CN111069217A - Intelligence experiment fume chamber - Google Patents
Intelligence experiment fume chamber Download PDFInfo
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- CN111069217A CN111069217A CN201911168762.1A CN201911168762A CN111069217A CN 111069217 A CN111069217 A CN 111069217A CN 201911168762 A CN201911168762 A CN 201911168762A CN 111069217 A CN111069217 A CN 111069217A
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- window
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- hood
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
- B08B15/02—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area using chambers or hoods covering the area
- B08B15/023—Fume cabinets or cupboards, e.g. for laboratories
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
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Abstract
The invention relates to an intelligent experiment fume hood, which comprises a hood body, wherein a vent (18) is arranged at the top of the hood body, a window (12) capable of ascending and descending is arranged on the side surface of the hood body, a butterfly valve for controlling the opening degree of the vent (18) is arranged in the vent, a surface wind speed sensor (138) for measuring the wind speed of the inner surface of the hood body is arranged in the hood body, a stay wire displacement sensor (137) for monitoring the position of the window (12) is arranged at the window (12), and the window (12), the surface wind speed sensor (138), the stay wire displacement sensor (137) and a butterfly valve (133) are all connected to a processor (13); when the experimental ventilation cabinet works, the processor (13) controls the opening and the angle of the butterfly valve according to the wind speed on the inner surface of the cabinet body and the position of the window (12) so that the wind speed on the inner surface of the cabinet body is in a standard range. Compared with the prior art, the invention has the advantages of accurate control and effective guarantee of personnel safety and experimental authenticity.
Description
Technical Field
The invention relates to an experiment ventilation cabinet, in particular to an intelligent experiment ventilation cabinet.
Background
The purpose of experiment fume chamber is on the basis of maintaining the stable environmental condition of chemical reaction, provides safe, environmental protection's workspace. The intelligent experiment fume chamber helps experimenters to complete the speed and the efficiency of an experiment task, so that the experiment fume chamber tends to be intelligent and is a hot spot problem at home and abroad at present.
At present, the experimental fume hoods on the market all use a microprocessor and a control network as cores, and the intelligent degree is not high. With the continuous development of emerging technologies such as big data, cloud computing, mobile internet, internet of things and embedded systems, the intelligent degree of the existing fume hood cannot meet the requirements of users.
The existing ventilation cabinets on the market are mainly constant-air-volume ventilation cabinets, and the variable-air-volume and ductless air-purifying type ventilation cabinets are fewer. The air valve of the fixed blade needs to be manually adjusted for the constant air volume ventilation cabinet, so that the air exhaust volume of the ventilation cabinet is adjusted, and the expected surface air speed is achieved when the air valve is adjusted to a certain angle. The variable air volume fume hood system controls the air exhaust volume by controlling a sensor of a regulating valve, so that the surface air speed reaches a desired value. Ductless net gas type fume chamber system uses Neutrodine patent filtration technique, purifies the gas that the experiment produced under the condition that need not to exhaust, can effectively filter most common chemical gas.
At present, ductless air purification type fume hoods can only use limited chemicals, and the filtering capacity of the chemicals is also uneven. The air volume-fixing fume hood system is large in noise and energy consumption, so that the laboratory environment is poor, the overall design is backward, the requirements for increasingly-improved occupational safety cannot be met, and the problems that whether the fume hood is normally exhausted, whether the negative pressure of the fume hood is correct and the like cannot be known by experimenters are solved, and the air volume-fixing fume hood system is poor in system management and system expansion. The variable air volume fume chamber system in the current stage is high in investment in earlier stage, the intelligent degree is not high, and experimenters cannot know the state of the fume chamber in real time.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an intelligent experimental fume hood.
The purpose of the invention can be realized by the following technical scheme:
an intelligent experiment ventilation cabinet comprises a cabinet body, wherein a vent is arranged at the top of the cabinet body, and a window capable of lifting up and down is arranged on the side face of the cabinet body;
when the experimental ventilation cabinet works, the processor controls the opening and the angle of the butterfly valve according to the wind speed on the inner surface of the cabinet body and the position of the window, so that the wind speed on the inner surface of the cabinet body is in a standard range.
The external side of the cabinet body is provided with an HMI man-machine interaction display screen for man-machine interaction, and the HMI man-machine interaction display screen is connected to the processor.
The intelligent experiment ventilation cabinet is further provided with a gesture sensor for gesture operation, and the gesture sensor is respectively connected with the HMI human-computer interaction display screen and the processor.
