Intelligent consumption-reducing laboratory ventilation system

Abstract

The invention discloses an intelligent consumption-reducing laboratory ventilation system which comprises an air supply mechanism, a heating assembly used for heating supplied air, an air supply assembly used for supplying air and an air exhaust assembly. Comprising an air exhaust fan, an air exhaust pipeline communicated with an outlet of the air exhaust fan, a filter communicated with an inlet of the air exhaust pipeline, an air exhaust main pipe communicated with an inlet of the filter, an air exhaust fan cover installed above a laboratory operation table, and an air exhaust communication pipe communicated with the air exhaust main pipe. Accurate intelligent regulation and control can be achieved through the control assembly, the PLC receives data from the flow monitoring unit, the pipeline static pressure monitoring unit, the pressure difference monitoring unit and the environment monitoring unit, all parts are controlled to operate after analysis, the rotating speed of the exhaust fan, the rotating speed of the exhaust fan and the rotating speed of the air supply fan are adjusted through the frequency converter, and the working efficiency is improved. Proper air volume is provided according to actual requirements of a laboratory, and energy waste caused by excessive ventilation is avoided, so that the use energy consumption is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of laboratory ventilation systems, and particularly to an intelligent energy-saving laboratory ventilation system. Background Technique

[0002] The laboratory ventilation system is a core component of laboratory infrastructure. It aims to ensure the safety of experimental personnel, maintain the stability of the experimental environment, and prevent the spread of pollutants through scientific air flow control means. It mainly consists of exhaust fans, supply fans, air ducts, etc., and is widely used in various types of laboratories, such as scientific research laboratories, educational laboratories, biological laboratories, pharmaceutical laboratories, etc.

[0003] Ventilation refers to directly discharging or discharging the indoor polluted air outdoors after purification, and at the same time supplementing fresh air to maintain the indoor air conditions and meet the hygiene standards and production process requirements. Among them, discharging the polluted air is called exhaust, and supplementing fresh air is called supply. According to different power sources, the ventilation system can be divided into natural ventilation and mechanical ventilation. Mechanical ventilation can be further divided into general ventilation and local ventilation. General ventilation is to ventilate and exchange air in the entire room, while local ventilation controls the ventilation range at the location where harmful substances are concentrated or in the local area where people are active, such as fume hoods, universal exhaust hoods, atomic absorption hoods, etc. A good ventilation system can provide a comfortable and safe working environment for experimental personnel. The room control system can monitor the temperature, humidity, room pressure difference, exhaust and supply air of the laboratory, thereby improving the enthusiasm and work efficiency of experimental personnel.

[0004] However, there are still some deficiencies in the operation of the existing laboratory ventilation systems. For example, the exhaust and supply air in the ventilation system are mostly in a fixed quantity mode, resulting in ineffective energy consumption. Moreover, the adjustment of the air volume mainly relies on manual operation and cannot respond to environmental changes in real time, thereby reducing the use effect of the laboratory ventilation system. Summary of the Invention

[0005] The purpose of the present invention is to provide an intelligent energy-saving laboratory ventilation system, which has the advantages of intelligent energy saving and real-time adjustment of air volume, and solves the problems that the exhaust and supply air in the ventilation system are mostly in a fixed quantity mode, resulting in ineffective energy consumption, and the adjustment of the air volume mainly relies on manual operation and cannot respond to environmental changes in real time, thereby reducing the use effect of the laboratory ventilation system.

