An exhaust gas treatment device for laboratory fume hood

Abstract

The present invention belongs to the technical field of waste gas treatment, and in particular, relates to a waste gas treatment device for a laboratory fume hood, comprising a base and an air inlet hollow plate arranged above the base, and an adsorption filter unit arranged on one side of the air inlet hollow plate, the side wall of the adsorption filter unit is installed with a controller, and also includes: an air inlet pipe, the air inlet pipe is fixedly plugged into the end face of the air inlet hollow plate, and the air inlet pipe is connected to the air outlet end of the ventilation system of the fume hood. The present invention can discharge harmful waste gas and harmless air separately, reduce the consumption of adsorption filler, reduce the waste gas treatment load, extend the regeneration time of adsorption filler, and improve the convenience of use. Secondly, the method of compressing exhaust and static detection of waste gas can improve the accuracy of waste gas detection, and can condense water vapor and part of the volatile gas of organic solvent in the waste gas into liquid for separation. At the same time, it can remind personnel to replace or regenerate the adsorption filler in time.

Description

Technical Field

[0001] The invention belongs to the technical field of waste gas treatment, and in particular relates to a waste gas treatment device for a laboratory fume hood. Background Art

[0002] Laboratory fume hoods will generate a large amount of waste gas during experimental operations. The composition of these waste gases is complex, including various harmful substances such as organic and inorganic substances. If directly discharged, it will cause harm to the environment and personnel health. The application of waste gas treatment in fume hoods is very important. The waste gas can be purified through various technologies such as adsorption, absorption, and combustion to ensure the safety of the laboratory environment.

[0003] At present, adsorption filtration is one of the most common waste gas treatment units in laboratory fume hood waste gas treatment. It uses porous adsorbents such as activated carbon to adsorb and purify more organic waste gas and some inorganic waste gas. It is usually set at the front end of the waste gas treatment device, such as a waste gas treatment device for laboratory fume hoods disclosed in patent announcement number CN220696222U;

[0004] When the fume hood is in use, harmful exhaust gas is not continuously generated inside. For example, in the early stage of a chemical reaction, the amount of harmful exhaust gas is small, or even no harmful exhaust gas has been generated. However, the ventilation system of the fume hood is still working, and a large amount of air is sent to adsorbents such as activated carbon. Dust, water vapor, etc. in the air will occupy the adsorption pores of the activated carbon, which will not only affect the subsequent adsorption of harmful exhaust gas, but also increase the consumption of adsorbents such as activated carbon, shorten its regeneration time, and bring inconvenience to the use of the exhaust gas treatment device. In addition, due to the unstable amount of exhaust gas generation and different concentrations of exhaust gas discharged from the ventilation system, if they are all treated by the exhaust gas treatment unit, its treatment load will increase and the use effect will be poor. Summary of the invention

[0005] The object of the present invention is to provide an exhaust gas treatment device for a laboratory fume hood in view of the above problems.

[0006] To achieve the above object, the present invention adopts the following technical scheme: an exhaust gas treatment device for a laboratory fume hood, comprising a base and an air inlet hollow plate arranged above the base, and an adsorption filter unit arranged on one side of the air inlet hollow plate, wherein a controller is installed on the side wall of the adsorption filter unit, and further comprising:

[0007] An air inlet pipe is fixedly plugged into the end surface of the air inlet hollow plate, and the air inlet pipe is connected to the air outlet end of the ventilation system of the fume hood;

[0008] A ventilation pipe is installed on the end surface of the base, and the top end of the ventilation pipe passes through the air inlet hollow plate;

[0009] A plurality of air inlet cylinders are evenly distributed around the ventilation pipe in a ring shape, and each air inlet cylinder is installed on the top of the air inlet hollow plate, each of the air inlet cylinders is installed with an air inlet compression assembly connected to the air inlet hollow plate, and each of the air inlet cylinders is installed with an exhaust mechanism on the side wall, and the air inlet compression assembly is connected to the exhaust mechanism, and the exhaust mechanism is connected to the adsorption filter unit;

[0010] A condensation drainage unit, connected to the exhaust mechanism;

[0011] The resistance adjustment and recording unit is installed inside the adsorption and filtration unit, and the exhaust mechanism is electrically connected to the resistance adjustment and recording unit through a controller. The air inlet pipe is equipped with an early warning mechanism, and the resistance adjustment and recording unit is electrically connected to the early warning mechanism through a controller.

[0012] Preferably, the adsorption filtration unit includes an adsorption box fixedly mounted on the end surface of the base, and the adsorption box is arranged on one side of the air inlet hollow plate, a support net is fixedly mounted inside the adsorption box, and the interior of the adsorption box is filled with adsorption filler at a position above the support net, a lower-level connecting pipe is fixedly inserted at the upper end of the side wall of the adsorption box, and a removable box cover is installed on the top of the adsorption box.

