CN113357727A - Variable-frequency variable-air-volume air pressure balance system and method for laboratory waste gas treatment equipment - Google Patents
Variable-frequency variable-air-volume air pressure balance system and method for laboratory waste gas treatment equipment Download PDFInfo
- Publication number
- CN113357727A CN113357727A CN202110574745.9A CN202110574745A CN113357727A CN 113357727 A CN113357727 A CN 113357727A CN 202110574745 A CN202110574745 A CN 202110574745A CN 113357727 A CN113357727 A CN 113357727A
- Authority
- CN
- China
- Prior art keywords
- air
- exhaust
- pressure
- control terminal
- indoor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/003—Ventilation in combination with air cleaning
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/0001—Control or safety arrangements for ventilation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
- F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
- F24F7/08—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit with separate ducts for supplied and exhausted air with provisions for reversal of the input and output systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
- F24F8/15—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
- F24F8/15—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means
- F24F8/158—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means using active carbon
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F2007/001—Ventilation with exhausting air ducts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/30—Velocity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/40—Pressure, e.g. wind pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/50—Air quality properties
- F24F2110/65—Concentration of specific substances or contaminants
- F24F2110/76—Oxygen
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Fluid Mechanics (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a frequency conversion variable air volume and air pressure balance system and a method for laboratory waste gas treatment equipment, wherein the system comprises an air feeder, an exhaust fan, an air feeding pipe, an exhaust pipe, an air feeding quantity regulating valve, an air discharging quantity regulating valve, a pressure sensor, an air quantity sensor, a frequency conversion controller and a control terminal module; the blower is communicated with a plurality of indoor spaces through air supply pipes respectively, and each air supply pipe is provided with an air supply quantity regulating valve; the exhaust fan is communicated with a plurality of indoor spaces through exhaust air pipes respectively, and each exhaust air pipe is provided with an exhaust air quantity regulating valve; pressure sensors are arranged in the plurality of indoor spaces and used for acquiring indoor real-time pressure values; the control terminal module is used for receiving the indoor real-time pressure value transmitted by the pressure sensor and the wind speed value transmitted by the wind sensor, controlling the working states of the air supply and air volume regulating valve, the air exhaust and air volume regulating valve, the air blower and the exhaust fan in real time, effectively keeping the indoor pressure stable and flexibly controlling the indoor pressure.
Description
Technical Field
The invention relates to the technical field of ventilation control, in particular to a frequency conversion variable air volume and air pressure balance system and method for laboratory waste gas treatment equipment.
Background
In the experimentation, the poisonous and harmful gas that produces can bring very big harm to the laboratory staff, for the physical and mental health of protection laboratory staff and the experimental environment of the safety in the protection laboratory, just need discharge the poisonous and harmful gas laboratory, discharge the poisonous and harmful gas in the atmosphere through not handling, can influence natural environment, pollute the atmosphere, influence human existence, so, must just can discharge after handling.
In a ventilation system of a laboratory, a plurality of waste gas treatment devices are connected together, when a frequency conversion system is adopted for control, the air quantity of a main air pipe can only be controlled, a fan can be correspondingly adjusted only by sensing the change of the air pressure of the main air pipe, and the surface air speed at the tail end of the waste gas treatment device can not be adjusted at all.
Disclosure of Invention
The technical purpose is as follows: the invention discloses a variable-frequency variable-air-volume wind pressure balance system and method for laboratory waste gas treatment equipment, aiming at the defects that the variable-air-volume requirement and the constant surface wind speed at the tail end of the waste gas treatment equipment are difficult to realize in the prior art.
The technical scheme is as follows: in view of the above technical objects, the present invention adopts the following technical solutions.
A frequency conversion variable air volume and air pressure balance system for laboratory waste gas treatment equipment comprises an air feeder, an exhaust fan, an air supply pipe, an exhaust pipe, a pressure sensor, an air volume sensor, a frequency conversion controller and a control terminal module;
the air feeder is communicated with the indoor spaces through air feeding pipes respectively, the exhaust fan is communicated with the indoor spaces through air exhaust pipes respectively, and air quantity sensors are arranged at the air feeder and the exhaust fan respectively and used for measuring air quantities at the air inlet and the air outlet respectively; pressure sensors are arranged in the plurality of indoor spaces and used for acquiring indoor real-time pressure values;
the control terminal module is connected with all pressure sensors and air volume sensors, is also connected with a variable frequency controller, is respectively connected with the air feeder and the exhaust fan, and is used for receiving indoor real-time pressure values transmitted by the pressure sensors and air speed values transmitted by the air volume sensors, controlling the air feeding air volume regulating valve and the air exhaust air volume regulating valve in real time and controlling the working states of the air feeder and the exhaust fan through the variable frequency controller.
Preferably, the system is also provided with an air supply volume adjusting valve and an air exhaust volume adjusting valve; each blast pipe is provided with a blast air volume adjusting valve; each exhaust pipe is provided with an exhaust air volume regulating valve; the air supply air volume adjusting valve and the air exhaust air volume adjusting valve are both connected with the control terminal module and used for adjusting the valve opening under the control of the control terminal module.
Preferably, the control terminal module comprises a PLC controller and an operable control panel, and can monitor and adjust the control parameters of the system in real time through the operable control panel.
Preferably, when the control terminal module is connected with all the pressure sensors and the air volume sensors, the pressure sensors and the air volume sensors transmit signals in an R485 analog quantity communication mode.
