CN201618177U

CN201618177U - Biosafety cabinet controller

Info

Publication number: CN201618177U
Application number: CN2010201105008U
Authority: CN
Inventors: 左小五; 许伟明; 沈昱明
Original assignee: University of Shanghai for Science and Technology
Current assignee: University of Shanghai for Science and Technology
Priority date: 2010-02-09
Filing date: 2010-02-09
Publication date: 2010-11-03
Anticipated expiration: 2020-02-09

Abstract

The utility model relates to a biosafety cabinet controller, a constant current circuit outputs constant current to drive a pressure sensor, output signal from the pressure sensor is passed through an amplifying and filtering circuit and a multiplexer, then is sent to a AD conversion circuit and transformed to digital signal through AD conversion, then the digital signal is sent to a microprocessor to be processed, then a microprocessor 9 regulates the wind-speed of a fan and detects a filter according to the signal. A UV sensor detects the intensity of disinfection ultraviolet, output signal from the UV sensor is conditioned by a UV detection circuit and is sent to the AD conversion circuit by the multiplexer to implement the AD conversion, then the transformed digital signal is sent to the microprocessor to be processed, the microprocessor detects if an ultraviolet lamp of a UV device is invalid according to the signal. The utility model not only has the control function of common biosafety cabinet, but also can detect if the filter is invalid and damaged and the like, thereby the utility model can remind users to renew the filter and the ultraviolet lamp timely, so that the biosafety cabinet is safer and more reliable.

Description

Biological safety cabinet controller

Technical field

This utility model relates to a kind of controller, particularly a kind of sterilization biological safety cabinet controller.

Background technology

Common Biohazard Safety Equipment, because filter is installed in safety cabinet inside, the dust impurity eyes above it are invisible, along with the increase of the dust impurity on the filter, filter effect can reduce gradually, when surpassing certain limit, does not have the function of filtration substantially.In addition, filter in use breakage may occur, and under the air-flow effect, damaged hole can increase gradually, also makes filter lose filtering function.The safety of safety cabinet does not guarantee.

In order to guarantee bactericidal effect, the ultraviolet that the quartz burner of sterilization usefulness sends must reach certain intensity, and actual quartz burner, in using a process, wear out along with the time, the uitraviolet intensity that sends can reduce gradually, thereby reduces Disinfection Effect.The safety of safety cabinet is not guaranteed.

Summary of the invention

This utility model is at the filter failure of Biohazard Safety Equipment and damaged problem, a kind of biological safety cabinet controller has been proposed, reduce and can not satisfy sterilization at Biohazard Safety Equipment Burdick lamp intensity, design a kind of uitraviolet intensity detection technique of Biohazard Safety Equipment, guaranteed the safety of Biohazard Safety Equipment.

The technical solution of the utility model is: a kind of biological safety cabinet controller, comprise limit switch, liquid crystal display, keyboard, memorizer, bus interface circuit, blower fan, illumination, the UV device, expansion of power supply, constant-current circuit, pressure transducer, the amplification filtering circuit, variable connector, A/D convertor circuit, the UV pick off, the UV testing circuit, microprocessor, photoelectricity is isolated and drive circuit, constant-current circuit output constant current drive pressure transducer, the pressure transducer output signal is sent to A/D convertor circuit through amplification filtering circuit and variable connector and carries out AD and convert to and send into microprocessor behind the digital signal and handle, the microprocessor output signal is isolated and drive circuit through photoelectricity, to the Fan Regulation wind speed, the sterilization uitraviolet intensity signal of UV pick off output, nurse one's health after variable connector send A/D convertor circuit to carry out the AD conversion through the UV testing circuit, converting digital signal to is sent to microprocessor and handles, limit switch and keyboard signal input microprocessor, the microprocessor output signal is to liquid crystal display, memorizer, bus interface circuit isolates with drive circuit connecing illumination simultaneously by photoelectricity, UV device and expansion of power supply.

The beneficial effects of the utility model are: this utility model biological safety cabinet controller, based on microprocessor, cooperate relevant functional circuit, except that possessing general biological safety cabinet controller function, also can detect filter failure and filter breakage etc., remind the user in time to change filter; UV pick off etc. can detect the uitraviolet intensity that the UV device sends, and when uitraviolet intensity does not reach when requiring, reminds the user in time to change quartz burner, makes Biohazard Safety Equipment safer, more reliable.

Description of drawings

Fig. 1 is the control principle block diagram of this utility model biological safety cabinet controller.