[0013] Preferably, each of the air intake compression assemblies includes a piston plate slidably arranged inside the air intake cylinder, an electric cylinder is fixedly inserted into the top of the air intake cylinder, and the telescopic end of the electric cylinder is fixedly connected to the end face of the piston plate, an air intake hole connected to the air intake cylinder is formed on the end face of the air intake hollow plate, and an air intake electric control valve is installed inside the air intake hole, and the electric cylinder and the air intake electric control valve are both electrically connected to the controller.

[0014] Preferably, each of the exhaust mechanisms includes a compression cylinder fixedly mounted on the side wall of the air inlet cylinder, and a ventilation hole connected to the compression cylinder is opened on the side wall of the air inlet cylinder, the ventilation hole is arranged below the piston plate, a compression electric-controlled valve electrically connected to the controller is installed inside the ventilation hole, two exhaust pipes are fixedly plugged into the side wall of the compression cylinder away from the air inlet cylinder on the same side, and both exhaust pipes are connected to the ventilation pipe, a partition plate is installed inside the ventilation pipe at a position between the air outlet ends of the two exhaust pipes, a clean wind electric-controlled valve is installed inside the exhaust pipe located on the upper side, and an exhaust gas electric-controlled valve is installed inside the exhaust pipe located on the lower side, a detection component is installed on the compression cylinder, and the controller controls the operation of the clean wind electric-controlled valve and the exhaust gas electric-controlled valve according to the electrical signal output by the detection component, an adsorption tube is fixedly plugged into the side wall of the ventilation pipe, and the adsorption tube is connected to the adsorption box.

[0015] Preferably, the condensation and drainage unit includes a semiconductor condenser fixedly installed inside each compression cylinder, and the refrigeration end of the semiconductor condenser is located inside the compression cylinder, the bottom of the compression cylinder is located on one side of the semiconductor condenser and is fixedly plugged with a drain pipe, and a drain electric control valve is installed inside the drain pipe, an annular liquid storage tank is fixedly installed on the end face of the base, and the annular liquid storage tank is connected to each drain pipe, and the semiconductor condenser and the drain electric control valve are electrically connected to the controller.

[0016] Preferably, the resistance adjustment and recording unit includes an insulating round cover fixedly installed inside an adsorption box, and the insulating round cover is arranged below the supporting net, a plurality of electromagnetic push rods are fixedly installed on the inner bottom of the adsorption box, and an insulating movable block is installed on the telescopic end of each electromagnetic push rod, and a conductive ring is fixedly inserted on the end face of each insulating movable block, an insulating support rod is fixedly installed on the inner bottom of the adsorption box, and the rod wall of the insulating support rod is in sliding contact with the inner wall of the conductive ring, a resistance rod of the same diameter is fixedly installed on the top of the insulating support rod, and the detection component is electrically connected to the electromagnetic push rod through a controller.

[0017] Preferably, the early warning mechanism includes a shunt pipe fixedly inserted into the side wall of the air inlet pipe, and the air outlet end of the shunt pipe is connected to the air inlet hollow plate, a normally closed solenoid valve is installed inside the shunt pipe, and a normally open solenoid valve is installed inside the air inlet pipe at a position below the air inlet end of the shunt pipe, the conductive ring and the resistance rod are electrically connected to the normally closed solenoid valve and the normally open solenoid valve through a controller, a gas flow meter is installed inside the shunt pipe, and the gas flow meter is electrically connected to the controller.

[0018] Preferably, the detection assembly includes an opening above the compression cylinder, and a sealing cover plate matching the opening is installed on the top of the compression cylinder, and a plurality of mounting holes are provided on the end face of the sealing cover plate, wherein an exhaust gas detector is installed inside one of the mounting holes, and threaded covers are threadedly connected to the remaining mounting holes, and the controller controls the operation of the clean wind electric control valve and the exhaust gas electric control valve according to the electrical signal output by the exhaust gas detector, and the exhaust gas detector is electrically connected to each electromagnetic push rod through the controller.

[0019] Compared with the existing technology, the advantages of an exhaust gas treatment device for laboratory fume hoods are:

[0020] 1. Through the cooperation of the provided base, air inlet hollow plate, adsorption filtration unit, controller, air inlet pipe, ventilation pipe, air inlet cylinder, air inlet compression assembly and exhaust mechanism, the exhaust gas from the laboratory fume hood can be adsorbed and treated. Before the exhaust gas is adsorbed and treated, by alternating the air intake, it is possible to stably detect whether the airflow contains harmful exhaust gas, and discharge the harmful exhaust gas and harmless air separately, thereby reducing the consumption of adsorption filler, reducing the exhaust gas treatment load, extending the regeneration time of the adsorption filler, and improving the convenience of use. Secondly, the method of compressing the exhaust and statically detecting the exhaust gas can improve the accuracy of the exhaust gas detection.

