump interface 11, the gas flow sensor 7, the differential pressure sensor 5, the temperature and humidity sensor 4, the electromagnetic stop valve 15, the laboratory interface 10 and the air are extracted from the laboratory to be tested.
Differential pressure sensing part 5 detects pressure difference in the pipeline, the detection data feeds back to PLC the control unit, PLC the control unit compares with setting for the detection standard negative pressure value, its deviation passes through the airflow of frequency conversion part 6 automatically regulated air pump 8, thereby maintain the pipeline internal pressure and set for standard negative pressure value within range, when negative pressure reaches setting for standard negative pressure value in the laboratory, air pump 8 stop work, solenoid stop valve 15 closes hose pipeline passageway simultaneously, gas flow is promptly for being surveyed the leakage quantity of laboratory under the detection standard negative pressure operating mode in the gas flow sensing part 7 detector pipeline this moment.
Secondly, detecting the air tightness of the laboratory by adopting a positive pressure detection method
As shown in FIG. 6, when adopting negative pressure detection method to detect laboratory gas tightness, will the utility model discloses the device is placed outside the laboratory, and it is unanimous to connect the step and detect the laboratory with above-mentioned adoption negative pressure detection method, and after the measurement personnel passed through touch-control display 2 settlement parameter, started through PCL controller 2, and air pump 8 begins work, with outdoor air suction to being surveyed indoor.
The gas path is formed by: the laboratory interface 10, the electromagnetic stop valve 15, the temperature and humidity sensing part 4, the pressure difference sensing part 5, the gas flow sensing part 7, the air pump interface 11, the negative pressure flow transmitter 16, the air pump 8 and the outdoor air are sent into the laboratory to be tested.
Pressure difference sensing part 5 detects the laboratory pressure of being surveyed, will detect data feedback to PLC the control unit, PLC the control unit compares with setting for the detection standard malleation value, its deviation passes through frequency conversion part 6, the air flow of negative pressure regulating transducer 16 automatically regulated air pump 8, thereby maintain the laboratory pressure of being surveyed and detect standard malleation value, when being surveyed the laboratory pressure and reaching stable detection standard malleation value, air pump 8 stop work, electromagnetism stop valve 15 closes the pipeline passageway simultaneously, PLC the control unit timing begins, record the laboratory pressure decrement of being surveyed in the settlement time.
As shown in fig. 7, the graphs (a) and (b) are the results of the negative pressure detection method and the positive pressure detection method, respectively, and are printed by the printer 3, and the experimental detection parameters corresponding to the negative pressure detection method and the positive pressure detection method are as follows:
a negative pressure detection method comprises the following steps: setting the pressure to be 250Pa, and recording the change amount of the pressure difference in the laboratory within 20 minutes, namely: and (4) air leakage of the room.
Positive pressure detection method: the pressure was set at 500Pa and the change in differential pressure in the laboratory over 20 minutes was recorded.
The detection data are displayed and recorded in the PLC control unit, and the detection data and the national standard reaching value can be printed out through the printer 3 for comparison and judgment. The data can be output and stored in the USB flash disk through the USB output port 9, and is convenient for external storage and carrying.
The present invention is not limited to the above-mentioned best mode, and any person should learn the structural changes made under the teaching of the present invention, all of which have the same or similar technical solution, and all fall into the protection scope of the present invention.
Claims (10)
1. A laboratory airtightness detection apparatus, comprising:
the PLC control component is used for monitoring and adjusting the air pressure of the laboratory;
the air pump assembly is connected with the reserved detection port of the laboratory through a connecting pipe;
a differential pressure sensor (5), a gas flow sensor (7) and a negative pressure flow transmitter (16) which are connected with the PLC control assembly and arranged on the connecting pipe;
the frequency conversion component (6) is connected with the PLC control assembly;
and the power supply is used for supplying power to the PLC control unit, the differential pressure sensor (5), the frequency conversion component (6), the gas flow sensor (7) and the negative pressure flow transducer (16).
2. The laboratory airtightness detection apparatus according to claim 1, wherein the connection pipe is provided with a temperature/humidity sensor (4) connected to the PLC control unit.
3. Laboratory airtightness detection apparatus according to claim 1, wherein the air pump assembly includes an air pump (8) and an air pump interface (11) connected through a first connection pipe;
and a negative pressure safety valve (17) and an electromagnetic stop valve are arranged at the port of the air pump (8).
4. Laboratory airtightness detection apparatus according to claim 3, further comprising a laboratory interface (10);
the outlet end of the air pump interface (11) is connected with the inlet/outlet end of the laboratory interface (10) through a second connecting pipe; the outlet/inlet end of the laboratory interface (10) is detachably connected with the reserved detection port of the laboratory through a third connecting pipe.
5. The laboratory airtightness detection apparatus according to claim 4, further comprising a printer (3) and a USB port (9) connected to the PLC control module.
6. Laboratory airtightness detection apparatus according to claim 4, wherein the PLC control unit includes a touch display (2).
7. The laboratory airtightness detection apparatus according to claim 6, further comprising a damper box (1);
a limiting layer (101) is arranged in the shock absorption box (1), and a storage cavity (102) for placing the air pump (8) is arranged at the lower end of the limiting layer (101); the limiting layer (101) positioned on the left side of the storage cavity (102) is respectively provided with a USB port (9), an air pump interface (11) and a laboratory interface (10);
and the limiting layer (101) positioned on the upper side of the storage cavity (102) is respectively provided with a touch display (2), a printer (3), a differential pressure sensor (5), a frequency conversion component (6) and a gas flow sensor (7).
8. The laboratory airtightness detection apparatus according to claim 7, wherein the air pump (8) is fixed in the storage chamber (102) by a stopper belt (103) provided on the stopper layer (101).
9. The laboratory airtightness detection apparatus according to claim 7, wherein the bottom surface of the damper box (1) is provided with universal wheels.
10. The laboratory airtightness detection apparatus according to claim 1, wherein the PLC control unit includes a PLC control unit, and a touch display (2) connected to the PLC control unit;
the PLC control unit is also provided with a storage module and a wireless transmission module which are arranged on the PLC control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921505769.3U CN210243110U (en) | 2019-09-11 | 2019-09-11 | Laboratory air tightness detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921505769.3U CN210243110U (en) | 2019-09-11 | 2019-09-11 | Laboratory air tightness detection device |
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| CN210243110U true CN210243110U (en) | 2020-04-03 |
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| CN201921505769.3U Active CN210243110U (en) | 2019-09-11 | 2019-09-11 | Laboratory air tightness detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112484934A (en) * | 2019-09-11 | 2021-03-12 | 北京久杰净化工程技术有限公司 | Laboratory air tightness detection device |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112484934A (en) * | 2019-09-11 | 2021-03-12 | 北京久杰净化工程技术有限公司 | Laboratory air tightness detection device |
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