Preferably, the system further comprises an activated carbon waste gas treatment device, wherein the activated carbon waste gas treatment device is arranged at an air inlet of the exhaust fan and is used for treating waste gas generated in the laboratory and then exhausting the waste gas through the exhaust fan; the pressure sensors are arranged at the front end of the air inlet and the air outlet of the activated carbon waste gas treatment equipment, the activated carbon waste gas treatment equipment is connected with the control terminal module, the pressure sensors acquire pressure values before and after treatment of the activated carbon waste gas treatment equipment in real time, and the real-time pressure values are sent to the control terminal module in an R485 analog quantity communication mode.
Preferably, the system further comprises an oxygen sensor, the oxygen sensor is arranged at the air outlet and connected with the control terminal module, and the oxygen sensor is used for measuring the oxygen concentration in the indoor air and sending the measured oxygen concentration information to the control terminal module.
A frequency conversion variable air volume wind pressure balance method for laboratory waste gas treatment equipment is applied to any one of the frequency conversion variable air volume wind pressure balance system for laboratory waste gas treatment equipment, and comprises the following steps:
s1, the pressure sensor and the air volume sensor acquire the pressure value and the air speed value of each indoor space in real time, and send the real-time pressure value and the air speed value to the control terminal module in an R485 analog quantity communication mode;
s2, the control terminal module compares the indoor real-time pressure value of the pressure sensor and the indoor real-time wind speed value of the wind sensor with a preset indoor target pressure interval and a preset target wind speed interval, and controls the opening of the air supply and air exhaust regulating valves and the working state of the variable frequency controller according to the comparison result;
and S3, the variable frequency controller receives the driving frequency change sent by the control terminal module, and further controls the rotating speed of the air blower and the exhaust fan.
Preferably, the specific process of step S2 includes:
the pressure sensor sends an indoor real-time pressure value to the control terminal module, and if the indoor real-time pressure value is P1Greater than the indoor target pressure interval [ Pmin，Pmax]Maximum target pressure P ofmaxThen the control terminal module calculates and feeds back signals to the air supply air volume adjusting valve to reduce the opening angle of the air supply air volume adjusting valve, and simultaneously feeds back signals to the air exhaust air volume adjusting valve to increase the opening angle of the air exhaust air volume adjusting valve, so that the indoor real-time pressure value P is enabled1Reduced until the indoor real-time pressure value P1To achieve the goalSet indoor target pressure interval [ P ]min，Pmax](ii) a If the indoor real-time pressure value P1Less than the indoor target pressure interval [ Pmin，Pmax]Minimum target pressure P ofminThen the control terminal module calculates and feeds back signals to the air supply air quantity regulating valve to increase the opening angle of the air supply air quantity regulating valve, and simultaneously feeds back signals to the air exhaust air quantity regulating valve to reduce the opening angle of the air exhaust air quantity regulating valve so as to enable the indoor real-time pressure value P to be1Increasing until the indoor real-time pressure value P1Reach the preset indoor target pressure interval [ Pmin，Pmax]；
The air quantity sensor sends an indoor real-time air speed value to the control terminal module, and if the indoor real-time air speed value is V1Greater than the target wind speed interval [ Vmin，Vmax]Maximum target wind speed VmaxThe control terminal module calculates and feeds back signals to the air blower and the air supply regulating valve to reduce the air supply quantity of the air blower and the opening angle of the air supply regulating valve, and simultaneously feeds back signals to the exhaust fan and the exhaust regulating valve to reduce the exhaust quantity of the exhaust fan and reduce the opening angle of the exhaust regulating valve until the indoor real-time air speed value V is reached1Reaches a preset target wind speed interval Vmin，Vmax](ii) a If the indoor real-time wind speed value V1Less than the target wind speed interval [ V ]min，Vmax]Minimum target wind speed V inminThe control terminal module calculates and feeds back signals to the air blower and the air supply regulating valve to increase the air supply quantity of the air blower and increase the opening angle of the air supply regulating valve, and simultaneously feeds back signals to the exhaust fan and the exhaust regulating valve to increase the exhaust quantity of the exhaust fan and increase the opening angle of the exhaust regulating valve until the indoor real-time air speed value V is reached1Reaches a preset target wind speed interval Vmin，Vmax]。
Preferably, step S2 further includes: the control terminal module compares the indoor real-time oxygen concentration value of the oxygen sensor with a preset indoor target oxygen concentration interval, controls the opening of the air supply air quantity regulating valve and the air exhaust air quantity regulating valve and the working state of the variable frequency controller according to the comparison result, and the specific process is as follows:
the method comprises the steps that an oxygen sensor sends indoor real-time oxygen concentration values to a control terminal module, when laboratory experimenters increase, oxygen in a laboratory is excessively consumed, or a large amount of waste gas is generated in an experimental process, so that the concentration of the oxygen in the laboratory is reduced, when the real-time oxygen concentration values monitored by the oxygen sensor are lower than the minimum oxygen concentration of an indoor target oxygen concentration range, the control terminal module calculates and feeds back signals to a blower and a blower adjusting valve, so that the air supply amount of the blower is increased, the opening angle of the blower adjusting valve is increased, the input of fresh air is increased, the control terminal module simultaneously feeds back signals to an exhaust fan and an exhaust adjusting valve, the exhaust amount of the exhaust fan is increased, the opening angle of the exhaust adjusting valve is increased, the exhaust of the indoor waste gas is accelerated, and the indoor oxygen concentration values reach the preset indoor target oxygen concentration range; and vice versa.
