CN107282582B - Fume hood variable air volume control system with multiple ventilation control modes - Google Patents
Fume hood variable air volume control system with multiple ventilation control modes Download PDFInfo
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- CN107282582B CN107282582B CN201710540269.2A CN201710540269A CN107282582B CN 107282582 B CN107282582 B CN 107282582B CN 201710540269 A CN201710540269 A CN 201710540269A CN 107282582 B CN107282582 B CN 107282582B
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- 239000003517 fume Substances 0.000 title claims abstract description 149
- 238000009423 ventilation Methods 0.000 title claims abstract description 31
- 230000005540 biological transmission Effects 0.000 claims abstract description 15
- 230000001502 supplementing effect Effects 0.000 claims description 28
- 238000004891 communication Methods 0.000 claims description 22
- 230000001105 regulatory effect Effects 0.000 claims description 16
- 230000002159 abnormal effect Effects 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 239000004973 liquid crystal related substance Substances 0.000 claims description 4
- 230000001960 triggered effect Effects 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009323 psychological health Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/054—Input/output
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Ventilation (AREA)
Abstract
The invention relates to a fume hood variable air volume control system with multiple ventilation control modes, which comprises: the field control terminal and the remote monitoring terminal connected with the field control module in a wired or wireless mode, wherein the field control terminal comprises: the automatic ventilation control device comprises a plurality of fume hoods, a transmission device connected with fume hood panels of the fume hoods, an electric control valve connected with the transmission device, a micro switch connected with an encoder for detecting the pulling-up height of the fume hood, and a sub PLC controller connected with the encoder.
Description
Technical Field
The invention relates to a fume hood variable air volume control system with multiple ventilation control modes.
Background
The fume chamber is one of the important safety devices in the laboratory, is mainly used for discharging toxic, harmful and odorous gases generated in the experimental process, ensures the physical and psychological health of experimental staff and creates a comfortable and safe working environment. But current fume hood is mostly simple mechanical structure, and the ventilation volume of during operation fan is fixed unchangeable, can not open its ventilation volume of size adjustment along with experimental operation door, has not only wasted the electric energy, often still influences operation experiment effect.
The control system of the existing fume hood has the following problems:
the device for monitoring the pull-up height of the fume hood panel belongs to direct contact type and is easy to wear.
The device for monitoring the wind speed of the fume hood surface has no regulation amplitude limitation, and when the data of the device is inaccurate, the full opening or the full closing of the fume hood valve is easy to be caused, and the effect of regulating the wind quantity is lost.
The VAV control module is program-closed and cannot autonomously extend the ventilation control mode.
Monitoring the panel pull-up height of each fume hood using a remote terminal cannot be achieved.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a fume hood variable air volume control system with multiple ventilation control modes, which can accurately adjust the lifting height of a ventilation panel.
The invention relates to a fume hood variable air volume control system with multiple ventilation control modes, which comprises: a plurality of fume hoods, a set of on-site control terminals and a total control terminal corresponding to each fume hood, wherein,
the field control terminal includes: the device comprises a transmission device connected with fume hood panels of each fume hood, and an encoder connected with the transmission device and used for detecting the pulling height of the fume hood panels, wherein the encoder is connected with a sub-PLC (programmable logic controller) which is connected with a fume hood ventilation control mode button to obtain a fume ventilation control mode of the fume hood;
the main control terminal comprises a main control PLC and a bus communication repeater, wherein each main control PLC comprises two communication ports, one communication port is used for collecting the panel pulling-up heights of all the fume hoods of the laboratory and the current ventilation control mode of each fume hood through the sub control PLC, the other communication port is connected with a PC terminal through the bus communication repeater, the PC terminal records the heights of all the fume hood panels in real time, analyzes the stay time of each fume hood panel in normal and abnormal working areas and displays the stay time on a fume hood control liquid crystal screen, the maximum normal stretching height of the fume hood panel is 50cm, the normal working area is the maximum normal stretching height of the fume hood panel is not higher than 50cm, and the abnormal working area is the maximum stretching height of the fume hood panel is higher than 50 cm; the panel height should be reduced to below 10cm when the experimenter leaves the fume hood, if the experimenter leaves the fume hood, the fume hood panel height is higher than 10cm, the fume hood is an abnormal working area, and if the experimenter leaves the fume hood, the fume hood panel height is lower than 10cm, the fume hood is a normal working area;
the main control PLC is connected with an air supplementing frequency converter, an air supplementing frequency conversion fan, an air exhausting frequency converter and an air exhausting frequency conversion fan; the main control PLC acquires the pulling height of each fume hood panel and the ventilation control mode data, and the operation frequency of the air exhaust frequency converter is calculated and regulated by combining the wind pressure of the air exhaust main air pipe; according to the running frequency of the air supplementing frequency converter, the frequency of the air supplementing frequency converter is adjusted by combining the air quantity proportion of the air exhausting and air supplementing machines, and then the frequency of the air exhausting and air supplementing frequency converter is finely adjusted according to the air pressure of the air exhausting and air supplementing main air pipe.
