CN103223356B - Clean biological safety cabinet control system - Google Patents
Clean biological safety cabinet control system Download PDFInfo
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- CN103223356B CN103223356B CN201310086478.6A CN201310086478A CN103223356B CN 103223356 B CN103223356 B CN 103223356B CN 201310086478 A CN201310086478 A CN 201310086478A CN 103223356 B CN103223356 B CN 103223356B
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- 239000011941 photocatalyst Substances 0.000 claims abstract description 27
- 239000000523 sample Substances 0.000 claims abstract description 6
- 230000010354 integration Effects 0.000 claims abstract description 5
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 25
- 230000001413 cellular effect Effects 0.000 claims description 11
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 8
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 6
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- 239000004408 titanium dioxide Substances 0.000 claims description 4
- 238000002474 experimental method Methods 0.000 abstract description 3
- 238000004140 cleaning Methods 0.000 abstract 3
- 238000005949 ozonolysis reaction Methods 0.000 abstract 2
- 238000004659 sterilization and disinfection Methods 0.000 description 7
- 230000001954 sterilising effect Effects 0.000 description 6
- 239000006185 dispersion Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- GVJHHUAWPYXKBD-UHFFFAOYSA-N (±)-α-Tocopherol Chemical compound OC1=C(C)C(C)=C2OC(CCCC(C)CCCC(C)CCCC(C)C)(C)CCC2=C1C GVJHHUAWPYXKBD-UHFFFAOYSA-N 0.000 description 2
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- WIGCFUFOHFEKBI-UHFFFAOYSA-N gamma-tocopherol Natural products CC(C)CCCC(C)CCCC(C)CCCC1CCC2C(C)C(O)C(C)C(C)C2O1 WIGCFUFOHFEKBI-UHFFFAOYSA-N 0.000 description 1
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- Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
Abstract
The invention relates to a clean biological safety cabinet control system and belongs to the technical field of experiment equipment. A first ultraviolet lamp and a first photocatalyst layer are sequentially arranged at the air inlet of the cleaning room of a biological safety cabinet, a first ozonolysis layer, an air discharge filter and a second photocatalyst layer are sequentially arranged at an air outlet, a second ozonolysis layer, a main filter and a third photocatalyst layer are sequentially arranged between a work room and the cleaning room, the control system is provided with a first differential pressure sensor, two probes of the first differential pressure sensor are arranged in a negative pressure air channel and the cleaning room respectively, and an air pressure difference amplifier is used for amplifying the voltage signal output by the first differential pressure sensor; and an error amplifier amplifies the electric signal output by the differential pressure sensor, a proportion integrator integrates the error amplifier and provides the obtained integration to a variable-frequency speed regulator, and the variable-frequency speed regulator supplies a variable-frequency power supply to a fan according to an input signal in order to change the rotation speed of the fan. The control system can automatically adjust the air speed in the work room to homogenize the air speed.
Description
Technical field
The present invention relates to a kind of clean biological safety cabinet control system, particularly relate to a kind of can purifying air and the Biohazard Safety Equipment of energy automatic speed regulation, belong to technical field of experiment equipment.
Background technology
Fig. 1 is the side schematic view of Biohazard Safety Equipment of the prior art.As shown in Figure 1, described Biohazard Safety Equipment comprises the housing 1 be arranged on support 30, and the lower end of four legs of support 30 is provided with castor 31.Housing 1 comprises front shrouding 25, front shroud 26, Zuo Bi, You Bi, roof and diapire, portion is provided with an air dispersion plate 27 within the case 1, the first half of front shroud 26, left wall, the first half of right wall, roof and air dispersion plate form a upper space, the latter half of front shrouding 25, left wall, the latter half of right wall and diapire form a lower space, clean room 2 is provided with in upper space, operating room 3 is provided with in lower space, front shrouding 25 can movablely also can be contracted in upper space, and the base plate 29 of the lower end in operating room is provided with pore.Clean room is connected after the structure that formed with operating room, the left side and the right side form negative pressure channel, and the platform of the air inlet of clean room is laid blower fan 4.The top of clean room is provided with exhaust outlet, is arranged with exhaust-air filter 10 at exhaust outlet.Between clean room 2 and operating room 3 establish, main filter 11 is set.In upper space, be provided with the motor 24 of shrouding 25 before driving, be arranged with illuminating lamp 28 at front shroud 26.In order to sterilization, at indoor location UV (ultraviolet) lamp 32 that works, namely UV (ultraviolet) lamp is utilized to carry out irradiating and kill organic compound in air or mushroom, but sterilization is not thorough, and meanwhile, Ultraviolet radiation also makes the oxygen in air become ozone, when the concentration over-standard of the ozone in air, ozone is then an invisible killer, and the respiratory tract of its intense stimulus people, causes abscess of throat, cough uncomfortable in chest, causes bronchitis and pulmonary emphysema; Cause the neurotoxic of people, dizziness headache, visual impairment, to be losing one's memory; Destruction is played to the vitamin E in human body skin, cause the skin of people wrinkling, there is blackspot; Also can destroy the immunity function of human body, bring out lymphocyte chromosome pathology, accelerate old and feeble, cause pregnant woman to have a deformed child, the ozone that therefore Biohazard Safety Equipment is discharged can cause the secondary pollution to air, and ozone can cause some experiment material Strong oxdiative simultaneously.
