CN115662072A - Dustproof and excessive harmful gas intelligent alarm system for laboratory ventilation cabinet - Google Patents
Dustproof and excessive harmful gas intelligent alarm system for laboratory ventilation cabinet Download PDFInfo
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- 230000007246 mechanism Effects 0.000 claims abstract description 51
- 238000000556 factor analysis Methods 0.000 claims abstract description 23
- 238000013500 data storage Methods 0.000 claims abstract description 19
- 239000000428 dust Substances 0.000 claims abstract description 11
- 230000002265 prevention Effects 0.000 claims abstract description 8
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- 238000000034 method Methods 0.000 claims description 22
- 230000000630 rising effect Effects 0.000 claims description 20
- 238000009434 installation Methods 0.000 claims description 19
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- 239000011425 bamboo Substances 0.000 claims description 8
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 2
- 239000003546 flue gas Substances 0.000 abstract description 2
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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Abstract
The invention belongs to the technical field of fume hoods, and particularly relates to an intelligent alarm system for dust prevention and excessive harmful gas of a laboratory fume hood, which comprises a laboratory fume hood, wherein the laboratory fume hood comprises a fume hood body, a hood body top plate is fixedly arranged at the top of the fume hood body, a dust opening and closing mechanism and a control panel are installed on the front side of the fume hood body, the control panel comprises a processor, a data storage module, a harmful gas early warning feedback module, an auxiliary variable analysis module and a multi-factor analysis regulation module, an exhaust assembly is installed on the laboratory fume hood, and the exhaust assembly consists of a main exhaust mechanism and an auxiliary exhaust mechanism; the invention not only can monitor and analyze harmful gas and variable factors in the fume hood body, but also can accurately reflect the whole condition of the internal environment of the fume hood by combining the harmful gas condition and the temperature flue gas condition in the fume hood, thereby realizing automatic and reasonable regulation and control of the air exhaust operation of the fume hood and improving the intelligent degree of the laboratory fume hood.
Description
Technical Field
The invention relates to the technical field of fume hoods, in particular to an intelligent alarm system for dust prevention and excessive harmful gas of a laboratory fume hood.
Background
The fume hood is commonly used in a laboratory, is an indispensable component in the ventilation design of the laboratory, and is mainly used for preventing laboratory workers from inhaling or seldom inhaling some toxic, sick or unknown toxic chemical substances and organisms;
the Chinese patent with the publication number of CN213316728U discloses a laboratory fume hood, which is characterized in that a second door frame is actively limited by arranging a compression spring and a locking block, so that potential safety hazards are reduced, the normal lifting of the second door frame is not influenced while the second door frame is actively limited by arranging a cam, a rotating shaft and a transmission rod, the failure rate of the fume hood is greatly reduced, the trouble of later maintenance is saved, and the working efficiency of the fume hood is indirectly improved;
however, harmful gas inside the fume hood cannot be monitored in the actual use process, the harmful gas condition and the temperature smoke condition inside the fume hood are difficult to combine and comprehensively measure and judge the overall condition of the internal environment of the fume hood, automatic and reasonable regulation and control of the air exhaust operation of the fume hood based on the comprehensive measurement and judgment result cannot be realized, the intelligent degree of the fume hood in a laboratory is not improved, and the safety of the fume hood in the laboratory in the operation process is difficult to ensure;
in view of the above technical drawbacks, a solution is proposed.
Disclosure of Invention
The invention aims to provide an intelligent dustproof and excessive harmful gas alarm system for a laboratory fume hood, which solves the problems that harmful gas in the fume hood cannot be monitored, the harmful gas condition and the temperature smoke condition in the fume hood are difficult to combine and comprehensively measure and judge the overall condition of the internal environment of the fume hood, and automatic and reasonable regulation and control of the air exhaust operation of the fume hood based on the comprehensive measurement and judgment result cannot be realized in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
the intelligent alarm system for preventing dust and excessive harmful gas of the laboratory fume hood comprises the laboratory fume hood, wherein the laboratory fume hood comprises a fume hood body and a hood body bearing plate, the fume hood body is fixedly arranged at the top of the hood body bearing plate through bolts, a hood body top plate is fixedly arranged at the top of the fume hood body, an opening and closing dustproof mechanism and a control panel are arranged on the front side of the fume hood body, a gas detection sensor group, a smoke sensor and a temperature sensor are arranged inside the fume hood body, and the gas detection sensor group, the smoke sensor and the temperature sensor are respectively in communication connection with the control panel; the control panel comprises a processor, a data storage module, a hazardous gas early warning feedback module, an auxiliary variable analysis module and a multi-factor analysis regulation and control module, and the processor is in communication connection with the data storage module, the hazardous gas early warning feedback module, the auxiliary variable analysis module and the multi-factor analysis regulation and control module;
an air exhaust assembly is arranged on the laboratory ventilation cabinet and consists of a main air exhaust mechanism and an auxiliary air exhaust mechanism; the main exhaust mechanism comprises an exhaust driving motor fixedly arranged in a top plate of the cabinet body through a motor base and a main exhaust box fixed at the top of the top plate of the cabinet body through bolts, a main exhaust pipe is installed at the top of the main exhaust box, the cabinet body of the fume hood is communicated with the main exhaust box through a pipeline, a main rotating shaft is rotatably arranged in the main exhaust box through a bearing, the output end of the exhaust driving motor is connected with one end of the main rotating shaft, and main exhaust fan blades are fixedly arranged on the outer peripheral surface of the main rotating shaft;
the auxiliary exhaust mechanisms are positioned on two sides of the cabinet body of the fume hood, each auxiliary exhaust mechanism comprises an auxiliary exhaust box fixedly arranged on the outer side of the cabinet body of the fume hood through a bolt, one side of each auxiliary exhaust box is communicated with the cabinet body of the fume hood through a pipeline, and an auxiliary exhaust pipe is arranged on the other side of each auxiliary exhaust box; the auxiliary exhaust box is rotatably provided with an auxiliary rotating shaft penetrating through the top of the auxiliary exhaust box, auxiliary exhaust fan blades are fixedly arranged on the part, located in the auxiliary exhaust box, of the auxiliary rotating shaft, and the auxiliary rotating shaft and the main rotating shaft are driven through a self-adjusting transmission mechanism.
