CN115971194A - Variable air volume control method and device for fume hood - Google Patents
Variable air volume control method and device for fume hood Download PDFInfo
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Abstract
The utility model provides a method and a device for controlling variable air volume of a fume hood, relating to the technical field of fume hoods, wherein the method comprises the following steps: acquiring the surface wind speed of a fume hood; in response to the fact that the face wind speed does not meet the preset requirement, calculating an air exhaust quantity value required by the current fume hood based on the opening of the fume hood window displacement sensor and the set face wind speed value; and controlling the air quantity of the variable air quantity butterfly valve based on the air exhaust quantity value. From this, can control variable air volume butterfly valve's amount of wind and satisfy fume chamber volume of airing exhaust demand, keep face wind speed stable, guarantee experimental safety and personnel's safety.
Description
Technical Field
The disclosure relates to the technical field of fume hoods, in particular to a fume hood variable air volume control method and device.
Background
In the occasions such as laboratories and the like, the stability of parameters such as temperature, air pressure, air speed and the like of a room or a test operation platform needs to be ensured, and test waste gas and waste heat can be timely discharged, so that a ventilation system is needed. Generally, a ventilation system comprises a fan and a ventilation duct, wherein the ventilation duct is provided with a plurality of air suction openings, and the air suction openings are arranged above an operation platform. For some critical tests, the operating platform was located in a fume hood. The ventilation cabinet is one of the necessary devices of the ventilation system, the ventilation cabinet is a relatively closed cabinet body with a certain cavity space, a movable cabinet door is arranged in front of the cabinet body, and an operation platform is arranged in the cabinet body, so that experimenters can use the platform to engage in various physical and chemical tests after opening the cabinet door.
Therefore, how to realize the real-time adjustment of the air volume of the fume hood so as to ensure the test safety and personnel safety of a laboratory is a problem which needs to be solved urgently at present.
Disclosure of Invention
The present disclosure is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the purpose of the disclosure is to provide a variable air volume control method and device for a fume hood.
The method for controlling the variable air volume of the fume hood provided by the embodiment of the first aspect of the disclosure comprises the following steps:
acquiring the surface wind speed of the fume hood;
in response to the fact that the surface wind speed does not meet the preset requirement, calculating an exhaust air quantity value required by the current fume hood based on the opening of the fume hood window displacement sensor and the set surface wind speed value;
and controlling the air quantity of the variable air quantity butterfly valve based on the air exhaust quantity value.
The fume chamber variable air volume controlling means that this first aspect embodiment provided of this disclosure includes:
the acquisition module is used for acquiring the surface wind speed of the fume hood;
the calculation module is used for responding to the situation that the surface wind speed does not meet the preset requirement, and calculating the exhaust air quantity value required by the current fume hood based on the opening of the fume hood window displacement sensor and the set surface wind speed value;
and the control module is used for controlling the air quantity of the variable air quantity butterfly valve based on the air exhaust quantity value.
An embodiment of a third aspect of the present disclosure provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for controlling variable air volume of a fume hood as set forth in the embodiment of the first aspect of the present disclosure.
A fourth aspect of the present disclosure provides a computer program product, where instructions of the computer program product, when executed by a processor, perform a method for controlling a variable air volume of a fume hood as set forth in the first aspect of the present disclosure.
In the embodiment of the disclosure, the device firstly obtains the surface wind speed of the fume hood, then responds to the situation that the surface wind speed does not meet the preset requirement, calculates the exhaust air quantity value required by the current fume hood based on the opening of the fume hood window displacement sensor and the set surface wind speed value, and then controls the air quantity of the variable air quantity butterfly valve based on the exhaust air quantity value. From this, can control the amount of wind of variable air volume butterfly valve and satisfy fume chamber volume of airing exhaust demand, keep a face wind speed stable, guarantee experimental safety and personnel's safety.
Additional aspects and advantages of the disclosure will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the disclosure.