Summary of the invention
For overcoming in prior art existing shortcoming, goal of the invention of the present invention is to provide a kind of clean biological safety cabinet, described Biohazard Safety Equipment can sterilizing, sterilization, and secondary pollution can not be caused to air.
For realizing described goal of the invention, the invention provides a kind of clean biological safety cabinet control system, described safety cabinet comprises housing, operating room is provided with in housing, clean room and air circulation system, wherein clean room is arranged on operating room, air circulation system is used for circulating air between operating room and clean room, air circulation system comprises the blower fan being arranged on clean room's air inlet, it is characterized in that, the first ultraviolet lamp and the first photocatalyst layer is also disposed with at the air intake vent place of clean room, the first ozone decomposed layer is disposed with at exhaust outlet place, exhaust-air filter and the second photocatalyst layer, the second ozone decomposed layer is disposed with between operating room and clean room, main filter and the 3rd photocatalyst layer, in clean room, the direction of vertical first ultraviolet lamp is provided with the second ultraviolet lamp, described control system is also provided with the first differential pressure pickup, two probes of the first differential pressure filter are separately positioned in negative pressure air channel and clean room, the voltage signal that leeway amplifier exports for amplifying the first differential pressure pickup, the signal of telecommunication that error amplifier increased drawdown sensor exports, proportional integrator carries out integration to the signal that error amplifier exports and is supplied to variable-frequency governor, and variable-frequency governor provides Frequency power supply to change to make the rotating speed of blower fan according to inputted signal fan.
Preferably, described control system also comprises the second differential pressure pickup, the first threshold values comparator and the second threshold values comparator, two detecting heads of this second differential pressure pickup are separately positioned on the both sides of primary filter, wherein, first threshold values comparator is used for the signal that exported by the second differential pressure pickup and the first threshold values compares, when inputted signal is greater than or equal to the first threshold values, processor sends signal to alarm and display, make alarm equipment alarm, make display show the printed words of primary filter inefficacy; Second threshold values comparator is used for the signal that exported by the second differential pressure pickup and the second threshold values compares, when inputted signal is less than or equal to the second threshold values, processor sends signal to alarm and display, make alarm equipment alarm, make display show the printed words of primary filter breakage.
Preferably, described control system also comprises the 3rd differential pressure pickup, the 3rd threshold values comparator and the 4th threshold values comparator, two detecting heads of the 3rd differential pressure pickup are separately positioned on the both sides of main filter, wherein, 3rd threshold values comparator is used for the signal that exported by the 3rd differential pressure pickup and the 3rd threshold values compares, when inputted signal is greater than or equal to the 3rd threshold values, processor sends signal to alarm and display, make alarm equipment alarm, make display show the printed words of main filter failure; 4th threshold values comparator is used for the signal that exported by the 3rd differential pressure pickup and the 4th threshold values compares, when inputted signal is less than or equal to the 4th threshold values, processor sends signal to alarm and display, makes alarm equipment alarm, makes display show the printed words of main filter breakage.
Another aspect of the present invention provides a kind of Biohazard Safety Equipment, described safety cabinet comprises housing, operating room is provided with in housing, clean room and air circulation system, wherein clean room is arranged on operating room, air circulation system is used for circulating air between operating room and clean room, air circulation system comprises the blower fan arranging clean room's air inlet, it is characterized in that, the first ultraviolet lamp and the first photocatalyst layer is disposed with at the air intake vent place of clean room, the first ozone decomposed layer is disposed with at exhaust outlet place, exhaust-air filter and the second photocatalyst layer, the second ozone decomposed layer is disposed with between operating room and clean room, main filter and the 3rd photocatalyst layer, in clean room, the direction of vertical first ultraviolet lamp is provided with the second ultraviolet lamp.