Further, the processor generates a harmful gas analysis signal and sends the harmful gas analysis signal to the harmful gas early warning feedback module, the harmful gas early warning feedback module analyzes harmful gas in the laboratory ventilation cabinet after receiving the harmful gas analysis signal, and generates a gas danger early warning signal Yj1 or Yj2 through analysis and sends the gas danger early warning signal Yj1 or Yj2 to the processor;
the processor generates a variable analysis signal and sends the variable analysis signal to the auxiliary variable analysis module, the auxiliary variable analysis module performs variable analysis on the inside of the laboratory fume hood after receiving the variable analysis signal, generates a danger-changing early warning signal Bj1 or Bj2 through analysis, and sends the danger-changing early warning signal Bj1 or Bj2 to the processor;
after receiving the gas risk early warning signal Yj1 or Yj2 and the danger-changing early warning signal Bj1 or Bj2, the processor generates a multi-factor comprehensive judgment signal and sends the gas risk early warning signal Yj1 or Yj2, the danger-changing early warning signal Bj1 or danger-changing early warning signal Bj2 and the multi-factor comprehensive judgment signal to the multi-factor analysis and control module, the multi-factor analysis and control module receives the multi-factor comprehensive judgment signal and then carries out comprehensive measurement and judgment to generate a fast regulation and control signal, a slow regulation and control signal or an intermediate speed regulation and control signal, and sends the fast regulation and control signal, the slow regulation and control signal or the intermediate speed regulation and control signal to the processor;
the processor receives the rapid regulation and control signal and then sends a III-level air exhaust instruction to the air exhaust assembly, the processor receives the medium-speed regulation and control signal and then sends a II-level air exhaust instruction to the air exhaust assembly, the processor receives the slow regulation and control signal and then sends a I-level air exhaust instruction to the air exhaust assembly, and the air exhaust efficiency of the III-level air exhaust instruction is greater than that of the II-level air exhaust instruction and that of the I-level air exhaust instruction.
Further, the specific operation process of the hazardous gas early warning feedback module comprises the following steps:
calling a name of hazardous gas to be monitored in the operation of a laboratory fume hood through a data storage module, and marking the hazardous gas to be monitored as i, i = {1,2,3, \8230;, n }, wherein n is the number of the hazardous gas to be monitored and n is a positive integer greater than 1;
setting a detection time interval j, j = {1,2,3, \8230m }, m is a positive integer larger than 1, and the time intervals of two adjacent groups of detection time intervals are the same by taking the current starting running time of the laboratory fume hood as a starting time; collecting concentration data of the hazardous gas i to be monitored in a detection time period j, and marking the concentration data of the hazardous gas i to be monitored in the detection time period j as an actual concentration value Dij;
calling a preset concentration threshold value of hazardous gas i to be monitored through a data storage module, marking the preset concentration threshold value of the hazardous gas i to be monitored as Ti, and enabling the preset concentration threshold value Ti to correspond to the hazardous gas i to be monitored and the real concentration value Dij one by one;
respectively comparing the real concentration value Dij of the hazardous gas i to be monitored with the corresponding preset concentration threshold value Ti, and if one real concentration value Dij of the hazardous gas i to be monitored is greater than or equal to the corresponding preset concentration threshold value Ti, generating a gas risk early warning signal Yj1;
if the real concentration values Dij of the hazardous gas i to be monitored are smaller than the corresponding preset concentration threshold value Ti, carrying out gas danger analysis based on the real concentration values Dij of the hazardous gas i to be monitored and the corresponding preset concentration threshold value Ti, and generating a gas danger early warning signal Yj1 or Yj2 through the gas danger analysis;
and sending the gas risk early warning signal Yj1 or Yj2 to a processor.
Further, the specific process of the gas risk analysis is as follows:
calculating the difference value between a preset concentration threshold value Ti and the real concentration value Dij of the harmful gas i to be monitored to obtain a gas deviation value CZij corresponding to the detection time period;
distributing corresponding weight coefficients to the hazardous gas i to be monitored, and marking the weight coefficients of the hazardous gas i to be monitored as Ri; multiplying the gas deviation value CZij of the hazardous gas i to be monitored in the detection time period by the corresponding weight coefficient Ri, and marking the sum of the products in each group as a gas hazardous value QWj;
acquiring a gas danger threshold value through a data storage module, comparing the gas danger value QWj with the gas danger threshold value, and generating a gas danger early warning signal Yj2 if the gas danger value QWj is larger than the gas danger threshold value; and if the gas danger value QWj is smaller than or equal to the gas danger threshold value, generating a gas danger early warning signal Yj1.
Further, the specific operation process of the auxiliary variable analysis module includes:
distributing weight coefficients er1 and er2 to the temperature coefficient WXj and the smoke coefficient YXj through analyzing and acquiring the temperature coefficient WXj and the smoke coefficient YXj of the detection time period j, and analyzing and calculating through a formula BWj = (WXj. Er1+ YXj. Er 2)/(er 1+ er 2) to obtain a danger-variable value BWj;
calling a danger-changing threshold value through a data storage module, comparing the danger-changing value BWj with the value of the danger-changing threshold value, generating a danger-changing early warning signal Bj1 if the danger-changing value BWj is greater than or equal to the danger-changing threshold value, and generating a danger-changing early warning signal Bj2 if the danger-changing value BWj is smaller than the danger-changing threshold value;
and sending the danger-variable early warning signal Bj1 or danger-variable early warning signal Bj2 to a processor.
Further, the analysis and acquisition method of the temperature and shadow coefficient WXj is as follows:
acquiring a temperature value of a current detection time interval and a temperature value of an adjacent previous detection time interval in a laboratory fume hood, judging whether the laboratory fume hood is in a temperature rising state or a temperature falling state based on two groups of temperature values, acquiring a temperature rise rate when the laboratory fume hood is judged to be in the temperature rising state, and acquiring a temperature fall rate when the laboratory fume hood is judged to be in the temperature falling state; carrying out numerical analysis based on the temperature value in the current detection time period and combining the temperature rise rate or the temperature drop rate to obtain a temperature shadow coefficient WXj;
the method for analyzing and acquiring the smoke shadow coefficient YXj comprises the following steps:
acquiring a smoke concentration value of a current detection period and a smoke concentration value of an adjacent previous detection period in a laboratory fume hood, judging whether the laboratory fume hood is in a smoke concentration rising state or a smoke concentration falling state based on the two groups of smoke concentration values, acquiring a smoke rising rate when the laboratory fume hood is judged to be in the smoke concentration rising state, and acquiring a smoke falling rate when the laboratory fume hood is judged to be in the smoke concentration falling state; and carrying out numerical analysis based on the smoke concentration value of the current detection time period and combining the smoke rising rate or the smoke falling rate to obtain a smoke shadow coefficient YXj.
Further, the processor sends the gas risk early warning signal Yj1 or Yj2 and the danger-variable early warning signal Bj1 or danger-variable early warning signal Bj2 to the multi-factor analysis and regulation module, when the multi-factor analysis and regulation module receives the gas risk early warning signal Yj1 or Yj2, the gas risk early warning signal Yj1 is marked as a symbol F-1, the gas risk early warning signal Yj2 is marked as a symbol F-2, and a gas risk early warning set { F-1, F-2} is established;
when the multi-factor analysis regulation and control module receives the danger-variable early warning signal Bj1 or the danger-variable early warning signal Bj2, calibrating the danger-variable early warning signal Bj1 as a symbol F-1, calibrating the danger-variable early warning signal Bj2 as a symbol F-2, and establishing a danger-variable early warning set { F-1, F-2};
performing set intersection analysis on the gas danger early warning set and the danger-variable early warning set, generating a rapid regulation and control signal if the gas danger early warning set is n-danger-variable early warning set = F-1, generating a slow regulation and control signal if the gas danger early warning set is n-danger-variable early warning set = F-2, and generating a medium-speed regulation and control signal in the rest cases; and sending the fast regulation and control signal, the slow regulation and control signal or the medium speed regulation and control signal to a processor.
