CIT pressure-adjustable purification ventilation system

Abstract

The invention discloses a CIT pressure-adjustable purification ventilation system, which comprises an air supply device, an air exhaust device, a central controller and a distributed sensing network, and is characterized in that the distributed sensing network consists of at least one micro differential pressure sensor deployed in a spatial hexahedron, and each sensor is connected to the central controller through a bus; and the multi-parameter fusion control module is integrated in the central controller, the input end is connected with the distributed sensing network and the environment sensor group, and the output end is connected with the air supply device and the air exhaust device. The negative pressure gradient caused by sinking pollutants is captured through the ground sensor set, an air supply outlet vortex grating is triggered to increase the declination angle, sensor signals of an area needing to be focused are amplified through the weight distributor, the area is preferentially compensated by the controller, airflow is forced to flow close to the wall through the flow guide fin interval gradient design, and the control precision is improved. Corner eddy current is eliminated, an emergency mechanism double-signal parallel triggering mechanism avoids delay caused by false alarm of a single sensor, the voltage of the electrostatic module is increased through the pollutant monitor, and the particulate matter trapping efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ventilation systems, in particular to a CIT adjustable pressure purification ventilation system. BACKGROUND

[0002] Many critical industries (such as pharmaceutical, biotechnology, microelectronics, medical devices, precision manufacturing, high-level biosafety laboratories, hospital operating rooms / isolation rooms) require strict control of the concentration of airborne particles (dust, microorganisms, etc.) in the environment to ensure product quality, process stability, experimental reliability or personnel safety. Such environments are called clean rooms or controlled environments, and simply controlling particle concentration is not enough. In these environments, it is crucial to maintain a specific room pressure (positive or negative pressure): positive pressure prevents external contaminated air (particles, microorganisms) from entering the clean area. For example: sterile filling room, core production area, electronic clean room, negative pressure: prevent internal potentially harmful substances (pathogens, toxic chemicals, dust) from leaking into the external environment or adjacent areas. For example: biosafety laboratory, isolation room, hazardous material handling area, different process steps, different operating states (running, self-cleaning, disinfection, maintenance), and even the use state changes of adjacent rooms may require the pressure set point of a specific room to be dynamically adjusted. A room may require positive pressure at certain times and negative pressure at other times, or different levels of positive / negative pressure.

[0003] However, the prior art still has great deficiencies, such as: The CIT ventilation system in the prior art often has single-point pressure detection, which leads to distortion of the space pressure field control, especially in high-risk biochemistry areas, air flow dead angles are easily formed, and the pure feedback control mode has a lag response to sudden disturbances, and the pressure recovery time far exceeds the safety standard allowable threshold. SUMMARY

[0004] The purpose of the present application is to provide a CIT adjustable pressure purification ventilation system to solve the problems raised in the background art.

[0005] To achieve the above purpose, the present application provides the following technical solutions: The CIT adjustable pressure purification ventilation system comprises a supply air device, an exhaust device and a central controller, and further comprises: A distributed sensing network composed of at least one micro-pressure difference sensor deployed in a space hexahedron, each sensor being connected to the central controller through a bus; A multi-parameter fusion control module integrated in the central controller, with an input end connected to the distributed sensing network and an environment sensor group, and an output end connected to the supply air device and the exhaust device; A vortex-induced grid installed at the supply air outlet and the exhaust air outlet, with the rotation axis of the fan-shaped valve plate connected to a stepper motor, and the stepper motor being controlled by the central controller.

[0006] Preferably, the air supply device comprises, in sequence along the airflow direction, a primary filter, a medium filter, a high-efficiency filter and an electrostatic enhancement module, and the high-voltage power input end of the electrostatic enhancement module is connected to the pollutant concentration detector.

[0007] Preferably, the central controller comprises: a temperature and humidity compensation unit, a first input end of which is connected to a dew point sensor, a second input end of which is connected to an air supply amount setter, and an output end of which is connected to an air blower frequency converter; a dynamic air valve adjustment unit, an input end of which is connected to an air duct Reynolds number detector, and an output end of which is connected to an exhaust air valve driver.

[0008] Preferably, the central controller further integrates: a pressure prediction module, an input end of which is connected to a door and window state detector and a device power collector, and the pressure prediction module generates a blower pre-adjustment signal.

[0009] Preferably, the system further comprises an emergency linkage mechanism, which comprises a VOC mutation detection circuit and a pressure drop identification circuit connected in parallel, and the output end of the emergency linkage mechanism simultaneously triggers an air supply valve limiter, an exhaust air blower full-speed starting circuit and an ultraviolet sterilizer.

