Dynamic airflow feedback regulation type laboratory energy-saving ventilation cabinet

Abstract

The invention relates to the technical field of laboratory fume cupboards, in particular to a dynamic airflow feedback control type laboratory energy-saving fume cupboard which comprises a cupboard body, the cupboard body is divided into a test area, an upper permeation area and a lower powder area, the front end of the test area is provided with a transparent push door capable of ascending and descending, and the bottom of the test area is provided with a door control adjusting mechanism. An adjustable flow guide assembly is arranged on the inner wall of the rear end of the experiment area, an air supplement mechanism is arranged at the bottom of the gating adjusting mechanism, a filter screen is embedded in the partition position of the upper permeation area and the experiment area, the top of the upper permeation area is connected with a bent ventilation pipeline, and a frequency conversion fan is arranged at the bottom of the ventilation pipeline. By means of cooperative linkage of the sensor, the door control adjusting mechanism, the flow guide assembly and the air supplement mechanism, dynamic feedback regulation and control of airflow in the ventilation cabinet are achieved, the operation state is automatically adjusted according to environment parameters changing in real time in the experiment process, and then the adaptability, safety and energy saving performance of the ventilation cabinet are improved in an all-around mode.

Description

Technical Field

[0001] This invention relates to the field of laboratory fume hood technology, specifically a dynamic airflow feedback control type energy-saving laboratory fume hood. Background Technology

[0002] As a core safety device in laboratories, fume hoods are mainly used to exhaust toxic and harmful gases, dust and volatile substances generated during experiments. Their ventilation efficiency and operational stability are directly related to the personal safety of laboratory personnel and the quality of the experimental environment. At the same time, energy efficiency is also a key indicator that is of great concern in the operation and maintenance of laboratory equipment. It is of great significance for reducing the overall operating cost of laboratories and achieving green and low-carbon operation.

[0003] However, existing laboratory fume hoods still have many technical shortcomings in practical applications, making it difficult to achieve a synergistic optimization of ventilation safety, adaptability, and energy efficiency. On the one hand, traditional fume hoods mostly adopt a constant air velocity and fixed door opening design, which cannot adjust the operating status according to the dynamic changes of environmental parameters such as pollutant concentration and temperature during the experiment. This results in either energy waste due to excessive air velocity or pollutant retention due to insufficient air velocity, posing safety hazards and energy-saving shortcomings. On the other hand, the functions of conventional fume hoods, such as door adjustment, airflow guidance, and make-up air supply, are mostly independently controlled, lacking a linkage and coordination mechanism. This can easily lead to problems such as uneven airflow distribution and air pressure imbalance, which not only affects ventilation efficiency but may also cause external pollutants to enter the experimental area due to negative pressure backflow, interfering with the experimental process.

[0004] In addition, some existing fume hoods with adjustable functions are not convenient to clean and maintain. After long-term use, dust accumulation on the transparent sliding door surface can affect the field of vision and may cause airflow disturbance due to dust accumulation, further reducing ventilation stability.

[0005] To address the aforementioned technical bottlenecks, and guided by the goal of achieving integrated operation of fume hoods with dynamic adaptability, energy efficiency, and safety and stability, an improved scheme is proposed that adopts sensor feedback control and multi-mechanism collaborative linkage. This scheme aims to optimize airflow distribution and balance air pressure and energy consumption through automated and precise control, thereby solving the problems of poor adaptability, high energy consumption, and insufficient safety of traditional fume hoods and meeting the usage needs of diverse laboratory experimental scenarios.

[0006] To address this technical deficiency, a solution is proposed. Summary of the Invention

[0007] The purpose of this invention is to achieve dynamic feedback control of airflow inside the fume hood by means of the coordinated linkage of sensors, gate control adjustment mechanism, air guiding component and air supply mechanism, and to automatically adjust the operating status according to the real-time changes of environmental parameters during the experimental process, thereby comprehensively improving the adaptability, safety and energy efficiency of the fume hood.