Preferably, the first and second electrodes are formed of a metal,
the exhaust fan is also used for discharging the waste gas reaching the standard to the atmosphere, when the exhaust fan is started, negative pressure is formed in an exhaust air pipe, the waste gas generated in a laboratory is sucked, adsorbed, filtered and sprayed for neutralization through activated carbon waste gas treatment equipment, and the waste gas reaching the standard is discharged to the atmosphere through the exhaust fan; the front end of the air inlet and the air outlet of the active carbon waste gas treatment equipment are provided with pressure sensors, and the control terminal module obtains real-time pressure values P in the air pipe before waste gas treatment in real time according to the pressure sensors2And the real-time pressure value P in the air duct after the waste gas treatment3Calculating the differential pressure Δ P ═ P2-P3) And comparing and feeding back according to the comparison result, specifically comprising:
when the differential pressure delta P before and after the waste gas treatment is too large and is larger than the preset target differential pressure delta P0When the adsorption capacity of the adsorbent in the activated carbon waste gas treatment equipment tends to saturation, the control terminal module calculates and feeds back signals, and gives an alarm to prompt the replacement of the adsorbent in the activated carbon waste gas treatment equipment; otherwise, the adsorbent in the activated carbon waste gas treatment equipment is not replaced;
the method comprises the steps that a waste gas treatment and spraying neutralization process is carried out inside the activated carbon waste gas treatment equipment, the activated carbon waste gas treatment equipment monitors the water level line of spraying circulating liquid in real time and sends the water level line to a control terminal module, when the actual water level line of the spraying circulating liquid is lower than the lowest water level line preset in the control terminal module, the control terminal module calculates and feeds back signals to the activated carbon waste gas treatment equipment, the activated carbon waste gas treatment equipment is controlled to carry out automatic liquid supplementing, and when the highest water level line is reached, liquid supplementing is automatically stopped;
the active carbon exhaust-gas treatment equipment still monitors the PH value that sprays the circulating fluid in real time to send for the control terminal module, when the real-time PH value that sprays the circulating fluid is not in the control terminal module when predetermineeing the target PH value interval, control terminal module feedback signal to active carbon exhaust-gas treatment equipment, in the control active carbon exhaust-gas treatment equipment is with waste liquid exhaust's waste liquid collection device, and the new circulating fluid that sprays of automatic replenishment. .
Has the advantages that: the invention can effectively keep the indoor pressure stable, flexibly adjust and control the indoor pressure by the design of the controller, the pressure sensor, the air supply and air quantity adjusting valve, the air exhaust and air blower, the exhaust fan and the like, has high adjusting speed and good effect, effectively ensures the physical and mental health of laboratory workers, discharges the waste gas reaching the standard to the atmosphere, effectively protects the environment and ensures that the living environment of human beings is not damaged.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a block diagram of the system connections of the present invention;
FIG. 3 is a schematic diagram of the connection between the control terminal module and the blower and the exhaust fan according to the present invention;
FIG. 4 is a general process flow diagram of the present invention.
Detailed Description
The system and method for frequency-conversion and variable-air-volume wind pressure balance of laboratory waste gas treatment equipment according to the present invention will be further described and explained with reference to the accompanying drawings.
As shown in fig. 1 and fig. 2, a variable-frequency variable-air-volume wind pressure balance system for a laboratory waste gas treatment device comprises a blower, an exhaust fan, an air supply pipe, an exhaust pipe, a pressure sensor, an air volume sensor, a variable-frequency controller and a control terminal module;
the blower is communicated with the indoor spaces through air supply pipes respectively, the exhaust fan is communicated with the indoor spaces through air exhaust pipes respectively, and air quantity sensors are arranged at the blower and the exhaust fan respectively and used for measuring air quantities at an air inlet and an air outlet respectively; pressure sensors are arranged in the plurality of indoor spaces and used for acquiring indoor real-time pressure values;
the control terminal module is connected with all pressure sensors and air volume sensors, is also connected with a variable frequency controller, is respectively connected with the air feeder and the exhaust fan, and is used for receiving indoor real-time pressure values transmitted by the pressure sensors and air speed values transmitted by the air volume sensors, controlling the air feeding air volume regulating valve and the air exhaust air volume regulating valve in real time and controlling the working states of the air feeder and the exhaust fan through the variable frequency controller.
Wherein, the system is also provided with an air supply volume adjusting valve and an air exhaust volume adjusting valve; each blast pipe is provided with a blast air volume adjusting valve; each exhaust pipe is provided with an exhaust air volume regulating valve; the air supply air volume adjusting valve and the air exhaust air volume adjusting valve are both connected with the control terminal module and used for adjusting the valve opening under the control of the control terminal module. Wherein, the air supply volume regulating valve and the air exhaust volume regulating valve both adopt electric volume regulating valves.
The control terminal module comprises a PLC controller and an operable control panel, and can monitor and adjust the control parameters of the system in real time through the operable control panel. And in the connection of the control terminal module with all the pressure sensors and the air volume sensors, the pressure sensors and the air volume sensors transmit signals in an R485 analog quantity communication mode.
In addition, the system also comprises an active carbon waste gas treatment device, wherein the active carbon waste gas treatment device is arranged at the air inlet of the exhaust fan and is used for treating waste gas generated in the laboratory and then exhausting the waste gas through the exhaust fan; the pressure sensors are arranged at the front end of the air inlet and the air outlet of the activated carbon waste gas treatment equipment, the activated carbon waste gas treatment equipment is connected with the control terminal module, the pressure sensors acquire pressure values before and after treatment of the activated carbon waste gas treatment equipment in real time, and the real-time pressure values are sent to the control terminal module in an R485 analog quantity communication mode.