Further, it includes the transparent sealing door that shelters from to the front opening of the fume chamber cabinet body to open and close dustproof mechanism, the fume chamber cabinet body openly sets up horizontal installation board near the rigidity at top, the last driving motor that opens and close that sets up of horizontal installation board through the motor cabinet is fixed, the bottom both sides of horizontal installation board are passed through the bearing and are rotated and set up vertical screw rod, and are two sets of vertical screw rod passes through the drive belt transmission and connects, and the output of opening and close driving motor and one of them a set of vertical screw rod and link to each other, the both sides of transparent sealing door are fixed and are set up the internal thread piece, and vertical screw rod and the internal thread piece threaded connection who corresponds.
Furthermore, the self-adjusting transmission mechanism comprises transverse transmission shafts which are rotatably arranged on two sides of the main air exhaust box through bearings, mounting blocks are fixedly arranged on two sides of a top plate of the cabinet body, the top end of the auxiliary rotating shaft upwards penetrates through the corresponding mounting blocks and is rotatably connected with the corresponding mounting blocks, first bevel gears are respectively arranged at one end of each transverse transmission shaft, which is far away from the main air exhaust box, and the top ends of the auxiliary rotating shafts, and the two groups of first bevel gears are meshed and connected;
one end and the spacing installation section of thick bamboo fixed connection that transverse transmission shaft is located main exhaust case, the fixed connecting spring that sets up in the spacing installation section of thick bamboo slides through the slide rail and sets up the annular movable block, and the other end and the annular movable block fixed connection of connecting spring, the fixed connecting axle that outwards wears out the spacing installation section of thick bamboo that sets up in one side of annular movable block dorsad connecting spring, all install second bevel gear on connecting axle and the main rotation axle, and two sets of second bevel gear meshing are connected, and the internal fixation of spacing installation section of thick bamboo sets up annular electromagnet.
Compared with the prior art, the invention has the beneficial effects that:
1. in the invention, harmful gas in a laboratory fume hood is analyzed through a harmful gas early warning feedback module, the harmful gas degree in the fume hood body is obtained through the harmful gas analysis, and a gas danger early warning signal Yj1 or Yj2 is generated based on the gas harmful degree and is sent to a processor, so that the monitoring and analysis of the harmful gas in the fume hood body are realized; carrying out variable analysis on the inside of a laboratory fume hood through an auxiliary variable analysis module based on temperature information and smoke information, obtaining variable hazard degree in the fume hood body through the variable analysis, generating a danger-changing early warning signal Bj1 or Bj2 based on the variable hazard degree, and sending the danger-changing early warning signal Bj1 or Bj2 to a processor, so as to realize monitoring analysis on variable factors in the fume hood body;
2. according to the invention, the comprehensive measurement and judgment is carried out by the multi-factor analysis and control module based on the gas danger early warning signal and the danger-variable early warning signal, a rapid regulation and control signal, a slow regulation and control signal or a medium speed regulation and control signal are generated and sent to the processor, and by combining and comprehensively analyzing the harmful gas condition and the temperature flue gas condition in the fume hood, the comprehensive analysis result can accurately reflect the overall condition of the internal environment of the fume hood, the intelligent degree of equipment is improved, and the safety of the equipment in use is ensured;
3. in the invention, the processor generates air exhaust instructions of different grades after receiving the slow speed regulation and control signal, the medium speed regulation and control signal or the fast speed regulation and control signal and controls the air exhaust assembly to exhaust air from the inside of the fume hood body according to different air exhaust modes based on the air exhaust instructions of different grades, thereby realizing automatic and reasonable regulation and control of the air exhaust operation of the fume hood, further improving the intelligent degree of the fume hood in a laboratory, and solving the problem that the energy waste or the internal environment cannot be quickly improved because the fume hood body always exhausts according to a single mode at present;
4. according to the invention, when the laboratory fume hood is in a non-working state or in an operation process, when the front opening of the fume hood body needs to be shielded, the opening and closing driving motor in the opening and closing dustproof mechanism enables the vertical screw rods connected with the opening and closing driving motor to rotate, the two groups of vertical screw rods rotate synchronously through the transmission belt, the transparent sealing door moves vertically downwards and seals the front opening of the fume hood body, and the dustproof and protective effects are achieved.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings;
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a schematic structural view of the main exhaust mechanism of the present invention;
FIG. 4 is a schematic view of the self-adjusting actuator of the present invention;
FIG. 5 is a system block diagram of a control panel according to the present invention;
FIG. 6 is a system block diagram of a processor and server according to the present invention;
FIG. 7 is an enlarged view of the opening and closing dustproof mechanism in FIG. 2;
FIG. 8 is a schematic top view of the opening and closing dust-proof mechanism of the present invention.
Reference numerals: 1. a fume hood body; 2. a cabinet body bearing plate; 3. a control panel; 4. a main exhaust mechanism; 5. an auxiliary exhaust mechanism; 6. a main exhaust duct; 7. an auxiliary exhaust duct; 8. a self-adjusting drive mechanism; 9. opening and closing the dustproof mechanism; 10. a cabinet top plate; 11. mounting a block; 12. a first bevel gear; 41. a main exhaust box; 42. an exhaust drive motor; 43. a main rotating shaft; 44. a main exhaust fan blade; 51. an auxiliary exhaust box; 52. an auxiliary rotating shaft; 53. auxiliary exhaust fan blades; 81. a transverse transmission shaft; 82. a connecting shaft; 83. a second bevel gear; 84. a limiting installation cylinder; 85. an annular movable block; 86. a connecting spring; 87. an annular electromagnet; 91. a transparent sealing door; 92. a horizontal mounting plate; 93. starting and stopping the driving motor; 94. a vertical screw; 95. an internal thread block; 96. a transmission belt.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
as shown in fig. 1-5, the intelligent alarm system for preventing dust and excessive harmful gas of a laboratory fume hood provided by the invention comprises a laboratory fume hood, wherein the laboratory fume hood comprises a fume hood body 1 and a hood body bearing plate 2, the fume hood body 1 is fixedly arranged at the top of the hood body bearing plate 2 through bolts, a plurality of groups of rollers are fixedly arranged at the bottom of the hood body bearing plate 2, equipment can be conveniently moved and carried by arranging the rollers, a hood body top plate 10 is fixedly arranged at the top of the fume hood body 1, an exhaust assembly is arranged on the laboratory fume hood, and the exhaust assembly comprises a main exhaust mechanism 4 positioned above the fume hood body 1 and auxiliary exhaust mechanisms 5 positioned at two sides of the fume hood body 1;
the main exhaust mechanism 4 comprises an exhaust driving motor 42 fixedly arranged in the cabinet top plate 10 through a motor base and a main exhaust air box 41 fixed at the top of the cabinet top plate 10 through bolts, a main exhaust air pipe 6 is installed at the top of the main exhaust air box 41, the ventilation cabinet body 1 and the main exhaust air box 41 are communicated through a pipeline, a main rotating shaft 43 is rotatably arranged in the main exhaust air box 41 through a bearing, the output end of the exhaust driving motor 42 is connected with one end of the main rotating shaft 43, and main exhaust fan blades 44 are fixedly arranged on the outer peripheral surface of the main rotating shaft 43; when the air exhaust assembly receives an I-level air exhaust instruction, the air exhaust driving motor 42 operates at G1 power and enables the main rotating shaft 43 to rotate, the main exhaust fan blades 44 rotate along with the main rotating shaft 43, air in the ventilation cabinet body 1 upwards enters the main exhaust box 41, and the main exhaust pipe 6 exhausts the internal air to realize slow air exhaust;