The top of the window is provided with a head top infrared sensor used for sensing a human body, the head top infrared sensor is connected to the processor, and the processor is triggered to open the window after the head top infrared sensor senses the human body.
The utility model discloses a window, its structure includes window, treater, infrared correlation sensor, the window bottom both sides be equipped with infrared correlation sensor, infrared correlation sensor connect the treater, move down the in-process at the window, when infrared correlation sensor detected there is the object, the treater control window stops to move down.
The bottom of the cabinet body is provided with a foot-operated key for manually controlling the lifting of the window, and the foot-operated key is connected to the processor.
The bottom of the cabinet body is provided with a storage cabinet for storing articles.
The cabinet body on still be equipped with buzzer and the LED lamp that is used for unusual warning, buzzer and LED lamp all be connected to the treater.
Compared with the prior art, the invention has the following advantages:
(1) according to the invention, the wind speed on the inner surface of the cabinet body and the position of the window are measured in real time through the surface wind speed sensor and the stay wire sensor, so that the opening and the angle of the butterfly valve are accurately controlled, the wind speed in the cabinet is more quickly and accurately kept in the national specified surface wind speed standard range, the safety of personnel and the authenticity of experiments are ensured, and each intelligent experiment ventilation cabinet is independently controlled and does not interfere with each other, so that the management and the expansion of a VAV system are facilitated;
(2) according to the invention, an HMI (human machine interface) man-machine interaction display screen is used, and through interface design and control setting, data acquisition of various sensors and data processing of a processor, various parameters in the cabinet can be displayed in real time, and various cabinet actions can be completed, so that the use of operators is facilitated;
(3) according to the invention, different gestures are defined by using the gesture sensor, so that the gestures can be stably and rapidly recognized under different bright and dark conditions, the operation in the cabinet such as opening and closing of the window is further controlled, the operation of experimenters is facilitated, and the service life of the experimental cabinet is prolonged.
Drawings
FIG. 1 is a schematic view of the overall structure of an intelligent experimental fume hood of the present invention;
FIG. 2 is a top view of the intelligent experimental fume hood of the present invention;
FIG. 3 is a control block diagram of the intelligent experimental fume hood of the present invention;
FIG. 4 is a block flow diagram of wind speed control according to the present invention;
FIG. 5 is a block diagram of the process of acquiring wind speed according to the present invention;
FIG. 6 is a block diagram of the flow of the butterfly valve control of the present invention;
FIG. 7 is a block diagram of a window control process according to the present invention;
FIG. 8 is a block diagram illustrating a process for obtaining window height according to the present invention;
FIG. 9 is a block diagram of a process for performing window lifting according to the present invention.
In the figure, 11 is an electric box, 111 is an analog-digital conversion module, 12 is a window, 13 is a processor, 131 is an infrared correlation sensor, 132 is an overhead infrared sensor, 133 is a butterfly valve, 134 is a window door motor, 135 is a buzzer, 136 is an LED lamp, 137 is a displacement sensor, 138 is a face wind speed sensor, 139 is a gesture sensor, 14 is an operation console, 15 is an HMI man-machine interaction display screen, 16 is a storage cabinet, 17 is a foot key, 18 is a vent, and 19 is a counterweight block.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. Note that the following description of the embodiments is merely a substantial example, and the present invention is not intended to be limited to the application or the use thereof, and is not limited to the following embodiments.
Examples
As shown in figure 1, the intelligent fume hood of the invention comprises an electric box 11 for receiving external power, a window 12 capable of moving up and down, an infrared correlation sensor 131 at the bottom of the window 12, an overhead infrared sensor 132 positioned above the fume hood, a ventilation opening 18 connected with a VAV system, an operation table 14 for carrying out chemical experiments, an HMI man-machine interaction display screen 15 positioned at the right of the window, a storage cabinet 16 positioned at the lower part of the fume hood for storing articles and a foot-operated key 17 at the bottom of the fume hood, wherein the foot-operated key 17 is used for manually controlling the window to ascend and descend. The overhead infrared sensor 132 is used to sense a human body and triggers the processor 13 to open the window 12 when the overhead infrared sensor 132 senses a human body. The infrared correlation sensor 131 is connected to the processor 13, and when the infrared correlation sensor 131 detects an object in the downward movement process of the window 12, the processor 13 controls the window 12 to stop moving downward.
As shown in FIG. 2, the window door motor 134 rotates the caterpillar band to drive the counterweight block 19 to control the window 12 up and down, and the position of the window can be measured by the stay wire displacement sensor 137, so as to assist in controlling the wind speed in the cabinet.