[0010] Preferably, the distributed sensing network comprises one wall sensor, one ground sensor and one ceiling sensor. a weight distributor, which distributes priority coefficients according to sensor positions and regional functional attributes.

[0011] Preferably, the dynamic air valve adjustment unit comprises: a turbulent flow state identification sub-module, which divides laminar and turbulent flow conditions based on Reynolds number; a non-linear compensation sub-module, which increases air valve opening degree compensation amount in the turbulent flow condition.

[0012] Preferably, the surface of the sector valve plate of the vortex induction grid is provided with flow guide fins, and the interval of the flow guide fins decreases along the airflow direction.

[0013] Compared with the prior art, the present application has the advantages of 1. The ground sensor group captures the negative pressure gradient caused by the sinking pollutants, triggers the air supply port vortex grid to increase the downward angle, the system amplifies the sensor signal of the area that needs to be focused on through the weight distributor, so that the controller preferentially compensates for the area, and the interval gradient design of the flow guide fins forces the airflow to flow along the wall, eliminating the wall corner vortex. 2. The system detects the door opening signal through the door and window state detector, the pressure prediction module outputs the fan speed-up instruction in advance, the air valve adjusting unit starts the nonlinear compensation in the turbulent state chamber, the air valve opening is improved, the emergency mechanism double signal parallel trigger mechanism is triggered, and the delay caused by false report of a single sensor is avoided; 3. The system realizes the temperature and humidity compensation unit to automatically reduce the air supply through the data of the dew point sensor, reduces the cold loss, and improves the voltage of the electrostatic module through the pollutant monitor to improve the particulate matter capture efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The system linkage workflow diagram of the present application; Figure 2 The air supply device system diagram of the present application; Figure 3 The distributed sensor network system diagram of the present application; Figure 4 The air valve dynamic adjusting unit system diagram of the present application; Figure 5 The emergency linkage mechanism system diagram of the present application.

[0015] In the figure: 1, air supply device; 101, primary filter; 102, medium efficiency filter; 103, high efficiency filter; 104, electrostatic enhancement module; 2, exhaust device; 3, central controller; 301, temperature and humidity compensation unit; 302, air valve dynamic adjusting unit; 3021, turbulent state identification sub-module; 3022, nonlinear compensation sub-module; 303, pressure prediction module; 4, distributed sensor network; 401, wall sensor; 402, ground sensor; 403, ceiling sensor; 5, multi-parameter fusion control module; 6, environmental sensor group; 7, vortex induced grid; 8, stepper motor; 9, pollutant concentration detector; 10, dew point sensor; 11, air supply amount setter; 12, fan frequency converter; 13, Reynolds number detector; 14, exhaust valve driver; 15, door and window state detector; 16, equipment power collector; 17, emergency linkage mechanism; 171, VOC mutation detection circuit; 172, pressure drop identification circuit; 18, air supply valve limiter; 19, exhaust fan full-speed starting circuit; 20, ultraviolet sterilizer. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0017] Please refer toFigures 1-5 The application provides a technical solution: The CIT adjustable pressure purification ventilation system comprises a supply air device 1, an exhaust air device 2 and a central controller 3, and further comprises: A distributed sensing network 4 is composed of at least nine micro differential pressure sensors arranged in a space hexahedron, each sensor is connected to the central controller 3 through a bus, and the distributed sensing network 4 comprises four wall surface sensors 401, four ground surface sensors 402 and one ceiling sensor 403. The micro differential pressure sensor adopts Sensirion SDP810-500Pa and is arranged in a space hexahedron: four wall surface sensors 401, 1.2 m away from the ground, four ground surface sensors 402 located in the corner area, and one ceiling sensor 403 installed in the middle, which can collect pressure data of nine key points in the space in real time and transmit the data to the central controller 3, thereby solving the problem of airflow distribution distortion caused by single-point detection.

[0018] A multi-parameter fusion control module 5 is integrated in the central controller 3, the input end of the multi-parameter fusion control module 5 is connected to the distributed sensing network 4 and an environmental sensor group 6, and the output end of the multi-parameter fusion control module 5 is connected to the supply air device 1 and the exhaust air device 2. The multi-parameter fusion control module 5 is a TI TMS320F28379D dual-core DSP chip integrated in the central controller 3, the input signal source of the multi-parameter fusion control module 5 is nine-way pressure data of the distributed sensing network 4, and the environmental sensor group 6 comprises a temperature and humidity sensor, a PM2.5 sensor and a VOC sensor; the multi-parameter fusion control module 5 fuses multi-source data such as pressure, temperature and humidity and pollutant concentration, outputs a cooperative control instruction of the supply air device and the exhaust air device, and realizes dynamic decoupling of environmental parameters and pressure control.

