Efficient circulating table type ventilation cabinet

Abstract

The invention relates to the technical field of ventilation cabinets, and discloses an efficient circulation table type ventilation cabinet which comprises a cabinet body, the outer side of a first lead screw is in threaded connection with a sliding rail, the sliding rail is slidably connected to the inner top of the cabinet body, a draught hood is slidably connected into the sliding rail, and the rear side of the draught hood is connected with an exhaust pipeline through a hose. The exhaust pipeline is fixed to the top of the cabinet body, a suction opening is formed in the front side of the draught hood, and an air inlet mechanism is arranged in the side wall of the cabinet body. According to the efficient circulating table type ventilation cabinet, the opening degree of an air suction opening can be adjusted by folding and unfolding a blocking cover, in the forward moving process of a sliding rail and the air suction cover, a first toothed plate moves backwards under the pulling effect of a connecting rope, a gear rotates to drive a second toothed plate and a baffle to move forwards, and the opening degree of an air inlet can be adjusted by adjusting the position of the baffle; according to the device, the air inlet and exhaust range can be adjusted according to the placing position and size of a product, so that the exhaust effect is more reasonable and efficient.

Description

Technical Field

[0001] The invention relates to the technical field of fume hoods, in particular to a desktop fume hood with high-efficiency circulation. Background Art

[0002] When conducting experiments on products in a cabinet, exhaust equipment is needed to remove the exhaust gas to prevent it from directly spreading in the air and affecting the environment and human health. The cabinet used for the experiment is generally a desktop fume hood.

[0003] The size of the ventilation openings of existing desktop fume hoods is generally fixed, and the exhaust range is inconvenient to adjust according to the placement and size of the product. The exhaust openings are difficult to be used reasonably and effectively, thus affecting the exhaust effect. In view of the above problems, it is necessary to improve the existing equipment. Summary of the Invention

[0004] The object of the present invention is to provide a desktop fume hood with high-efficiency circulation, so as to solve the problem raised in the above-mentioned background technology that the size of the ventilation openings of the existing desktop fume hoods is generally fixed, the exhaust range is inconvenient to adjust according to the placement and size of the product, and the exhaust openings are difficult to be reasonably and effectively utilized, thereby affecting the exhaust effect.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a desktop fume hood with high-efficiency circulation, comprising a cabinet body, a control panel fixed on the front side of the cabinet body, an exhaust mechanism provided on the inner side of the cabinet body, the exhaust mechanism comprising a first motor, the first motor fixed in the top of the cabinet body, the output end of the first motor connected to a first screw rod, the outer side of the first screw rod is threadedly connected to a slide rail, the slide rail is slidably connected to the inner top of the cabinet body, an exhaust hood is slidably connected in the slide rail, the rear side of the exhaust hood is connected to an exhaust duct through a hose, the exhaust duct is fixed on the top of the cabinet body, an exhaust port is provided on the front side of the exhaust hood, and an air inlet mechanism is provided in the side wall of the cabinet body.

[0006] Preferably, a through hole is provided on the top of the cabinet body, and a cabinet door passes through the through hole, and the cabinet door is fixed to the cabinet body by fasteners.

[0007] Preferably, a second motor is fixed to the bottom of the slide rail, and the top of the second motor is connected to the second screw rod, the outer side of the second screw rod is threadedly connected to the exhaust hood, and the exhaust hood is slidably connected to the slide rail.

[0008] Preferably, blocks are symmetrically fixed on both sides of the inner end surface of the exhaust hood, two second sliders are slidably connected in the exhaust port, and first grooves are symmetrically provided on both sides of each second slider, a first spring is fixed in the first groove, and a locking block is fixed to the outer end of the first spring, a card slot is provided in the side wall of the exhaust hood, the locking block is snap-connected in the card slot, and each locking block corresponds to a group of card slots, and each group of card slots is evenly spaced on the exhaust hood.

[0009] Preferably, a first moving bar is fixed to the rear sides of the two second sliding blocks, and a second moving bar is fixed to the front sides of the two second sliding blocks, and push blocks are symmetrically fixed on both sides of the front end surface of the first moving bar.

[0010] Preferably, the top of the push block is connected to the pressing block via a second spring, and a pull rope is fixed inside the push block, the pull rope passes through the pressing block and is connected to the two locking blocks.

[0011] Preferably, a storage cylinder is fixed on the inner side of the exhaust hood, and a winding rod is rotatably connected inside the storage cylinder. The winding rod is connected to the storage cylinder through a spiral spring. A guide cylinder is rotatably connected to the inner side of the exhaust hood. A blocking cover is fixed on the outer side of the winding rod, and the blocking cover passes through the top of the storage cylinder. The blocking cover bypasses the guide cylinder and is connected to the first movable bar.