Drawings
The foregoing and/or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic flow chart of a variable air volume control method of a fume hood according to an embodiment of the present disclosure;
fig. 2 is a block diagram of a variable air volume control device of a fume hood according to a second embodiment of the disclosure;
fig. 3 is an application scene diagram of a variable air volume control method of a fume hood according to an embodiment of the present disclosure;
fig. 4 is a diagram of another application scenario of the variable air volume control method for the fume hood according to an embodiment of the present disclosure;
FIG. 5 illustrates a block diagram of an exemplary computer device suitable for use to implement embodiments of the present disclosure.
Detailed Description
Reference will now be made in detail to the embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of illustrating the present disclosure and should not be construed as limiting the same. On the contrary, the embodiments of the disclosure include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
Fig. 1 is a schematic flow chart of a variable air volume control method of a fume hood according to an embodiment of the present disclosure.
As shown in fig. 1, the variable air volume control method of the fume hood comprises the following steps:
It should be noted that, toxic and harmful gases generated in a laboratory must be removed in time, and the standard for measuring a laboratory fume hood is to be met, so that the harmful gases cannot overflow and turbulence cannot be generated in the fume hood, and therefore, the surface wind speed of the fume hood needs to be detected in real time.
Specifically, the surface wind speed of the fume hood can be measured through the surface wind speed sensor.
Optionally, the device may perform an alarm prompt based on a touch screen man-machine exchange interface in response to a determination that the surface wind speed is less than a preset value, and display operation parameters of an exhaust fan of the fume hood through the touch screen man-machine exchange interface, where the operation parameters include the surface wind speed, an operation state of the exhaust fan, and a static pressure value in an air duct. Wherein the preset value can be 0.15m/s. Therefore, the working personnel can know the alarm information in time, and accidents in work are avoided.
It should be noted that, the touch screen man-machine exchange interface is located on the control screen of the fume hood, and the corresponding power supply conditions are as follows: DC 5V, ± 10%, with the following characteristics: high resolution IPS liquid crystal, resolution: 480x854 capable of displaying information of surface wind speed, wind volume change, window opening, exhaust air temperature and the like, having functions of surface wind speed alarm, window opening overlarge prompt and exhaust air temperature overhigh prompt, having functions of embedded timer, controlling starting and stopping of equipment, lighting light, automatic door switch and automatic door prohibition, and having functions of setting emergency exhaust air mode and energy-saving mode.
And 102, in response to the fact that the surface wind speed does not meet the preset requirement, calculating an exhaust air quantity value required by the current fume hood based on the opening of the fume hood window displacement sensor and the set surface wind speed value.
As an indication, the preset requirement of the surface wind speed of the ventilation cabinet can be determined to be 0.4-0.6 m/s, and if the surface wind speed does not meet the preset requirement, the amount of air exhaust required by the current ventilation cabinet needs to be calculated.
Alternatively, the actual ventilation volume of the fume hood may be expressed by the following formula: q = SV = SWH.
Wherein, S can be the opening area of the operation opening, V is the surface wind speed, and Q is the actual ventilation volume of the current fume hood.
It should be noted that the opening area S of the operation opening may be calculated from the opening degree of the window, and there is a specific relationship between the opening degree of the window and the opening area S of the operation opening, which is not limited herein.
Alternatively, the window opening may be determined based on a fume hood window displacement sensor.
The opening area S of the operation opening is equal to the opening width W of the hood multiplied by the window opening of the hood, i.e., the window height H. The opening width W of the fume hood is constant, and the window opening of the fume hood can be changed along with the movement of the window.
It can be understood that if the surface wind speed does not meet the preset requirement, the exhaust air volume will not meet the requirement generally, optionally, the ventilation volume of the laboratory fume hood has a certain index, and the ventilation volume of a single fume hood is 800-1000m3/T generally.
Specifically, after the actual air discharge amount of the current fume hood is determined, the actual air discharge amount of the fume hood may be compared with the set air discharge amount of the current fume hood, so as to determine the air discharge amount required by the current fume hood.