Simultaneously, this system still includes oxygen sensor, oxygen sensor sets up in air outlet department, and oxygen sensor is connected with control terminal module for the oxygen concentration in the measurement room air, and with measured oxygen concentration information transmission to control terminal module.
As shown in fig. 3, the control terminal module is further connected to a variable frequency controller, the variable frequency controller is respectively connected to the blower and the exhaust fan, wherein the variable frequency controller is a three-phase variable frequency controller, one end of the variable frequency controller is connected to the ac three-phase voltage, and the other end of the variable frequency controller is connected to the blower and the exhaust fan.
As shown in fig. 4, a method for balancing variable-frequency and variable-air-volume wind pressure of a laboratory waste gas treatment device is applied to any one of the systems for balancing variable-frequency and variable-air-volume wind pressure of a laboratory waste gas treatment device, and comprises the following steps:
s1, the pressure sensor and the air volume sensor acquire the pressure value and the air speed value of each indoor space in real time, and send the real-time pressure value and the air speed value to the control terminal module in an R485 analog quantity communication mode;
s2, the control terminal module compares the indoor real-time pressure value of the pressure sensor and the indoor real-time wind speed value of the wind sensor with a preset indoor target pressure interval and a preset target wind speed interval, and controls the opening of the air supply and air exhaust regulating valves and the working state of the variable frequency controller according to the comparison result;
and S3, the variable frequency controller receives the driving frequency change sent by the control terminal module, and further controls the rotating speed of the air blower and the exhaust fan.
The specific process of step S2 includes:
the pressure sensor sends an indoor real-time pressure value to the control terminal module, and if the indoor real-time pressure value is P1Greater than the indoor target pressure interval [ Pmin，Pmax]Maximum target pressure P ofmaxThen the control terminal module calculates and feeds back signals to the air supply air volume adjusting valve to reduce the opening angle of the air supply air volume adjusting valve, and simultaneously feeds back signals to the air exhaust air volume adjusting valve to increase the opening angle of the air exhaust air volume adjusting valve, so that the indoor real-time pressure value P is enabled1Reduced until the indoor real-time pressure value P1Reach the preset indoor target pressure interval [ Pmin，Pmax](ii) a If the indoor real-time pressure value P1Less than the indoor target pressure interval [ Pmin，Pmax]Minimum target pressure P ofminThen the control terminal module calculates and feeds back signals to the air supply air quantity regulating valve to increase the opening angle of the air supply air quantity regulating valve, and simultaneously feeds back signals to the air exhaust air quantity regulating valve to reduce the opening angle of the air exhaust air quantity regulating valve so as to enable the indoor real-time pressure value P to be1Increasing until the indoor real-time pressure value P1Reach the preset indoor target pressure interval [ Pmin，Pmax]；
The air quantity sensor sends an indoor real-time air speed value to the control terminal module, and if the indoor real-time air speed value is V1Greater than the target wind speed interval [ Vmin，Vmax]Maximum target wind speed VmaxThe control terminal module calculates and feeds back signals to the air blower and the air supply regulating valve to reduce the air supply quantity of the air blower and the opening angle of the air supply regulating valve, and simultaneously feeds back signals to the exhaust fan and the exhaust regulating valve to reduce the exhaust quantity of the exhaust fan and reduce the opening angle of the exhaust regulating valve until the indoor real-time air speed value V is reached1Reaches a preset target wind speed interval Vmin，Vmax](ii) a If the indoor real-time wind speed value V1Less than the target wind speed interval [ V ]min，Vmax]Minimum target wind speed V inminThe control terminal module calculates and feeds back signals to the air blower and the air supply regulating valve to increase the air supply quantity of the air blower and increase the opening angle of the air supply regulating valve, and simultaneously feeds back signals to the exhaust fan and the exhaust regulating valve to increase the exhaust quantity of the exhaust fan and increase the opening angle of the exhaust regulating valve until the indoor real-time air speed value V is reached1Reach the preset target windSpeed interval [ V ]min，Vmax]。
Step S2 further includes: the control terminal module compares the indoor real-time oxygen concentration value of the oxygen sensor with a preset indoor target oxygen concentration interval, controls the opening of the air supply air quantity regulating valve and the air exhaust air quantity regulating valve and the working state of the variable frequency controller according to the comparison result, and the specific process is as follows:
the method comprises the steps that an oxygen sensor sends indoor real-time oxygen concentration values to a control terminal module, when laboratory experimenters increase, oxygen in a laboratory is excessively consumed, or a large amount of waste gas is generated in an experimental process, so that the concentration of the oxygen in the laboratory is reduced, when the real-time oxygen concentration values monitored by the oxygen sensor are lower than the minimum oxygen concentration of an indoor target oxygen concentration range, the control terminal module calculates and feeds back signals to a blower and a blower adjusting valve, so that the air supply amount of the blower is increased, the opening angle of the blower adjusting valve is increased, the input of fresh air is increased, the control terminal module simultaneously feeds back signals to an exhaust fan and an exhaust adjusting valve, the exhaust amount of the exhaust fan is increased, the opening angle of the exhaust adjusting valve is increased, the exhaust of the indoor waste gas is accelerated, and the indoor oxygen concentration values reach the preset indoor target oxygen concentration range; and vice versa.