Further, the control of the ventilation control mode of the fume hood at least comprises a normal mode, a full-open or a horizontal-open small window mode, wherein the normal mode is as follows: the sub-PLC is used for collecting pulse signals of the encoder according to rotation of the encoder, converting the pulse signals into actual positions of the fume hood panel, adjusting the electric regulating valve corresponding to the fume hood exhaust pipeline to a pre-designated position according to the converted positions, and adjusting the electric regulating valve according to the breeze pressure sensor.
Further, the wind speed requirement of the fume hood surface is between 0.5m/s and plus or minus 10%, and the wind pressure in the current wind pipe is determined according to the model of the fume hood and the size of the wind pipe provided with the electric regulating valve
Further, the transmission device is driven by a steel wire rope or a toothed belt for connecting the fume hood panel and the counterweight of the panel, and the moving signal is converted into a pulse signal through the transmission device.
Further, the encoder is an incremental AB-phase photoelectric encoder.
Further, a micro switch is arranged in a height range of the fume hood panel which is frequently used, when the fume hood panel is lifted to a preset height, the panel can contact the micro switch, so that the micro switch is triggered, and when the micro switch of the panel acts, the pulse number collected by the sub-control PLC is forcedly set to be a pre-designated pulse number, and the calibration of the pulse number is completed.
Compared with the prior art, the invention has the following advantages:
durability: the device for detecting the height of the panel is changed into a photoelectric encoder, so that the abrasion resistance of the device is greatly improved compared with that of devices such as a pull rope resistor.
The fine adjustment amplitude can be limited according to the actual situation, and abnormal full opening or full closing of the air valve caused by inaccurate pressure difference is avoided.
Scalability, the ventilation control mode can be changed according to the specific needs within the plant.
The operation state of each fume hood is monitored and recorded in real time, and the fume hoods which are improperly used can be analyzed according to data recording, so that adjustment is timely notified, and waste of air quantity is avoided.
Drawings
FIG. 1 is a block diagram of a fume hood variable air volume control system of the present invention in a multiple ventilation control mode.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
The preferred embodiment of the fume hood variable air volume control system of the present invention with multiple ventilation control modes comprises: a plurality of fume hoods, a set of on-site control terminals and a total control terminal corresponding to each fume hood, wherein,
the field control terminal includes: the device comprises a transmission device connected with fume hood panels of each fume hood, and an encoder connected with the transmission device and used for detecting the pulling height of the fume hood panels, wherein the encoder is connected with a sub-PLC (programmable logic controller) which is connected with a fume hood ventilation control mode button to obtain a fume ventilation control mode of the fume hood;
the main control terminal comprises a main control PLC and a bus communication repeater, wherein each main control PLC comprises two communication ports, one communication port is used for collecting the panel pulling-up heights of all the fume hoods of the laboratory and the current ventilation control mode of each fume hood through the sub control PLC, the other communication port is connected with a PC terminal through the bus communication repeater, the PC terminal records the heights of all the fume hood panels in real time, analyzes the stay time of each fume hood panel in normal and abnormal working areas and displays the stay time on a fume hood control liquid crystal screen, wherein the maximum normal stretching height of the fume hood panel is 50cm, if the stretching height of the fume hood panel is not higher than 50cm, the fume hood panel is a normal working area, and if the stretching height of the fume hood panel is higher than 50cm, the fume hood panel is an abnormal working area; the panel height should be reduced to below 10cm when the experimenter leaves the fume hood, if the experimenter leaves the fume hood, the fume hood panel height is higher than 10cm, the fume hood is an abnormal working area, and if the experimenter leaves the fume hood, the fume hood panel height is lower than 10cm, the fume hood is a normal working area; above, above including the original value, below not including the original value.