As shown in fig. 3, the processor 13 controls the infrared correlation sensor 131, the overhead infrared sensor 132, the butterfly valve 133, the door motor 134, the foot-operated key 17, the buzzer 135 and the LED lamp 136 through digital signals, the processor 13 controls the displacement sensor 137 and the face wind speed sensor 138 through analog signals, the processor 13 controls the gesture sensor 139 through serial signals, and the processor 13 is connected to the HMI human-machine interaction display screen 15 through an rs232 interface. The buzzer 135 and the LED lamp 136 are used for alarming abnormality, including but not limited to that the wind speed in the cabinet is not in a safe range, that the window 12 is abnormal in the lifting process, and the like.
The processor 13 collects environmental information such as the surface wind speed, the window height, the temperature and the like of the cabinet through the analog-to-digital conversion module 111 in the electric box 11, and transmits the environmental information to the HMI human-machine interaction interface through the rs232 interface for displaying, so that an operator can know various conditions in the cabinet in real time.
The gesture sensor 139 recognizes various gestures of the person, upward, downward, leftward, forward pressure, etc., and communicates with the processor 13 through a serial port. The processor 13 transmits the control command through the analog-to-digital conversion module 111, and can control the window door motor 134, the buzzer 135, the LED136, the butterfly valve 133, and the like.
In order to ensure that the air speed of the inner surface of the cabinet is kept within the national standard (0.4-0.6 m/s) for the air speed of the ventilation cabinet surface, the invention uses the following method:
exhaust air volume (unit: m)3The calculation formula is as follows:
L＝3600×SVβ (1)
in the formula: s is the opening area (unit: m) of the operation opening2) V is surface wind speed (unit: m/s), β is a safety factor (1.05-1.1), and for a ventilation cabinet without an adjusting system, if the surface wind speed of 0.3-0.5 m/s is met when an operating door is fully opened, the surface wind speed exceeds a designed value when the operating door is opened half or fully closed, and the exhaust and experiment effects are greatly influenced.
The actual ventilation of the fumehood can be represented by the following equation:
Q＝SV＝SWH (2)
in the formula: s is the opening area (unit: m) of the operation opening2) (ii) a V is the surface wind speed (unit: m/s); w is the opening width (unit: m) of the fume hood; h is the height (unit: m) of the window of the fume hood.
The stroke signal of the window is transmitted to the processor 13 by adopting a sensor on the cabinet door, and the processor 13 calculates the set air volume signal according to the set surface air speed and the formula (2), so that the valve opening required by the set air speed can be obtained under the current window height. And then converted into an electric signal corresponding to the opening of the butterfly valve 133 according to the real-time air volume measured by the surface air velocity sensor 138. An output voltage is obtained by control in the control chip, and the opening of the butterfly valve 133 is controlled, so that the wind speed control is realized. The specific wind speed control process is shown in fig. 4, the real-time wind speed is obtained, if the wind speed is equal to the target wind speed, the butterfly valve does not act, and if the wind speed is not equal to the real-time wind speed, the butterfly valve is adjusted according to the deviation ratio of the real-time wind speed and the target wind speed.
As shown in fig. 5, which is a flow chart for acquiring a real-time wind speed, in order to solve the problems that the data acquisition accuracy is seriously affected due to the gas viscosity or the disturbance such as turbulence and vortex generated when the gas is extracted, the data after the AD conversion is filtered. During wind speed measurement, discrete time data are obtained, so a discrete dynamic time system simulation is needed, the filter algorithm dynamically generates statistical prediction parameters by using the obtained observed values, and the specific filter algorithm is as follows:
in the formula: x (n) is a state vector of the system at discrete time, which is a measured value of the wind speed on the inner surface of the cabinet; a is a state transition matrix, and an initial value is set as E, because the algorithm has the characteristic of carrying out dynamic weighting correction on the measured value at the next moment and the estimated value at the previous moment according to the measured value at the next moment, the setting does not influence the state transition characteristic of the surface wind speed, and the noise during the wind speed measurement can be removed; re2 is the system noise matrix; c is a forecasting factor matrix; d is an observation noise matrix; v (n) is the predicted value of the wind speed, the optimal estimated value at the moment and the result after filtering.
The filtering algorithm is used for filtering the measured wind speed on the inner surface of the cabinet, the noise generated by the system and the environment can be filtered, and the processed value V (n) is provided for a wind speed control system.