In addition, the exhaust fan is also used for discharging the waste gas reaching the standard to the atmosphere, when the exhaust fan is started, negative pressure is formed in an exhaust air pipe, the waste gas generated in a laboratory is sucked, adsorbed, filtered and sprayed for neutralization through activated carbon waste gas treatment equipment, and the waste gas reaching the standard is discharged to the atmosphere through the exhaust fan; the front end of the air inlet and the air outlet of the active carbon waste gas treatment equipment are provided with pressure sensors, and the control terminal module obtains real-time pressure values P in the air pipe before waste gas treatment in real time according to the pressure sensors2And the real-time pressure value P in the air duct after the waste gas treatment3Calculating the differential pressure Δ P ═ P2-P3) And comparing and feeding back according to the comparison result, specifically comprising:
when the differential pressure delta P before and after the waste gas treatment is too large and is larger than the preset target differential pressure delta P0At this time, the adsorption capacity of the adsorbent in the activated carbon exhaust gas treatment equipment tends to be saturated,the control terminal module calculates and feeds back signals, and gives an alarm to prompt the replacement of the adsorbent in the activated carbon waste gas treatment equipment; otherwise, the adsorbent in the activated carbon waste gas treatment equipment is not replaced;
the method comprises the steps that a waste gas treatment and spraying neutralization process is carried out inside the activated carbon waste gas treatment equipment, the activated carbon waste gas treatment equipment monitors the water level line of spraying circulating liquid in real time and sends the water level line to a control terminal module, when the actual water level line of the spraying circulating liquid is lower than the lowest water level line preset in the control terminal module, the control terminal module calculates and feeds back signals to the activated carbon waste gas treatment equipment, the activated carbon waste gas treatment equipment is controlled to carry out automatic liquid supplementing, and when the highest water level line is reached, liquid supplementing is automatically stopped;
the active carbon exhaust-gas treatment equipment still monitors the PH value that sprays the circulating fluid in real time to send for the control terminal module, when the real-time PH value that sprays the circulating fluid is not in the control terminal module when predetermineeing the target PH value interval, control terminal module feedback signal to active carbon exhaust-gas treatment equipment, in the control active carbon exhaust-gas treatment equipment is with waste liquid exhaust's waste liquid collection device, and the new circulating fluid that sprays of automatic replenishment. .
In the present invention, the total air supply volume of the laboratory is set to 70% of the total air discharge volume. The total air output per hour in the laboratory depends on the maximum of three:
1. the sum of the air discharge volume of the air discharge equipment is as follows:
Qrow board＝∑(νNoodle·SCutting block·t)
Wherein: qRow boardIs the total exhaust air volume (m) of the equipment3/h)，νNoodleThe minimum air suction surface speed (0.5m/s) of an operation opening of the exhaust fan; sCutting blockT is the cross-sectional area of the operation port of the exhaust fan and is 1 hour, namely 3600 s.
2. The amount of fresh air supplied to each person in the laboratory per hour is not less than 40m3；
3. The total number of air changes per hour in the laboratory is required to be between 6 and 15,
Qchangeable pipeΣ (V ventilation times)
Wherein: qChangeable pipeIs the amount of ventilation inm3V is laboratory volume in m3；
In addition, the air quantity calculation formula of the air pipe in unit hour is as follows:
Q＝ν·Scutting block·t
Wherein: v is the wind speed of the wind pipe, and the wind speed in a laboratory is preferably 6m/s-10 m/s; sCutting blockIs the cross-sectional area of the air duct; t is 1 hour, i.e. 3600 s;
when the total air supply quantity or the total air exhaust quantity changes, in order to ensure that the air speed of the air pipe is within a proper air speed interval, the opening angle of the air supply regulating valve or the air exhaust regulating valve needs to be adjusted, and the section area of the air pipe is controlled.
The invention can effectively keep the indoor pressure stable, flexibly adjust and control the indoor pressure, has fast adjustment speed and good effect, effectively ensures the physical and mental health of laboratory workers, discharges the waste gas reaching the standard to the atmosphere, effectively protects the environment and ensures that the living environment of human beings is not damaged.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (10)
1. The utility model provides a be used for laboratory exhaust-gas treatment equipment frequency conversion variable blast volume wind pressure balanced system which characterized in that: the device comprises a blower, an exhaust fan, a blowing air pipe, an exhaust pipe, a pressure sensor, an air quantity sensor, a variable frequency controller and a control terminal module;
the air feeder is communicated with the indoor spaces through air feeding pipes respectively, the exhaust fan is communicated with the indoor spaces through air exhaust pipes respectively, and air quantity sensors are arranged at the air feeder and the exhaust fan respectively and used for measuring air quantities at the air inlet and the air outlet respectively; pressure sensors are arranged in the plurality of indoor spaces and used for acquiring indoor real-time pressure values;
the control terminal module is connected with all pressure sensors and air volume sensors, is also connected with a variable frequency controller, is respectively connected with the air feeder and the exhaust fan, and is used for receiving indoor real-time pressure values transmitted by the pressure sensors and air speed values transmitted by the air volume sensors, controlling the air feeding air volume regulating valve and the air exhaust air volume regulating valve in real time and controlling the working states of the air feeder and the exhaust fan through the variable frequency controller.
2. The frequency-conversion variable air volume and air pressure balance system for the laboratory exhaust gas treatment equipment according to claim 1, characterized in that: an air supply volume regulating valve and an air exhaust volume regulating valve are also arranged; each blast pipe is provided with a blast air volume adjusting valve; each exhaust pipe is provided with an exhaust air volume regulating valve; the air supply air volume adjusting valve and the air exhaust air volume adjusting valve are both connected with the control terminal module and used for adjusting the valve opening under the control of the control terminal module.