[0006] To achieve the above object, the present invention provides the following technical solution: An intelligent power-saving laboratory ventilation system, comprising a air supply mechanism, including a heating component for heating the supply air, and a air supply component for supplying air, an exhaust component, including an exhaust fan, an exhaust duct communicating with the outlet of the exhaust fan, a filter communicating with the inlet of the exhaust duct, an exhaust main duct communicating with the inlet of the filter, an exhaust hood installed above the laboratory operation table, an exhaust connection pipe communicating with the exhaust main duct, a Venturi valve installed on the top of the laboratory fume hood, an exhaust valve installed on the surface of the exhaust connection pipe, and an exhaust fan installed in the laboratory, and one end of the exhaust connection pipe far from the exhaust main duct is communicated with the exhaust hood, the outlet of the exhaust fan is communicated with the exhaust main duct, a control component, including a cabinet body, a PLC controller and a frequency converter fixed in the inner cavity of the cabinet body, a flow monitoring unit for monitoring the exhaust and supply air flow rates, a duct static pressure monitoring unit for monitoring the duct static pressure, a differential pressure monitoring unit for monitoring the differential pressure between the supply and exhaust air, and an environmental monitoring unit for monitoring the indoor environment of the laboratory, the output ends of the flow monitoring unit, the duct static pressure monitoring unit, the differential pressure monitoring unit and the environmental monitoring unit are all connected to the input end of the PLC controller, the output end of the PLC controller is connected to the input end of the frequency converter, the output end of the PLC controller is also connected to the input ends of the Venturi valve and the exhaust valve, and the output end of the frequency converter is connected to the input ends of the exhaust fan and the exhaust fan.

[0007] Preferably, the heating component includes an air inlet box, air filters and electric heaters fixed at both ends of the inner cavity of the air inlet box, and a thermocouple for monitoring the heating temperature, the air filter is located on the air inlet side of the inner cavity of the air inlet box, the electric heater is located on the air outlet side of the inner cavity of the air inlet box, the output end of the thermocouple is connected to the input end of the PLC controller, and the output end of the PLC controller is connected to the input end of the electric heater.

[0008] Preferably, the air supply component includes an air supply fan, an air supply main duct communicating with the outlet of the air supply fan, an indoor air duct machine installed on the top of the laboratory, an air supply branch pipe communicating with the indoor air duct machine, a quantitative air duct communicating with the air supply main duct, a louver valve communicating with the inlet of the air inlet box, a regulating valve installed on the surface of the air supply branch pipe, and a quantitative valve installed on the surface of the quantitative air duct, and the other end of the air supply branch pipe is communicated with the air supply main duct, the input end of the air supply fan is connected to the output end of the frequency converter, and the input ends of the louver valve, the regulating valve and the quantitative valve are all communicated with the output end of the PLC controller.

[0009] Preferably, the flow monitoring unit includes a flow controller fixed to the inner cavity of the cabinet, a first flow sensor installed at the inlet of the air inlet box, a second flow sensor installed on the surface of the quantitative air duct and below the quantitative valve, a third flow sensor installed at the outlet of the Venturi valve, and a fourth flow sensor installed on the surface of the air supply branch pipe.

[0010] Preferably, the duct static pressure monitoring unit includes a static pressure controller fixed to the inner cavity of the cabinet, a first static pressure sensor installed on the surface of the main air supply duct, and a second static pressure sensor installed on the surface of the main exhaust duct.

[0011] Preferably, the differential pressure monitoring unit includes a differential pressure controller fixed to the inner cavity of the cabinet, a first differential pressure sensor installed at the inlet and outlet of the air inlet box, a second differential pressure sensor installed at the inlet and outlet of the filter, a third differential pressure sensor installed on the surface of the main exhaust duct, and a fourth differential pressure sensor installed on the surface of the main air supply duct.

[0012] Preferably, the environmental monitoring unit includes a VOC sensor and a temperature and humidity sensor installed in the laboratory, a displacement sensor and a face air velocity sensor installed on the surface of the laboratory fume hood, and an infrared locator installed at the bottom of the exhaust hood, and the displacement sensor is used to monitor the position of the fume hood door.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] 1. The present invention can achieve precise intelligent control through the control component. The PLC controller receives data from the flow monitoring unit, the duct static pressure monitoring unit, the differential pressure monitoring unit, and the environmental monitoring unit, and after analysis, controls the operation of each component. The speed of the exhaust fan, the exhaust fan, and the air supply fan is adjusted through the frequency converter to provide appropriate air volume according to the actual needs of the laboratory, avoiding energy waste caused by excessive ventilation, and thus effectively reducing the energy consumption during use.