Preferably, first, second, and third photocatalyst layer all has cellular through hole, and the surface of described cellular through hole is coated with titanium dioxide granule.
Preferably, described first ozone decomposed layer and the second ozone decomposed layer have multiple cellular through hole, the surface of each through hole are coated with manganese dioxide particle.
Compared with prior art, the control system of Biohazard Safety Equipment provided by the invention can automatically speed governing wind speed, and Biohazard Safety Equipment provided by the invention can sterilization, sterilization, and odorless is pollution-free.
Figure of description
Fig. 1 is the side schematic view of Biohazard Safety Equipment of the prior art;
Fig. 2 is the front schematic view of Biohazard Safety Equipment provided by the invention;
Fig. 3 is the side schematic view of Biohazard Safety Equipment provided by the invention;
Fig. 4 is the circuit diagram of the control system of Biohazard Safety Equipment provided by the invention.
Detailed description of the invention
Describe the present invention in detail below in conjunction with accompanying drawing, identical Reference numeral represents identical or similar parts.
Fig. 2 is the schematic diagram of Biohazard Safety Equipment provided by the invention.Fig. 3 is the side schematic view of Biohazard Safety Equipment provided by the invention.As shown in Figures 2 and 3, described Biohazard Safety Equipment comprises the housing 1 be arranged on support 30, housing comprises front shrouding 26 (adopting flexible glass door in the present invention), front shroud 25, Zuo Bi, right wall, roof and diapire, portion is provided with an air dispersion plate 27 within the case 1, front shroud 26, the first half of left wall, the first half of right wall, roof and air dispersion plate form a upper space, front shrouding 25, the latter half of left wall, the latter half of right wall and diapire form a lower space, clean room 2 is provided with in upper space, operating room 3 is provided with in lower space, front shrouding 25 can movablely also can be contracted in upper space, lower end in operating room is provided with pore.Clean room and operating room are connected after the structure that formed, the left side and form negative pressure air channel between the right side and housing, blower fan 4 laid by the platform of the air inlet of clean room 4, the exhaust outlet place of blower fan 4 is provided with sterilization and disinfection device, described sterilization and disinfection device comprises the first ultraviolet lamp 6 and the first photocatalyst layer 25, the UV-irradiation that organic pollution in air sends through ultraviolet lamp 6 forms contaminant particle material, and contaminant particle electrodeposition substance is on the first photocatalyst layer 25.Photocatalyst layer 25 air outlet place be provided with distinguished and admirable guide plate 14, on the left wall of clean room, the place corresponding with the air outlet of photocatalyst layer 25 is provided with distinguished and admirable guide way 15, described distinguished and admirable guide way is top is that semicircle is spherical, and bottom is columniform combination.The top of clean room is provided with exhaust outlet, under exhaust outlet, is disposed with the first ozone decomposed layer 12 and exhaust-air filter 10 and the second photocatalyst layer 9.Between clean room 2 and operating room 3, be disposed with the 3rd smooth contact layer 8, main filter 11 and the second ozone decomposed layer 13, described ozone decomposed layer has multiple cellular through hole, the surface of each through hole is coated with manganese dioxide particle.Photocatalyst layer 8,9 and 25 has cellular through hole, and the surface of through hole is coated with titanium dioxide granule.
Still as shown in Figure 2, control system provided by the invention comprises processor 21, display 22, alarm 23 and power supply 20 and wind pressure sensor (differential pressure pickup) 16, wind pressure sensor (differential pressure pickup) 17 and wind pressure sensor (differential pressure pickup) 18.Wherein, two probes of wind pressure sensor 16 are separately positioned on the both sides of exhaust-air filter 12, for detecting the blast of exhaust-air filter 10 upstream and the difference of extraneous blast, leeway are converted to voltage u
1be input to processor 21; Two probes of wind pressure sensor 17 are separately positioned on the both sides of main filter 13, for detecting the main blast of filter 13 upstream and the leeway in downstream, leeway are converted to voltage u
2be input to processor 21.Two probes of wind pressure sensor 18 are separately positioned in negative pressure air channel and clean room, for detecting the difference of the blast in negative pressure air channel and clean room, leeway are converted to voltage signal u
3.Processor is according to voltage u
1situation of change judge whether exhaust-air filter 12 lost efficacy, if lost efficacy, processor 21 can send a signal to alarm 23, and prompting user exhaust-air filter lost efficacy, and user changes exhaust-air filter in time.Processor is according to voltage u
2situation of change judge whether main filter lost efficacy, if lost efficacy, processor 21 can send a signal to alarm 23, and householder's filter failure is used in prompting, and user changes lower filter in time.Processor 21 is according to voltage u
2situation of change judge whether main filter lost efficacy, if lost efficacy, processor can send a signal to alarm, and householder's filter failure is used in prompting, user's more change owner filter in time.
