Ventilation cabinet capable of automatically adjusting air volume for laboratory

Abstract

The utility model provides an automatic air volume adjusting ventilation cabinet for a laboratory, which belongs to the technical field of experimental equipment for the laboratory and comprises a main cabinet, an experimental platform is arranged in the main cabinet, a visible window, an air exhauster and a driving mechanism are arranged on the main cabinet, slide rails are arranged on two sides of the experimental platform, and the air exhauster is arranged on the slide rails. The visual window is arranged in the sliding rail in a sliding mode, the air exhauster is arranged in the experiment platform, and the driving mechanism is connected with the visual window. The air exhaust device further comprises a sensing module and a sensed device matched with the sensing module, and the sensing module is electrically connected with the air exhaust device and the driving mechanism. By arranging the sensing module and the sensed module on the ventilation cabinet, after a worker is far away from the ventilation cabinet, the visible window of the ventilation cabinet and the air exhauster are in a closed state, dust pollution in the experiment platform is reduced, power consumption of the air exhauster is reduced, and energy waste is avoided.

Description

Technical Field

[0001] This utility model belongs to the technical field of laboratory experimental equipment, and specifically relates to a laboratory fume hood with automatic air volume adjustment. Background Technology

[0002] Laboratory fume hoods are devices used for exhaust ventilation in laboratories. Experimental operations generate various harmful gases, odors, moisture, and flammable, explosive, and corrosive substances. To protect the safety of users and prevent the spread of pollutants into the laboratory, the primary purpose of using a fume hood is to exhaust the gases generated during the experiment. There are many types of fume hoods available, and due to differences in their structure and operating conditions, their exhaust performance varies.

[0003] For example, utility model application CN201921858567.7 discloses a laboratory fume hood, including a fume hood body. An operating table is horizontally arranged inside the fume hood body, dividing the fume hood body into a ventilation chamber and a storage chamber located at the bottom of the ventilation chamber. An air collection chamber is located at the top of the ventilation chamber, and an exhaust fan is installed inside the air collection chamber. A universally adjustable telescopic hose is connected to the bottom of the air collection chamber, and an air collection hood is connected to the bottom of the telescopic hose. The air collection hood is connected to the air collection chamber via the telescopic hose. A side air duct connected to the air collection chamber is provided on the side wall of the ventilation chamber, and side air holes are opened on the side wall facing the ventilation chamber. Compared with the prior art, the beneficial effects of this utility model are: the air collection hood can be adjusted up and down as needed, and combined with the side air duct designed on the side wall, it increases the exhaust effect of waste gas or harmful gases, reduces the time polluted gases exist in the cabinet, and greatly protects the personal safety of personnel.

[0004] However, most existing fume hoods continue to exhaust air at the basic wind speed even when no one is operating them (when staff are away from the fume hood), which increases power consumption and causes energy waste, and does not conform to the management concept of energy conservation and emission reduction. Utility Model Content

[0005] Based on this, the present invention provides a laboratory fume hood with automatic air volume adjustment to solve the technical problem that in the prior art, most existing fume hoods still maintain a basic air velocity for exhaust when the staff is not operating them (the staff is away from the fume hood), which increases power consumption and causes energy waste.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0007] A laboratory fume hood with automatic air volume adjustment includes a main cabinet, an experimental platform inside the main cabinet, a viewing window, an exhaust fan and a drive mechanism on the main cabinet, slide rails on both sides of the experimental platform, the viewing window is slidably disposed in the slide rails, the exhaust fan is disposed in the experimental platform, and the drive mechanism is connected to the viewing window.

[0008] It also includes a sensing module and a sensor that is matched with the sensing module. The sensing module is electrically connected to the exhaust fan and the drive mechanism.

[0009] Preferably, the viewing window includes a meshing ring, a slider, a frame, and a transparent glass plate. The meshing ring is connected to the driving mechanism, the slider is slidably disposed within the slide rail and connected to the meshing ring, the frame is disposed on the front side of the experimental platform and connected to the slider, and the transparent glass plate is installed within the frame.

[0010] Preferably, the main cabinet is further provided with a rotating groove, and the driving mechanism includes a lead screw, a reducer and a servo motor. The lead screw is vertically arranged in the rotating groove and meshes with the engagement ring. The reducer is connected to one end of the lead screw and the servo motor is connected to the reducer.