The air exhaust volume value required by the current fume hood can be the air exhaust volume adjusting volume of the fume hood.
It should be noted that the fume hood controller is a microcomputer controller on the fume hood, and the microcomputer is used for executing complex logic calculation and control to manage the operation conditions of various electromechanical devices on the fume hood. And various physical resources of the fume hood are taken out by using the sensor for an operator to use, and the running reliability of various equipment can be greatly improved and the responsibility of system equipment can be simplified by using a microcomputer.
It should be noted that the controller is also corresponding to a touch screen human-computer exchange interface, where the touch screen human-computer exchange interface is a control screen of the ventilator controller.
It should be noted that holes (three phi 4 round holes and one phi 26 round hole) may be formed in appropriate positions on the right side of the ventilation cabinet according to a size diagram, then the control panel hanging plate is fixed by screws, and finally the control panel is hung on the hanging plate clamp by means of phi 26 round hole wiring.
Optionally, the controller (fume chamber controller) can control the position of the automatic door based on the automatic door controller, and perform closed-loop control on the face wind speed, and can also support modbusRTU networking operation.
Optionally, the controller at least comprises any one of the following features:
AC 220V power supply;
the built-in air quantity sensor can accurately measure the air flow passing through the air valve;
1 resistance type simulation input port for accurately measuring the window opening of the ventilation hood;
1 analog input port of 0-10V, is used for the monitoring of the sensor of the area wind speed;
1 0-10V analog output port for controlling the quick air valve actuator;
an automatic door controller is arranged in the automatic door control device, so that the position of the automatic door can be accurately controlled;
a sensor, an anti-clamping infrared sensor and a foot switch are arranged in the support area;
4 relay output ports for control of air exhauster, output of too low air exhaust amount and illumination control;
an independent control panel communication port, which adopts a butt terminal interface;
the surface wind speed is controlled in a closed loop mode, the response time is less than 1 second, and the stabilization time is less than 3 seconds;
and the Modbus RTU networking operation is supported.
As a possible implementation scheme, the device may determine the set surface wind speed value corresponding to the operation mode of the fume hood based on a preset mapping relationship.
It should be noted that the operation modes of the fume hood may be many, such as an energy saving mode, a normal operation mode, an emergency ventilation mode, a dangerous standby mode, an early warning mode, a regional ventilation mode, a safe ventilation mode, and the like, which is not limited herein.
It should be noted that the set surface wind speed values corresponding to different operation modes may be the same or different. For example, the set surface wind speed value corresponding to the normal operating mode may be 0.5m/s, the set surface wind speed value corresponding to the energy saving operating mode may be 0.3m/s, and the like, which is not limited herein.
Therefore, the required air exhaust amount value of the current fume hood is different under different working modes, and the preset requirements are different. That is, the preset requirements corresponding to different working modes are different.
Optionally, the device may further control the window to reach a set safety height in response to detection of a worker by the area-based presence sensor, detect a departure time of the worker, and then control the operation mode of the fume hood to enter the energy saving mode in response to determination that a time difference between the departure time of the worker and a current time is greater than the set time.
The departure time may be an initial time when the area presence sensor does not detect the staff member.
For example, if the area presence sensor detects a worker at the time T1 and does not monitor the worker at the time T2, the time T2 may be used as the departure time, and the time difference between the departure time and the current time is determined, and if the time difference is greater than the set time, the window sliding door may be controlled to automatically fall to the set minimum working opening.
It should be noted that, regional existence sensor can be located the fume chamber directly in the front upper place, and the auto-induction switches, and digital output, when detecting the staff, the control window rises to the safe height of settlement automatically, leaves when exceeding the settlement time at the staff, moves the door and can descend to the minimum work aperture of settlement automatically, gets into energy-conserving mode to utilize different colours to show operating condition, the degree of distinguishing is strong. (for example, blue is used as the normal mode, green is used as the energy-saving mode, and red is used as the emergency exhaust)
Optionally, the device may further detect an air flow passing through the air valve based on an air volume sensor in the controller, detect a window opening height of the fume hood, and update the current working mode of the fume hood in response to detecting that the window opening height of the fume hood is greater than a set working height, or that the air flow is greater than a preset threshold value.