[0015] 2. The thermocouple in the heating component of the present invention can monitor the heating temperature in real time and feed the data back to the PLC controller. The controller precisely controls the operation of the electric heater according to the set temperature range, avoiding overheating and reducing energy consumption. A filter is provided in the exhaust component, which can effectively filter harmful particles and pollutants in the discharged air and prevent them from being discharged into the outdoor environment. At the same time, an air filter element is equipped in the heating component of the air supply mechanism to preliminarily filter the air entering the laboratory and ensure the cleanliness of the air sent into the room. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view structural schematic diagram of the present invention;

[0017] Figure 2 Schematic flow diagram of the exhaust air assembly of the present invention;

[0018] Figure 3 Schematic flow diagram of the air supply mechanism of the present invention;

[0019] Figure 4 Front view structural schematic diagram of the air supply mechanism of the present invention;

[0020] Figure 5 Front view structural schematic diagram of the exhaust air assembly of the present invention;

[0021] Figure 6 Schematic system flow diagram of the present invention;

[0022] Figure 7 Schematic structural diagram of the present invention.

[0023] In the figure: 100, air supply mechanism; 110, heating component; 111, air inlet box; 112, air filter; 113, electric heater; 114, thermocouple; 120, air supply assembly; 121, air supply fan; 122, main air supply duct; 123, indoor air duct machine; 124, air supply branch duct; 125, metering air duct; 126, louver damper; 127, regulating valve; 128, metering valve; 200, exhaust air assembly; 211, exhaust air fan; 212, exhaust air duct; 213, filter; 214, main exhaust duct; 215, exhaust air hood; 216, exhaust air connecting pipe; 217, Venturi valve; 218, exhaust valve; 219, exhaust fan; 300, control component; 310, cabinet; 320, PLC controller; 330, frequency converter; 340, flow monitoring unit; 341, flow controller; 342, first flow sensor; 343, second flow sensor; 344, third flow sensor; 345, fourth flow sensor; 350, pipeline static pressure monitoring unit; 351, static pressure controller; 352, first static pressure sensor; 353, second static pressure sensor; 360, differential pressure monitoring unit; 361, differential pressure controller; 362, first differential pressure sensor; 363, second differential pressure sensor; 364, third differential pressure sensor; 365, fourth differential pressure sensor; 370, environmental monitoring unit; 371, VOC sensor; 372, temperature and humidity sensor; 373, displacement sensor; 374, surface air velocity sensor; 375, infrared locator. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] Example 1

[0026] As Figure 1-7 shown, this is the first embodiment of the present invention. This embodiment provides an intelligent power-saving laboratory ventilation system, including a air supply mechanism 100, which includes a heating component 110 for heating the supply air and a air supply component 120 for supplying air; an exhaust component 200, which includes an exhaust fan 211, an exhaust duct 212 connected to the outlet of the exhaust fan 211, a filter 213 connected to the inlet of the exhaust duct 212, an exhaust main pipe 214 connected to the inlet of the filter 213, an exhaust hood 215 installed above the laboratory operation table, an exhaust connection pipe 216 connected to the exhaust main pipe 214, a Venturi valve 217 installed on the top of the laboratory fume hood, an exhaust valve 218 installed on the surface of the exhaust connection pipe 216, and an exhaust fan 219 installed in the laboratory. One end of the exhaust connection pipe 216 far from the exhaust main pipe 214 is connected to the exhaust hood 215, and the outlet of the exhaust fan 219 is connected to the exhaust main pipe 214; a control component 300, which includes a cabinet 310, a PLC controller 320 and a frequency converter 330 fixed in the inner cavity of the cabinet 310, a flow monitoring unit 340 for monitoring the exhaust and supply air flow rates, a duct static pressure monitoring unit 350 for monitoring the duct static pressure, a differential pressure monitoring unit 360 for monitoring the differential pressure between the supply and exhaust air, and an environmental monitoring unit 370 for monitoring the indoor environment of the laboratory. The output ends of the flow monitoring unit 340, the duct static pressure monitoring unit 350, the differential pressure monitoring unit 360 and the environmental monitoring unit 370 are all connected to the input end of the PLC controller 320. The output end of the PLC controller 320 is connected to the input end of the frequency converter 330. The output end of the PLC controller 320 is also connected to the input ends of the Venturi valve 217 and the exhaust valve 218. The output end of the frequency converter 330 is connected to the input ends of the exhaust fan 211 and the exhaust fan 219.