the auxiliary exhaust mechanism 5 comprises an auxiliary exhaust box 51, the auxiliary exhaust box 51 is fixedly arranged on the outer side of the fume hood body 1 through bolts, one side of the auxiliary exhaust box 51 is communicated with the fume hood body 1 through a pipeline, and the other side of the auxiliary exhaust box 51 is provided with an auxiliary exhaust pipe 7; an auxiliary rotating shaft 52 penetrating the top of the auxiliary air exhaust box 51 is rotatably installed on the auxiliary air exhaust box 51, an auxiliary air exhaust fan blade 53 is fixedly arranged on the part of the auxiliary rotating shaft 52 positioned in the auxiliary air exhaust box 51, and the auxiliary rotating shaft 52 and the main rotating shaft 43 are driven by a self-adjusting transmission mechanism 8; when the exhaust assembly receives a second-level exhaust instruction or a third-level exhaust instruction, the exhaust driving motor 42 operates at G2 power or G3 power and rotates the main rotating shaft 43, the main exhaust fan blades 44 exhaust air and simultaneously rotate the two groups of auxiliary rotating shafts 52 through the self-adjusting transmission mechanism 8, and the auxiliary exhaust fan blades 53 on the two sides perform auxiliary exhaust air along with the auxiliary exhaust air, so that multi-part exhaust air is realized; g1 power is less than G2 power is less than G3 power;
specifically, the self-adjusting transmission mechanism 8 comprises a transverse transmission shaft 81, the transverse transmission shaft 81 is rotatably installed on two sides of the main air exhaust box 41 through bearings, the installation blocks 11 are fixedly arranged on two sides of the cabinet top plate 10, the top end of the auxiliary rotation shaft 52 upwards passes through the corresponding installation blocks 11 and is rotatably connected with the same, first bevel gears 12 are installed on one end of the transverse transmission shaft 81 far away from the main air exhaust box 41 and the top end of the auxiliary rotation shaft 52, and the two groups of first bevel gears 12 are in meshed connection; one end of the transverse transmission shaft 81, which is positioned in the main exhaust box 41, is fixedly connected with a limiting installation cylinder 84, a connecting spring 86 is fixedly arranged in the limiting installation cylinder 84, an annular movable block 85 is arranged in the limiting installation cylinder 84 in a sliding manner through a sliding rail, and the other end of the connecting spring 86 is fixedly connected with the annular movable block 85;
a connecting shaft 82 which penetrates out of the limiting installation cylinder 84 is fixedly arranged on one side of the annular movable block 85, which is back to the connecting spring 86, a second bevel gear 83 is arranged on both the connecting shaft 82 and the main rotating shaft 43, an annular electromagnet 87 is fixedly arranged in the limiting installation cylinder 84, and the annular movable block 85 is made of iron material; in the initial state or in the stage I air exhaust state, the annular electromagnet 87 is not electrified, the two groups of second bevel gears 83 are not meshed, and the connecting spring 86 is in an unstretched state; when the air exhaust mechanism is in a II-level air exhaust state or a III-level air exhaust state, the annular electromagnet 87 is electrified and generates magnetic attraction, the annular movable block 85 is adsorbed on the annular electromagnet 57 due to the action of the magnetic attraction and stretches the connecting spring 86, and the two groups of second bevel gears 83 are meshed and connected at the moment, so that synchronous air exhaust of the main air exhaust mechanism 4 and the auxiliary air exhaust mechanism 5 is finally realized.
The front side of the fume hood body 1 is provided with a control panel 3, a gas detection sensor group, a smoke sensor and a temperature sensor are arranged inside the fume hood body 1 and are respectively in communication connection with the control panel 3, the gas detection sensor group detects harmful gas concentration in the fume hood body 1, the smoke sensor detects smoke concentration in the fume hood body 1, and the temperature sensor detects temperature in the fume hood body 1; the control panel 3 comprises a processor, a data storage module, a hazardous gas early warning feedback module, an auxiliary variable analysis module and a multi-factor analysis regulation and control module, and the processor is in communication connection with the data storage module, the hazardous gas early warning feedback module, the auxiliary variable analysis module and the multi-factor analysis regulation and control module;
the processor generates a hazardous gas analysis signal and sends the hazardous gas analysis signal to the hazardous gas early warning feedback module, the hazardous gas early warning feedback module analyzes hazardous gas in a laboratory ventilation cabinet after receiving the hazardous gas analysis signal, and generates a gas danger early warning signal Yj1 or Yj2 through analysis and sends the gas danger early warning signal Yj1 or Yj2 to the processor; the specific operation process of the hazardous gas early warning feedback module is as follows:
s1, calling a name of hazardous gas to be monitored in the operation of a laboratory fume hood through a data storage module, and marking the hazardous gas to be monitored as i, i = {1,2,3, \8230, n }, wherein n is the number of the gas to be monitored and n is a positive integer greater than 1;
s2, setting a detection time interval j, j = {1,2,3, \8230, m } by taking the current starting running time of the laboratory fume hood as a starting time, wherein m is a positive integer greater than 1, and the time intervals of two adjacent groups of detection time intervals are the same; collecting concentration data of the hazardous gas i to be monitored in a detection time period j, and marking the concentration data of the hazardous gas i to be monitored in the detection time period j as an actual concentration value Dij;
s3, calling a preset concentration threshold of the hazardous gas i to be monitored through a data storage module, marking the preset concentration threshold of the hazardous gas i to be monitored as Ti, and enabling the preset concentration threshold Ti to be in one-to-one correspondence with the hazardous gas i to be monitored and the real concentration value Dij;
s4, respectively comparing the real concentration value Dij of the hazardous gas i to be monitored with a corresponding preset concentration threshold value Ti;
step S41, if one of the real concentration values Dij of the hazardous gas i to be monitored is greater than or equal to the corresponding preset concentration threshold value Ti, generating a gas hazard early warning signal Yj1;
step S42, if the actual concentration value Dij of the hazardous gas i to be monitored is smaller than the corresponding preset concentration threshold value Ti, performing gas danger analysis based on the actual concentration value Dij of the hazardous gas i to be monitored and the corresponding preset concentration threshold value Ti, wherein the specific process of the gas danger analysis is as follows:
calculating the difference value between a preset concentration threshold value Ti and the real concentration value Dij of the harmful gas i to be monitored to obtain a gas deviation value CZij corresponding to the detection time period;
distributing corresponding weight coefficients to the hazardous gas i to be monitored, and marking the weight coefficients of the hazardous gas i to be monitored as Ri; different weight coefficients are distributed according to the hazard degree of the hazardous gas, and the larger the numerical value of the weight coefficient corresponding to the hazardous gas is, the larger the hazard brought by the hazardous gas to the environment and the human health is;
multiplying the gas bias value CZij of the hazardous gas i to be monitored in the detection time period j by the corresponding weight coefficient Ri, and marking the sum of all groups of products as a gas hazardous value QWj; namely a gas danger value QWj = (CZ 1 j:R1 + CZ2 j:R2 + CZ3 j:82303 + \\8230; + CZnj:Rn); it should be noted that the gas risk value QWj is used for reflecting the overall gas risk degree of the current environment in the fume hood body 1, and the larger the value of the gas risk value QWj is, the larger the overall gas risk degree of the current internal environment is indicated;
the gas danger early warning method comprises the steps of calling a gas danger threshold through a data storage module, comparing a gas danger value QWj with the gas danger threshold, and generating a gas danger early warning signal Yj2 if the gas danger value QWj is larger than the gas danger threshold; if the gas danger value QWj is smaller than or equal to a gas danger threshold value, generating a gas danger early warning signal Yj1, namely generating a gas danger early warning signal Yj1 or Yj2 through gas danger analysis;
and S5, sending the gas danger early warning signal Yj1 or Yj2 to a processor.