[0021] 2. Through the condensation and drainage unit, the water vapor and volatile gas of organic solvent that may exist in the air flow can be condensed into liquid and discharged under the compression action of the air inlet compression component, so as to achieve the effect of pre-treatment of the exhaust gas and further reduce the consumption of adsorption filler and the load of exhaust gas treatment.

[0022] 3. Through the cooperation of the resistance recording unit and the early warning mechanism, based on the accurate detection results of the exhaust mechanism and in conjunction with the air inlet diversion method, the consumption of the adsorption filler can be automatically recorded, and the personnel can be automatically reminded to replace or regenerate the adsorption filler in time to avoid affecting the adsorption and purification effect of laboratory exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of an exhaust gas treatment device for a laboratory fume hood provided by the present invention;

[0024] Figure 2 It is a schematic diagram of the internal structure of an adsorption box of an exhaust gas treatment device for a laboratory fume hood provided by the present invention;

[0025] Figure 3 This is a schematic diagram of the connection structure between an air inlet duct and a ventilation pipe of an exhaust gas treatment device for a laboratory fume hood provided by the present invention;

[0026] Figure 4 The invention provides an exhaust gas treatment device for a laboratory fume hood. Figure 3 A magnified view of the structure of part A;

[0027] Figure 5 It is a schematic diagram of the connection structure of a conductive ring and a resistance rod of an exhaust gas treatment device for a laboratory fume hood provided by the present invention;

[0028] Figure 6 The present invention is a schematic cross-sectional structural diagram of an insulating round cover of an exhaust gas treatment device for a laboratory fume hood provided by the present invention.

[0029] In the figure: 1 base, 2 air inlet hollow plate, 3 adsorption filter unit, 31 adsorption box, 32 support net, 33 adsorption filler, 34 lower connecting pipe, 35 box cover, 4 controller, 5 air inlet pipe, 6 ventilation pipe, 7 air inlet cylinder, 8 air inlet compression assembly, 81 piston plate, 82 electric cylinder, 83 air inlet hole, 84 air inlet electric control valve, 9 exhaust mechanism, 91 compression cylinder, 92 ventilation hole, 93 compression electric control valve, 94 exhaust pipe, 95 partition plate, 96 clean air electric control valve, 97 exhaust gas electric control valve, 98 adsorption tube, 10 condensation drainage unit , 101 semiconductor condenser, 102 drain pipe, 103 drain electric control valve, 104 annular liquid storage tank, 11 resistance adjustment recording unit, 111 insulating round cover, 112 electromagnetic push rod, 113 insulating movable block, 114 conductive ring, 115 insulating support rod, 116 resistance rod, 12 early warning mechanism, 121 shunt pipe, 122 normally closed solenoid valve, 123 normally open solenoid valve, 124 gas flow meter, 13 detection component, 131 opening, 132 sealing cover, 133 mounting hole, 134 exhaust gas detector, 135 threaded cover. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] like Figure 1-Figure 6 As shown, an exhaust gas treatment device for a laboratory fume hood includes a base 1 and an air inlet hollow plate 2 arranged above the base 1, and an adsorption filter unit 3 arranged on one side of the air inlet hollow plate 2, a controller 4 is installed on the side wall of the adsorption filter unit 3, and also includes: an air inlet pipe 5, the air inlet pipe 5 is fixedly plugged into the end face of the air inlet hollow plate 2, and the air inlet pipe 5 is connected to the air outlet end of the ventilation system of the fume hood, a ventilation pipe 6 is installed on the end face of the base 1, and the top end of the ventilation pipe 6 passes through the air inlet hollow plate 2, the adsorption filter unit 3 It includes an adsorption box 31 fixedly installed on the end face of the base 1, and the adsorption box 31 is arranged on one side of the air inlet hollow plate 2, a support net 32 ​​is fixedly installed inside the adsorption box 31, and the position inside the adsorption box 31 above the support net 32 ​​is filled with adsorption filler 33, a lower-level connecting pipe 34 is fixedly inserted at the upper end of the side wall of the adsorption box 31, a detachable box cover 35 is installed on the top of the adsorption box 31, and a baffle net is installed at the lower-level connecting pipe 34 to prevent the adsorption filler 33 from being discharged into the lower-level connecting pipe 34 along with the airflow.