[0012] Preferably, the air inlet mechanism includes a second groove, and the second groove is symmetrically fixed in the two side walls of the cabinet, a first tooth plate is slidably connected in the second groove, and the rear side of the first tooth plate is connected to the slide rail through a connecting rope.

[0013] Preferably, a gear is rotatably connected in the second groove, and the gear is meshedly connected to the bottom of the first tooth plate, the bottom of the gear is meshedly connected to the second tooth plate, and the second tooth plate is connected to an inner wall of the second groove through a third spring, a limiting rod is fixed in the second groove, and the limiting rod passes through the second tooth plate, the third spring is wrapped around the outside of the limiting rod, and a baffle is fixed to the bottom of the second tooth plate.

[0014] Preferably, air inlets are symmetrically provided on the two inner walls of the cabinet, the baffle is slidably connected in the air inlet, an air inlet channel is fixed on the top of the cabinet, and the air inlet channel is connected to the top of the air inlet, and a fan is fixed in the top of the air inlet channel.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. This high-efficiency desktop fume hood can achieve the purpose of efficient exhaust gas extraction. The interior of the cabinet can be used for experiments. Before using the device, the height of the cabinet door can be adjusted according to the user's height. During the experiment, the air inlet intakes air from the side into the cabinet, and the exhaust hood can draw the exhaust gas upward to prevent the exhaust gas from directly spreading in the air and affecting the environment and human body.

[0017] 2. This high-efficiency circulation desktop fume hood can achieve the purpose of conveniently adjusting the exhaust range. The rotation of the first screw can drive the slide rail to move forward and backward, and the rotation of the second screw can drive the exhaust hood to move up and down, so that the position of the exhaust hood can be adjusted according to specific needs. After pressing the press block to unlock the second slider, the first moving bar, the second slider and the second moving bar can be moved as a whole, which is convenient for retracting and extending the shield. The shield has a shielding effect on the exhaust port, and the opening size of the exhaust port can be adjusted by retracting and extending the shield. During the forward movement of the slide rail and the exhaust hood, the first tooth plate moves backward under the pulling action of the connecting rope, and the rotation of the gear drives the second tooth plate and the baffle to move forward. The opening size of the air inlet can be adjusted by adjusting the position of the baffle. The device can adjust the air inlet and exhaust range according to the placement and size of the product, making the exhaust effect more reasonable and efficient.

[0018] 3. This high-efficiency circulation desktop fume hood can achieve the purpose of easy cleaning. After unlocking the two second sliders and sliding them to the top, the second movable bar, the two second sliders and the first movable bar can be pulled down as a whole. The two second sliders leave the exhaust port, and the first movable bar and the shield pass through the exhaust port, making it easy to clean the shield. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a 3D physical image of the present invention;

[0020] Figure 2 It is a schematic diagram of the front three-dimensional structure of the present invention;

[0021] Figure 3 It is a rear perspective structural diagram of the present invention;

[0022] Figure 4 It is a right side cross-sectional structural schematic diagram of the present invention;

[0023] Figure 5 It is a schematic diagram of a top cross-sectional structure of the present invention;

[0024] Figure 6 This is a schematic diagram of a top-view cross-sectional structure of the connection between the cabinet body and the air inlet mechanism of the present invention;

[0025] Figure 7 This is a schematic diagram of the right side cross-sectional structure of the connection between the cabinet body and the air inlet mechanism of the present invention;

[0026] Figure 8It is a schematic structural diagram of the exhaust mechanism of the present invention;

[0027] Figure 9 This is a right-side perspective structural diagram of the connection between the exhaust mechanism and the air inlet mechanism of the present invention;

[0028] Figure 10 This is a bottom-up perspective structural diagram of the connection between the exhaust mechanism and the air inlet mechanism of the present invention;

[0029] Figure 11 It is a schematic diagram of the partial three-dimensional structure of the exhaust mechanism of the present invention;

[0030] Figure 12 For the present invention Figure 5 A in the middle is an enlarged structural diagram;

[0031] Figure 13 For the present invention Figure 8 Enlarged structural diagram at point B in the middle.