Fig. 6 shows a flow chart of the butterfly valve control, in which the delay waiting time is set to solve the viscosity problem of the fluid control.
Fig. 7 is a general flow chart of window control, specifically, the height of the window is obtained, if the height of the window is smaller than the target height, the deviation ratio is calculated, the window is controlled to rise, and if the height of the window is larger than the target height, the deviation ratio is calculated, and the window is controlled to fall.
Fig. 8 is a flowchart illustrating the process of obtaining the height of the window, in which the measurement data is AD-converted, the window height percentage is set to 100% if the AD-conversion value is greater than 0 and the conversion value is greater than the set maximum value, the window height percentage is set to 0% if the AD-conversion value is greater than 0 and the conversion value is less than the set minimum value, and the window height percentage is converted if the AD-conversion value is greater than 0 and the conversion value is between the set maximum value and the set minimum value.
As shown in fig. 9, which is a flow chart of executing window lifting, in the control process, the deviation ratio between the actual window height and the target window height is read, in this process, if infrared correlation is triggered, the window is stopped from moving, if the deviation ratio is regular, the window is started to rise, and if the deviation is negative, the window is started to fall.
The method solves the problem of accurate control of the air fluid by calculating the addition of the regulation delay in the wind speed control stage; the wind speed sensor on the inner surface of each intelligent ventilation cabinet measures the wind speed in the cabinet in real time, the position of the window is monitored through the stay wire displacement sensor, and the rotation angle of the baffle of the butterfly valve and the opening and closing degree of the window are controlled through filtering and calculation, so that the wind speed on the inner surface of the cabinet can be accurately controlled to reach the national standard range; different gestures are controlled through the gesture sensor, so that the problem that an experimenter wears gloves to cause inconvenience in touch control and is polluted by chemical reagents is solved; through HMI human-computer interaction interface, can be with the data display who gathers in real time on the screen, let the experimenter know the real-time circumstances in the cabinet, be of value to guarantee experimenter's safety.
The problem of viscosity of the fluid is solved by increasing regulation delay; the surface wind speed sensor and the stay wire displacement sensor are used for AD conversion and filtering processing of measured data, and the wind speed in the cabinet is more quickly and accurately kept within the national surface wind speed standard range through a control algorithm of an air valve and a window, so that the safety of personnel and the authenticity of an experiment are ensured; the cabinets are mutually independent through the control of the independent air valve window of each cabinet, so that the management and the expansion are easy; through the addition of HMI interface and gesture sensor for the use of experimenter is convenient more, safety, and has promoted the life of intelligent experiment fume chamber.
The above embodiments are merely examples and do not limit the scope of the present invention. These embodiments may be implemented in other various manners, and various omissions, substitutions, and changes may be made without departing from the technical spirit of the present invention.
Claims (8)
1. An intelligent experiment fume hood comprises a hood body, wherein a vent (18) is arranged at the top of the hood body, a window (12) capable of ascending and descending is arranged on the side face of the hood body, and the intelligent experiment fume hood is characterized in that a butterfly valve for controlling the opening degree of the vent (18) is arranged on the vent, a face wind speed sensor (138) for measuring the wind speed of the inner face of the hood body is arranged in the hood body, a stay wire displacement sensor (137) for monitoring the position of the window (12) is arranged at the window (12), and the window (12), the face wind speed sensor (138), the stay wire displacement sensor (137) and a butterfly valve (133) are all connected to a processor (;
when the experimental ventilation cabinet works, the processor (13) controls the opening and the angle of the butterfly valve according to the wind speed on the inner surface of the cabinet body and the position of the window (12) so that the wind speed on the inner surface of the cabinet body is in a standard range.
2. An intelligent experiment ventilation hood according to claim 1, wherein an HMI (human machine interface) display screen (15) for human-computer interaction is arranged on the outer side of the hood body, and the HMI display screen (15) is connected to the processor (13).
3. An intelligent laboratory ventilation hood according to claim 2, characterized in that the intelligent laboratory ventilation hood is further provided with a gesture sensor (139) for gesture operation, and the gesture sensor (139) is respectively connected with the HMI man-machine interaction display screen (15) and the processor (13).
4. An intelligent laboratory ventilation hood according to claim 1, characterized in that the top of the window (12) is provided with an overhead infrared sensor (132) for sensing a human body, the overhead infrared sensor (132) is connected to the processor (13), and when the overhead infrared sensor (132) senses a human body, the processor (13) is triggered to open the window (12).