[0032] A plurality of air inlet cylinders 7 are evenly distributed in a ring shape around the ventilation pipe 6, and each air inlet cylinder 7 is installed on the top of the air inlet hollow plate 2, and each air inlet cylinder 7 is installed with an air inlet compression assembly 8 connected with the air inlet hollow plate 2, and each air inlet compression assembly 8 includes a piston plate 81 slidably arranged inside the air inlet cylinder 7, an electric cylinder 82 is fixedly inserted at the top of the air inlet cylinder 7, and the telescopic end of the electric cylinder 82 is fixedly connected to the end face of the piston plate 81, an air inlet hole 83 connected with the air inlet cylinder 7 is opened on the end face of the air inlet hollow plate 2, and an air inlet electric control valve 84 is installed inside the air inlet hole 83, and the electric cylinder 82 and the air inlet electric control valve 84 are both electrically connected to the controller 4.

[0033] An exhaust mechanism 9 is installed on the side wall of each air inlet cylinder 7, and the air inlet compression assembly 8 is connected to the exhaust mechanism 9, and the exhaust mechanism 9 is connected to the adsorption filter unit 3. Each exhaust mechanism 9 includes a compression cylinder 91 fixedly installed on the side wall of the air inlet cylinder 7, and the side wall of the air inlet cylinder 7 is provided with a ventilation hole 92 connected to the compression cylinder 91, and the ventilation hole 92 is arranged below the piston plate 81. A compression electric control valve 93 electrically connected to the controller 4 is installed inside the ventilation hole 92. The side wall of the compression cylinder 91 away from the air inlet cylinder 7 on the same side is fixedly plugged with two exhaust pipes 94, and Both exhaust pipes 94 are connected to the ventilation pipe 6. A partition plate 95 is installed inside the ventilation pipe 6 at a position between the air outlet ends of the two exhaust pipes 94. A clean wind electric-controlled valve 96 is installed inside the exhaust pipe 94 located on the upper side, and an exhaust gas electric-controlled valve 97 is installed inside the exhaust pipe 94 located on the lower side. The compression cylinder 91 is installed with a detection component 13. The controller 4 controls the operation of the clean wind electric-controlled valve 96 and the exhaust gas electric-controlled valve 97 according to the electrical signal output by the detection component 13. An adsorption tube 98 is fixedly inserted into the side wall of the ventilation pipe 6, and the adsorption tube 98 is connected to the adsorption box 31.

[0034] The detection component 13 includes an opening 131 opened above the compression cylinder 91, and a sealing cover plate 132 matching the opening 131 is installed on the top of the compression cylinder 91. A plurality of mounting holes 133 are opened on the end face of the sealing cover plate 132. An exhaust gas detector 134 is installed inside one of the mounting holes 133, and the remaining mounting holes 133 are all threadedly connected with threaded covers 135. The controller 4 controls the operation of the clean wind electric control valve 96 and the exhaust gas electric control valve 97 according to the electrical signal output by the exhaust gas detector 134. The exhaust gas detector 134 is electrically connected to each electromagnetic push rod 112 through the controller 4. Various types of exhaust gas detectors 134 can be installed as required through the mounting holes 133.

[0035] The condensation and drainage unit 10 is connected to the exhaust mechanism 9, and the condensation and drainage unit 10 includes a semiconductor condenser 101 fixedly installed inside each compression cylinder 91, and the cooling end of the semiconductor condenser 101 is located inside the compression cylinder 91, and the bottom of the compression cylinder 91 is located on one side of the semiconductor condenser 101 and is fixedly plugged with a drainage pipe 102, and a drainage electric control valve 103 is installed inside the drainage pipe 102, and an annular liquid storage tank 104 is fixedly installed on the end face of the base 1, and the annular liquid storage tank 104 is connected to each drainage pipe 102, the semiconductor condenser 101 and the drainage electric control valve 103 are both electrically connected to the controller 4, and the semiconductor condenser 101 integrates multiple semiconductor refrigeration rods. In order to ensure its continuous cooling effect, a cooling fan can be installed at the hot end of the semiconductor condenser 101, and a wastewater discharge pipe is left on the side wall of the annular liquid storage tank 104 for discharging the waste liquid inside the annular liquid storage tank 104.