The processor generates a variable analysis signal and sends the variable analysis signal to the auxiliary variable analysis module, the auxiliary variable analysis module performs variable analysis on the interior of the laboratory ventilation cabinet after receiving the variable analysis signal, generates a danger-variable early warning signal Bj1 or Bj2 through analysis, and sends the danger-variable early warning signal Bj1 or Bj2 to the processor; the specific operation process of the auxiliary variable analysis module is as follows:
t1, acquiring a temperature shadow coefficient WXj and a smoke shadow coefficient YXj of a detection time period j through analysis;
step T11, the method for analyzing and obtaining the temperature and shadow coefficient WXj is as follows:
acquiring a temperature value of a current detection time interval and a temperature value of an adjacent previous detection time interval in a laboratory fume hood, judging whether the laboratory fume hood is in a temperature rising state or a temperature falling state based on two groups of temperature values, acquiring a temperature rise rate when the laboratory fume hood is judged to be in the temperature rising state, and acquiring a temperature fall rate when the laboratory fume hood is judged to be in the temperature falling state;
carrying out numerical analysis based on the temperature value in the current detection time period and combining the temperature rise rate or the temperature drop rate to obtain a temperature shadow coefficient WXj, and marking the temperature value in the current detection time period as a real temperature value; when the temperature-rise state is in the temperature-fall state, WXj = a1 real temperature value + a2 temperature-rise rate, a1 and a2 are preset proportionality coefficients, and a1 > a2 > 0, and when the temperature-rise state is in the temperature-fall state, WXj = a1 real temperature value + a 3/temperature-fall rate, a1 and a3 are preset proportionality coefficients, and a1 > a3 > 0;
step T12, the method for analyzing and obtaining the smoke shadow coefficient YXj is as follows:
acquiring a smoke concentration value of a current detection period and a smoke concentration value of an adjacent previous detection period in a laboratory fume hood, judging whether the laboratory fume hood is in a smoke concentration rising state or a smoke concentration falling state based on the two groups of smoke concentration values, acquiring a smoke rising rate when the laboratory fume hood is judged to be in the smoke concentration rising state, and acquiring a smoke falling rate when the laboratory fume hood is judged to be in the smoke concentration falling state;
carrying out numerical analysis based on the smoke concentration value of the current detection time period and combining the smoke rising rate or the smoke falling rate to obtain a smoke shadow coefficient YXj, and marking the smoke concentration value of the current detection time period as an actual smoke value; when the smoke concentration is in a rising state, the smoke shadow coefficient YXj = b1 solid smoke value + b2 smoke rising rate, b1 and b2 are preset proportionality coefficients, and b1 is more than b2 and is more than 0, when the smoke concentration is in a falling state, the smoke shadow coefficient YXj = b1 solid smoke value + b3 is more than smoke falling rate, and b1 and b3 are preset proportionality coefficients, and b1 is more than b3 and is more than 0;
step T2, distributing weight coefficients er1 and er2 to the temperature coefficient WXj and the smoke coefficient YXj, and analyzing and calculating through a formula BWj = (WXj. Er1+ YXj. Er 2)/(er 1+ er 2) to obtain a danger-variable value BWj; wherein, the values of er1 and er2 are both larger than zero, and er1 is larger than er2;
it should be noted that the variable risk value BWj is in a direct proportion relationship with the values of the temperature coefficient WXj and the smoke coefficient YXj, and the larger the value of the temperature coefficient WXj is, the larger the value of the smoke coefficient YXj is, the larger the value of the variable risk value BWj is, which indicates that the degree of variable risk in the ventilation hood body 1 in the current detection period is greater;
step T3, calling a danger-variable threshold value through a data storage module, comparing the value of the danger-variable threshold value BWj with the value of the danger-variable threshold value, generating a danger-variable early warning signal Bj1 if the danger-variable value BWj is greater than or equal to the danger-variable threshold value, and generating a danger-variable early warning signal Bj2 if the danger-variable value BWj is smaller than the danger-variable threshold value;
and step T4, sending the danger-changing early warning signal Bj1 or danger-changing early warning signal Bj2 to a processor.
The above formulas are all calculated by taking the numerical value of the dimension, the formula is a formula of the latest real situation obtained by collecting a large amount of data and performing software simulation, the preset parameters in the formula are set by the technical personnel in the field according to the actual situation, the weight coefficient/the scale coefficient is a specific numerical value obtained by quantizing each parameter, and the subsequent comparison is convenient, and the proportional relation between the parameter and the quantized numerical value is not influenced as long as the size of the weight coefficient/the scale coefficient is large.
After receiving the gas danger early warning signal Yj1 or Yj2 and the danger-changing early warning signal Bj1 or Bj2, the processor generates a multi-factor comprehensive judgment signal and sends the gas danger early warning signal Yj1 or Yj2, the danger-changing early warning signal Bj1 or danger-changing early warning signal Bj2 and the multi-factor comprehensive judgment signal to the multi-factor analysis and control module, and the multi-factor analysis and control module receives the multi-factor comprehensive judgment signal and then carries out comprehensive measurement and judgment; the specific process is as follows:
step U1, a multi-factor analysis and regulation module receives a gas danger early warning signal Yj1 or Yj2, the gas danger early warning signal Yj1 is marked as a symbol F-1, the gas danger early warning signal Yj2 is marked as a symbol F-2, and a gas danger early warning set { F-1, F-2} is established;
step U2, the multi-factor analysis and regulation module receives the danger-changing early warning signal Bj1 or the danger-changing early warning signal Bj2, the danger-changing early warning signal Bj1 is marked as a symbol F-1, the danger-changing early warning signal Bj2 is marked as a symbol F-2, and a danger-changing early warning set { F-1, F-2} is established;
step U3, carrying out set intersection analysis on the gas danger early warning set and the danger-variable early warning set, and generating a rapid regulation and control signal if the gas danger early warning set is n-shaped (n-shaped) and the danger-variable early warning set is = F-1; if the gas danger early warning set is n-shaped danger-variable early warning set = F-2, generating a slow speed regulation and control signal, and generating a medium speed regulation and control signal under the other conditions;
and step U4, sending the rapid regulation and control signal, the slow regulation and control signal or the medium speed regulation and control signal to a processor.