Fig. 4 is the circuit diagram of the control system of Biohazard Safety Equipment provided by the invention.As shown in Figure 4, control system provided by the invention also comprises button AN1-AN6, upper limit Hall switch KH1 and lower limit Hall switch KL1, and wherein button AN1-AN6 is arranged on the front shroud of housing.Upper limit Hall switch KH1 is arranged on the upper end of work, and lower limit Hall switch KL1 is arranged on the lower end of work.The lower end of glass retractable door is provided with magnet steel, and when door closes operating room, magnet steel is aimed at lower limit Hall switch KL1, and KL1 closes.Processor 21 comprises controller, first threshold values comparator OP1, first photoelectrical coupler PE1, second threshold values comparator OP2, second photoelectrical coupler PE2, 3rd threshold values comparator OP3, 3rd photoelectrical coupler PE3, ozone the 4th threshold values comparator OP4, 4th photoelectric coupling PE4, for driving the first driver of the first relay J 1, for driving the second driver of the second relay J 2, for driving the 3rd driver of the 3rd relay J 3, for driving the 3rd driver of the 3rd relay J 3, for driving the four-wheel drive device of the 4th relay J 4, for driving the drive circuit of alarm and multiple relay.
Wherein, threshold values comparator OP1 to OP4 is operational amplifier.The in-phase end of the first threshold values comparator OP1 inputs the first threshold voltage, this voltage is obtained by variable resistor RW1 dividing potential drop by power supply Ec, the output of anti-phase termination first ozone sensor 16, the output of the first threshold values comparator OP1 through the first photoelectrical coupler PE1 in succession in controller.The end of oppisite phase of the second threshold values comparator OP2 inputs the second threshold voltage, this voltage is obtained by variable resistor RW2 dividing potential drop by power supply Ec, the output of homophase termination first differential pressure pickup 16, the output of the second threshold values comparator OP2 through the second photoelectrical coupler PE2 in succession in controller.In-phase end input the 3rd threshold voltage of the 3rd threshold values comparator OP3, this voltage is obtained by variable resistor RW3 dividing potential drop by power supply Ec, the output of anti-phase termination second differential pressure pickup 17, the output of the 3rd threshold values comparator OP1 through the 3rd photoelectrical coupler PE3 in succession in controller.End of oppisite phase input the 4th threshold voltage of the 4th threshold values comparator OP4, this voltage is obtained by variable resistor RW4 dividing potential drop by power supply Ec, the output of positive termination second differential pressure pickup 17, the output of the 4th threshold values comparator OP4 through the 4th photoelectrical coupler PE4 in succession in controller.
First driver comprises transistor TR1, resistance R1 and diode D1, and wherein the base stage of transistor TR1 is connected to controller through resistance R1, grounded emitter, and colelctor electrode connects the positive pole of diode D1.The negative pole of diode D1 connects power supply, and the two ends of diode D1 and the line bag of relay J 1 are in parallel.The first end of the power supply of one termination AC220V of the normally opened contact of relay J 1, a terminal of another termination ultraviolet lamp 6, another terminal of ultraviolet lamp 6 connects the second end of the power supply of AC220V.When user needs ultraviolet lamp 6 luminous, when pressing AN1, processor is checked through the signal pressing AN1, a high potential signal is provided to the base stage of transistor TR1, transistor turns, the line of the relay J 1 be connected with its colelctor electrode is surrounded by electric current to be passed through, and its normally opened contact closes, and ultraviolet lamp 6 connects AC220V power supply and luminous; When user does not need ultraviolet lamp 6 luminous, when will press AN1 again, processor is checked through the signal pressing AN1, a low-potential signal is provided to the base stage of transistor TR1, transistor cutoff, the line bag of the relay J 1 be connected with its colelctor electrode does not have electric current to pass through, and its normally opened contact disconnects, and ultraviolet lamp 6 and AC220V power supply disconnect.