According to the regulations that the maximum normal stretching height of the fume hood panel is 50cm (the panel drawable height will exceed this value), the experimenter should drop the panel height below 10cm when leaving the fume hood. The system can record the heights of all the fume hood panels in real time, analyze the stay time of each fume hood panel in normal and abnormal working areas, display the stay time on a fume hood control liquid crystal screen, and realize the subjective adherence of the experimenters to the fume hood using rules by combining with a corporate rewarding system.
In this embodiment, the transmission device is driven by a wire rope or toothed belt connecting the fume hood panel and the counterweight of the panel, and the movement signal is converted into a pulse signal by the transmission device. The existing structure is a pull rope resistor, is similar to a sliding resistor, and can wear a resistor disc when in use. In this embodiment, an optical-electrical encoder is used, and the internal detection device is an optical head and a code disc, which are not in physical contact.
The main control PLC is connected with an air supplementing frequency converter, an air supplementing frequency conversion fan, an air exhausting frequency converter and an air exhausting frequency conversion fan; the main control PLC acquires the pulling height of each fume hood panel and the ventilation control mode data, and the operation frequency of the air exhaust frequency converter is calculated and regulated by combining the wind pressure of the air exhaust main air pipe; according to the running frequency of the air supplementing frequency converter, the frequency of the air supplementing frequency converter is adjusted by combining the air quantity proportion of the air exhausting and air supplementing machines, and then the frequency of the air exhausting and air supplementing frequency converter is finely adjusted according to the air pressure of the air exhausting and air supplementing main air pipe.
The control of the ventilation control mode of the fume hood at least comprises a normal mode, a full-open or a horizontal-open small window mode, wherein the normal mode is as follows: the sub-PLC is used for collecting pulse signals of the encoder according to rotation of the encoder, converting the pulse signals into actual positions of the fume hood panel, adjusting the electric regulating valve corresponding to the fume hood exhaust pipeline to a pre-designated position according to the converted positions, and adjusting the electric regulating valve according to the breeze pressure sensor.
In the embodiment, the wind speed of the surface of the fume hood is required to be 0.5m/s plus or minus 10%, so that the wind pressure in the current wind pipe can be determined according to the model of the fume hood and the size of the wind pipe provided with the electric regulating valve.
For example, when the fume hood is closed or the panel height is lowered, the total fan frequency is correspondingly lowered, the wind speed and the wind pressure are also lowered, and at the moment, the surface wind speed of the fume hood in an operating state is influenced to be lowered, so that the electric actuator needs to be finely tuned according to the current total fan operating frequency, and in order to prevent signal faults from causing the electric actuator to be adjusted to an on limit or an off limit, the fine tuning amplitude is limited.
A micro switch is arranged in a height range of a fume hood panel which is frequently used, when the fume hood panel is lifted to a preset height, the panel can contact the micro switch, so that the micro switch is triggered, and when the micro switch of the panel acts, the pulse number collected by the sub-control PLC is forcedly set to be a pre-designated pulse number, so that the calibration of the pulse number is completed once. For example: the micro-switch is arranged at the top of the fume hood, and when the fume hood panel is lifted to a certain height (determined according to the specific structure of the fume hood), the panel can contact the micro-switch, so that the micro-switch is triggered.
The sub-control system of each fume hood in this embodiment includes: the manual control valve, the electric control valve (butterfly valve), the increment type AB phase photoelectric encoder (comprising a bracket), the micro-switch (comprising a fixed seat), the sub-control PLC, the mode selection button and the breeze pressure sensor.