[0011] Preferably, the exhaust fan includes an exhaust pipe, a fan, a rotating motor, and a smoke hood. The exhaust pipe is located on the top of the main cabinet, and one end of the exhaust pipe extends into the experimental platform. The fan is located inside the exhaust pipe. The rotating motor is installed on the top of the main cabinet and is connected to the fan. The smoke hood is located on the outer wall of the exhaust pipe and is situated above the experimental platform.

[0012] Preferably, the system further includes an adaptive air duct mechanism, which includes a base, a gear rail, a closing plate, and a closing motor. The base is mounted on the outer wall of the exhaust pipe and is located inside the smoke collection hood. The gear rail is mounted on the base and can rotate in a circular motion on the base. The closing plate is located inside the gear rail and meshes with it. The closing motor is mounted on the base, and its drive end meshes with the gear rail to rotate.

[0013] Preferably, the system also includes a gas sensor, which is disposed above the main cabinet and extends one end into the experimental platform.

[0014] Preferably, the system also includes a gas filter, which is disposed on the outside of the main cabinet and is connected to the exhaust fan.

[0015] Preferably, the experimental platform is also equipped with a water tank and a placement plate.

[0016] Compared with the prior art, the present invention has at least the following advantages:

[0017] By installing the sensing module and the sensed module on the fume hood, the viewing window and the exhaust fan of the fume hood will be closed when the staff moves away from the fume hood, reducing dust pollution in the experimental platform and reducing the power consumption of the exhaust fan, thus avoiding energy waste. Furthermore, this fume hood is suitable for scenarios where both arms are restricted (such as holding test tubes and recording data at the same time). When the staff approaches the fume hood, the viewing window and the exhaust fan can be opened automatically to avoid interruption of the experimental process. Attached Figure Description

[0018] Figure 1 An isometric drawing of a laboratory fume hood with automatic air volume adjustment.

[0019] Figure 2 Left view of a laboratory fume hood with automatic airflow adjustment.

[0020] Figure 3 for Figure 2 AA sectional view.

[0021] Figure 4 for Figure 3 A magnified view of part B.

[0022] Figure 5 This is a schematic diagram of the exhaust fan and adaptive air duct mechanism.

[0023] Figure 6 This is an isometric view of the adaptive air duct mechanism.

[0024] Figure 7 This is a top view of the adaptive air duct mechanism.

[0025] In the diagram: main cabinet 100, experimental platform 110, slide rail 120, rotating groove 130, water tank 140, placement plate 150, viewing window 200, meshing ring 210, slider 220, frame 230, transparent glass plate 240, exhaust fan 300, exhaust pipe 310, fan 320, rotating motor 330, smoke hood 340, drive mechanism 400, lead screw 410, reducer 420, servo motor 430, sensing module 500, sensor 510, adaptive air duct mechanism 600, base 610, gear rail 620, closing plate 630, closing motor 640, gas sensor 700, gas filter 800. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other. The technical solutions of the present invention will be further described below with reference to the accompanying drawings of the embodiments. The present invention is not limited to the specific embodiments described below.

[0027] It should be understood that the same or similar reference numerals in the accompanying drawings of the embodiments correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "front," "rear," "left," "right," "top," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0028] Please refer to Figures 1 to 7 A laboratory fume hood with automatic air volume adjustment includes a main cabinet 100, an experimental platform 110 inside the main cabinet 100, and a viewing window 200, an exhaust fan 300, and a drive mechanism 400 on the main cabinet 100.

[0029] In this embodiment, it should be noted that the experimental platform 110 is an operating space that can provide staff with a space to conduct experiments. The operating space has conventional experimental equipment, such as an experimental tabletop used for experimental operations, an experimental support frame around the experimental tabletop, storage space under the experimental tabletop, and experimental instruments placed above the experimental tabletop, which together constitute the experimental platform 100.

[0030] The experimental platform 110 is provided with slide rails 120 on both sides. That is, slide rails 120 are provided on the front frame of the main cabinet 100. The slide rails 120 are provided vertically. The slide rails 120 are provided in a conventional manner, which will not be described in detail here. The viewing window 200 is slidably set in the slide rails 120.