[0032] In the figure: 1, cabinet body; 2, control panel; 3, cabinet door; 4, through hole; 5, fastener; 6, exhaust mechanism; 601, first motor; 602, first screw rod; 603, slide rail; 604, second motor; 605, second screw rod; 606, exhaust cover; 607, exhaust duct; 608, exhaust port; 609, stopper; 610, second slider; 611, first groove; 612, first spring; 613, lock block; 614, slot; 615, first moving bar; 616 6. Second moving bar; 617. Push block; 618. Second spring; 619. Pressing block; 620. Pull rope; 621. Storage cylinder; 622. Winding rod; 623. Shield; 624. Guide cylinder; 7. Air inlet mechanism; 701. Second groove; 702. First tooth plate; 703. Connecting rope; 704. Gear; 705. Second tooth plate; 706. Third spring; 707. Limiting rod; 708. Baffle; 709. Air inlet; 710. Air inlet channel; 711. Fan. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] See also Figures 1 to 13The present invention provides a technical solution: a desktop fume hood with high efficiency circulation, comprising a cabinet body 1, a control panel 2 being fixed to the front side of the cabinet body 1, an exhaust mechanism 6 being provided on the inner side of the cabinet body 1, the exhaust mechanism 6 comprising a first motor 601, the first motor 601 being fixed inside the top of the cabinet body 1, the output end of the first motor 601 being connected to a first screw rod 602, the outer side of the first screw rod 602 being threadedly connected to a slide rail 603, the slide rail 603 being slidably connected to the inner top of the cabinet body 1, an exhaust hood 606 being slidably connected inside the slide rail 603, the rear side of the exhaust hood 606 being connected to an exhaust duct 607 through a hose, the exhaust duct 607 being fixed to the top of the cabinet body 1, an exhaust port 608 being provided on the front side of the exhaust hood 606, and an air inlet mechanism 7 being provided in the side wall of the cabinet body 1.

[0035] In this embodiment, Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, a through hole 4 is provided on the top of the cabinet body 1, and a cabinet door 3 passes through the through hole 4. The cabinet door 3 is fixed to the cabinet body 1 by a fastener 5. After loosening the fastener 5, the cabinet door 3 can be moved up and down, which is convenient for adjusting the usable area of ​​the cabinet door 3 according to needs, and then the fastener 5 can be tightened to fix the cabinet door 3.

[0036] In this embodiment, Figure 4 、 Figure 5 、 Figure 8 、 Figure 9 and Figure 10 As shown, a second motor 604 is fixed to the bottom of the slide rail 603, and the top of the second motor 604 is connected to the second screw rod 605. The outer side of the second screw rod 605 is threadedly connected to the exhaust hood 606, and the exhaust hood 606 is slidably connected to the slide rail 603. The second screw rod 605 can rotate under the action of the second motor 604. At this time, the exhaust hood 606 can slide up or down under the limiting action of the slide rail 603 and the second screw rod 605, so that the height of the exhaust hood 606 can be adjusted according to the size of the product.

[0037] In this embodiment, Figure 4 、 Figure 5 、 Figure 8 、 Figure 10 、 Figure 11 、 Figure 12 and Figure 13As shown, blocks 609 are symmetrically fixed on both sides of the inner end surface of the exhaust hood 606, and two second sliders 610 are slidably connected in the exhaust port 608, and first grooves 611 are symmetrically provided on both sides of each second slider 610, a first spring 612 is fixed in the first groove 611, and a locking block 613 is fixed at the outer end of the first spring 612, and a card slot 614 is provided in the side wall of the exhaust hood 606, and the locking block 613 is engaged and connected in the card slot 614, and each locking block 613 corresponds to a group of card slots 614, and each group of card slots 614 is evenly spaced on the exhaust hood 606, and the first spring 612 supports the locking block 613, and the locking block 613 initially locks the second slider 610. After unlocking the second slider 610, the second slider 610 can slide in the exhaust port 608.

[0038] In this embodiment, Figure 4 、 Figure 5 、 Figure 8 、 Figure 10 、 Figure 11 、 Figure 12 and Figure 13 As shown, a first moving bar 615 is fixed to the rear side of the two second sliders 610, and a second moving bar 616 is fixed to the front side of the two second sliders 610. Push blocks 617 are symmetrically fixed on both sides of the front end surface of the first moving bar 615. After unlocking the second sliders 610, the push blocks 617 can be held by hand to move the second moving bar 616, and the first moving bar 615 and the two second sliders 610 move accordingly. When the first moving bar 615 moves to the bottom, the block 609 blocks the first moving bar 615. Since the top of the exhaust port 608 is in a long open shape, after sliding the two second sliders 610 to the top, the second moving bar 616, the two second sliders 610 and the first moving bar 615 can be pulled down as a whole to facilitate cleaning of related components.