[0019] A vortex-induced grille 7 is installed at the supply air outlet and the exhaust air outlet, the rotating shaft of a fan-shaped valve plate of the vortex-induced grille 7 is connected to a stepping motor 8, the stepping motor 8 is controlled by the central controller 3, the vortex-induced grille 7 is made of stainless steel, flow guide fins are arranged on the surface of the vortex-induced grille 7, the interval of the flow guide fins gradually decreases from 5 mm at the air inlet end to 1 mm at the air outlet end, the angle (0-70°) of the valve plate is adjusted by the central controller 3, the forced airflow forms a spiral diffusion flow field, and the vortex dead angle at the wall corner is eliminated.

[0020] The supply air device 1 comprises, in sequence along the airflow direction, a primary filter 101, a medium filter 102, a high-efficiency filter 103 and an electrostatic enhancement module 104, and the high-voltage power supply input end of the electrostatic enhancement module 104 is connected to a pollutant concentration detector 9.

[0021] The primary filter 101 is a G4 grade non-woven fabric filter screen, the medium efficiency filter is a F7 grade bag filter, the high efficiency filter 103 is a H13 grade glass fiber filter paper, the electrostatic enhancement module 104 is a Corona-Tech CX-24, the input voltage is adjustable from 0 to 12 kV, the pollutant concentration detector 9 (model Alphasense OPC-R1) monitors PM2.5 / VOC in real time, the dynamic electrostatic module voltage is raised, and the submicron particle capture capacity is enhanced The central controller 3 comprises: The temperature and humidity compensation unit 301 has a first input end connected to the dew point sensor 10, a second input end connected to the supply air volume setter 11, and an output end connected to the supply fan frequency converter 12. The air valve dynamic adjustment unit 302 has an input end connected to the air duct Reynolds number detector 13 and an output end connected to the exhaust air valve driver 14.

[0022] The temperature and humidity compensation unit 301 comprises: Input: dew point sensor 10→ supply air volume setter 11 (potentiometer encoder), output: supply fan frequency converter 12, based on dew point temperature dynamic compensation of supply air volume, to prevent condensation (such as T_dp>15℃ automatically reduce air volume 10%) The air valve dynamic adjustment unit 302 has an input end connected to the air duct Reynolds number detector 13 and an output end connected to the exhaust air valve driver 14, the turbulent flow state recognition sub-module 3021 switches the working condition according to the Re number, and the non-linear compensation sub-module 3022 increases the opening degree compensation amount by 15% in the turbulent flow state (Re>4000) The pressure prediction module 303 has an input end connected to the door and window state detector 15 and the device power collector 16, and predicts pressure fluctuations based on the LSTM algorithm, such as detecting that the door and window are opened, and the fan speed is raised by 0.5s in advance.

[0023] The pressure prediction module 303 has an input end connected to the door and window state detector 15 and the device power collector 16, and the pressure prediction module 303 generates a fan pre-adjustment signal.

[0024] It also includes an emergency linkage mechanism 17, which includes a VOC mutation detection circuit 171 and a pressure drop identification circuit 172 connected in parallel, and the output end of the emergency linkage mechanism 17 simultaneously triggers the supply air valve limiter 18, the exhaust fan full-speed starting circuit 19 and the ultraviolet sterilizer 20.

[0025] Hardware composition: VOC mutation detection circuit 171: PID sensor plus differential amplifier (threshold>50ppm / ms), pressure drop identification circuit 172: differential pressure comparator.

[0026] Linkage output: touch to send the air valve limiter 18 (mechanical limit block forced opening is less than or equal to 20%) → activate the exhaust fan full speed start circuit 19 (relay normally open contact) → start the ultraviolet sterilizer (20).

[0027] The weight distributor 404 assigns priority coefficients according to the sensor position and the area function attribute, and the weight distributor 404 is based on the adjustable resistance matrix of the analog switch array, and the function logic is that the biosafety cabinet area sensor weight coefficient is set to 0.8, and the general area is 0.4, so that the high-risk area signal is preferentially responded.

[0028] The air valve dynamic adjustment unit 302 includes a turbulent flow state identification submodule 3021 for dividing laminar flow and turbulent flow conditions based on a Reynolds number; and a nonlinear compensation submodule 3022 for increasing an air valve opening compensation amount in a turbulent flow condition, wherein the surface of the fan-shaped valve plate of the vortex induction grid 7 is provided with flow guide fins, and the distance between the flow guide fins decreases in a gradient along the airflow direction.