[0008] The objective of this invention can be achieved through the following technical solution: A dynamic airflow feedback control type laboratory energy-saving fume hood includes a cabinet body, which is divided into a test area, an upper infiltration area and a lower powder area. The front end of the test area is equipped with a transparent sliding door that can be raised and lowered, and the bottom of the door is equipped with a door control adjustment mechanism. An adjustable air guiding component is provided on the inner wall of the rear end of the test area. An air supply mechanism is provided at the bottom of the door control adjustment mechanism. A filter screen is embedded at the partition between the upper infiltration area and the test area. A bendable ventilation duct is connected to the top of the upper infiltration area, and a variable frequency fan is provided at the bottom of the ventilation duct.

[0009] Sensors are installed on the inner wall of the experimental area to monitor environmental parameters such as temperature, humidity, and gas concentration in real time. The monitoring data is transmitted to the control system. The control system automatically adjusts the gate control mechanism, air guide components, air supply mechanism, and working status based on the data fed back by the sensors to achieve dynamic airflow feedback control, taking into account both the energy efficiency of the fume hood and the safety and stability of the experimental environment.

[0010] Furthermore, the door control adjustment mechanism includes concave push frames that are snapped onto both ends of the bottom of the transparent push door, and both of them are movably connected to a horizontally arranged bottom frame at their bottoms. Spiral slide cylinders are fixedly installed on both sides of the rear end of the bottom frame, and guide rods are vertically arranged inside the spiral slide cylinders. One set of guide rods has a threaded structure on the outside and a drive motor is provided at the bottom. A conical auxiliary rotating gear is fixedly sleeved on the top of the threaded guide rod.

[0011] Furthermore, the concave push frame is fitted with flexible brush pads on its front and rear inner walls, and a vertical shaft is fixedly installed at the bottom of the concave push frame. Two sets of vertical shafts are spirally threaded through their interiors along their length, and the threads of the two sets of screws are in opposite directions. A dual-axis motor is provided at their opposite ends.

[0012] Furthermore, the flow guiding component includes a positioning frame fixedly installed at the top of the inner wall of the rear end of the test area, and a spiral slide rod is rotatably connected through one side of the top of the positioning frame. One set of the spiral slide rods extends to the top edge of the auxiliary rotating gear and is fixedly installed with a reversing gear. The reversing gear and the auxiliary rotating gear are vertically meshed. The section of the spiral slide rod located inside the positioning frame is spirally sleeved with a stop block with a tapered bottom.

[0013] Furthermore, a rotating cylinder is laterally hinged to the front position of the center inside the positioning frame, and the top of the rotating cylinder is provided with a notch that matches the bottom of the abutment block. A vertically arranged movable guide plate is fixedly installed at the bottom of the rotating cylinder, and the bottom of the movable guide plate extends to the outside of the positioning frame. The side of the movable guide plate is hinged to the inner side wall of the bottom opening slot of the positioning frame. A fixed guide plate is fixedly installed at the rear end of the bottom of the positioning frame.

[0014] Furthermore, the air supply mechanism includes a ventilation frame installed on the inner wall at the bottom of the front opening of the experimental area. Several sets of vertical cylinders are installed side by side at the front end of the inner wall at the bottom of the ventilation frame, and connecting rods are respectively hinged to both sides of the vertical cylinders. Swinging guide vanes are fixedly installed on the connecting rods away from the ends of the vertical cylinders, and an arc-shaped swing rod is hinged to the center of the rear end of each guide vane.

[0015] Furthermore, the two arc-shaped swing arms in the same group are symmetrically arranged and hinged together, and the bottom of the overlapping hinge points of multiple groups of arc-shaped swing arms are hinged together with a movable push plate. A cylinder is provided at the rear end of the movable push plate, and the cylinder is located on the base at the center of the bottom inner wall of the movable push plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] This invention constructs a full-process dynamic airflow feedback control system through the coordinated design of sensors, control systems, gating adjustment mechanisms, airflow guiding components, and air supply mechanisms.