And 103, controlling the air quantity of the variable air quantity butterfly valve based on the air exhaust quantity value.
Wherein, the variable air volume butterfly valve also comprises a quick actuator.
Optionally, the variable air volume butterfly valve is installed at the top of the ventilation cabinet and connected with the air pipe.
The device can control the air quantity of the variable air quantity butterfly valve based on the air discharge quantity value, so that the air quantity of the variable air quantity butterfly valve is controlled to meet the air discharge quantity requirement of the fume hood, and the surface air speed is kept stable.
Specifically, the variable air volume butterfly valve can be installed at the top of the ventilation cabinet according to the wind direction identification on the valve body, and is connected with the air pipe, and the joint is sealed.
Optionally, the device can also detect the automatic descending process of the window through an anti-pinch infrared sensor, and then control the window to stop descending under the condition that a barrier is detected.
Optionally, the device can also be based on the image detection device installed on the fume hood, detect the current use process of the fume hood, acquire abnormal images, and then send the abnormal images to the terminal equipment of the laboratory staff based on the wifi communication module.
Alternatively, an application scenario of the present disclosure may have a laboratory-differential pressure control system, as shown in fig. 3.
Specifically, on the premise of meeting the minimum ventilation frequency, the air supply quantity valve and the air exhaust quantity valve can be adjusted by detecting the room pressure difference so as to control the room pressure to be constant, and the ventilation cabinet is adjusted by the self variable air quantity control system. Hardware configuration: a pressure difference stabilizing automatic control system, a pressure-independent variable air volume regulating valve, an indoor pressure difference sensor and the like.
Optionally, the application scenario of the present disclosure may also have a negative pressure isolation ward-differential pressure control system, as shown in fig. 4.
Specifically, the air supply quantity can be fixed on the premise of meeting the minimum ventilation frequency, and the air exhaust valve is adjusted by detecting the room pressure difference so as to control the room pressure to be constant. Hardware configuration: a pressure difference stabilizing automatic control system, a pressure independent constant air volume valve, an air volume variable regulating valve, an indoor pressure difference sensor and the like.
In the embodiment of the disclosure, the device firstly acquires the surface wind speed of the fume hood, then responds to the situation that the surface wind speed does not meet the preset requirement, calculates the air exhaust quantity value required by the current fume hood based on the opening of the fume hood window displacement sensor and the set surface wind speed value, and then controls the air quantity of the variable air volume butterfly valve based on the air exhaust quantity value. From this, can control variable air volume butterfly valve's amount of wind and satisfy fume chamber volume of airing exhaust demand, keep face wind speed stable, guarantee experimental safety and personnel's safety.
Fig. 2 is a block diagram of a variable air volume control device of a fume hood according to a second embodiment of the present disclosure.
As shown in fig. 2, the variable air volume control device of the fume hood comprises:
the acquisition module is used for acquiring the surface wind speed of the fume hood;
the calculation module is used for responding to the situation that the surface wind speed does not meet the preset requirement, and calculating the exhaust air quantity value required by the current fume hood based on the opening of the fume hood window displacement sensor and the set surface wind speed value;
and the control module is used for controlling the air quantity of the variable air quantity butterfly valve based on the air exhaust quantity value.
Optionally, the calculation module further includes:
and the determining unit is used for determining a set surface wind speed value corresponding to the working mode of the fume hood based on a preset mapping relation.
Optionally, the determining unit is further configured to:
in response to the detection of a worker based on the area presence sensor, controlling the window to reach a set safety height and detecting the departure time of the worker;
and controlling the working mode of the fume hood to enter an energy-saving mode in response to determining that the time difference between the leaving time of the staff and the current time is greater than the set time.