[0029] Working principle: After the CIT adjustable pressure purification ventilation system is started, the distributed sensor network 4 immediately starts to work, and the nine micro-pressure difference sensors (including four wall sensors 401, four ground sensors 402, and one ceiling sensor 403) arranged in the space hexahedron continuously collect real-time pressure data of each area of the space, and all the sensors transmit the pressure signals to the central controller 3 through the RS485 bus.

[0030] The weight distributor 404 performs priority weighting processing on the sensor signals according to the preset area function attribute (such as the biosafety area weight coefficient 0.8 and the general area 0.4), and forms a space comprehensive pressure value. At the same time, the Sensirion SHT45 temperature and humidity sensor, the Plantower PMS5003 particulate matter sensor, and the AMS CCS811 VOC sensor in the environmental sensor group 6 synchronously collect environmental parameters, and these data and the weighted pressure value are jointly input into the multi-parameter fusion control module 5 for data fusion analysis.

[0031] The multi-parameter fusion control module 5 is integrated in the TI TMS320F28379D chip of the central controller 3, and generates a control decision through cross verification of multiple source information: when it is detected that the space comprehensive pressure is lower than the set threshold value, a pressurization instruction is sent to the air supply device 1; and when the pressure is higher than the threshold value, a pressure relief instruction is sent to the exhaust device 2. After receiving the instruction, the air supply device 1 starts a three-stage filtration process: air first passes through the G4 grade primary filter 101 to intercept large particles, then passes through the F7 grade medium efficiency filter 102 to remove medium particle pollutants, and finally passes through the H13 grade high efficiency filter 103 to capture 99.97% of 0.3 μm particles.

[0032] The pollutant concentration detector 9 (Alphasense OPC-R1 type) monitors the PM2.5 and VOC concentrations of the filtered air in real time. If the PM2.5 concentration is greater than 75 μg / m³ or the VOC concentration is greater than 1 ppm, the working voltage of the electrostatic enhancement module 104 (Corona-Tech CX-24 type) is immediately increased to the range of 8-12 kV to enhance the electric field force to adsorb the remaining submicron particles, and the overall purification efficiency is increased to 99.99% @ 0.1 μm. The temperature and humidity compensation unit 301 of the central controller 3 obtains the current dew point temperature through the dew point sensor 10 (E+E EE06 type), and dynamically adjusts the output frequency of the air supply fan frequency converter 12 (ABB ACS550-01 type) by combining the preset value of the air supply amount setter 11: when the dew point temperature exceeds 15°C, the air supply amount is automatically reduced by 10% to prevent condensation; when the dew point is lower than 10°C, the air supply amount is increased by 8% to maintain humidity balance.

[0033] The air valve dynamic adjustment unit 302 obtains the airflow Reynolds number in the air duct through the air duct Reynolds number detector 13 (Siemens 7ME6820 type). The turbulent flow state recognition sub-module 3021 determines that it is a turbulent flow condition when Re>4000, and triggers the nonlinear compensation sub-module 3022 to output a compensation instruction to increase the opening of the exhaust valve driver 14 (Belimo LF24-SR type) by 15%, solving the nonlinear control deviation under high air volume. The pressure prediction module 303 monitors the opening and closing state of the door and window through the door and window state detector 15 (Honeywell 9450 magnetic reed switch), and obtains the start and stop power data of the experimental equipment through the equipment power collector 16 (Schneider PM5560 type). Based on the built-in LSTM algorithm, the future 30-second pressure fluctuation trend is predicted: when the door and window opening signal is detected, the speed-up instruction is sent to the air supply fan frequency converter 12 0.5 seconds in advance; when the equipment power drops by more than 30%, the exhaust valve opening is reduced in advance to offset the negative pressure impact.

[0034] The NEMA 17 stepper motor 8 of the vortex-induced grid 7 drives the fan-shaped valve plate to rotate according to the instructions of the central controller 3. The surface of the valve plate is equipped with guide fins with a gradually decreasing distance from 5mm to 1mm along the airflow direction, which forces the airflow to form a spiral diffusion angle of 20°-65°, effectively eliminating the wall corner vortex dead angle. When an abnormality occurs during system operation, the VOC mutation detection circuit 171 (Alphasense VOC-B4 sensor + differential amplifier) of the emergency linkage mechanism 17 monitors the VOC concentration change rate > 50ppm / ms, or the pressure drop identification circuit 172 (TI LM393 differential pressure comparator) detects that the pressure drop rate > 5Pa / s, which immediately triggers a three-stage linkage response: first, the air supply valve stopper 18 activates the mechanical stop block to force the air supply valve opening to be ≤20%, while the exhaust fan full-speed start circuit 19 closes the relay contact to make the exhaust fan reach 100% power instantaneously, and the ultraviolet sterilizer 20 (Philips TUV 36W type) is started simultaneously for air sterilization.