[0036] The resistance adjustment and recording unit 11 is installed inside the adsorption and filtration unit 3, and the exhaust mechanism 9 is electrically connected to the resistance adjustment and recording unit 11 through the controller 4. The resistance adjustment and recording unit 11 includes an insulating round cover 111 fixedly installed inside the adsorption box 31, and the insulating round cover 111 is arranged below the supporting net 32. A plurality of electromagnetic push rods 112 are fixedly installed on the inner bottom of the adsorption box 31, and an insulating movable block 113 is installed at the telescopic end of each electromagnetic push rod 112, and a conductive ring 114 is fixedly inserted on the end face of each insulating movable block 113. An insulating support rod 115 is fixedly installed on the inner bottom of the adsorption box 31, and the rod wall of the insulating support rod 115 is in sliding contact with the inner wall of the conductive ring 114, and a resistance rod 116 of the same diameter is fixedly installed on the top of the insulating support rod 115. The detection component 13 is electrically connected to the electromagnetic push rod 112 through the controller 4. After the position of the conductive ring 114 on the resistance rod 116 changes, the connection loop resistance of the resistance rod 116 and the conductive ring 114 changes synchronously.

[0037] The air inlet pipe 5 is installed with an early warning mechanism 12, and the resistance adjustment and recording unit 11 is electrically connected to the early warning mechanism 12 through the controller 4. The early warning mechanism 12 includes a shunt pipe 121 fixedly plugged into the side wall of the air inlet pipe 5, and the air outlet end of the shunt pipe 121 is communicated with the air inlet hollow plate 2. A normally closed solenoid valve 122 is installed inside the shunt pipe 121, and a normally open solenoid valve 123 is installed inside the air inlet pipe 5 at a position below the air inlet end of the shunt pipe 121. The conductive ring 114 and the resistance rod 116 are electrically connected to the normally closed solenoid valve 122 and the normally open solenoid valve 123 through the controller 4. A gas flow meter 124 is installed inside the shunt pipe 121, and the gas flow meter 124 is electrically connected to the controller 4. After the metered gas reaches the set value, the gas flow meter 124 can output an electrical signal to the controller 4, and the controller 4 issues an alarm prompt based on the electrical signal.

[0038] The operating principle of the present invention is now described as follows: the air inlet pipe 5 is connected to the air outlet end of the ventilation system of the laboratory fume hood, and the controller 4 is connected to the external power supply line, and then a proper amount of adsorption filler 33 is filled in the adsorption box 31, and the lower connecting pipe 34 is connected to the air inlet end of the next-level exhaust gas treatment unit (the next-level exhaust gas treatment unit refers to the further treatment of the exhaust gas after adsorption purification, such as spray neutralization treatment, catalytic combustion treatment, etc.), when the laboratory exhaust gas needs to be treated, the controller 4 is started;

[0039] The exhaust gas generated by the laboratory fume hood will be transported to the inside of the air inlet pipe 5 under the action of its ventilation system, and then enter the inside of the air inlet hollow plate 2. After the controller 4 is started, it will first control the air inlet electric control valve 84 inside one of the air inlet holes 83 to be energized for 3 seconds, and then start the remaining air inlet electric control valves 84 in turn in a clockwise direction. When the air inlet electric control valve 84 is energized and opened, the controller 4 controls the telescopic end of the electric cylinder 82 on this side to perform a return stroke, so that the piston plate 81 moves upward. At this time, under the action of the air inlet pressure of the fume hood ventilation system and the negative pressure suction generated when the piston plate 81 moves upward, the air flow transported by the ventilation system will be sucked into the air inlet cylinder 7. When the air inlet electric control valve 84 finishes working, the lower An air intake electric control valve 84 is energized in sequence, and the air flow will enter the next air intake cylinder 7 at this time. Since each air intake electric control valve 84 is energized and opened in sequence, the normal air supply of the ventilation system will not be affected. After the telescopic end of the electric cylinder 82 moves back to the set height, the controller 4 will immediately control the electric cylinder 82 to extend (a travel switch is provided on the telescopic rod of the electric cylinder 82, and the controller 4 controls the operation of the electric cylinder 82 according to the electrical signal output by the travel switch), so that the piston plate 81 moves downward immediately. At the same time, the controller 4 controls the compression electric control valve 93 on this side to be energized and opened. At this time, since the piston plate 81 moves downward and the air intake electric control valve 84 is no longer energized, the air flow inside the air intake cylinder 7 will be compressed into the compression cylinder 91.