[0027] As Figure 1-7As shown in the figure, through the cooperation of the set flow monitoring unit 340, pipeline static pressure monitoring unit 350, differential pressure monitoring unit 360, and environmental monitoring unit 370, real-time monitoring of multiple sensors is achieved. The flow monitoring unit 340 can perform real-time monitoring of the flow rates at different positions such as the intake air, supply air, and exhaust air. The pipeline static pressure monitoring unit 350 can grasp the static pressure conditions of the main supply air duct 122 and the main exhaust duct 214. The differential pressure monitoring unit 360 can obtain the differential pressures of the intake air box 111, the filter 213, as well as the supply air and the exhaust air. The environmental monitoring unit 370 can monitor environmental parameters such as the VOC content, temperature and humidity, the position of the fume hood cabinet door, the face velocity, and the personnel position in the laboratory. Each monitoring unit transmits the real-time data to the PLC controller 320. The PLC controller 320 analyzes and processes these data according to the preset programs and algorithms. When the VOC sensor 371 in the environmental monitoring unit 370 detects an increase in the concentration of harmful gases in the laboratory, the PLC controller 320 issues an instruction to adjust the rotation speeds of the exhaust fan 211 and the exhaust fan 219 through the frequency converter 330, increase the exhaust air volume, and at the same time adjust the relevant valves of the air supply assembly 120 to ensure that the supply air volume matches the exhaust air volume, avoiding the ineffective energy consumption that may occur in the fixed volume mode. The exhaust air volume and the supply air volume are adjusted in real time according to the information fed back by the environmental monitoring unit 320. When it is detected that the fume hood cabinet door is opened, the PLC controller 270 automatically adjusts the opening degrees of the Venturi valve 217 and the exhaust valve 218 to increase the exhaust air volume to ensure that harmful gases are discharged in time. When the cabinet door is closed, the exhaust air volume is correspondingly reduced to lower the energy consumption. Through the coordinated work of each component, the environmental changes can be monitored in real time, the exhaust air volume and the supply air volume can be intelligently adjusted, effectively solving the problems existing in the traditional laboratory ventilation system, and improving the use effect and energy utilization efficiency of the ventilation system.

[0028] Embodiment 2

[0029] Referring to Figure 1 、 3 and 4, this is the second embodiment of the present invention. This embodiment is based on the previous embodiment.

[0030] In this embodiment, the heating assembly 110 includes an intake air box 111, air filters 112 and electric heaters 113 fixed at both ends of the inner cavity of the intake air box 111, and a thermocouple 114 for monitoring the heating temperature. The air filter 112 is located on the intake air side of the inner cavity of the intake air box 111, the electric heater 113 is located on the outlet air side of the inner cavity of the intake air box 111, the output end of the thermocouple 114 is connected to the input end of the PLC controller 320, and the output end of the PLC controller 320 is connected to the input end of the electric heater 113.