[0018] (1) A door control adjustment mechanism is set up. The concave push frame at the bottom of the transparent push door is movably connected to the bottom frame. With the help of the spiral slide and guide rod structure, the precise up and down movement control of the push door is realized. At the same time, the dual-axis motor drives two sets of screws with opposite thread directions to rotate, so that the concave push frame moves inward or outward synchronously. With the help of the flexible brush pad, the surface dust and debris can be automatically removed during the movement of the push door, reducing the safety hazards caused by dust accumulation and reducing the equipment cleaning and maintenance costs and failure rate.

[0019] (2) Set up a flow guide component, which works in conjunction with the gate control adjustment mechanism. The guide rod rotates under the action of the drive motor, which drives the auxiliary rotating gear to rotate. Then, through the vertically meshing reversing gear, the power is transmitted to the spiral slide bar, so that the block moves up and down in the positioning frame. The movement of the block pushes the rotating drum to rotate, thereby driving the movable flow guide plate to adjust the angle and realize the dynamic guidance of the airflow in the test area.

[0020] (3) In addition, a make-up air mechanism is set up, which uses a cylinder to push the movable push plate, and through the linkage of the arc swing rod, the swing guide vane swings to precisely adjust the make-up air volume. It works in conjunction with the gate control mechanism to maintain the negative pressure environment in the test area and ensure experimental safety. Attached Figure Description

[0021] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a half-sectional view of the front of the cabinet of the present invention;

[0024] Figure 3 This is a half-sectional view of the rear of the cabinet of the present invention;

[0025] Figure 4 This is a side sectional view of the overall structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the combination of the flow guiding component and the gate control adjustment mechanism of the present invention;

[0027] Figure 6 This is a schematic diagram of the air supply mechanism of the present invention;

[0028] Figure 7 This is a top sectional view of the air supply mechanism of the present invention.

[0029] In the diagram: 1. Cabinet; 2. Transparent sliding door; 3. Door control adjustment mechanism; 31. Concave push frame; 32. Base frame; 33. Spiral slide cylinder; 34. Guide rod; 35. Drive motor; 36. Auxiliary rotating gear; 37. Vertical shaft; 38. Lead screw; 39. Dual-axis motor; 4. Air guide assembly; 41. Positioning long frame; 42. Spiral slide rod; 43. Reversing gear; 44. Stop block; 45. Rotating cylinder; 46. Movable air guide plate; 47. Fixed air guide plate; 5. Air supply mechanism; 51. Ventilation frame; 52. Vertical cylinder; 53. Connecting rod; 54. Air guide blade; 55. Arc-shaped swing arm; 56. Movable push plate; 57. Cylinder; 6. Filter screen; 7. Ventilation duct; 8. Variable frequency fan. Detailed Implementation

[0030] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1: Please refer to Figure 1 - Figure 4 As shown, a dynamic airflow feedback control type laboratory energy-saving fume hood includes a cabinet 1, which is divided into a test area, an upper infiltration area and a lower powder area. The front end of the test area is equipped with a transparent sliding door 2 that can be raised and lowered, and the bottom of the door is equipped with a door control adjustment mechanism 3. An adjustable air guide component 4 is provided on the inner wall of the rear end of the test area. The bottom of the door control adjustment mechanism 3 is equipped with a makeup air mechanism 5. A filter screen 6 is embedded in the partition between the upper infiltration area and the test area. The top of the upper infiltration area is connected to a bendable ventilation duct 7, and the bottom of the ventilation duct 7 is equipped with a variable frequency fan 8.

[0032] Sensors are installed on the inner wall of the experimental area to monitor environmental parameters such as temperature, humidity, and gas concentration in real time. The monitoring data is transmitted to the control system. The control system automatically adjusts the working status of the gate control mechanism 3, the air guide component 4, and the air supply mechanism 5 based on the data fed back by the sensors, so as to achieve dynamic airflow feedback control and balance the energy efficiency of the fume hood with the safety and stability of the experimental environment.