[0040] When the controller 4 controls the compression electric control valve 93 to be energized, it will control the exhaust gas detector 134 on this side to start, and the exhaust gas detector 134 will detect the exhaust gas concentration in the airflow. Since the airflow is compressed, the concentration of the exhaust gas in the airflow increases, so the exhaust gas detector 134 detects the exhaust gas concentration more accurately. When the exhaust gas concentration exceeds the threshold, the exhaust gas detector 134 will output an electrical signal to the controller 4. For example, when detecting benzene in the exhaust gas, when the benzene-containing exhaust gas enters the detection chamber of the exhaust gas detector 134, the exhaust gas detector 134 will emit ultraviolet light of a certain energy, and the benzene molecules will absorb the energy of the ultraviolet light and be ionized into positive ions and electrons. Under the action of the electric field, these ions and electrons move toward the electrode to form an electric current. The magnitude of the current is proportional to the concentration of benzene. When the airflow inside the compression cylinder 91 does not contain benzene, the exhaust gas detector 134 will not output an electrical signal to the controller 4. 7 seconds after the compression electric control valve 93 is energized and opened, the controller The controller 4 will control the clean wind electric control valve 96 to be powered on and opened for 5 seconds. At this time, the airflow inside the compression cylinder 91 will be discharged into the ventilation pipe 6 through the upper exhaust pipe 94, and finally discharged into the outdoor air through the ventilation pipe 6 (because the airflow does not contain benzene, it will not cause pollution to the air environment). When the airflow contains benzene, the exhaust gas detector 134 will output an electrical signal to the controller 4. At this time, the controller 4 will control the exhaust gas electric control valve 97 to be powered on and opened for 5 seconds 7 seconds after the compression electric control valve 93 is powered on and opened. At this time, the exhaust gas will be discharged into the ventilation pipe 6 through the lower exhaust pipe 94, and the airflow will eventually enter the adsorption box 31 through the adsorption tube 98. The adsorption filler 33 in the adsorption box 31 adsorbs and purifies the benzene in the exhaust gas, and the exhaust gas after adsorption and purification enters the next-level exhaust gas treatment unit through the lower-level connecting pipe 34 (wherein, after the clean wind electric control valve 96 or the exhaust gas electric control valve 97 is powered on, the controller 4 controls the compression electric control valve 93 on this side to be powered off and closed);

[0041] Since each air inlet cylinder 7 intermittently and alternately intakes air, the airflow inside each compression cylinder 91 is intermittently and alternately discharged through the ventilation pipe 6, so that before the exhaust gas is passed into the adsorption box 31, the airflow without harmful exhaust gas or the airflow containing harmful exhaust gas with a safe concentration can be directly discharged, so that it will not cause consumption of the adsorption filler 33. Secondly, when the airflow inside the air inlet cylinder 7 is compressed into the compression cylinder 91, the pressure of the airflow is increased due to the compression of the airflow, so that the substances in the exhaust gas are more likely to reach a saturated state, and the refrigeration effect of the semiconductor condenser 101 can make the water content of the exhaust gas The saturated vapor pressure of water vapor and organic waste gas volatiles is reduced, which promotes more water vapor and organic waste gas volatiles to condense into liquid, so that the water vapor and part of the organic waste gas in the waste gas will condense into liquid inside the compression cylinder 91, thereby reducing the water vapor and organic waste gas in the waste gas, and further reducing the waste gas consumption of the adsorption filler 33. The controller 4 controls each drain electric control valve 103 to be energized for 10 seconds every 30 minutes, so that the liquid inside the compression cylinder 91 flows into the annular liquid storage tank 104 through the drain pipe 102, so as to facilitate the centralized treatment of the condensed waste liquid;

[0042] When the controller 4 receives the electrical signal output by the exhaust gas detector 134, the controller 4 will amplify the electrical signal output by the exhaust gas detector 134 in proportion and pass it to the corresponding electromagnetic push rod 112. After the electromagnetic push rod 112 is energized, it will push its own insulating movable block 113 to drive the conductive ring 114 to move upward, so as to adjust the position of the conductive ring 114 at the resistor rod 116 on the same side. Taking benzene in the airflow as an example, when the concentration of benzene is higher, the electrical signal strength output by the exhaust gas detector 134 is higher. At this time, the greater the current passed into the electromagnetic push rod 112, the greater the conductive ring 114 is. The greater the upward movement height of 14, when the controller 4 starts the exhaust gas electric control valve 97, the controller 4 connects the conductive ring 114 and the resistor rod 116 on this side with the connection circuit of the normally closed solenoid valve 122 inside the shunt pipe 121 and the normally open solenoid valve 123 inside the air inlet pipe 5. If the height of the conductive ring 114 is higher, the length of the resistor rod 116 connected to the connection circuit of the conductive ring 114, the normally open solenoid valve 123 and the normally closed solenoid valve 122 is shorter. At this time, the greater the current passed into the normally open solenoid valve 123 and the normally closed solenoid valve 122, the greater the current passed into the normally open solenoid valve 123. When the flow is larger, the magnetic attraction force generated by the electromagnetic component inside it is larger, so the degree of adsorption of its valve plate closure is larger. Similarly, the normally closed electromagnetic valve 122 attracts the valve plate to a larger extent. Therefore, the airflow discharged into the air inlet hollow plate 2 through the shunt pipe 121 increases, while the airflow discharged into the air inlet hollow plate 2 through the air inlet pipe 5 decreases. At this time, more airflow will pass through the gas flow meter 124, so the gas flow rate recorded by the gas flow meter 124 increases in speed. On the contrary, when the exhaust gas concentration is low, the gas flow rate recorded by the gas flow meter 124 decreases in speed. Therefore, the gas flow meter 12 4 can measure the amount of gas passing through based on the concentration of the exhaust gas, and the concentration of the exhaust gas is closely related to the consumption of the adsorption filler 33. When the exhaust gas concentration is higher, the consumption of the adsorption filler 33 increases, and vice versa, the consumption of the adsorption filler 33 decreases. Therefore, the consumption of the adsorption filler 33 can be reflected by the gas flow meter 124. After the gas flow meter 124 reaches the set value, the gas flow meter 124 will output an electrical signal to the controller 4, and the controller 4 will immediately issue an alarm prompt. After receiving the alarm prompt information, the personnel should replace or regenerate the adsorption filler 33 in time;