Second driver comprises transistor TR2, resistance R2 and diode D2, and wherein the base stage of transistor TR2 is connected to controller through resistance R2, grounded emitter, and colelctor electrode connects the positive pole of diode D2.The negative pole of diode D2 connects power supply, and the two ends of diode D2 and the line bag of relay J 2 are in parallel.The first end of the power supply of one termination AC220V of the normally opened contact of relay J 2, a terminal of another termination ultraviolet lamp 7, another terminal of ultraviolet lamp 7 connects the second end of the power supply of AC220V.When user needs ultraviolet lamp 7 luminous, when pressing AN2, processor is checked through the signal pressing AN2, a high potential signal is provided to the base stage of transistor TR2, transistor turns, the line of the relay J 2 be connected with its colelctor electrode is surrounded by electric current to be passed through, and its normally opened contact closes, and ultraviolet lamp 7 connects AC220V power supply and luminous; When user does not need ultraviolet lamp 7 luminous, when will press AN2 again, processor is checked through the signal pressing AN2, a low-potential signal is provided to the base stage of transistor TR2, transistor cutoff, the line bag of the relay J 2 be connected with its colelctor electrode does not have electric current to pass through, and its normally opened contact disconnects, and ultraviolet lamp 7 and AC220V power supply disconnect.
3rd driver comprises transistor TR3, resistance R3 and diode D3, and wherein the base stage of transistor TR3 is connected to controller through resistance R3, grounded emitter, and colelctor electrode connects the positive pole of diode D3.The negative pole of diode D3 connects power supply, and the two ends of diode D3 and the line bag of relay J 3 are in parallel.The first end of the power supply of one termination AC220V of the normally opened contact of relay J 3, a terminal of another termination illuminating lamp 28, another terminal of illuminating lamp 28 connects the second end of the power supply of AC220V.When user needs illuminating lamp 28 luminous, when pressing AN3, processor is checked through the signal pressing AN3, a high potential signal is provided to the base stage of transistor TR3, transistor turns, the line of the relay J 3 be connected with its colelctor electrode is surrounded by electric current to be passed through, and its normally opened contact closes, and AC220V power supply and luminous connected by illuminating lamp 28; When user does not need illuminating lamp 28 luminous, when will press AN3 again, processor is checked through the signal pressing AN3, a low-potential signal is provided to the base stage of transistor TR3, transistor cutoff, the line bag of the relay J 3 be connected with its colelctor electrode does not have electric current to pass through, and its normally opened contact disconnects, and illuminating lamp 28 and AC220V power supply disconnect.
Four-wheel drive device comprises transistor TR4, resistance R4 and diode D4, and wherein the base stage of transistor TR4 is connected to controller through resistance R4, grounded emitter, and colelctor electrode connects the positive pole of diode D4.The negative pole of diode D4 connects power supply, and the two ends of diode D4 and the line bag of relay J 4 are in parallel.The first end of the power supply of one termination AC220V of the normally opened contact of relay J 4, the other end is given a dinner for a visitor from afar a terminal of machine 4, and another terminal of blower fan 4 connects the second end of the power supply of AC220V.When user needs blower fan 4 to work, when pressing AN4, processor is checked through the signal pressing AN4, a high potential signal is provided to the base stage of transistor TR4, transistor turns, the line of the relay J 4 be connected with its colelctor electrode is surrounded by electric current to be passed through, and its normally opened contact closes, and AC220V power supply and luminous connected by blower fan 4; When user does not need blower fan 4 to work, when will press AN4 again, processor is checked through the signal pressing AN4, a low-potential signal is provided to the base stage of transistor TR4, transistor cutoff, the line bag of the relay J 4 be connected with its colelctor electrode does not have electric current to pass through, and its normally opened contact disconnects, and blower fan 4 and AC220V power supply disconnect.In the present invention, have employed negative-feedback circuit to control the rotating speed of blower fan 4, by the leeway between differential pressure pickup detection blast air channel and clean room, the voltage that differential pressure pickup exports is u
3, this voltage is amplified by operational amplifier OP6.RW5 dividing potential drop is obtained the voltage U on Ec-1 and is amplified by operational amplifier OP5.Above-mentioned two voltages receive in-phase end and the end of oppisite phase of error amplifier respectively through two of similar resistance resistance; If u
3be greater than U, then error amplifier exports positive voltage signal, and this positive voltage signal is input to variable-frequency governor through proportion adjustment integrator integration, and the frequency of the power supply that variable-frequency governor exports reduces, and the rotating speed of blower fan is reduced; If u
3equal U, then error amplifier exports is zero, the frequency not step-down of the power supply that variable-frequency governor exports, and the rotating speed of blower fan falls constant; If u
3be less than U, then error amplifier exports negative voltage signal, and this negative voltage signal is input to variable-frequency governor through proportion adjustment integrator integration, and the frequency of the power supply that variable-frequency governor exports improves, and the rotating speed of blower fan is improved.