[0031] The exhaust fan 300 is installed inside the experimental platform 110. Specifically, the exhaust fan 300 is located directly above the operating plane of the experimental platform 110, and its height can be freely set. When the exhaust fan 300 is activated, it is used to exhaust the gas inside the experimental platform 110. The drive mechanism 400 is connected to the viewing window 200. The drive mechanism 400 can be located at the top or bottom of the main cabinet 100, as long as it can drive the viewing window 200 to open normally. When the drive mechanism 400 is activated, it drives the viewing window 200 to open. The system also includes a sensing module 500 and a sensor 510 that is matched with the sensing module 500. The sensing module 500 is electrically connected to the exhaust fan 300 and the drive mechanism 400.

[0032] Specifically, the sensing module 500 is a card reader, and the sensed device 510 is an ID card. The working principle of the card reader and the ID card is mainly based on non-contact sensing technology, the core of which lies in reading and writing information through radio frequency identification (RFID) technology. The card reader sends radio frequency signals of a specific frequency through an antenna. These signals are received by a resonant circuit composed of an inductor and a capacitor inside the ID card. The received signals provide power voltage, a reset signal, and a system clock to the chip inside the ID card, activating the chip. The ID card sends the internally stored information to the card reader through load modulation. After receiving the signal, the card reader demodulates and encodes it, and finally transmits the sensing information to the drive system. The drive system responds to the sensing information. The drive system is an existing drive controller used to start the motor rotation; its specific structure is not described in detail.

[0033] As a further explanation, the sensing module 500 sets the sensing area, such as a circle with a radius of 5 meters centered on the main cabinet 100. The sensing area is within this circle. The sensor 510 is worn by the personnel who need to use the fume hood. If the personnel wearing the sensor 510 enter the sensing area, the sensing module 500 and the sensor 510 respond to each other and transmit a response signal to the drive system. The drive system receives the response signal and closes the circuits of the exhaust fan 300 and the drive mechanism 400. When the circuits are closed, the drive mechanism 400 drives the viewing window 200 to open, so that the personnel can perform experimental operations on the experimental platform 110. At the same time, the exhaust fan 300 is in the open state, exhausting the gas in the experimental platform 110. Similarly, after the staff finishes the experiment and moves away from the main track and beyond the sensing area, the sensing module 500 can no longer sense the sensor 510. The sensing module 500 then sends a response signal again, which is received and responded to by the drive system. This disconnects the circuits of the exhaust fan 300 and the drive mechanism 400, causing the viewing window 200 to close. At the same time, the exhaust fan 300 is in a closed state.

[0034] By installing the sensing module 500 and the sensed module 500 on the fume hood, the viewing window 200 and the exhaust fan 300 of the fume hood will be closed when the staff moves away from the fume hood, reducing dust pollution in the experimental platform 110 and reducing the power consumption of the exhaust fan 300, thus avoiding energy waste. Furthermore, this fume hood is suitable for scenarios where both arms are restricted (such as holding test tubes and recording data at the same time). When the staff approaches the fume hood, the viewing window 200 and the exhaust fan 300 can be opened automatically to avoid interruption of the experimental process.

[0035] For further description, see Figure 3The viewing window 200 has two sets, an upper window and a lower window. The upper window is fixed to the main cabinet 100, and the lower window moves relative to the upper window. The lower window 200 includes a meshing ring 210, a slider 220, a frame 230, and a transparent glass plate 240. The meshing ring 210 is connected to the drive mechanism 400. The slider 220 is slidably disposed within the slide rail 120 and is connected to the meshing ring 210. The frame 230 is disposed on the front side of the experimental platform 110 and is connected to the slider 220. The transparent glass plate 240 is installed within the frame 230. The slider 220 is installed within the slide rail 120, and the slider 220 and the slide rail 120 fit tightly together, allowing the frame 230 and the transparent glass plate 240 to slide smoothly up and down. Experimental phenomena within the experimental platform 110 can be observed through the transparent glass plate 240.