[0043] Among them, the waste gas generated by the laboratory fume hood is diverse, so different waste gas detectors 134 can be installed at the sealing cover 132, and the newly installed waste gas detector 134 also needs to be connected to the controller 4. As long as one of the waste gas detectors 134 outputs an electrical signal to the controller 4, the controller 4 controls the waste gas electric control valve 97 on this side to be energized and opened. In order to ensure the accuracy of the consumption metering of the adsorption filler 33, the air inlet pipe 5 can be divided into multiple air outlets, and a normally open solenoid valve 123 is installed inside each air outlet, and the diversion pipe 121 is divided into multiple air inlets, and a normally closed solenoid valve 122 is installed inside each air inlet. The controller 4 controls the opening and closing degree of each normally open solenoid valve 123 and the normally closed solenoid valve 122 according to the electrical signal output by each waste gas detector 134, so as to achieve the effect of measuring the consumption of the adsorption filler 33.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An exhaust gas treatment device for a laboratory fume hood, comprising a base (1) and an air inlet hollow plate (2) arranged above the base (1), and an adsorption filter unit (3) arranged on one side of the air inlet hollow plate (2), wherein a controller (4) is installed on a side wall of the adsorption filter unit (3), characterized in that: Also includes: An air inlet pipe (5) is fixedly plugged into the end surface of the air inlet hollow plate (2), and the air inlet pipe (5) is connected to the air outlet end of the ventilation system of the fume hood; A ventilation pipe (6) is mounted on the end surface of the base (1), and the top end of the ventilation pipe (6) penetrates the air inlet hollow plate (2); A plurality of air inlet cylinders (7) are evenly distributed in a ring shape around the ventilation pipe (6), and each air inlet cylinder (7) is installed on the top of the air inlet hollow plate (2), each of the air inlet cylinders (7) is installed with an air inlet compression assembly (8) connected to the air inlet hollow plate (2), and each of the air inlet cylinders (7) is installed with an exhaust mechanism (9) on the side wall, and the air inlet compression assembly (8) is connected to the exhaust mechanism (9), and the exhaust mechanism (9) is connected to the adsorption filter unit (3); A condensation drainage unit (10) connected to the exhaust mechanism (9); The resistance adjustment and recording unit (11) is installed inside the adsorption and filtration unit (3), and the exhaust mechanism (9) is electrically connected to the resistance adjustment and recording unit (11) through the controller (4); the air inlet pipe (5) is installed with an early warning mechanism (12), and the resistance adjustment and recording unit (11) is electrically connected to the early warning mechanism (12) through the controller (4); The adsorption filter unit (3) comprises an adsorption box (31) fixedly mounted on the end surface of the base (1), and the adsorption box (31) is arranged on one side of the air inlet hollow plate (2), a support net (32) is fixedly mounted inside the adsorption box (31), and an adsorption filler (33) is filled in the position above the support net (32) inside the adsorption box (31), a lower-level connecting pipe (34) is fixedly plugged into the upper end of the side wall of the adsorption box (31), and a detachable box cover (35) is mounted on the top of the adsorption box (31); Each of the air intake compression assemblies (8) comprises a piston plate (81) slidably arranged inside the air intake cylinder (7); an electric cylinder (82) is fixedly inserted into the top of the air intake cylinder (7); and the telescopic end of the electric cylinder (82) is fixedly connected to the end surface of the piston plate (81); an air intake hole (83) connected to the air intake cylinder (7) is formed on the end surface of the air intake hollow plate (2); and an air intake electric control valve (84) is installed inside the air intake hole (83); and the electric cylinder (82) and the air intake electric control valve (84) are both electrically connected to the controller (4); Each of the exhaust mechanisms (9) comprises a compression cylinder (91) fixedly mounted on the side wall of the air inlet cylinder (7), and a ventilation hole (92) connected to the compression cylinder (91) is provided on the side wall of the air inlet cylinder (7), the ventilation hole (92) is arranged below the piston plate (81), a compression electric control valve (93) electrically connected to the controller (4) is installed inside the ventilation hole (92), two exhaust pipes (94) are fixedly plugged into the side wall of the compression cylinder (91) away from the air inlet cylinder (7) on the same side, and the two exhaust pipes (94) are connected to the ventilation pipe (6), and the interior of the ventilation pipe (6) is located A partition plate (95) is installed between the outlet ends of the two exhaust pipes (94); a clean air electric control valve (96) is installed inside the exhaust pipe (94) located on the upper side, and a waste gas electric control valve (97) is installed inside the exhaust pipe (94) located on the lower side; a detection component (13) is installed on the compression cylinder (91); the controller (4) controls the operation of the clean air electric control valve (96) and the waste gas electric control valve (97) according to an electrical signal output by the detection component (13); an adsorption tube (98) is fixedly plugged into the side wall of the ventilation pipe (6), and the adsorption tube (98) is connected to the adsorption box (31); The resistance adjustment recording unit (11) comprises an insulating round cover (111) fixedly mounted inside an adsorption box (31), and the insulating round cover (111) is arranged below a supporting net (32); a plurality of electromagnetic push rods (112) are fixedly mounted on the inner bottom of the adsorption box (31), and an insulating movable block (113) is mounted on the telescopic end of each electromagnetic push rod (112), and a conductive ring (114) is fixedly plugged into the end surface of each insulating movable block (113); an insulating support rod (115) is fixedly mounted on the inner bottom of the adsorption box (31), and the rod wall of the insulating support rod (115) is in sliding contact with the inner wall of the conductive ring (114); a resistance rod (116) of the same diameter is fixedly mounted on the top of the insulating support rod (115); and the detection component (13) is electrically connected to the electromagnetic push rod (112) via a controller (4).