Transistor TR5 and resistance R5 is comprised for driving the drive circuit of alarm, wherein the base stage TR5 of transistor TR5 is connected to controller through resistance R5, grounded emitter, colelctor electrode connects one end of buzzer (alarm), another termination power of buzzer.The signal that first differential pressure pickup 16 exports by the first threshold values comparator OP1 and the first threshold values compare, when the signal that differential pressure pickup 16 exports is greater than the first threshold values, comparator OP1 exports low-potential signal, LEDs ON in first photoelectrical coupler PE1 and luminous, photoelectric tube conducting in photoelectrical coupler PE1, first input of processor obtains a low-potential signal, signal is sent to alarm and display after processor obtains this low-potential signal, make alarm equipment alarm, display is made to show the printed words of exhaust-air filter 10 inefficacy, when the signal that differential pressure pickup 16 exports is less than the first threshold values, comparator OP1 exports high potential signal, light emitting diode cut-off in first photoelectrical coupler PE1, photoelectric tube cut-off in photoelectrical coupler PE1, first input of processor obtains a high potential signal, the signal that first differential pressure pickup 16 exports by the second threshold values comparator OP2 and the second threshold values compare, when the signal that differential pressure pickup exports is less than the second threshold values, comparator OP2 exports low-potential signal, LEDs ON in second photoelectrical coupler PE2 and luminous, photoelectric tube conducting in photoelectrical coupler PE2, second input of processor obtains a low-potential signal, signal is sent to alarm and display after processor receives this low-potential signal, make alarm equipment alarm, display is made to show the printed words of exhaust-air filter 10 breakage, when the signal that the first differential pressure pickup exports is greater than the second threshold values, comparator OP2 exports high potential signal, light emitting diode cut-off in second photoelectrical coupler PE2, photoelectric tube cut-off in photoelectrical coupler PE1, second input of processor obtains a high potential signal.
The signal that second differential pressure pickup 17 exports by the 3rd threshold values comparator OP3 and the 3rd threshold values compare, when the signal that differential pressure pickup 17 exports is greater than the 3rd threshold values, comparator OP3 exports low-potential signal, LEDs ON in photoelectrical coupler PE3 and luminous, photoelectric tube conducting in photoelectrical coupler PE3, 3rd input of processor obtains a low-potential signal, signal is sent to alarm and display after processor obtains this low-potential signal, make alarm equipment alarm, display is made to show the printed words of main filter 11 inefficacy, when the signal that differential pressure pickup 17 exports is less than the 3rd threshold values, comparator OP3 exports high potential signal, light emitting diode cut-off in photoelectrical coupler PE3, photoelectric tube cut-off in photoelectrical coupler PE3, 3rd input of processor obtains a high potential signal, the signal that second differential pressure pickup 17 exports by the 4th threshold values comparator OP4 and the 4th threshold values compare, when the signal that differential pressure pickup 17 exports is less than the 4th threshold values, comparator OP4 exports low-potential signal, LEDs ON in 4th photoelectrical coupler PE4 and luminous, photoelectric tube conducting in photoelectrical coupler PE4, 4th input of processor obtains a low-potential signal, signal is sent to alarm and display after processor receives this low-potential signal, make alarm equipment alarm, display is made to show the printed words of main filter 11 breakage, when the signal that the second differential pressure pickup exports is greater than the 4th threshold values, comparator OP2 exports high potential signal, light emitting diode cut-off in 4th photoelectrical coupler PE4, photoelectric tube cut-off in photoelectrical coupler PE4, 4th input of processor obtains a high potential signal.