The specific embodiment

The control principle block diagram of biological safety cabinet controller as shown in Figure 1, comprise constant-current circuit 1, pressure transducer 2, amplification filtering circuit 3, variable connector 4, A/D convertor circuit 5, UV pick off 6, UV testing circuit 7, limit switch 8, microprocessor 9, liquid crystal display 10, keyboard 11, memorizer 12, bus interface circuit 13, photoelectricity is isolated and drive circuit 14, blower fan 15, illumination 16, UV device 17 and expansion of power supply 18, constant-current circuit 1 output constant current drive pressure transducer 2, pressure transducer 2 output signals are sent to A/D convertor circuit 5 through amplification filtering circuit 3 and variable connector 4 carries out AD and converts digital signal to and be sent to microprocessor 9 and handle, and microprocessor 9 is according to the wind speed of this Signal Regulation blower fan and detect filter.

UV pick off 6 detects the sterilization uitraviolet intensity, the signal of UV pick off 6 outputs, nurse one's health after variable connector 4 send A/D convertor circuit 5 to carry out the AD conversion through UV testing circuit 7, convert digital signal to and be sent to microprocessor 9 and handle, whether microprocessor 9 lost efficacy according to the quartz burner of this signal detection UV device.

Whether limit switch 8 detecting gates close, and liquid crystal display 10 shows current wind speed, uitraviolet intensity etc.Keyboard 11 is provided with parameter and operation blower fan etc.; Memorizer 12 saved system parameters.Bus interface circuit 13 increases network function to system, is convenient to remote monitoring.Blower fan 15, illumination 16, UV device 17 and expansion of power supply 18 adopt the photoelectricity isolation to be connected with microprocessor, improve the anti-interference of system.

The filter failure detection technique: safety cabinet is in the increase of use along with the dust impurity on the filter, and filter effect can reduce gradually, when surpassing certain limit, does not have function, the just filter failure of filtration substantially.Along with the increase of dust impurity on the filter, can increase gradually the resistance of air-flow, for keeping negative pressure in the safety cabinet, the controlled quentity controlled variable of blower fan can increase gradually, and the pressure reduction of filter both sides can increase gradually.Have two kinds of methods to detect filter failure like this: method detects filter failure according to the controlled quentity controlled variable of blower fan for the moment, when the blower fan controlled quentity controlled variable increases to certain numerical value, just assert filter failure.Method two is that the pressure reduction that detects the filter both sides detects filter failure, when the pressure reduction of filter both sides surpasses certain numerical value, just assert filter failure.

The damaged detection technique of filter: safety cabinet is in the process of using, because the increase of dust impurity on the filter, resistance to air-flow can increase gradually, and for keeping the negative pressure in the safety cabinet, the controlled quentity controlled variable of blower fan can increase gradually, the pressure reduction of filter both sides also can increase gradually, when breakage appearred in filter, under the air-flow effect, damaged hole can increase gradually, filter can reduce gradually to the resistance of air-flow, and the controlled quentity controlled variable of blower fan also can reduce gradually.Detecting the damaged forwarding method of filter is: the controlled quentity controlled variable of blower fan and the pressure reduction of filter both sides when record has just more renewed filter, the pressure reduction of filter both sides and the controlled quentity controlled variable of blower fan when record is worked at every turn, when increasing progressively gradually, these two quantity of states represent that then filter is out of question, diminish gradually when these two amounts occurring, represent that then breakage has appearred in filter, particularly these two amounts all hour, represent that then the filter breakage is very serious when just more having renewed filter.

Ultraviolet ray intensity detecting method: utilize UV sensor, detect ultraviolet intensity, when ultraviolet intensity less than when setting value, bad even uviol lamp does not have, for guaranteeing bactericidal effect, also to point out the user to change uviol lamp.

Claims

1. biological safety cabinet controller, comprise limit switch, liquid crystal display, keyboard, memorizer, bus interface circuit, blower fan, illumination, UV device and expansion of power supply, it is characterized in that, also comprise constant-current circuit, pressure transducer, the amplification filtering circuit, variable connector, A/D convertor circuit, the UV pick off, the UV testing circuit, microprocessor, photoelectricity is isolated and drive circuit, constant-current circuit output constant current drive pressure transducer, the pressure transducer output signal is sent to A/D convertor circuit through amplification filtering circuit and variable connector and carries out AD and convert to and send into microprocessor behind the digital signal and handle, the microprocessor output signal is isolated and drive circuit through photoelectricity, to the Fan Regulation wind speed, the sterilization uitraviolet intensity signal of UV pick off output, nurse one's health after variable connector send A/D convertor circuit to carry out the AD conversion through the UV testing circuit, converting digital signal to is sent to microprocessor and handles, limit switch and keyboard signal input microprocessor, the microprocessor output signal is to liquid crystal display, memorizer, bus interface circuit isolates with drive circuit connecing illumination simultaneously by photoelectricity, UV device and expansion of power supply.