2. The waste gas treatment device for a laboratory fume hood according to claim 1, characterized in that: The condensation and drainage unit (10) comprises a semiconductor condenser (101) fixedly mounted inside each compression cylinder (91), and a refrigeration end of the semiconductor condenser (101) is located inside the compression cylinder (91); a drainage pipe (102) is fixedly plugged into the bottom of the compression cylinder (91) at a position located on one side of the semiconductor condenser (101), and a drainage electric control valve (103) is installed inside the drainage pipe (102); an annular liquid storage tank (104) is fixedly mounted on the end surface of the base (1), and the annular liquid storage tank (104) is connected to each drainage pipe (102); and the semiconductor condenser (101) and the drainage electric control valve (103) are both electrically connected to a controller (4).

3. The waste gas treatment device for a laboratory fume hood according to claim 1, characterized in that: The early warning mechanism (12) comprises a shunt pipe (121) fixedly plugged into a side wall of an air inlet pipe (5), and an air outlet end of the shunt pipe (121) is connected to an air inlet hollow plate (2); a normally closed solenoid valve (122) is installed inside the shunt pipe (121); a normally open solenoid valve (123) is installed inside the air inlet pipe (5) at a position below the air inlet end of the shunt pipe (121); the conductive ring (114) and the resistance rod (116) are electrically connected to the normally closed solenoid valve (122) and the normally open solenoid valve (123) through a controller (4); a gas flow meter (124) is installed inside the shunt pipe (121), and the gas flow meter (124) is electrically connected to the controller (4).

4. The waste gas treatment device for a laboratory fume hood according to claim 1, characterized in that: The detection assembly (13) comprises an opening (131) formed above the compression cylinder (91), and a sealing cover plate (132) matching the opening (131) is installed on the top of the compression cylinder (91), and a plurality of mounting holes (133) are formed on the end surface of the sealing cover plate (132), wherein an exhaust gas detector (134) is installed inside one of the mounting holes (133), and threaded covers (135) are threadedly connected to the remaining mounting holes (133). The controller (4) controls the operation of the clean air electric control valve (96) and the exhaust gas electric control valve (97) according to an electrical signal output by the exhaust gas detector (134), and the exhaust gas detector (134) is electrically connected to each electromagnetic push rod (112) through the controller (4).

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