[0035] Throughout the process, the multi-parameter fusion control module 5 continuously optimizes the control parameters. For example, during the high-temperature period in summer, the temperature and humidity compensation unit 301 automatically reduces the air supply according to the dew point rise value, and the air valve dynamic adjustment unit 302 correspondingly reduces the exhaust valve opening to maintain pressure balance; when the pollutant concentration detector 9 finds that PM2.5 continuously exceeds the standard, the electrostatic enhancement module 104 enters the high-voltage mode and links the pressure prediction module 303 to increase the air supply by 10% to accelerate the removal of pollutants. When the system is turned off, the weight distributor 404 saves the pressure data characteristics of each area for initial parameter optimization at the next start, and the central controller 3 generates a running log to record key events such as the number of times the emergency linkage mechanism 17 is triggered and the frequency of angle adjustment of the vortex-induced grid 7, providing data support for maintenance. The entire workflow realizes the technical effects of pressure control accuracy ±0.5Pa, disturbance response time <15 seconds, and comprehensive energy consumption reduction by 35% through the spatial pressure field reconstruction of the distributed sensing network 4, the environmental adaptive decision of the multi-parameter fusion control module 5, the airflow organization optimization of the vortex-induced grid 7, and the multi-stage protection mechanism of the emergency linkage mechanism 17.

[0036] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A CIT pressure-adjustable purification ventilation system comprising an air supply device (1), an air exhaust device (2) and a central controller (3), characterized in that: Also includes: A distributed sensing network (4) consisting of at least nine differential pressure sensors arranged in a hexahedron in space, each sensor being connected to a central controller (3) via a bus; A multi-parameter fusion control module (5) is integrated into the central controller (3), the input end of which is connected to the distributed sensor network (4) and the environmental sensor group (6), and the output end of which is connected to the air supply device (1) and the exhaust device (2); The vortex induction grille (7) is installed at the air supply port and the air exhaust port, and the rotating shaft of the fan-shaped valve plate is connected to the stepping motor (8), and the stepping motor (8) is controlled by the central controller (3).

2. The CIT pressure-adjustable purification ventilation system according to claim 1, characterized in that: The air supply device (1) comprises, in sequence along the airflow direction, a primary filter (101), a medium filter (102), a high efficiency filter (103), and an electrostatic enhancement module (104); a high-voltage power supply input end of the electrostatic enhancement module (104) is connected to a pollutant concentration detector (9).

3. The CIT pressure-adjustable purification ventilation system according to claim 2, characterized in that: The central controller (3) comprises: A temperature and humidity compensation unit (301), wherein a first input end is connected to a dew point sensor (10), a second input end is connected to an air supply volume setter (11), and an output end is connected to a blower frequency converter (12); The air valve dynamic adjustment unit (302) has an input end connected to the air duct Reynolds number detector (13) and an output end connected to the exhaust valve driver (14).

4. The CIT pressure-adjustable purification ventilation system according to claim 3, characterized in that: The central controller (3) also integrates: The pressure prediction module (303) has an input end connected to a door and window status detector (15) and an equipment power collector (16), and the pressure prediction module (303) generates a fan pre-regulation signal.

5. The CIT pressure-adjustable purification ventilation system according to claim 1, characterized in that: The device further comprises an emergency linkage mechanism (17), comprising a VOC mutation detection circuit (171) and a pressure drop recognition circuit (172) connected in parallel, wherein the output end of the emergency linkage mechanism (17) simultaneously triggers an air supply valve limiter (18), an exhaust fan full-speed start circuit (19), and an ultraviolet disinfector (20).

6. The CIT pressure-adjustable purification ventilation system according to claim 1, characterized in that: The distributed sensing network (4) includes four wall sensors (401), four ground sensors (402) and one ceiling sensor (403); The weight allocator (404) allocates priority coefficients according to sensor locations and regional functional attributes.

7. The CIT pressure-adjustable purification ventilation system according to claim 3, characterized in that: The air valve dynamic adjustment unit (302) includes: Turbulence state identification submodule (3021), which divides laminar and turbulent flow conditions based on Reynolds number; The nonlinear compensation submodule (3022) increases the air valve opening compensation amount under turbulent conditions.

8. The CIT pressure-adjustable purification ventilation system according to claim 1, characterized in that: The surface of the fan-shaped valve plate of the vortex inducing grid (7) is provided with guide fins, and the spacing between the guide fins decreases gradually along the airflow direction.

Images