[0033] The door control adjustment mechanism 3 includes concave push frames 31 that are snapped onto the bottom ends of the transparent push door 2, and the bottom of both are movably connected to a horizontally arranged bottom frame 32. Spiral slide cylinders 33 are fixedly installed on both sides of the rear end of the bottom frame 32, and guide rods 34 are vertically arranged inside the spiral slide cylinders 33. One set of guide rods 34 has a threaded structure on the outside and a drive motor 35 is provided at the bottom. A conical auxiliary rotating gear 36 is fixedly sleeved on the top of the threaded guide rods 34.

[0034] In actual operation, the drive motor 35 is first started, which drives the threaded guide rod 34 to rotate. Due to the threaded engagement between the guide rod 34 and the spiral slide cylinder 33, the spiral slide cylinder 33 moves up and down along the guide rod 34, thereby driving the bottom frame 32 and the concave push frame 31 to move up and down, realizing the lifting and lowering adjustment of the transparent push door 2. According to the environmental parameters in the test area fed back by the sensor, the control system can accurately control the speed and direction of the drive motor 35, thereby flexibly adjusting the opening and closing degree of the transparent push door 2 to meet the ventilation requirements of different experiments. In addition, the variable frequency fan 8 dynamically adjusts its working frequency according to the instructions of the control system to match the actual ventilation requirements in the test area and achieve energy-saving operation.

[0035] In addition, flexible brush pads are embedded in the front and rear inner walls of the concave push frame 31, and a vertical shaft 37 is fixedly installed at the bottom of the concave push frame 31. Two sets of vertical shafts 37 are spirally threaded through the inside along the length direction, and the thread directions of the two sets of screws 38 are opposite. A dual-axis motor 39 is provided at the opposite ends of the two sets.

[0036] Therefore, after ventilation is stopped, the dual-axis motor 39 is started, driving the two sets of lead screws 38 to rotate. Since the threads of the two sets of lead screws 38 are opposite, the two sets of vertical shafts 37 move in opposite directions, thereby driving the concave push frame 31 to move back and forth. The flexible brush pad can effectively remove dust and debris from the surface of the transparent push door 2 during its movement, ensuring the cleanliness of the fume hood and reducing safety hazards caused by dust accumulation.

[0037] Example 2: Please refer to Figure 1 , Figure 4 - Figure 5As shown, the flow guiding component 4 includes a positioning frame 41 fixedly installed at the top of the inner wall of the rear end of the test area, and a spiral slide rod 42 is rotatably connected through one side of the top of the positioning frame 41. One set of spiral slide rods 42 extends to the top edge of the auxiliary rotating gear 36 and is fixedly installed with a reversing gear 43. The reversing gear 43 and the auxiliary rotating gear 36 are vertically meshed. The spiral slide rod 42 is spirally sleeved with a stop block 44 with a tapered bottom in the section inside the positioning frame 41.

[0038] A rotating cylinder 45 is horizontally hinged to the front of the center of the positioning frame 41. The top of the rotating cylinder 45 is provided with a notch that matches the bottom of the abutment block 44. A vertically arranged movable guide plate 46 is fixedly installed at the bottom of the rotating cylinder 45. The bottom of the movable guide plate 46 extends to the outside of the positioning frame 41. The side of the movable guide plate 46 is hinged to the inner side wall of the bottom opening slot of the positioning frame 41. A fixed guide plate 47 is fixedly installed at the rear end of the bottom of the positioning frame 41.