[0031] The air supply component 120 includes an air supply fan 121, an air supply main duct 122 connected to the outlet of the air supply fan 121, an indoor air duct machine 123 installed on the top of the laboratory, an air supply branch pipe 124 connected to the indoor air duct machine 123, a metering air duct 125 connected to the air supply main duct 122, a louver damper 126 connected to the inlet of the air intake box 111, a regulating valve 127 installed on the surface of the air supply branch pipe 124, and a metering valve 128 installed on the surface of the metering air duct 125. The other end of the air supply branch pipe 124 is connected to the air supply main duct 122. The input end of the air supply fan 121 is connected to the output end of the frequency converter 330. The input ends of the louver damper 126, the regulating valve 127, and the metering valve 128 are all connected to the output end of the PLC controller 320.

[0032] As Figure 1 、 3 and shown in Figure 4, the external air enters the air intake box 111 through the louver damper 126. The air filter element 112 first filters the air to remove impurities. The electric heater 113 heats the filtered air. The thermocouple 114 monitors the heating temperature in real time and transmits the temperature signal to the PLC controller 320. If the temperature does not reach the set value, the PLC controller 320 controls the electric heater 113 to continue heating. If it reaches the set value, the heating stops, realizing the precise control of the air supply temperature. The frequency converter 330 controls the air supply fan 121 to start and sends the heated air into the air supply main duct 122. A part of the air passes through the metering air duct 125, and the metering valve 128 can precisely control the air flow of this part. Another part of the air enters the indoor air duct machine 123 through the air supply branch pipe 124. The regulating valve 127 can adjust the air supply volume entering the room. The indoor air duct machine 123 evenly sends the air into the laboratory to meet the indoor ventilation requirements. The harmful gases and odors generated during the experiment are sucked in through the exhaust air hood 215 and the venturi valve 217. The venturi valve 217 can precisely control the exhaust air volume. The exhaust valve 218 can also assist in adjusting the exhaust air volume. The gas enters the exhaust main pipe 214 through the exhaust connection pipe 216. The exhaust fan 219 can accelerate the gas flow. The filter 213 filters the exhausted gas to remove harmful substances, and finally, the purified gas is discharged outdoors through the exhaust duct 212 by the exhaust fan 211.

[0033] Embodiment 3

[0034] Referring to Figure 1-7 , this is the third embodiment of the present invention, and this embodiment is based on the first two embodiments.

[0035] In this embodiment, the flow monitoring unit 340 includes a flow controller 341 fixed to the inner cavity of the cabinet 310, a first flow sensor 342 installed at the inlet of the air intake box 111, a second flow sensor 343 installed on the surface of the metering air duct 125 and below the metering valve 128, a third flow sensor 344 installed at the outlet of the venturi valve 217, and a fourth flow sensor 345 installed on the surface of the air supply branch pipe 124.

[0036] The pipeline static pressure monitoring unit 350 includes a static pressure controller 351 fixed to the inner cavity of the cabinet 310, a first static pressure sensor 352 installed on the surface of the main air supply pipe 122, and a second static pressure sensor 353 installed on the surface of the main exhaust pipe 214.

[0037] The differential pressure monitoring unit 360 includes a differential pressure controller 361 fixed to the inner cavity of the cabinet 310, a first differential pressure sensor 362 installed at the inlet and outlet of the air intake box 111, a second differential pressure sensor 363 installed at the inlet and outlet of the filter 213, a third differential pressure sensor 364 installed on the surface of the main exhaust pipe 214, and a fourth differential pressure sensor 365 installed on the surface of the main air supply pipe 122.

[0038] The environmental monitoring unit 370 includes a VOC sensor 371 and a temperature and humidity sensor 372 installed in the laboratory, a displacement sensor 373 and a face air velocity sensor 374 installed on the surface of the laboratory fume hood, and an infrared locator 375 installed at the bottom of the exhaust hood 215, and the displacement sensor 373 is used to monitor the position of the fume hood cabinet door.