3. The frequency-conversion variable air volume and air pressure balance system for the laboratory exhaust gas treatment equipment according to claim 1, characterized in that: the control terminal module comprises a PLC controller and an operable control panel, and can monitor and adjust the control parameters of the system in real time through the operable control panel.
4. The frequency-conversion variable air volume and air pressure balance system for the laboratory exhaust gas treatment equipment according to claim 1, characterized in that: and in the connection of the control terminal module and all the pressure sensors and the air volume sensors, the pressure sensors and the air volume sensors transmit signals in an R485 analog quantity communication mode.
5. The frequency-conversion variable air volume and air pressure balance system for the laboratory exhaust gas treatment equipment according to claim 1, characterized in that: the device is characterized by also comprising activated carbon waste gas treatment equipment, wherein the activated carbon waste gas treatment equipment is arranged at an air inlet of the exhaust fan and is used for treating waste gas generated in a laboratory and then exhausting the treated waste gas through the exhaust fan; the pressure sensors are arranged at the front end of the air inlet and the air outlet of the activated carbon waste gas treatment equipment, the activated carbon waste gas treatment equipment is connected with the control terminal module, the pressure sensors acquire pressure values before and after treatment of the activated carbon waste gas treatment equipment in real time, and the real-time pressure values are sent to the control terminal module in an R485 analog quantity communication mode.
6. The frequency-conversion variable air volume and air pressure balance system for the laboratory exhaust gas treatment equipment according to claim 1, characterized in that: the air conditioner further comprises an oxygen sensor, wherein the oxygen sensor is arranged at the air outlet and connected with the control terminal module, and is used for measuring the oxygen concentration in the indoor air and sending the measured oxygen concentration information to the control terminal module.
7. A frequency conversion and variable air volume wind pressure balance method for a laboratory waste gas treatment device is applied to the frequency conversion and variable air volume wind pressure balance system for the laboratory waste gas treatment device according to any one of claims 1 to 6, and is characterized by comprising the following steps:
s1, the pressure sensor and the air volume sensor acquire the pressure value and the air speed value of each indoor space in real time, and send the real-time pressure value and the air speed value to the control terminal module in an R485 analog quantity communication mode;
s2, the control terminal module compares the indoor real-time pressure value of the pressure sensor and the indoor real-time wind speed value of the wind sensor with a preset indoor target pressure interval and a preset target wind speed interval, and controls the opening of the air supply and air exhaust regulating valves and the working state of the variable frequency controller according to the comparison result;
and S3, the variable frequency controller receives the driving frequency change sent by the control terminal module, and further controls the rotating speed of the air blower and the exhaust fan.
8. The variable frequency and variable air volume wind pressure balancing method for the laboratory exhaust gas treatment device according to claim 7, wherein the specific process of the step S2 comprises:
pressure sensor direction control terminal moduleSending the indoor real-time pressure value, if the indoor real-time pressure value P1Greater than the indoor target pressure interval [ Pmin，Pmax]Maximum target pressure P ofmaxThen the control terminal module calculates and feeds back signals to the air supply air volume adjusting valve to reduce the opening angle of the air supply air volume adjusting valve, and simultaneously feeds back signals to the air exhaust air volume adjusting valve to increase the opening angle of the air exhaust air volume adjusting valve, so that the indoor real-time pressure value P is enabled1Reduced until the indoor real-time pressure value P1Reach the preset indoor target pressure interval [ Pmin，Pmax](ii) a If the indoor real-time pressure value P1Less than the indoor target pressure interval [ Pmin，Pmax]Minimum target pressure P ofminThen the control terminal module calculates and feeds back signals to the air supply air quantity regulating valve to increase the opening angle of the air supply air quantity regulating valve, and simultaneously feeds back signals to the air exhaust air quantity regulating valve to reduce the opening angle of the air exhaust air quantity regulating valve so as to enable the indoor real-time pressure value P to be1Increasing until the indoor real-time pressure value P1Reach the preset indoor target pressure interval [ Pmin，Pmax]；
The air quantity sensor sends an indoor real-time air speed value to the control terminal module, and if the indoor real-time air speed value is V1Greater than the target wind speed interval [ Vmin，Vmax]Maximum target wind speed VmaxThe control terminal module calculates and feeds back signals to the air blower and the air supply regulating valve to reduce the air supply quantity of the air blower and the opening angle of the air supply regulating valve, and simultaneously feeds back signals to the exhaust fan and the exhaust regulating valve to reduce the exhaust quantity of the exhaust fan and reduce the opening angle of the exhaust regulating valve until the indoor real-time air speed value V is reached1Reaches a preset target wind speed interval Vmin，Vmax](ii) a If the indoor real-time wind speed value V1Less than the target wind speed interval [ V ]min，Vmax]Minimum target wind speed V inminThe control terminal module calculates and feeds back signals to the blower and the air supply regulating valve to increase the air supply quantity of the blower and increase the opening angle of the air supply regulating valve, and simultaneously feeds back signals to the exhaust fanAnd an exhaust regulating valve for increasing the exhaust volume of the exhaust fan and increasing the opening angle of the exhaust regulating valve until the indoor real-time wind speed value V1Reaches a preset target wind speed interval Vmin，Vmax]。
9. The method of claim 7, wherein the step S2 further comprises: the control terminal module compares the indoor real-time oxygen concentration value of the oxygen sensor with a preset indoor target oxygen concentration interval, controls the opening of the air supply air quantity regulating valve and the air exhaust air quantity regulating valve and the working state of the variable frequency controller according to the comparison result, and the specific process is as follows:
the method comprises the steps that an oxygen sensor sends indoor real-time oxygen concentration values to a control terminal module, when laboratory experimenters increase, oxygen in a laboratory is excessively consumed, or a large amount of waste gas is generated in an experimental process, so that the concentration of the oxygen in the laboratory is reduced, when the real-time oxygen concentration values monitored by the oxygen sensor are lower than the minimum oxygen concentration of an indoor target oxygen concentration range, the control terminal module calculates and feeds back signals to a blower and a blower adjusting valve, so that the air supply amount of the blower is increased, the opening angle of the blower adjusting valve is increased, the input of fresh air is increased, the control terminal module simultaneously feeds back signals to an exhaust fan and an exhaust adjusting valve, the exhaust amount of the exhaust fan is increased, the opening angle of the exhaust adjusting valve is increased, the exhaust of the indoor waste gas is accelerated, and the indoor oxygen concentration values reach the preset indoor target oxygen concentration range; and vice versa.