5. An intelligent experiment ventilation cabinet according to claim 1, wherein the infrared correlation sensors (131) are arranged on two sides of the bottom of the window (12), the infrared correlation sensors (131) are connected with the processor (13), and when the window (12) moves downwards, the processor (13) controls the window (12) to stop moving downwards when the infrared correlation sensors (131) detect an object.
6. An intelligent experiment ventilation cabinet according to claim 1, wherein a foot-operated key (17) for manually controlling the lifting of the window (12) is arranged at the bottom of the cabinet body, and the foot-operated key (17) is connected to the processor (13).
7. An intelligent experimental ventilation hood according to claim 1, characterized in that a storage cabinet (16) for storing articles is arranged at the bottom of the hood body.
8. An intelligent experiment ventilation cabinet according to claim 1, wherein a buzzer (135) and an LED lamp (136) for alarming for abnormality are further arranged on the cabinet body, and the buzzer (135) and the LED lamp (136) are both connected to the processor (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911168762.1A CN111069217A (en) | 2019-11-25 | 2019-11-25 | Intelligence experiment fume chamber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911168762.1A CN111069217A (en) | 2019-11-25 | 2019-11-25 | Intelligence experiment fume chamber |
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| CN111069217A true CN111069217A (en) | 2020-04-28 |
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| CN201911168762.1A Pending CN111069217A (en) | 2019-11-25 | 2019-11-25 | Intelligence experiment fume chamber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113102432A (en) * | 2021-04-13 | 2021-07-13 | 博兰特智慧实验室(江苏)有限公司 | Intelligent fume hood system and control method thereof |
| CN115971194A (en) * | 2022-12-29 | 2023-04-18 | 广州驰拓智能科技有限公司 | Variable air volume control method and device for fume hood |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204747039U (en) * | 2015-05-27 | 2015-11-11 | 广州澳企实验室设计有限公司 | Intelligence fume chamber |
| CN204799657U (en) * | 2015-05-22 | 2015-11-25 | 阮红正 | Wind type variable blast volume fume chamber is mended in numerical control |
| CN205732222U (en) * | 2016-05-11 | 2016-11-30 | 广州昕展实验室设备科技有限公司 | Ventilated chamber self adaptation variable air volume control system |
| CN106269768A (en) * | 2015-05-25 | 2017-01-04 | 上海琨聚电子科技有限公司 | A kind of laboratory variable air ventilated chamber |
| US20170061630A1 (en) * | 2012-09-20 | 2017-03-02 | Siemens Industry, Inc. | System for detecting a position of a fume hood sash |
| CN209363241U (en) * | 2018-12-20 | 2019-09-10 | 安徽旭科实验设备科技有限公司 | Vent cabinet |
| CN110347090A (en) * | 2019-07-31 | 2019-10-18 | 杭州北马科技有限公司 | A kind of gestural control method of vent cabinet |
-
2019
- 2019-11-25 CN CN201911168762.1A patent/CN111069217A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170061630A1 (en) * | 2012-09-20 | 2017-03-02 | Siemens Industry, Inc. | System for detecting a position of a fume hood sash |
| CN204799657U (en) * | 2015-05-22 | 2015-11-25 | 阮红正 | Wind type variable blast volume fume chamber is mended in numerical control |
| CN106269768A (en) * | 2015-05-25 | 2017-01-04 | 上海琨聚电子科技有限公司 | A kind of laboratory variable air ventilated chamber |
| CN204747039U (en) * | 2015-05-27 | 2015-11-11 | 广州澳企实验室设计有限公司 | Intelligence fume chamber |
| CN205732222U (en) * | 2016-05-11 | 2016-11-30 | 广州昕展实验室设备科技有限公司 | Ventilated chamber self adaptation variable air volume control system |
| CN209363241U (en) * | 2018-12-20 | 2019-09-10 | 安徽旭科实验设备科技有限公司 | Vent cabinet |
| CN110347090A (en) * | 2019-07-31 | 2019-10-18 | 杭州北马科技有限公司 | A kind of gestural control method of vent cabinet |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113102432A (en) * | 2021-04-13 | 2021-07-13 | 博兰特智慧实验室(江苏)有限公司 | Intelligent fume hood system and control method thereof |
| CN113102432B (en) * | 2021-04-13 | 2021-12-14 | 博兰特智慧实验室(江苏)有限公司 | Intelligent fume hood system and control method thereof |
| CN115971194A (en) * | 2022-12-29 | 2023-04-18 | 广州驰拓智能科技有限公司 | Variable air volume control method and device for fume hood |
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Application publication date: 20200428 |