When the pulling height of the fume hood panel changes, the encoder is driven to rotate by the transmission device (such as a steel wire rope, a grooved pulley or a synchronous belt and a synchronous wheel) of the fume hood, and the pulse signal of the encoder is collected by the high-speed counting function of the sub-control PLC and converted into the actual position of the fume hood panel. And quickly adjusting the electric regulating valve of the exhaust pipeline of the corresponding fume hood to a pre-designated position according to the converted position, and finely adjusting the electric regulating valve within a pre-limited range according to the micro-wind pressure sensor. When the fume hood needs an emergency full-open or a side-by-side small window mode, a desired fume control mode is selected by a mode selection button.
Because some equipment problems can cause the encoder to lose pulse signals and cause counting errors, a micro switch is added in the height range of the fume hood panel which is frequently used, and the pulse number collected by the sub-control PLC is forcedly set to be the pre-designated pulse number when the micro switch acts, so that the calibration of the pulse number is completed once, and the errors are reduced.
Each laboratory comprises one or more fume hoods, and comprises a main control PLC and a bus communication repeater, wherein each main control PLC comprises two communication ports, one copper whisker port is used for collecting the panel pull-up heights of all the fume hoods of the laboratory and the ventilation control mode of each fume hood at present through a subcontrol PLC, and the other communication port is connected with the communication port of the main control PLC through the bus communication repeater.
Each set of variable air volume control system comprises one or more than one laboratory, and all the main control PLCs are connected to the main control PLCs through bus communication relays of the laboratories.
The total control part of each set of variable air volume system comprises a main control PLC module, an air supplementing frequency converter, an air supplementing frequency conversion fan, an air exhausting frequency converter and an air exhausting frequency conversion fan. The main control PLC collects the data of the pulling height and the ventilation control mode of each fume hood panel, and the operation frequency of the air exhaust frequency converter is calculated and regulated by combining the wind pressure of the air exhaust main air pipe. And (3) according to the running frequency of the air supplementing frequency converter, the frequency of the air supplementing frequency converter is approximately adjusted by combining the air quantity proportion of the air exhausting and air supplementing machines, and then the frequency of the air exhausting and air supplementing frequency converter is finely adjusted according to the air pressure of the air exhausting and air supplementing main air pipe.
And uploading all data in the variable air volume system to a PC terminal by a total control module, and recording the data and generating alarm information by the PC terminal.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and it should be noted that it is possible for those skilled in the art to make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims (4)
1. A fume hood variable air volume control system of a multiple ventilation control mode, comprising: more than one laboratory, a plurality of fume hoods, a set of field control terminals and a total control terminal corresponding to each fume hood, wherein,
the field control terminal includes: the device comprises a transmission device connected with fume hood panels of each fume hood, and an encoder connected with the transmission device and used for detecting the pulling height of the fume hood panels, wherein the encoder is connected with a sub PLC (programmable logic controller) which is connected with a fume hood fume control mode button to obtain a fume hood fume control mode;
the control of the ventilation control mode of the fume hood at least comprises a normal mode, a full-open or a horizontal-open small window mode, wherein the normal mode is as follows: the sub PLC acquires pulse signals of the encoder according to the rotation of the encoder, converts the pulse signals into the actual position of a fume hood panel, adjusts an electric regulating valve corresponding to an exhaust pipeline of the fume hood to a pre-designated position according to the converted position, and adjusts the electric regulating valve according to the breeze pressure sensor;