Control system provided by the invention also comprises the stepper motor driver for Driving Stepping Motor 24, and it is connected with controller by photoelectrical coupler.When user needs to open retractable door, user presses AN5, after processor receives the signal of AN5 connection, there is provided the pulse signal of rotating forward to stepper motor driver through photoelectrical coupler, motor rotates forward, and it drives retractable door to move up, at this moment Hall switch KH1 and KL1 all disconnects, at this moment continue to press AN5, motor continues to rotate forward, and retractable door continues to move up; When moving to topmost, the magnet steel in retractable door is aimed at Hall switch KH1, and KH1 connects, and processor does not provide signal through photoelectrical coupler to stepper motor driver after receiving this signal, and stepper motor is quit work.When user needs semi-closure retractable door, user presses AN6, after processor receives the signal of AN6 connection, there is provided the pulse signal of reversion to stepper motor driver through photoelectrical coupler, motor reversal, it drives retractable door to move down, at this moment Hall switch KH1 and KL1 all disconnects, at this moment continue to press AN6, motor continues reversion, and retractable door continues to move down; When moving to bottom, the magnet steel in retractable door is aimed at Hall switch KL1, and KL1 connects, and processor does not provide signal through photoelectrical coupler to stepper motor driver after receiving this signal, and stepper motor is quit work.Between voltage-stabilized power supply and AC220V power supply, arrange K switch H2 and KL2, be to prevent, when control signal is inoperative, and positive closing power supply.
Below by reference to the accompanying drawings, operation principle of the present invention is described in detail.But those of ordinary skill in the art it should be understood that description is only for explaining claims.But protection scope of the present invention is not limited to description.Any those skilled in the art of being familiar with are in the technical scope that the present invention discloses, and the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (1)
1. a clean biological safety cabinet control system, described safety cabinet comprises housing, operating room is provided with in housing, clean room and air circulation system, wherein, clean room is arranged on operating room, air circulation system is used for circulating air between operating room and clean room, air circulation system comprises the blower fan of the air inlet being arranged on clean room, it is characterized in that, air inlet in clean room is also disposed with the first ultraviolet lamp and the first photocatalyst layer, the first ozone decomposed layer is disposed with at exhaust outlet place, exhaust-air filter and the second photocatalyst layer, the second ozone decomposed layer is disposed with between operating room and clean room, main filter and the 3rd photocatalyst layer, in clean room, the direction of vertical first ultraviolet lamp is provided with the second ultraviolet lamp, on the left wall of clean room, the place corresponding with the air outlet place of the second photocatalyst layer is provided with distinguished and admirable guide way, described distinguished and admirable guide way is top is that semicircle is spherical, bottom is columniform combination, described control system is also provided with the first differential pressure pickup, leeway amplifier, error amplifier, proportional integrator and variable-frequency governor, two probes of the first differential pressure pickup are separately positioned in negative pressure air channel and clean room, the voltage signal that leeway amplifier exports for amplifying the first differential pressure pickup, the signal of telecommunication that error amplifier increased drawdown sensor exports, proportional integrator carries out integration to the signal that error amplifier exports and is supplied to variable-frequency governor, variable-frequency governor provides Frequency power supply to change to make the rotating speed of blower fan according to inputted signal fan, described control system also comprises the second differential pressure pickup, first threshold values comparator and the second threshold values comparator, two detecting heads of the second differential pressure pickup are separately positioned on the both sides of primary filter, the in-phase end of the first threshold values comparator (OP1) inputs the first threshold voltage, this first threshold voltage is obtained by the first variable resistor (RW1) dividing potential drop by power supply (Ec), the output of anti-phase termination second differential pressure pickup (16), the output of the first threshold values comparator (OP1) through the first photoelectrical coupler (PE1) in succession in controller, the end of oppisite phase of the second threshold values comparator (OP2) inputs the second threshold voltage, this second threshold voltage is obtained by the second adjustable resistance (RW2) dividing potential drop by power supply (Ec), the output of homophase termination second differential pressure pickup (16), the output of the second threshold values comparator (OP2) through the second photoelectrical coupler (PE2) in succession in controller, first threshold values comparator is used for the signal that exported by the second differential pressure pickup and the first threshold values compares, when inputted signal is greater than the first threshold values, processor sends signal to alarm and display, make alarm equipment alarm, display is made to show the printed words of primary filter inefficacy, second threshold values comparator is used for the signal that exported by the second differential pressure pickup and the second threshold values compares, when inputted signal is less than the second threshold values, processor sends signal to alarm and display, makes alarm equipment alarm, makes display show the printed words of primary filter breakage.