[0039] As Figure 1-7 shown, the first flow sensor 342 monitors the air flow rate entering the air intake box 111, the second flow sensor 343 monitors the air flow rate in the metering air duct 125, the third flow sensor 344 monitors the exhaust air volume at the outlet of the venturi valve 217, and the fourth flow sensor 345 monitors the air supply volume in the air supply branch pipe 124. These sensors transmit the flow signals to the flow controller 341, and then the flow controller 341 feeds the signals back to the PLC controller 320. The PLC controller 320 adjusts the rotational speeds of the air supply fan 121, the exhaust fan 211, and the exhaust fan 219, or controls the opening degrees of the venturi valve 217, the exhaust valve 218, the regulating valve 127, and the metering valve 128 according to the preset flow rate value to achieve precise control of the air supply and exhaust volumes;

[0040] The first static pressure sensor 352 monitors the static pressure of the main air supply duct 122, and the second static pressure sensor 353 monitors the static pressure of the main exhaust duct 214. The monitoring signals are transmitted to the static pressure controller 351, and then fed back to the PLC controller 320 by the static pressure controller 351. The PLC controller 320 adjusts the fan speed and valve opening according to the static pressure condition to ensure the stability of the static pressure in the duct and make the ventilation system operate efficiently.

[0041] The first differential pressure sensor 362 monitors the differential pressure at the inlet and outlet of the air intake box 111, the second differential pressure sensor 363 monitors the differential pressure at the inlet and outlet of the filter 213, the third differential pressure sensor 364 monitors the differential pressure of the main exhaust duct 214, and the fourth differential pressure sensor 365 monitors the differential pressure of the main air supply duct 122. The signals are transmitted to the differential pressure controller 361, and then fed back to the PLC controller 320 by the differential pressure controller 361. The PLC controller 320 judges whether there are problems such as blockage or leakage in the system according to the differential pressure change and makes timely adjustments.

[0042] The VOC sensor 371 monitors the concentration of volatile organic compounds in the laboratory, the temperature and humidity sensor 372 monitors the indoor temperature and humidity, the displacement sensor 373 monitors the position of the ventilation cabinet door, the face velocity sensor 374 monitors the surface velocity of the ventilation cabinet, and the infrared locator 375 can locate the position of personnel. These sensors transmit the environmental parameter signals to the PLC controller 320. The PLC controller 320 automatically adjusts the supply and exhaust air volume, temperature, humidity, etc. according to the environmental conditions, so as to achieve intelligent power consumption reduction and safe ventilation.

[0043] When in use, when sending air into the laboratory, first, the outside air enters the air intake box 111 through the louver damper 126, and first passes through the air filter element 112 to filter impurities. When the outdoor temperature is relatively low, the filtered air can be heated by the electric heater 113. The thermocouple 114 monitors the heating temperature in real time and transmits the temperature signal to the PLC controller 320. If the temperature does not meet the set value, the PLC controller 320 will adjust the power of the electric heater 113 to ensure that the temperature of the sent air is appropriate. The frequency converter 330 controls the start of the air supply fan 121 to send the heated air or unheated air into the main air supply duct 122. A part of the air passes through the metering air duct 125, and the metering valve 128 can control the flow of this part of the air according to the instruction of the PLC controller 320; another part of the air passes through the air supply branch pipe 124, and the regulating valve 127 adjusts the air volume entering the indoor air duct machine 123, and the indoor air duct machine 123 evenly sends the air into the laboratory.

[0044] When the laboratory is exhausting air, the harmful gases and odors generated during the experiment are first collected by the exhaust hood 215 and the Venturi valve 217. The exhaust fan 219 assists in pumping the indoor air into the main exhaust pipe 214. The exhaust fan 211 operates to make the air pass through the main exhaust pipe 214, the filter 213, and the exhaust duct 212 in sequence and then be discharged outdoors. The filter 213 can filter harmful particles and substances, reducing environmental pollution. The Venturi valve 217 and the exhaust valve 218 can adjust the exhaust air volume according to the instructions of the PLC controller 320 to ensure the ventilation effect;