[0039] In this embodiment, Figure 4 、 Figure 5 、 Figure 8 、 Figure 10 、 Figure 12 and Figure 13 As shown, the top of the push block 617 is connected to the pressing block 619 through the second spring 618, and a pull rope 620 is fixed inside the push block 617. The pull rope 620 passes through the pressing block 619 and is connected to the two locking blocks 613. When the pressing block 619 is pressed, the locking block 613 moves and leaves the card slot 614 under the pulling action of the pull rope 620, which is convenient for unlocking the second slider 610. After that, the push block 617 can be held by hand to move the first moving bar 615, the second slider 610 and the second moving bar 616 as a whole. After releasing the pressing block 619, the locking block 613 automatically pops open and is stuck in the corresponding card slot 614 under the action of the second spring 618, which is convenient for re-locking the second slider 610.

[0040] In this embodiment, Figure 4 、 Figure 8 and Figure 11 As shown, a storage cylinder 621 is fixed to the inner side of the exhaust hood 606, and a reeling rod 622 is rotatably connected to the storage cylinder 621. The reeling rod 622 is connected to the storage cylinder 621 through a spiral spring. The inner side of the exhaust hood 606 is rotatably connected to a guide cylinder 624. A blocking cover 623 is fixed to the outer side of the reeling rod 622, and the blocking cover 623 passes through the top of the storage cylinder 621. The blocking cover 623 bypasses the guide cylinder 624 and is connected to the first moving bar 615. By moving the first moving bar 615 downward, the 5. When the second slider 610 and the second movable bar 616 pull the blocking cover 623, the winding rod 622 rotates to release the blocking cover 623. When the first movable bar 615, the second slider 610 and the second movable bar 616 are moved upward, the winding rod 622 automatically rotates under the action of the spiral spring, making it convenient to roll up the blocking cover 623. The storage cylinder 621 plays a role of storing the blocking cover 623. In the process of retracting and releasing the storage cylinder 621, the guide cylinder 624 rotates to facilitate the support and guidance.

[0041] In this embodiment, Figure 6 、 Figure 7 、 Figure 9 and Figure 10 As shown, the air intake mechanism 7 includes a second groove 701, and the second groove 701 is symmetrically fixed in the two side walls of the cabinet 1. A first tooth plate 702 is slidably connected in the second groove 701, and the rear side of the first tooth plate 702 is connected to the slide rail 603 through a connecting rope 703. When the slide rail 603 moves forward, the first tooth plate 702 can move backward under the pulling action of the connecting rope 703.

[0042] In this embodiment, Figure 6 and Figure 7 As shown, a gear 704 is rotatably connected in the second groove 701, and the gear 704 is meshed with the bottom of the first tooth plate 702. The bottom of the gear 704 is meshed with the second tooth plate 705, and the second tooth plate 705 is connected to an inner wall of the second groove 701 through a third spring 706. A limiting rod 707 is fixed in the second groove 701, and the limiting rod 707 passes through the second tooth plate 705. The third spring 706 is wrapped around the outside of the limiting rod 707. A baffle 708 is fixed to the bottom of the second tooth plate 705. When the first tooth plate 702 moves backward, the gear 704 rotates to drive the second tooth plate 705 to move forward. The limiting rod 707 limits the second tooth plate 705, and the third spring 706 can assist the second tooth plate 705 to reset.

[0043] In this embodiment, Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown, air inlets 709 are symmetrically provided on the two inner walls of the cabinet 1, and the baffle 708 is slidably connected in the air inlet 709. An air inlet channel 710 is fixed on the top of the cabinet 1, and the air inlet channel 710 is communicated with the top of the air inlet 709. A fan 711 is fixed in the top of the air inlet channel 710, and external air can enter the air inlet channel 710 under the operation of the fan 711. The second tooth plate 705 moves forward and backward to drive the baffle 708 to move forward and backward, and the baffle 708 plays a shielding role on the air inlet 709, which makes it convenient to adjust the opening size of the air inlet 709 according to the placement and size of the product.