[0036] Further, see Figure 3 and Figure 4 The main cabinet 100 is also provided with a rotating groove 130. The drive mechanism 400 includes a lead screw 410, a reducer 420, and a servo motor 430. The lead screw 410 is vertically arranged in the rotating groove 130 and meshes with the engagement ring 210. The reducer 420 is connected to one end of the lead screw 410, and the servo motor 430 is connected to the reducer 420. When the servo motor 430 rotates, the reducer 420 reduces the speed and drives the lead screw 410 to rotate in the rotating groove 130. Since the engagement ring 210 is sleeved on the lead screw 410, the lead screw 410, by rotating forward or backward, will drive the slider 220 to slide up or down along the slide rail 120, thereby controlling the opening or closing of the viewing window 200.

[0037] Further, see Figure 5 The exhaust fan 300 includes an exhaust pipe 310, a fan 320, a rotating motor 330, and a smoke hood 340. The exhaust pipe 310 is located on the top of the main cabinet 100, and one end of the exhaust pipe 310 extends into the experimental platform 110. The fan 320 is located inside the exhaust pipe 310. The rotating motor 330 is installed on the top of the main cabinet 100 and is connected to the fan 320. The smoke hood 340 is located on the outer wall of the exhaust pipe 310 and is located above the experimental platform 110.

[0038] Furthermore, for some experiments, after the experiment is conducted within the experimental platform 110, if the experiment needs to be carried out slowly, it needs to be left to stand for a longer period of time within the experimental platform 110. In this case, the viewing window 200 is adjusted to a partially closed state, for example, two-thirds of the viewing window 200 is closed and one-third is open, to maintain internal and external pressure balance. Simultaneously, the rotation speed of the exhaust fan 300 needs to be reduced, and part of the air duct needs to be closed, i.e., maintaining normal exhaust by the exhaust fan 300 while also maintaining air duct pressure balance. Therefore, a laboratory fume hood with automatic airflow adjustment also includes an adaptive air duct mechanism 600, see [link to relevant documentation]. Figure 6 and Figure 7 The adaptive air duct mechanism 600 includes a base 610, a gear rail 620, a closing plate 630, and a closing motor 640. The base 610 is mounted on the outer wall of the exhaust pipe 310 and is located inside the smoke collection hood 340. The gear rail 620 is disposed on the base 610 and can rotate in a circular motion on the base 610. The closing plate 630 is disposed inside the gear rail 620 and meshes with the gear rail 620. The closing motor 640 is disposed on the base 610, and the drive end of the closing motor 640 meshes with the gear rail and rotates. The closed state of the viewing window 200, the exhaust state of the exhaust fan 300, and the closed state of the adaptive air duct mechanism 600 are mutually coordinated. For example, when the viewing window 200 is fully open, the exhaust fan 300 has the maximum exhaust volume, and the adaptive air duct mechanism 600 is fully open; when the viewing window 200 is partially open, the exhaust fan 300 has half the exhaust volume, and the adaptive air duct mechanism 600 is partially open. The drive mechanism 400 controls the rotation of the closing motor 640, and the closing motor 640... The drive end of the mechanism drives the gear rail 620 to mesh and rotate, which in turn drives the closing plate 630 to rotate on the base 610. Simultaneously, four sets of gear rails 620 and four sets of closing plates 630 are provided. The four sets of gear rails drive the four sets of closing plates 630 to rotate synchronously. For example, when the gear rail 620 reverses, it drives the closing plate 630 to an open state, and vice versa. When the adaptive air duct mechanism 600 is in a half-open state, the closing motor 640 is controlled to rotate a preset number of times, thereby driving the closing plate 630 to a half-open state. By adjusting the adaptive air duct mechanism 600, the opening state of the air duct can be adaptively adjusted to maintain the air pressure balance of the exhaust pipe. At the same time, when the air duct is completely closed, it can prevent dust from entering the experimental platform 110.

[0039] Specifically, the seat 610 has a through hole, and when the four sets of closing plates 630 are close together, they can close the through hole.