[0039] This embodiment works in conjunction with Embodiment 1. When the opening and closing degree of the transparent push door 2 is adjusted according to the component, the angle of the guide plate is also adjusted. The specific adjustment process includes: when the drive motor 35 drives the transparent push door 2 to rise and fall, the auxiliary rotating gear 36 rotates accordingly. Since the reversing gear 43 meshes perpendicularly with the auxiliary rotating gear 36, the rotation of the auxiliary rotating gear 36 will drive the reversing gear 43 and the spiral slide rod 42 connected to it to rotate. The rotation of the spiral slide rod 42 causes the abutment 44 to move along the direction of the spiral slide rod 42 within the positioning frame 41. The movement of the abutment 44 will press or release the notch groove at the top of the rotating cylinder 45, thereby driving the rotating cylinder 45 to rotate around the hinge point. The rotation of the rotating cylinder 45 further drives the movable guide plate 46 to rotate around its bottom hinge point, thereby realizing the adjustment of the angle of the movable guide plate 46.

[0040] Meanwhile, the fixed guide plate 47 remains stationary and works together with the movable guide plate 46 to form different airflow guiding channels to adapt to the ventilation needs under different opening and closing degrees of the transparent sliding door 2, ensuring uniform airflow distribution in the test area and improving ventilation effect. At the same time, this linkage adjustment method also simplifies the operation process and improves the automation level and ease of use of the fume hood. The guide component 4 can be angled according to experimental needs to optimize the airflow distribution in the test area and improve ventilation efficiency.

[0041] Example 3: Please refer to Figure 1 , Figure 6 - Figure 7 As shown, the air supply mechanism 5 includes a ventilation frame 51 installed on the inner wall of the bottom of the front opening of the experimental area. Several sets of vertical cylinders 52 are installed side by side at the front end of the bottom inner wall of the ventilation frame 51. Connecting rods 53 are respectively hinged to both sides of the vertical cylinders 52. Swinging guide vanes 54 are fixedly installed at the ends of the connecting rods 53 away from the vertical cylinders 52. An arc-shaped swing rod 55 is hinged to the center of the rear end of each guide vane 54.

[0042] Two arc-shaped swing arms 55 in the same group are symmetrically arranged and hinged together. The bottom of the overlapping hinge point of multiple groups of arc-shaped swing arms 55 is hinged together with a movable push plate 56. A cylinder 57 is provided at the rear end of the movable push plate 56, and the cylinder 57 is located on the base at the center of the bottom inner wall of the movable push plate 56.

[0043] This embodiment is based on Embodiments 1 and 2. When the gate control adjustment mechanism 3 is activated, the air supply mechanism 5 will automatically supply an appropriate amount of fresh air to maintain the air pressure balance in the test area and prevent external pollutants from entering due to negative pressure. The specific process includes: when the drive motor 35 in the gate control adjustment mechanism 3 is started and drives the transparent push door 2 to adjust its height, the cylinder 57 will act accordingly according to the control system command, pushing the movable push plate 56 to move back and forth. The movement of the movable push plate 56 will drive the multiple sets of arc-shaped swing rods 55 hinged to it to move synchronously. Since the arc-shaped swing rods 55 are hinged to the swing-type air guide vanes 54, the movement of the arc-shaped swing rods 55 will further drive the swing-type air guide vanes 54 to swing around the hinge point. By controlling the stroke of the cylinder 57, the opening and closing angle of the swing-type air guide vanes 54 is adjusted, thereby controlling the amount of fresh air entering the test area.

[0044] When the transparent sliding door 2 rises and the opening of the test area increases, the air supply mechanism 5 increases the air supply volume to maintain stable air pressure in the test area; when the transparent sliding door 2 falls, the air supply mechanism 5 reduces the air supply volume accordingly to avoid excessive air pressure in the test area. The dynamic air supply method effectively ensures the air quality in the test area and improves the energy-saving effect of the fume hood.