Optionally, the obtaining module is further configured to: and when the surface wind speed is determined to be smaller than the preset value, carrying out alarm prompt based on a touch screen man-machine exchange interface, and displaying the operation parameters of the exhaust fan of the fume hood through the touch screen man-machine exchange interface, wherein the operation parameters comprise the surface wind speed, the operation state of the exhaust fan and the static pressure value in the air pipe.
Optionally, the variable air volume butterfly valve is installed at the top of the ventilation cabinet and connected with the air pipe.
Optionally, the determining unit is further configured to:
detecting the air flow passing through an air valve based on an air volume sensor in a controller, and detecting the window opening height of the fume hood;
and updating the current working mode of the fume hood in response to the condition that the window opening height of the fume hood is larger than a set working height or the air flow is larger than a preset threshold value.
Optionally, the controller is configured to:
controlling the position of the automatic door based on the automatic door controller;
carrying out closed-loop control on the face wind speed;
and supporting ModbusRTU networking operation.
Optionally, the apparatus further comprises:
the detection module is used for detecting the automatic descending process of the viewing window through the anti-pinch infrared sensor;
and the control descending module is used for controlling the window to stop descending in response to the detection of the obstacle.
Optionally, the apparatus further comprises:
the abnormal image acquisition module is used for detecting the current use process of the fume hood based on an image detection device installed on the fume hood and acquiring an abnormal image;
and the sending module is used for sending the abnormal image to terminal equipment of a laboratory worker based on the wifi communication module.
In the embodiment of the disclosure, the device firstly obtains the surface wind speed of the fume hood, then responds to the situation that the surface wind speed does not meet the preset requirement, calculates the exhaust air quantity value required by the current fume hood based on the opening of the fume hood window displacement sensor and the set surface wind speed value, and then controls the air quantity of the variable air quantity butterfly valve based on the exhaust air quantity value. From this, can control the amount of wind of variable air volume butterfly valve and satisfy fume chamber volume of airing exhaust demand, keep a face wind speed stable, guarantee experimental safety and personnel's safety.
In order to implement the foregoing embodiment, the present disclosure further provides a computer device, including: the present invention relates to a motor synchronous control method, and more particularly to a motor synchronous control method, a motor synchronous control device, and a motor synchronous control method.
In order to achieve the above embodiments, the present disclosure also proposes a non-transitory computer readable storage medium storing a computer program which, when executed by a processor, implements the motor synchronization control method as proposed by the foregoing embodiments of the present disclosure.
In order to implement the foregoing embodiments, the present disclosure also proposes a computer program product, which, when being executed by an instruction processor in the computer program product, executes the motor synchronization control method proposed by the foregoing embodiments of the present disclosure.
FIG. 5 illustrates a block diagram of an exemplary computer device suitable for use in implementing embodiments of the present disclosure. The computer device 12 shown in fig. 5 is only one example and should not impose any limitations on the functionality or scope of use of embodiments of the present disclosure.
As shown in FIG. 5, computer device 12 is in the form of a general purpose computing device. The components of computer device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, and a bus 18 that couples various system components including the system memory 28 and the processing unit 16.
Computer device 12 typically includes a variety of computer system readable media. Such media may be any available media that is accessible by computer device 12 and includes both volatile and nonvolatile media, removable and non-removable media.
A program/utility 40 having a set (at least one) of program modules 42 may be stored, for example, in memory 28, such program modules 42 including but not limited to an operating system, one or more application programs, other program modules, and program data, each of which or some combination of which may comprise an implementation of a network environment. Program modules 42 generally carry out the functions and/or methodologies of the embodiments described in this disclosure.
Computer device 12 may also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), with one or more devices that enable a user to interact with computer device 12, and/or with any devices (e.g., network card, modem, etc.) that enable computer device 12 to communicate with one or more other computing devices. Such communication may be through an input/output (I/O) interface 22. Moreover, computer device 12 may also communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public Network such as the Internet) via Network adapter 20. As shown, network adapter 20 communicates with the other modules of computer device 12 via bus 18. It should be understood that although not shown in the figures, other hardware and/or software modules may be used in conjunction with computer device 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.