[0045] In intelligent control, the first flow sensor 342, the second flow sensor 343, the third flow sensor 344, and the fourth flow sensor 345 in the flow monitoring unit 340 respectively monitor the air flow at the inlet of the intake box 111, the metering air duct 125, the outlet of the Venturi valve 217, and the supply air branch pipe 124, and transmit the signals to the flow controller 341, and then the flow controller 341 feeds back to the PLC controller 320. The PLC controller 320 adjusts the operation of relevant valves and fans according to the flow data;

[0046] The first static pressure sensor 352 and the second static pressure sensor 353 in the pipeline static pressure monitoring unit 350 respectively monitor the static pressure of the main supply air pipe 122 and the main exhaust pipe 214, transmit the signals to the static pressure controller 351, and then the static pressure controller 351 feeds back to the PLC controller 320. The PLC controller 320 adjusts the rotation speed of the fan according to the static pressure data to maintain the stable pressure in the pipeline;

[0047] The first differential pressure sensor 362, the second differential pressure sensor 363, the third differential pressure sensor 364, and the fourth differential pressure sensor 365 in the differential pressure monitoring unit 360 respectively monitor the differential pressure at the inlet and outlet of the intake box 111, the inlet and outlet of the filter 213, the main exhaust pipe 214, and the main supply air pipe 122, transmit the signals to the differential pressure controller 361, and then the differential pressure controller 361 feeds back to the PLC controller 320. The PLC controller 320 judges the operation state of the system according to the differential pressure data, such as whether the filter 213 is blocked, etc., and makes corresponding adjustments;

[0048] The VOC sensor 371 in the environmental monitoring unit 370 monitors the concentration of volatile organic compounds in the laboratory, the temperature and humidity sensor 372 monitors the indoor temperature and humidity, the displacement sensor 373 monitors the position of the fume hood door, the face air velocity sensor 374 monitors the surface air velocity of the fume hood, and the infrared locator 375 monitors whether there is a person under the exhaust hood 215. These sensors transmit the data to the PLC controller 320, and the PLC controller 320 automatically adjusts the operation of the supply air and exhaust systems according to the environmental data to achieve intelligent power consumption reduction.

[0049] The standard parts used in this application document can all be purchased from the market, and can also be customized according to the descriptions in the specification and drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts, and equipment all adopt conventional models in the prior art. The control method is automatically controlled by a controller, and the control circuit of the controller can be realized by simple programming by those skilled in the art, which belongs to the common general knowledge in this field. Moreover, this application document is mainly used to protect the mechanical device, so the control method and circuit connection will not be explained in detail in this application document.

[0050] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device including the said element.

[0051] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An intelligent power-saving laboratory ventilation system, characterized in that: including a blowing mechanism (100) including a heating component (110) for heating the blowing air and a blowing component (120) for blowing air; an exhaust component (200) including an exhaust fan (211), an exhaust duct (212) communicated with the outlet of the exhaust fan (211), a filter (213) communicated with the inlet of the exhaust duct (212), an exhaust main pipe (214) communicated with the inlet of the filter (213), an exhaust hood (215) installed above the laboratory operation table, an exhaust connecting pipe (216) communicated with the exhaust main pipe (214), a venturi valve (217) installed on the top of the laboratory fume hood, an exhaust valve (218) installed on the surface of the exhaust connecting pipe (216), and an exhaust fan (219) installed in the laboratory. One end of the exhaust connecting pipe (216) far from the exhaust main pipe (214) is communicated with the exhaust hood (215), and the outlet of the exhaust fan (219) is communicated with the exhaust main pipe (214); a control component (300) including a cabinet body (310), a PLC controller (320) and a frequency converter (330) fixed in the inner cavity of the cabinet body (310), a flow monitoring unit (340) for monitoring the exhaust and blowing air flow rates, a pipeline static pressure monitoring unit (350) for monitoring the pipeline static pressure, a differential pressure monitoring unit (360) for monitoring the differential pressure between the blowing and exhaust air, and an environmental monitoring unit (370) for monitoring the environment in the laboratory; the output ends of the flow monitoring unit (340), the pipeline static pressure monitoring unit (350), the differential pressure monitoring unit (360) and the environmental monitoring unit (370) are all connected to the input end of the PLC controller (320), the output end of the PLC controller (320) is connected to the input end of the frequency converter (330), the output end of the PLC controller (320) is also connected to the input ends of the venturi valve (217) and the exhaust valve (218), and the output end of the frequency converter (330) is connected to the input ends of the exhaust fan (211) and the exhaust fan (219).