the main control terminal comprises a main control PLC and a bus communication repeater, each main control PLC comprises two communication ports, all sub-control PLCs are connected to the main control PLC through the bus communication repeater of each laboratory, one communication port collects the panel pulling height of all the fume hoods of the laboratory and the current ventilation control mode of each fume hood through the sub-control PLC, the other communication port is connected with the PC terminal through the bus communication repeater, the PC terminal records the panel heights of all the fume hoods in real time, analyzes the residence time of each fume hood panel in normal and abnormal working areas and displays the residence time on a fume hood control liquid crystal screen, wherein the maximum normal stretching height of the fume hood panel is 50cm, the fume hood panel is a normal working area if the stretching height of the fume hood panel is not higher than 50cm, and the fume hood panel is an abnormal working area if the stretching height of the fume hood panel is higher than 50 cm; the panel height should be reduced to below 10cm when the experimenter leaves the fume hood, if the experimenter leaves the fume hood, the fume hood panel height is higher than 10cm, the fume hood is an abnormal working area, and if the experimenter leaves the fume hood, the fume hood panel height is lower than 10cm, the fume hood is a normal working area;
a micro switch is arranged in the frequently used height range of the fume hood panel, when the fume hood panel is lifted to a preset height, the panel contacts the micro switch, so that the micro switch is triggered, and when the micro switch of the panel acts, the pulse number collected by the sub-control PLC is forcedly set to be the pre-designated pulse number, so that the calibration of the pulse number is completed once;
the main control PLC is connected with an air supplementing frequency converter, an air supplementing frequency conversion fan, an air exhausting frequency converter and an air exhausting frequency conversion fan; the main control PLC acquires the pulling height of each fume hood panel and the ventilation control mode data, and the operation frequency of the air exhaust frequency converter is calculated and regulated by combining the wind pressure of the air exhaust main air pipe; according to the running frequency of the air supplementing frequency converter, the frequency of the air supplementing frequency converter is adjusted by combining the air quantity proportion of the air exhausting and air supplementing machines, and then the frequency of the air exhausting and air supplementing frequency converter is finely adjusted according to the air pressure of the air exhausting and air supplementing main air pipe.
2. The variable air volume control system of the fume hood with the multiple ventilation control modes according to claim 1, wherein the air speed requirement of the fume hood surface is 0.5m/s plus or minus 10%, and the air pressure in the current air pipe is determined according to the type of the fume hood and the size of the air pipe provided with the electric regulating valve.
3. A multi-vent control mode fume hood variable air volume control system according to claim 1 wherein the transmission is driven by a wire rope or toothed belt connecting the fume hood panel and the panel weight, the movement signal being converted to a pulse signal by the transmission.
4. The multi-vent control mode fume hood variable air volume control system of claim 1, wherein the encoder is an incremental AB phase photoelectric encoder.
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| CN201710540269.2A CN107282582B (en) | 2017-07-05 | 2017-07-05 | Fume hood variable air volume control system with multiple ventilation control modes |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710540269.2A CN107282582B (en) | 2017-07-05 | 2017-07-05 | Fume hood variable air volume control system with multiple ventilation control modes |
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| CN107282582A CN107282582A (en) | 2017-10-24 |
| CN107282582B true CN107282582B (en) | 2024-01-30 |
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| CN109521726A (en) * | 2018-12-19 | 2019-03-26 | 广州九诺实业有限公司 | Laboratory ventilation robot control system(RCS) |
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| US5688168A (en) * | 1996-02-05 | 1997-11-18 | Fisher Hamilton Scientific Inc. | Fume hood with improved counterbalance system |
| CN201669255U (en) * | 2010-04-29 | 2010-12-15 | 苏州市安达净化工程技术有限公司 | Variable air volume ventilation cabinet |
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| DE102012105194A1 (en) * | 2012-06-15 | 2013-12-19 | Schneider Elektronik Gmbh | Fume hood apparatus has control device connected to sensor, to perform necessary comparison calculations, and optical relative indicator with display of average air flow rate per unit time in relation to preset reference values |
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2017
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5439414A (en) * | 1993-07-26 | 1995-08-08 | Landis & Gyr Powers, Inc. | Networked fume hood monitoring system |
| WO1995013146A1 (en) * | 1993-11-09 | 1995-05-18 | Stasch Karl Heinz | A computerized ventilation system |
| JPH09170794A (en) * | 1995-12-19 | 1997-06-30 | Itoki Crebio Corp | Exhaust control device of draft chamber |
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| CN107282582A (en) | 2017-10-24 |
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