2. clean biological safety cabinet control system according to claim 1, it is characterized in that, described control system also comprises the 3rd differential pressure pickup, 3rd threshold values comparator and the 4th threshold values comparator, two detecting heads of the 3rd differential pressure pickup are separately positioned on the both sides of main filter, wherein, 3rd threshold values comparator is used for the signal that exported by the 3rd differential pressure pickup and the 3rd threshold values compares, when inputted signal is greater than the 3rd threshold values, processor sends signal to alarm and display, make alarm equipment alarm, display is made to show the printed words of main filter failure, 4th threshold values comparator is used for the signal that exported by the 3rd differential pressure pickup and the 4th threshold values compares, when inputted signal is less than the 4th threshold values, processor sends signal to alarm and display, makes alarm equipment alarm, makes display show the printed words of main filter breakage.
3. clean biological safety cabinet control system according to claim 2, is characterized in that, first, second, and third photocatalyst layer all has cellular through hole, and the surface of described cellular through hole is coated with titanium dioxide granule.
4. clean biological safety cabinet control system according to claim 3, described first ozone decomposed layer and the second ozone decomposed layer have multiple cellular through hole, the surface of each through hole are coated with manganese dioxide particle.
5. a Biohazard Safety Equipment, described safety cabinet comprises housing, operating room is provided with in housing, clean room, air circulation system and control system, wherein, operating room is provided with glass retractable door, clean room is arranged on operating room, air circulation system is used for circulating air between operating room and clean room, air circulation system comprises the blower fan being arranged on clean room's air inlet, it is characterized in that, the first ultraviolet lamp and the first photocatalyst layer is disposed with at the air intake vent place of clean room, the first ozone decomposed layer is disposed with at exhaust outlet place, exhaust-air filter and the second photocatalyst layer, the second ozone decomposed layer is disposed with between operating room and clean room, main filter and the 3rd photocatalyst layer, in clean room, the direction of vertical first ultraviolet lamp is provided with the second ultraviolet lamp, on the left wall of clean room, the place corresponding with the air outlet of the second photocatalyst layer is provided with distinguished and admirable guide way, described distinguished and admirable guide way is top is that semicircle is spherical, bottom is columniform combination, described control system comprises upper limit Hall switch (KH1) and lower limit Hall switch (KL1), upper limit Hall switch (KH1) is arranged on the upper end of operating room, lower limit Hall switch (KL1) is arranged on the lower end of operating room, the lower end of glass retractable door is provided with magnet steel, and when door closes operating room, magnet steel is aimed at lower limit Hall switch (KL1).
6. Biohazard Safety Equipment according to claim 5, is characterized in that, first, second, and third photocatalyst layer all has cellular through hole, on photocatalyst layer cellular through hole surface on be coated with titanium dioxide granule.
7. Biohazard Safety Equipment according to claim 6, is characterized in that, described first ozone decomposed layer and the second ozone decomposed layer have multiple cellular through hole, the surface of the through hole of ozone decomposed layer are coated with manganese dioxide particle.
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| CN201310086478.6A CN103223356B (en) | 2013-03-19 | 2013-03-19 | Clean biological safety cabinet control system |
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| CN201310086478.6A CN103223356B (en) | 2013-03-19 | 2013-03-19 | Clean biological safety cabinet control system |
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| CN103223356B true CN103223356B (en) | 2015-05-20 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104437684A (en) * | 2014-12-01 | 2015-03-25 | 上海力申科学仪器有限公司 | Biological safety cabinet for monitoring filter leakage in real time |
| CN104437685A (en) * | 2014-12-03 | 2015-03-25 | 上海力申科学仪器有限公司 | Biological safety cabinet capable of monitoring cleanliness in real time |
| CN108426326A (en) * | 2018-05-14 | 2018-08-21 | 北方工业大学 | Communication circuit of thing networking photocatalyst air purification device |
| JP2020198839A (en) * | 2019-06-12 | 2020-12-17 | 清水建設株式会社 | Culture device |
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Address after: 201607 Shanghai Songjiang District City Maogang town of strong Road No. 599 Patentee after: Shanghai Boxun Medical Biological Instrument Corp. Address before: 200071, room 9, 909 floor, Shen Shen building, No. 198, Shanghai, Zhongshan Road Patentee before: SHANGHAI BOXUN INDUSTRY & COMMERCE Co.,Ltd. |
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Denomination of invention: Clean biological safety cabinet control system Effective date of registration: 20231221 Granted publication date: 20150520 Pledgee: Shanghai Rural Commercial Bank Co.,Ltd. Songjiang sub branch Pledgor: Shanghai Boxun Medical Biological Instrument Corp. Registration number: Y2023310000904 |
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