10. The frequency-conversion variable air volume and air pressure balancing method for the laboratory exhaust gas treatment equipment according to claim 7, characterized in that: the exhaust fan is also used for discharging the waste gas reaching the standard to the atmosphere, when the exhaust fan is started, negative pressure is formed in an exhaust air pipe, the waste gas generated in a laboratory is sucked, adsorbed, filtered and sprayed for neutralization through activated carbon waste gas treatment equipment, and the waste gas reaching the standard is discharged to the atmosphere through the exhaust fan; the front end of the air inlet and the air outlet of the active carbon waste gas treatment equipment are provided withThe control terminal module obtains a real-time pressure value P in the air duct before waste gas treatment according to the pressure sensor in real time2And the real-time pressure value P in the air duct after the waste gas treatment3Calculating the differential pressure Δ P ═ P2-P3) And comparing and feeding back according to the comparison result, specifically comprising:
when the differential pressure delta P before and after the waste gas treatment is too large and is larger than the preset target differential pressure delta P0When the adsorption capacity of the adsorbent in the activated carbon waste gas treatment equipment tends to saturation, the control terminal module calculates and feeds back signals, and gives an alarm to prompt the replacement of the adsorbent in the activated carbon waste gas treatment equipment; otherwise, the adsorbent in the activated carbon waste gas treatment equipment is not replaced;
the method comprises the steps that a waste gas treatment and spraying neutralization process is carried out inside the activated carbon waste gas treatment equipment, the activated carbon waste gas treatment equipment monitors the water level line of spraying circulating liquid in real time and sends the water level line to a control terminal module, when the actual water level line of the spraying circulating liquid is lower than the lowest water level line preset in the control terminal module, the control terminal module calculates and feeds back signals to the activated carbon waste gas treatment equipment, the activated carbon waste gas treatment equipment is controlled to carry out automatic liquid supplementing, and when the highest water level line is reached, liquid supplementing is automatically stopped;
the active carbon exhaust-gas treatment equipment still monitors the PH value that sprays the circulating fluid in real time to send for the control terminal module, when the real-time PH value that sprays the circulating fluid is not in the control terminal module when predetermineeing the target PH value interval, control terminal module feedback signal to active carbon exhaust-gas treatment equipment, in the control active carbon exhaust-gas treatment equipment is with waste liquid exhaust's waste liquid collection device, and the new circulating fluid that sprays of automatic replenishment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110574745.9A CN113357727A (en) | 2021-05-25 | 2021-05-25 | Variable-frequency variable-air-volume air pressure balance system and method for laboratory waste gas treatment equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110574745.9A CN113357727A (en) | 2021-05-25 | 2021-05-25 | Variable-frequency variable-air-volume air pressure balance system and method for laboratory waste gas treatment equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113357727A true CN113357727A (en) | 2021-09-07 |
Family
ID=77527731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110574745.9A Pending CN113357727A (en) | 2021-05-25 | 2021-05-25 | Variable-frequency variable-air-volume air pressure balance system and method for laboratory waste gas treatment equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113357727A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113932350A (en) * | 2021-11-03 | 2022-01-14 | 海鹰企业集团有限责任公司 | Novel mobile negative pressure shelter independently exhaust unit and system |
| CN114063579A (en) * | 2021-11-01 | 2022-02-18 | 青岛天人环境股份有限公司 | Industrial internet deodorization edge synergy micro-platform equipment |
| CN114166018A (en) * | 2021-11-11 | 2022-03-11 | 东莞市众大机械实业有限公司 | Prevent new forms of energy material reaction unit of exhaust gas leakage |
| CN114264051A (en) * | 2021-12-22 | 2022-04-01 | 珠海格力电器股份有限公司 | Airflow stability control system, method and storage medium |
| CN114291245A (en) * | 2022-01-05 | 2022-04-08 | 江南造船(集团)有限责任公司 | Marine health department exhaust system |
| CN115823716A (en) * | 2022-11-25 | 2023-03-21 | 珠海格力电器股份有限公司 | Indoor static pressure adjusting method and device, electronic equipment and storage medium |
| CN116360515A (en) * | 2023-04-04 | 2023-06-30 | 中建三局集团有限公司 | Differential pressure control method for biosafety laboratory |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101574682B1 (en) * | 2015-03-23 | 2015-12-11 | 주식회사씨애치씨랩 | Fume hood system for laboratory with indoor suction and exhaust |