[0045] In summary, this invention achieves dynamic airflow feedback control through the coordinated operation of the aforementioned mechanisms. Sensors monitor and provide feedback on environmental parameters in the experimental area in real time. The control system controls the gate adjustment mechanism 3, the airflow guiding component 4, and the air supply mechanism 5 based on this data. Specifically, the gate adjustment mechanism 3 flexibly adjusts the opening and closing degree of the transparent sliding door 2 to meet different experimental ventilation needs; the airflow guiding component 4 adjusts its angle in conjunction with the opening and closing of the transparent sliding door 2 to optimize airflow distribution and improve ventilation efficiency; and the air supply mechanism 5 automatically supplies fresh air when the transparent sliding door 2 is in operation to maintain air pressure balance in the experimental area. The close cooperation of these components balances the energy efficiency of the fume hood with the safety and stability of the experimental environment, providing the laboratory with an efficient, safe, and energy-saving ventilation solution. This effectively improves the quality and efficiency of laboratory work and reduces energy consumption and safety hazards.

[0046] Working principle: When using this invention, the drive motor 35 is first started, which drives the threaded guide rod 34 to rotate. Due to the threaded engagement between the guide rod 34 and the spiral slide cylinder 33, the spiral slide cylinder 33 moves up and down along the guide rod 34, thereby driving the bottom frame 32 and the concave push frame 31 to move up and down, realizing the lifting and lowering operation of the transparent push door 2. During this process, the sensor works continuously to capture key environmental parameters such as temperature, humidity, and gas concentration in the test area in real time, and quickly transmits these data to the control system. After receiving the data, the control system immediately analyzes and processes it, and accurately calculates the current required ventilation volume and the optimal opening and closing degree of the transparent push door 2 according to the preset safety standards and experimental requirements, to ensure the ventilation effect in the test area.

[0047] Meanwhile, driven by the auxiliary rotating gear 36, the flow guiding component 4 moves the block 44 through the transmission of the reversing gear 43 and the spiral slide bar 42, thereby driving the rotation of the rotating drum 45 and the movable flow guiding plate 46, adjusting the airflow guiding channel, so that the airflow can be evenly distributed in the test area, avoiding excessive or insufficient local airflow, and improving ventilation efficiency. In this process, the movable flow guiding plate 46 and the fixed flow guiding plate 47 cooperate with each other to form a dynamic airflow guiding system to adapt to the ventilation requirements under different experimental conditions.

[0048] During the lifting and lowering adjustment of the transparent sliding door 2, the air supply mechanism 5 also works synchronously. The cylinder 57 pushes the movable push plate 56 to move back and forth according to the instructions of the control system. Through the transmission of the arc-shaped swing rod 55, the swing-type guide vane 54 swings to adjust the air supply volume. When the transparent sliding door 2 rises and the opening of the test area increases, the air supply mechanism 5 increases the air supply volume to prevent external pollutants from entering the test area due to negative pressure. When the transparent sliding door 2 falls, the air supply mechanism 5 reduces the air supply volume to avoid excessive air pressure in the test area and ensure that the air pressure in the test area always remains in a balanced state.

[0049] Through the close cooperation and collaborative work of the aforementioned institutions, the dynamic airflow feedback control type energy-saving laboratory fume hood of this invention achieves precise control and efficient ventilation of the environment within the experimental area. This not only improves the safety and stability of the experimental environment but also significantly reduces energy consumption, making a positive contribution to energy conservation, emission reduction, and sustainable development in laboratories.

[0050] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A dynamic airflow feedback control type energy-saving laboratory fume hood, characterized in that: The device includes a cabinet (1), which is divided into a test area, an upper infiltration area and a lower powder area. The front end of the test area is equipped with a transparent sliding door (2) that can be raised and lowered, and the bottom of the door is equipped with a door control adjustment mechanism (3). An adjustable air guide component (4) is provided on the inner wall of the rear end of the test area. The bottom of the door control adjustment mechanism (3) is equipped with a make-up air mechanism (5). A filter screen (6) is embedded at the partition between the upper infiltration area and the test area. The top of the upper infiltration area is connected to a bent ventilation duct (7), and the bottom of the ventilation duct (7) is equipped with a variable frequency fan (8). Sensors are installed on the inner sidewall of the experimental area. The sensors are used to monitor environmental parameters in the experimental area in real time, such as temperature, humidity, and gas concentration. The monitoring data is transmitted to the control system. The control system automatically adjusts the gate control mechanism (3), the air guide component (4), the air supply mechanism (5), and the working status based on the data fed back by the sensors, so as to realize dynamic airflow feedback control and take into account both the energy efficiency of the fume hood and the safety and stability of the experimental environment.