The processor receives the rapid regulation and control signal and then sends a III-level air exhaust instruction to the air exhaust assembly, the processor receives the medium-speed regulation and control signal and then sends a II-level air exhaust instruction to the air exhaust assembly, the processor receives the slow regulation and control signal and then sends a I-level air exhaust instruction to the air exhaust assembly, and the air exhaust efficiency of the III-level air exhaust instruction is greater than that of the II-level air exhaust instruction and that of the I-level air exhaust instruction.
The second embodiment:
as shown in fig. 2 and fig. 7-8, the difference between this embodiment and embodiment 1 is that an opening and closing dustproof mechanism 9 is installed on the front side of the fume hood body 1, the opening and closing dustproof mechanism 9 includes a transparent sealing door 91, the transparent sealing door 91 is located right in front of the fume hood body 1, a horizontal mounting plate 92 is fixedly disposed at a position, close to the top, on the front side of the fume hood body 1, an opening and closing driving motor 93 is fixedly disposed on the horizontal mounting plate 92 through a motor base, vertical screws 94 are rotatably disposed on two sides of the bottom of the horizontal mounting plate 92 through bearings, the opening and closing driving motor 93 is used for driving one group of the vertical screws 94, the two groups of the vertical screws 94 synchronously rotate under the action of a driving belt 96, inner thread blocks 95 are fixedly disposed on two sides of the transparent sealing door 91, and the vertical screws 94 are in threaded connection with the corresponding inner thread blocks 95;
when the fume chamber of laboratory is in unoperated state or when the operation in-process need shelter from the positive opening of the fume chamber cabinet body 1, make the vertical screw rod 94 who links to each other rotatory through opening and close driving motor 93 among the dustproof mechanism 9 of opening and close, drive belt 96 makes two sets of vertical screw rods 94 carry out synchronous revolution, thereby transparent sealing door 91 carries out vertical downstream under the effect of two sets of internal thread pieces 95, until transparent sealing door 91 seals the positive opening of the fume chamber cabinet body 1, play dustproof and guard action, and because transparent sealing door 91 is transparent, avoid influencing the inside situation that operating personnel observed the fume chamber cabinet body 1.
Example three:
as shown in fig. 6, the difference between this embodiment and embodiments 1 and 2 is that the control panel 3 further includes a touch display module and an early warning reminding module, where the touch display module displays environmental condition information in the laboratory fume hood, and displays the gas danger early warning signal Yj1 or Yj2, the danger-variable early warning signal Bj1 or Bj2, the rapid regulation and control signal, the slow regulation and control signal, or the medium speed regulation and control signal, and is used for manually controlling the laboratory fume hood; the processor is in communication connection with the early warning reminding module, and when the processor sends a level III air exhaust instruction or a level II air exhaust instruction, the processor sends an early warning instruction to the early warning reminding module, and the early warning reminding module sends flickering light to play a reminding role; and the processor is in communication connection with the server, and the server is in communication connection with the background monitoring terminal, so that background monitoring personnel can know the internal environment information of the laboratory fume hood.
The working process and principle of the invention are as follows:
when the system is used, harmful gas in the laboratory fume hood is analyzed through the harmful gas early warning feedback module, the gas harm degree in the fume hood body 1 is obtained through the harmful gas analysis, a gas danger early warning signal Yj1 or Yj2 is generated based on the gas harm degree and is sent to the processor, and monitoring and analysis of the harmful gas in the fume hood body 1 are achieved; carrying out variable analysis on the inside of a laboratory fume hood through an auxiliary variable analysis module based on temperature information and smoke information, obtaining variable hazard degree in a fume hood body 1 through the variable analysis, generating a danger-variable early warning signal Bj1 or Bj2 based on the variable hazard degree and sending the danger-variable early warning signal Bj1 or Bj2 to a processor, and realizing monitoring analysis on variable factors in the fume hood body 1;
the multi-factor analysis regulation and control module carries out comprehensive measurement and judgment on the basis of the gas danger early warning signal Yj1 or Yj2 and the danger-changing early warning signal Bj1 or Bj2, generates a rapid regulation and control signal, a slow regulation and control signal or a medium speed regulation and control signal and sends the signals to the processor, and by combining and comprehensively analyzing the harmful gas condition and the temperature smoke condition in the fume hood, the comprehensive analysis result can accurately reflect the overall condition of the internal environment of the fume hood, the intelligent degree of equipment is improved, and the safety of the equipment in use is guaranteed;
after receiving the slow speed regulation and control signal, the processor sends an I-level exhaust instruction to the exhaust assembly, an exhaust driving motor 42 in the main exhaust mechanism 4 operates at the power of G1 and enables a main rotating shaft 43 to rotate, and main exhaust fan blades 44 enable air in the fume hood body 1 to upwards enter a main exhaust air box 41 and to be exhausted through a main exhaust pipe 6, so that slow speed exhaust is realized; after receiving the medium-speed regulation and control signal, the processor sends a second-stage air exhaust instruction to the air exhaust assembly, an air exhaust driving motor 42 in the main air exhaust mechanism 4 operates at the power of G2 and enables a main rotating shaft 43 to rotate, and the main air exhaust mechanism 4 exhausts air and simultaneously enables two groups of auxiliary air exhaust mechanisms 5 to exhaust air in an auxiliary manner through a self-adjusting transmission mechanism 8, so that multi-part medium-speed air exhaust is realized;
after receiving the rapid regulation and control signal, the processor sends a class-III exhaust instruction to the exhaust assembly, an exhaust driving motor 42 in the main exhaust mechanism 4 operates at G3 power and enables a main rotating shaft 43 to rotate, and the main exhaust mechanism 4 exhausts air and simultaneously enables two groups of auxiliary exhaust mechanisms 5 to perform auxiliary exhaust through a self-adjusting transmission mechanism 8, so that multi-part high-speed exhaust is realized; the air exhaust instructions of different grades are generated through comprehensive measurement and judgment results, the air exhaust instructions of different grades are used for controlling the air exhaust assembly to exhaust air in the interior of the ventilation cabinet body 1 according to different air exhaust modes, automatic and reasonable regulation and control of ventilation cabinet air exhaust operation are achieved, the intelligent degree of the laboratory ventilation cabinet is further improved, and the problem that the energy waste or the internal environment cannot be rapidly improved due to the fact that the ventilation cabinet body 1 is exhausted according to a single mode all the time at present is solved.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (9)