[0040] Furthermore, see Figure 1 For some experiments, the reaction time cannot be accurately controlled, but smoke or gas will be continuously released, making it impossible to shut off the exhaust fan 300 at a set time. Therefore, a laboratory fume hood with automatic airflow adjustment also includes a gas sensor 700. The gas sensor 700 is located above the main cabinet 100, and one end of the gas sensor 700 extends into the experimental platform 110. The gas sensor 700 detects smoke in the experimental platform 110. When smoke is present and personnel are away from the main cabinet 100, the exhaust fan 300 is turned on. When smoke is detected inside the experimental platform 110, the exhaust fan 300 automatically exhausts the smoke, and the viewing window 200 is turned on. When no smoke is detected inside the experimental platform 110, and the sensing module 500 cannot sense the sensor 510, the exhaust fan 300 stops exhausting, and the viewing window 200 is turned off.

[0041] Specifically, the gas sensor 700 can be any one of a semiconductor gas sensor 700, an electrochemical gas sensor 700, or a catalytic combustion gas sensor 700.

[0042] Further, see Figure 2 It also includes a gas filter 800, which is located on the outside of the main cabinet 100 and is connected to the exhaust fan 300. The gas filter 800 is an existing filtration device, such as a coarse filter: TJ-3 type automatic winding flat plate air filter, CW type air filter; a medium-efficiency filter: YB type glass fiber filter, etc.

[0043] Furthermore, the experimental platform 110 is also equipped with a water tank 140 and a placement plate 150. The water tank 140 is used to collect water, and the placement plate 150 is used to place miscellaneous items.

[0044] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A fume hood for laboratory use, in which the air volume is automatically adjusted, characterized in that, The utility model provides a laboratory cabinet, which comprises a main cabinet, an experimental platform arranged in the main cabinet, a visual window, an exhaust device and a driving mechanism arranged on the main cabinet, sliding rails arranged on both sides of the experimental platform, the visual window being slidably arranged in the sliding rails, the exhaust device being arranged in the experimental platform, and the driving mechanism being connected with the visual window. The utility model also comprises an induction module and a sensor matched with the induction module, and the induction module is electrically connected with the exhaust device and the driving mechanism.

2. A fume hood with automatic air volume adjustment for laboratory use according to claim 1, characterized in that, The visual window comprises an engaging ring, a sliding block, a frame and a transparent glass plate, the engaging ring is connected with the driving mechanism, the sliding block is slidably arranged in the sliding rails, the sliding block is connected with the engaging ring, the frame is arranged on the front side of the experimental platform, the frame is connected with the sliding block, and the transparent glass plate is arranged in the frame.

3. A fume hood with automatic air volume control for laboratory use according to claim 2, wherein, A rotating groove is further arranged on the main cabinet, the driving mechanism comprises a lead screw, a speed reducer and a servo motor, the lead screw is vertically arranged in the rotating groove, the lead screw is engaged with the engaging ring, the speed reducer is connected with one end of the lead screw, and the servo motor is connected with the speed reducer.

4. A fume hood with automatic air volume control for laboratory use according to claim 1, wherein, The exhaust device comprises an exhaust pipe, a fan, a rotating motor and a smoke collecting hood, the exhaust pipe is arranged on the top of the main cabinet, one end of the exhaust pipe extends into the experimental platform, the fan is arranged in the exhaust pipe, the rotating motor is arranged on the top of the main cabinet and connected with the fan, and the smoke collecting hood is arranged on the outer wall of the exhaust pipe and located above the experimental platform.

5. A fume hood with automatic air volume control for laboratory use according to claim 4, wherein, The utility model also comprises an adaptive air duct mechanism, the adaptive air duct mechanism comprises a seat, a gear rail, a closing plate and a closing motor, the seat is arranged on the outer wall of the exhaust pipe and located on the inner side of the smoke collecting hood, the gear rail is arranged on the seat and can rotate on the seat, the closing plate is arranged on the inner side of the gear rail and engaged with the gear rail, and the closing motor is arranged on the seat and connected with the gear rail.

6. A fume hood with automatic air volume control for laboratory use according to claim 1, wherein, The utility model also comprises a gas sensor, the gas sensor is arranged above the main cabinet and one end of the gas sensor extends into the experimental platform.

7. A fume hood with automatic air volume control for laboratory use according to claim 1, wherein, The utility model also comprises a gas filter, the gas filter is arranged on the outer side of the main cabinet and connected with the exhaust device.

8. A fume hood with automatic air volume control for laboratory use according to claim 1, wherein, The experimental platform is further provided with a water tank and a placing plate.

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