| CN205897439U (en) * | 2016-08-01 | 2017-01-18 | 广州博瑞实验设备有限公司 | Laboratory inverter type ventilation control system |
| CN108019855A (en) * | 2017-11-15 | 2018-05-11 | 同济大学 | Full decoupling formula air cleaning and conditioning system |
| CN108421398A (en) * | 2018-05-31 | 2018-08-21 | 苏州爱源环境科技有限公司 | A kind of laboratory exhaust gas processing system |
| CN112556061A (en) * | 2021-01-07 | 2021-03-26 | 深圳博强建设开发有限公司 | Ventilation system and method |
| CN112797569A (en) * | 2020-12-31 | 2021-05-14 | 中天道成（苏州）洁净技术有限公司 | Multi-environment independent control method and system for ultrahigh precision laboratory |
-
2021
- 2021-05-25 CN CN202110574745.9A patent/CN113357727A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101574682B1 (en) * | 2015-03-23 | 2015-12-11 | 주식회사씨애치씨랩 | Fume hood system for laboratory with indoor suction and exhaust |
| CN205897439U (en) * | 2016-08-01 | 2017-01-18 | 广州博瑞实验设备有限公司 | Laboratory inverter type ventilation control system |
| CN108019855A (en) * | 2017-11-15 | 2018-05-11 | 同济大学 | Full decoupling formula air cleaning and conditioning system |
| CN108421398A (en) * | 2018-05-31 | 2018-08-21 | 苏州爱源环境科技有限公司 | A kind of laboratory exhaust gas processing system |
| CN112797569A (en) * | 2020-12-31 | 2021-05-14 | 中天道成（苏州）洁净技术有限公司 | Multi-environment independent control method and system for ultrahigh precision laboratory |
| CN112556061A (en) * | 2021-01-07 | 2021-03-26 | 深圳博强建设开发有限公司 | Ventilation system and method |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114063579A (en) * | 2021-11-01 | 2022-02-18 | 青岛天人环境股份有限公司 | Industrial internet deodorization edge synergy micro-platform equipment |
| CN113932350A (en) * | 2021-11-03 | 2022-01-14 | 海鹰企业集团有限责任公司 | Novel mobile negative pressure shelter independently exhaust unit and system |
| CN114166018A (en) * | 2021-11-11 | 2022-03-11 | 东莞市众大机械实业有限公司 | Prevent new forms of energy material reaction unit of exhaust gas leakage |
| CN114264051A (en) * | 2021-12-22 | 2022-04-01 | 珠海格力电器股份有限公司 | Airflow stability control system, method and storage medium |
| CN114291245A (en) * | 2022-01-05 | 2022-04-08 | 江南造船(集团)有限责任公司 | Marine health department exhaust system |
| CN115823716A (en) * | 2022-11-25 | 2023-03-21 | 珠海格力电器股份有限公司 | Indoor static pressure adjusting method and device, electronic equipment and storage medium |
| CN116360515A (en) * | 2023-04-04 | 2023-06-30 | 中建三局集团有限公司 | Differential pressure control method for biosafety laboratory |
| CN116360515B (en) * | 2023-04-04 | 2023-10-27 | 中建三局集团有限公司 | Differential pressure control method for biosafety laboratory |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113357727A (en) | Variable-frequency variable-air-volume air pressure balance system and method for laboratory waste gas treatment equipment | |
| CN207350692U (en) | Based on the intelligent ventilating system in scientific experiment room | |
| CN105213139B (en) | A kind of oxygen cabin of computer manipulation | |
| CN207094941U (en) | Fresh air ventilator | |
| CN108507134A (en) | New wind intelligent control system | |
| CN208513317U (en) | A kind of Novel variable-frequency vent cabinet | |
| CN206755342U (en) | A kind of intelligent fresh air apparatus and system | |
| CN113465073A (en) | Control method of ventilation system and ventilation system | |
| CN110801563A (en) | Respirator and automatic calibration method for oxygen sensor of respirator | |
| CN108225003B (en) | Energy-saving hot air drying system and energy-saving hot air drying method | |
| CN107687694B (en) | Ventilator with purifying, dehumidifying and indoor pressure regulating functions | |
| CN206846961U (en) | Laboratory saves air supplying and exhausting system | |
| CN207945780U (en) | A kind of intelligent circulation dispatch wind system | |
| CN206145904U (en) | Wind -controlled system is arranged to energy -saving variable new trend in toilet | |
| CN116126060A (en) | Adjusting device and adjusting method for environment of synthetic biology laboratory | |
| CN115264751A (en) | Negative pressure control method and device for indoor cleanliness and negative pressure laboratory | |
| CN211333823U (en) | Improved cement-based material curing chamber | |
| CN211177301U (en) | Surplus wind volume differential pressure cascade controller | |
| CN208419024U (en) | A kind of multiple indoor air cleaning system | |
| CN211041175U (en) | Air conditioner | |
| CN113357730A (en) | Intelligent pressure balancing system and pressure balancing method for biosafety laboratory | |
| CN204073003U (en) | A kind of Pneumatic electrical control aerating system | |
| CN214275966U (en) | Air conditioner constant humidity system | |
| CN219531135U (en) | Device for controlling particle quantity in clean area | |
| CN215765506U (en) | Air treatment system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210907 |
|
| RJ01 | Rejection of invention patent application after publication |