The processing unit 16 executes various functional applications and data processing, for example, implementing the methods mentioned in the foregoing embodiments, by running a program stored in the system memory 28.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present disclosure in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present disclosure.
The logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present disclosure may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present disclosure may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer-readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure, and that changes, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present disclosure.
Claims (10)
1. A variable air volume control method for a fume hood is characterized by comprising the following steps:
acquiring the surface wind speed of the fume hood;
in response to the fact that the surface wind speed does not meet the preset requirement, calculating an exhaust air quantity value required by the current fume hood based on the opening of the fume hood window displacement sensor and the set surface wind speed value;
and controlling the air quantity of the variable air quantity butterfly valve based on the air exhaust quantity value.
2. The method of claim 1, further comprising, prior to said calculating a current required draft value for a fumehood based on an opening of said fumehood window displacement sensor and a set face wind speed value:
and determining a set surface wind speed value corresponding to the working mode of the fume hood based on a preset mapping relation.
3. The method according to claim 2, before determining the set face wind speed value corresponding to the operation mode of the fume hood based on the preset mapping relationship, further comprising:
in response to the detection of the worker based on the area presence sensor, controlling the window to reach a set safety height, and detecting the departure time of the worker;
and controlling the working mode of the fume hood to enter an energy-saving mode in response to the fact that the time difference between the leaving time of the staff and the current moment is larger than the set time.
4. The method of claim 1, further comprising, after said obtaining a face velocity of the fumehood:
and when the surface wind speed is determined to be smaller than the preset value, carrying out alarm prompt based on a touch screen man-machine exchange interface, and displaying the operation parameters of the exhaust fan of the fume hood through the touch screen man-machine exchange interface, wherein the operation parameters comprise the surface wind speed, the operation state of the exhaust fan and the static pressure value in the air pipe.
5. The method of claim 1, wherein the variable air volume butterfly valve is mounted on top of the fume hood and is connected to an air duct.
6. The method according to claim 1, before determining the set face wind speed value corresponding to the operation mode of the fume hood based on the preset mapping relationship, further comprising:
detecting the air flow passing through an air valve based on an air volume sensor in a controller, and detecting the window opening height of the fume hood;
and in response to the detection that the window opening height of the fume hood is greater than the set working height or the air flow is greater than a preset threshold value, updating the current working mode of the fume hood.
7. The method of claim 6, wherein the controller is configured to:
controlling the position of the automatic door based on the automatic door controller;
carrying out closed-loop control on the surface wind speed;
and supporting ModbusRTU networking operation.
8. The method of claim 1, further comprising:
detecting the automatic descending process of the viewing window through an anti-pinch infrared sensor;
in response to detecting the obstruction, controlling the window to stop descending.
9. The method of claim 1, further comprising:
detecting the current use process of the fume hood based on an image detection device installed on the fume hood, and acquiring an abnormal image;
and based on a wifi communication module, sending the abnormal image to terminal equipment of a laboratory worker.
10. A variable air volume control device of a fume hood is characterized by comprising:
the acquisition module is used for acquiring the surface wind speed of the fume hood;
the calculation module is used for responding to the situation that the surface wind speed does not meet the preset requirement, and calculating the exhaust air quantity value required by the current fume hood based on the opening of the fume hood window displacement sensor and the set surface wind speed value;
and the control module is used for controlling the air quantity of the variable air quantity butterfly valve based on the air exhaust quantity value.
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| CN202211705336.9A CN115971194A (en) | 2022-12-29 | 2022-12-29 | Variable air volume control method and device for fume hood |
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| CN202211705336.9A CN115971194A (en) | 2022-12-29 | 2022-12-29 | Variable air volume control method and device for fume hood |
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Cited By (1)
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