2. The intelligent power-saving laboratory ventilation system according to claim 1, wherein: the heating component (110) includes an air inlet box (111), air filters (112) and electric heaters (113) fixed at both ends of the inner cavity of the air inlet box (111), and a thermocouple (114) for monitoring the heating temperature. The air filters (112) are located on the air inlet side of the inner cavity of the air inlet box (111), the electric heaters (113) are located on the air outlet side of the inner cavity of the air inlet box (111), the output end of the thermocouple (114) is connected to the input end of the PLC controller (320), and the output end of the PLC controller (320) is connected to the input end of the electric heaters (113).

3. The intelligent power-saving laboratory ventilation system according to claim 2, characterized in that: The air supply assembly (120) includes an air supply fan (121), an air supply main duct (122) connected to the outlet of the air supply fan (121), an indoor air duct unit (123) installed on the top inside the laboratory, an air supply branch duct (124) connected to the indoor air duct unit (123), a metering air duct (125) connected to the air supply main duct (122), a louver damper (126) connected to the inlet of the air intake box (111), a regulating valve (127) installed on the surface of the air supply branch duct (124), and a metering valve (128) installed on the surface of the metering air duct (125). The other end of the air supply branch duct (124) is connected to the air supply main duct (122). The input end of the air supply fan (121) is connected to the output end of the frequency converter (330). The input ends of the louver damper (126), the regulating valve (127), and the metering valve (128) are all connected to the output end of the PLC controller (320).

4. An intelligent power-saving laboratory ventilation system according to claim 3, characterized in that: The flow rate monitoring unit (340) includes a flow rate controller (341) fixed to the inner cavity of the cabinet (310), a first flow rate sensor (342) installed at the inlet of the air intake box (111), a second flow rate sensor (343) installed on the surface of the metering air duct (125) and below the metering valve (128), a third flow rate sensor (344) installed at the outlet of the venturi valve (217), and a fourth flow rate sensor (345) installed on the surface of the air supply branch duct (124).

5. The intelligent power-saving laboratory ventilation system according to claim 3, wherein: The duct static pressure monitoring unit (350) includes a static pressure controller (351) fixed to the inner cavity of the cabinet (310), a first static pressure sensor (352) installed on the surface of the air supply main duct (122), and a second static pressure sensor (353) installed on the surface of the exhaust main duct (214).

6. The intelligent power-saving laboratory ventilation system according to claim 3, wherein: The differential pressure monitoring unit (360) includes a differential pressure controller (361) fixed to the inner cavity of the cabinet (310), a first differential pressure sensor (362) installed at the inlet and outlet of the air intake box (111), a second differential pressure sensor (363) installed at the inlet and outlet of the filter (213), a third differential pressure sensor (364) installed on the surface of the exhaust main duct (214), and a fourth differential pressure sensor (365) installed on the surface of the air supply main duct (122).

7. An intelligent power-saving laboratory ventilation system according to claim 1, characterized in that: The environmental monitoring unit (370) includes a VOC sensor (371) and a temperature and humidity sensor (372) installed inside the laboratory, a displacement sensor (373) and a face air velocity sensor (374) installed on the surface of the laboratory fume hood, and an infrared locator (375) installed at the bottom of the exhaust air hood (215). The displacement sensor (373) is used to monitor the position of the fume hood cabinet door.

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