1. The intelligent alarm system for dust prevention and excessive harmful gas of the laboratory fume hood comprises a laboratory fume hood, wherein the laboratory fume hood comprises a fume hood body (1) and a hood body bearing plate (2), the fume hood body (1) is fixedly installed at the top of the hood body bearing plate (2) through bolts, and a hood body top plate (10) is fixedly arranged at the top of the fume hood body (1), and is characterized in that an opening and closing dustproof mechanism (9) and a control panel (3) are installed on the front side of the fume hood body (1), a gas detection sensor group, a smoke sensor and a temperature sensor are installed inside the fume hood body (1), and the gas detection sensor group, the smoke sensor and the temperature sensor are respectively in communication connection with the control panel (3); the control panel (3) comprises a processor, a data storage module, a hazardous gas early warning feedback module, an auxiliary variable analysis module and a multi-factor analysis regulation and control module, and the processor is in communication connection with the data storage module, the hazardous gas early warning feedback module, the auxiliary variable analysis module and the multi-factor analysis and control module;
an air exhaust assembly is arranged on the laboratory ventilation cabinet and consists of a main air exhaust mechanism (4) and an auxiliary air exhaust mechanism (5); the main exhaust mechanism (4) comprises an exhaust driving motor (42) fixedly arranged in a cabinet top plate (10) through a motor base and a main exhaust box (41) fixed to the top of the cabinet top plate (10) through bolts, a main exhaust pipe (6) is installed at the top of the main exhaust box (41), the ventilation cabinet body (1) is communicated with the main exhaust box (41) through a pipeline, a main rotating shaft (43) is rotatably arranged in the main exhaust box (41) through a bearing, the output end of the exhaust driving motor (42) is connected with one end of the main rotating shaft (43), and main exhaust fan blades (44) are fixedly arranged on the outer peripheral surface of the main rotating shaft (43);
the auxiliary exhaust mechanisms (5) are positioned at two sides of the fume hood body (1), each auxiliary exhaust mechanism (5) comprises an auxiliary exhaust box (51) fixedly arranged at the outer side of the fume hood body (1) through a bolt, one side of each auxiliary exhaust box (51) is communicated with the fume hood body (1) through a pipeline, and an auxiliary exhaust pipe (7) is arranged at the other side of each auxiliary exhaust box (51); an auxiliary rotating shaft (52) penetrating the top of the auxiliary air exhaust box (51) is rotatably installed on the auxiliary air exhaust box (51), auxiliary exhaust fan blades (53) are fixedly arranged on the part, located in the auxiliary air exhaust box (51), of the auxiliary rotating shaft (52), and the auxiliary rotating shaft (52) and the main rotating shaft (43) are driven through a self-adjusting transmission mechanism (8).
2. The intelligent alarm system for dust prevention and hazardous gas excess of the laboratory fume hood according to claim 1, wherein the processor generates a hazardous gas analysis signal and sends the hazardous gas analysis signal to the hazardous gas early warning feedback module, the hazardous gas early warning feedback module analyzes hazardous gas in the laboratory fume hood after receiving the hazardous gas analysis signal, generates a gas risk early warning signal Yj1 or Yj2 through analysis, and sends the gas risk early warning signal Yj1 or Yj2 to the processor;
the processor generates a variable analysis signal and sends the variable analysis signal to the auxiliary variable analysis module, the auxiliary variable analysis module performs variable analysis on the interior of the laboratory ventilation cabinet after receiving the variable analysis signal, generates a danger-variable early warning signal Bj1 or Bj2 through analysis, and sends the danger-variable early warning signal Bj1 or Bj2 to the processor;
after receiving the gas risk early warning signal Yj1 or Yj2 and the danger-changing early warning signal Bj1 or Bj2, the processor generates a multi-factor comprehensive judgment signal and sends the gas risk early warning signal Yj1 or Yj2, the danger-changing early warning signal Bj1 or danger-changing early warning signal Bj2 and the multi-factor comprehensive judgment signal to the multi-factor analysis and control module, the multi-factor analysis and control module receives the multi-factor comprehensive judgment signal and then carries out comprehensive measurement and judgment to generate a fast regulation and control signal, a slow regulation and control signal or an intermediate speed regulation and control signal, and sends the fast regulation and control signal, the slow regulation and control signal or the intermediate speed regulation and control signal to the processor;
the processor receives the rapid regulation and control signal and then sends a III-level air exhaust instruction to the air exhaust assembly, the processor receives the medium-speed regulation and control signal and then sends a II-level air exhaust instruction to the air exhaust assembly, the processor receives the slow regulation and control signal and then sends a I-level air exhaust instruction to the air exhaust assembly, and the air exhaust efficiency of the III-level air exhaust instruction is greater than that of the II-level air exhaust instruction and that of the I-level air exhaust instruction.
3. The laboratory fume hood dust-proof and hazardous gas excess intelligent alarm system according to claim 2, wherein the specific operation process of the hazardous gas early warning feedback module comprises:
calling a name of hazardous gas to be monitored in the operation of a laboratory fume hood through a data storage module, and marking the hazardous gas to be monitored as i, i = {1,2,3, \8230;, n }, wherein n is the number of the hazardous gas to be monitored and n is a positive integer greater than 1;
setting a detection time interval j, j = {1,2,3, \8230, m }, wherein m is a positive integer larger than 1, and the time intervals of two adjacent groups of detection time intervals are the same by taking the current starting running time of the laboratory fume hood as a starting time; collecting concentration data of the hazardous gas i to be monitored in a detection time period j, and marking the concentration data of the hazardous gas i to be monitored in the detection time period j as an actual concentration value Dij;
calling a preset concentration threshold value of the hazardous gas i to be monitored through a data storage module, marking the preset concentration threshold value of the hazardous gas i to be monitored as Ti, and enabling the preset concentration threshold value Ti to be in one-to-one correspondence with the hazardous gas i to be monitored and the real concentration value Dij;
respectively comparing the actual concentration value Dij of the hazardous gas i to be monitored with the corresponding preset concentration threshold value Ti, and if one actual concentration value Dij of the hazardous gas i to be monitored is greater than or equal to the corresponding preset concentration threshold value Ti, generating a gas risk early warning signal Yj1;
if the actual concentration value Dij of the hazardous gas i to be monitored is smaller than the corresponding preset concentration threshold value Ti, performing gas danger analysis based on the actual concentration value Dij of the hazardous gas i to be monitored and the corresponding preset concentration threshold value Ti, and generating a gas danger early warning signal Yj1 or Yj2 through the gas danger analysis;
and sending the gas risk early warning signal Yj1 or Yj2 to a processor.
4. The laboratory fume hood dustproof and hazardous gas excess intelligent alarm system according to claim 3, wherein the specific process of gas risk analysis is as follows:
calculating the difference value between a preset concentration threshold value Ti and the real concentration value Dij of the harmful gas i to be monitored to obtain a gas deviation value CZij corresponding to the detection time period;
distributing corresponding weight coefficients to the hazardous gas i to be monitored, and marking the weight coefficients of the hazardous gas i to be monitored as Ri; multiplying the gas deviation value CZij of the hazardous gas i to be monitored in the detection time period by the corresponding weight coefficient Ri, and marking the sum of the products in each group as a gas hazardous value QWj;
acquiring a gas danger threshold value through a data storage module, comparing the gas danger value QWj with the gas danger threshold value, and generating a gas danger early warning signal Yj2 if the gas danger value QWj is larger than the gas danger threshold value; and if the gas danger value QWj is smaller than or equal to the gas danger threshold value, generating a gas danger early warning signal Yj1.