2. The dynamic airflow feedback control type laboratory energy-saving fume hood according to claim 1, characterized in that, The door control adjustment mechanism (3) includes concave push frames (31) that are snapped onto the bottom ends of the transparent push door (2), and the bottom of both are movably connected to a horizontally arranged bottom frame (32). The bottom frame (32) has a spiral slide cylinder (33) fixedly installed on both sides of its rear end, and a guide rod (34) is provided through the spiral slide cylinder (33) in the vertical direction. One set of the guide rods (34) has a threaded structure on the outside and a drive motor (35) is provided at the bottom. A conical auxiliary rotating gear (36) is fixedly sleeved on the top of the threaded guide rod (34).

3. The dynamic airflow feedback control type laboratory energy-saving fume hood according to claim 2, characterized in that, The concave push frame (31) has flexible brush pads embedded in its front and rear inner walls, and a vertical shaft (37) is fixedly installed at the bottom of the concave push frame (31). The two sets of vertical shafts (37) have screw rods (38) spirally passing through them along their length. The screw threads of the two sets of screw rods (38) are opposite, and a dual-axis motor (39) is provided at their opposite ends.

4. The dynamic airflow feedback control type laboratory energy-saving fume hood according to claim 1, characterized in that, The flow guiding component (4) includes a positioning frame (41) fixedly installed at the top of the inner wall of the rear end of the test area, and a spiral slide rod (42) is rotatably connected through one side of the top of the positioning frame (41). One set of the spiral slide rods (42) extends to the top edge of the auxiliary rotating gear (36) and is fixedly installed with a reversing gear (43). The reversing gear (43) and the auxiliary rotating gear (36) are vertically meshed. The spiral slide rod (42) is spirally sleeved with a stop block (44) with a tapered bottom in the section inside the positioning frame (41).

5. A dynamic airflow feedback control type laboratory energy-saving fume hood according to claim 4, characterized in that, A rotating cylinder (45) is horizontally hinged to the front of the center of the positioning frame (41), and the top of the rotating cylinder (45) is provided with a notch that matches the bottom of the abutment block (44). A vertically arranged movable guide plate (46) is fixedly installed at the bottom of the rotating cylinder (45), and the bottom of the movable guide plate (46) extends to the outside of the positioning frame (41). The side of the movable guide plate (46) is hinged to the inner side wall of the bottom opening groove of the positioning frame (41). A fixed guide plate (47) is fixedly installed at the rear end of the bottom of the positioning frame (41).

6. The dynamic airflow feedback control type laboratory energy-saving fume hood according to claim 1, characterized in that, The air supply mechanism (5) includes a ventilation frame (51) installed on the inner wall of the bottom of the front opening of the experimental area. Several sets of vertical cylinders (52) are installed side by side at the front end of the bottom inner wall of the ventilation frame (51), and connecting rods (53) are respectively hinged on both sides of the vertical cylinders (52). A swing-type air guide blade (54) is fixedly installed on the end of the connecting rod (53) away from the vertical cylinder (52). An arc-shaped swing rod (55) is hinged to the center of the rear end of each air guide blade (54).

7. A dynamic airflow feedback control type laboratory energy-saving fume hood according to claim 6, characterized in that, Two of the arc-shaped swing arms (55) in the same group are symmetrically arranged and hinged together. The bottom of the overlapping hinge point of multiple groups of arc-shaped swing arms (55) is hinged together with a movable push plate (56). A cylinder (57) is provided at the rear end of the movable push plate (56), and the cylinder (57) is located on the base at the center of the bottom inner wall of the movable push plate (56).

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