5. The intelligent alarm system for dust prevention and excessive hazardous gas in a laboratory fume hood according to claim 2, wherein the specific operation process of the auxiliary variable analysis module comprises:
distributing weight coefficients er1 and er2 to the temperature coefficient WXj and the smoke coefficient YXj through analyzing and acquiring the temperature coefficient WXj and the smoke coefficient YXj of the detection time period j, and analyzing and calculating through a formula BWj = (WXj. Er1+ YXj. Er 2)/(er 1+ er 2) to obtain a danger-variable value BWj;
calling a danger-changing threshold value through a data storage module, comparing the danger-changing value BWj with the value of the danger-changing threshold value, generating a danger-changing early warning signal Bj1 if the danger-changing value BWj is greater than or equal to the danger-changing threshold value, and generating a danger-changing early warning signal Bj2 if the danger-changing value BWj is smaller than the danger-changing threshold value;
and sending the danger-changing early warning signal Bj1 or danger-changing early warning signal Bj2 to a processor.
6. The intelligent alarm system for dust prevention and excessive hazardous gas in laboratory fume hoods of claim 5, characterized in that the analysis and acquisition method of the temperature and shadow coefficients WXj is as follows:
acquiring a temperature value of a current detection time interval and a temperature value of an adjacent previous detection time interval in a laboratory fume hood, judging whether the laboratory fume hood is in a temperature rising state or a temperature falling state based on two groups of temperature values, acquiring a temperature rise rate when the laboratory fume hood is judged to be in the temperature rising state, and acquiring a temperature fall rate when the laboratory fume hood is judged to be in the temperature falling state; carrying out numerical analysis based on the temperature value in the current detection time period and combining the temperature rise rate or the temperature drop rate to obtain a temperature shadow coefficient WXj;
the method for analyzing and acquiring the smoke shadow coefficient YXj comprises the following steps:
acquiring a smoke concentration value of a current detection period and a smoke concentration value of an adjacent previous detection period in a laboratory fume hood, judging whether the laboratory fume hood is in a smoke concentration rising state or a smoke concentration falling state based on the two groups of smoke concentration values, acquiring a smoke rising rate when the laboratory fume hood is judged to be in the smoke concentration rising state, and acquiring a smoke falling rate when the laboratory fume hood is judged to be in the smoke concentration falling state; and carrying out numerical analysis based on the smoke concentration value of the current detection period and in combination with the smoke rising rate or the smoke falling rate to obtain a smoke shadow coefficient YXj.
7. The intelligent alarm system for dust prevention and hazardous gas excess of the laboratory fume hood according to claim 6, wherein the processor sends a gas risk early warning signal Yj1 or Yj2 and a danger-variable early warning signal Bj1 or danger-variable early warning signal Bj2 to the multi-factor analysis and regulation module, when the multi-factor analysis and regulation module receives the gas risk early warning signal Yj1 or Yj2, the gas risk early warning signal Yj1 is calibrated to be a symbol F-1, the gas risk early warning signal Yj2 is calibrated to be a symbol F-2, and a gas risk early warning set { F-1, F-2} is established;
when the multi-factor analysis regulation and control module receives the danger-variable early warning signal Bj1 or the danger-variable early warning signal Bj2, calibrating the danger-variable early warning signal Bj1 as a symbol F-1, calibrating the danger-variable early warning signal Bj2 as a symbol F-2, and establishing a danger-variable early warning set { F-1, F-2};
performing set intersection analysis on the gas danger early warning set and the variable danger early warning set, generating a rapid regulation and control signal if the gas danger early warning set is inverted U-shaped variable danger early warning set = F-1, generating a slow regulation and control signal if the gas danger early warning set is inverted U-shaped variable danger early warning set = F-2, and generating an intermediate speed regulation and control signal under the other conditions; and sending the fast regulation and control signal, the slow regulation and control signal or the medium speed regulation and control signal to a processor.
8. The laboratory fume hood dustproof and excessive harmful gas intelligent alarm system according to claim 1, wherein the opening and closing dustproof mechanism (9) comprises a transparent sealing door (91) for shielding a front opening of a fume hood body (1), a horizontal mounting plate (92) is fixedly arranged at a position, close to the top, of the front of the fume hood body (1), a driving motor (93) is fixedly arranged on the horizontal mounting plate (92) through a motor base, vertical screw rods (94) are rotatably arranged on two sides of the bottom of the horizontal mounting plate (92) through bearings, the two groups of vertical screw rods (94) are in transmission connection through a transmission belt (96), an output end of the driving motor (93) is connected with one group of vertical screw rods (94), inner thread blocks (95) are fixedly arranged on two sides of the transparent sealing door (91), and the vertical screw rods (94) are in threaded connection with the corresponding inner thread blocks (95).
9. The intelligent alarm system for dust prevention and excessive hazardous gas of the laboratory fume hood according to claim 1, wherein the self-adjusting transmission mechanism (8) comprises transverse transmission shafts (81) rotatably mounted on two sides of the main exhaust box (41) through bearings, mounting blocks (11) are fixedly arranged on two sides of the top plate (10) of the cabinet body, the top ends of the auxiliary rotating shafts (52) penetrate upwards through the corresponding mounting blocks (11) and are rotatably connected with the corresponding mounting blocks, first bevel gears (12) are mounted on one ends of the transverse transmission shafts (81) far away from the main exhaust box (41) and the top ends of the auxiliary rotating shafts (52), and two groups of the first bevel gears (12) are meshed and connected;
transverse transmission shaft (81) are located one end and the spacing installation section of thick bamboo (84) fixed connection of main exhaust box (41), spacing installation section of thick bamboo (84) internal fixation sets up connecting spring (86) and slides through the slide rail and sets up annular movable block (85), and the other end and the annular movable block (85) fixed connection of connecting spring (86), annular movable block (85) one side of connecting spring (86) is fixed dorsad sets up connecting axle (82) of outwards wearing out spacing installation section of thick bamboo (84), all install second bevel gear (83) on connecting axle (82) and main rotation axis (43), and two sets of second bevel gear (83) meshing are connected, and spacing installation section of thick bamboo (84) internal fixation sets up annular electromagnet (87).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211311476.8A CN115662072A (en) | 2022-10-25 | 2022-10-25 | Dustproof and excessive harmful gas intelligent alarm system for laboratory ventilation cabinet |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116381302A (en) * | 2023-04-14 | 2023-07-04 | 杭州中凯通信设备有限公司 | Embedded waterproof electric energy metering box |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116381302A (en) * | 2023-04-14 | 2023-07-04 | 杭州中凯通信设备有限公司 | Embedded waterproof electric energy metering box |
| CN116381302B (en) * | 2023-04-14 | 2023-11-07 | 杭州中凯通信设备有限公司 | Embedded waterproof electric energy metering box |
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Application publication date: 20230131 |