[0044] The use method and advantages of the present invention: The working process of the high-efficiency circulation desktop fume hood is as follows:

[0045] like Figures 1 to 13 As shown: Connect the exhaust duct 607 to the external exhaust equipment and connect it to the external power supply. The interior of the cabinet 1 can be used for experiments. The operation of the entire device can be controlled by operating the control panel 2. Before doing the experiment, adjust the height of the cabinet door 3 according to your personal height, then tighten the fastener 5 to press the cabinet door 3. The rotation of the first screw rod 602 can drive the slide rail 603 to slide back and forth, and the rotation of the second screw rod 605 can drive the exhaust hood 606 to slide up and down, making it convenient to adjust the exhaust hood according to the placement and size of the experimental objects. 606, when the pressing block 619 is pressed, the locking block 613 moves under the pulling action of the pull rope 620 and leaves the card slot 614, thereby unlocking the second slider 610, and then the pushing block 617 is held by the hand to move the second slider 610, the first moving bar 615 and the second moving bar 616 as a whole, and the winding rod 622 and the scroll spring are used to flexibly retract and expand the shield 623, so that the opening size of the exhaust port 608 can be adjusted according to specific needs. After releasing the pressing block 619, the locking block 613 automatically pops open and is locked. The second slider 610 is locked in the corresponding slot 614. When the slide rail 603 moves forward, the first tooth plate 702 moves backward under the pulling action of the connecting rope 703, thereby driving the gear 704 to rotate. The second tooth plate 705 moves forward and drives the baffle 708 to move forward, thereby blocking a part of the air inlet 709. The more the exhaust hood 606 moves forward, the more the baffle 708 blocks the air inlet 709. During the experiment, the fan 711 is running, and the air inlet 709 is directed from the side to the cabinet. Air enters the body 1, and the exhaust port 608 draws the exhaust gas upward, and the exhaust gas is finally discharged through the exhaust duct 607. After unlocking the two second sliders 610 and sliding the second moving bar 616, the two second sliders 610 and the first moving bar 615 to the top, the two second sliders 610 can be separated from the exhaust port 608. When the second moving bar 616, the two second sliders 610 and the first moving bar 615 are pulled down as a whole, the first moving bar 615 passes through the exhaust port 608, and then the shield 623 can be cleaned.

[0046] In summary, this high-efficiency circulation desktop fume hood achieves the purpose of efficient exhaust gas extraction, convenient adjustment of exhaust range and convenient cleaning, meeting people's usage needs.

[0047] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

[0048] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the protection content of the present invention.

[0049] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-efficiency ventilation tabletop fume hood, comprising a cabinet body (1), characterized in that: A control panel (2) is fixed on the front side of the cabinet (1), and an exhaust mechanism (6) is provided on the inner side of the cabinet (1). The exhaust mechanism (6) includes a first motor (601), which is fixed inside the top of the cabinet (1), and the output end of the first motor (601) is connected to a first screw rod (602). The outer side of the first screw rod (602) is threadedly connected to a slide rail (603), and the slide rail (603) is slidably connected to the inner top of the cabinet (1). An exhaust hood (606) is slidably connected inside the slide rail (603), and the rear side of the exhaust hood (606) is connected to an exhaust duct (607) through a hose. The exhaust duct (607) is fixed on the top of the cabinet (1), and an exhaust port (608) is provided on the front side of the exhaust hood (606). An air inlet mechanism (7) is provided in the side wall of the cabinet (1).

2. The high-efficiency ventilation desktop fume hood according to claim 1, characterized in that: A through hole (4) is provided on the top of the cabinet body (1), and a cabinet door (3) passes through the through hole (4). The cabinet door (3) is fixed to the cabinet body (1) via a fastener (5).

3. The high-efficiency ventilation desktop fume hood according to claim 1, characterized in that: A second motor (604) is fixed to the bottom of the slide rail (603), and the top of the second motor (604) is connected to a second screw rod (605). The outer side of the second screw rod (605) is threadedly connected to an exhaust hood (606), and the exhaust hood (606) is slidably connected to the slide rail (603).

4. The high-efficiency ventilation desktop fume hood according to claim 1, characterized in that: Stoppers (609) are symmetrically fixed on both sides of the inner end surface of the exhaust hood (606), two second sliders (610) are slidably connected in the exhaust port (608), and first grooves (611) are symmetrically provided on both sides of each second slider (610), a first spring (612) is fixed in the first groove (611), and a locking block (613) is fixed at the outer end of the first spring (612), a card slot (614) is provided in the side wall of the exhaust hood (606), and the locking block (613) is snap-connected in the card slot (614), and each locking block (613) corresponds to a group of card slots (614), and each group of card slots (614) is evenly spaced on the exhaust hood (606).

5. The high-efficiency ventilation desktop fume hood according to claim 4, characterized in that: A first moving bar (615) is fixed to the rear side of the two second sliders (610), and a second moving bar (616) is fixed to the front side of the two second sliders (610), and push blocks (617) are symmetrically fixed on both sides of the front end surface of the first moving bar (615).

6. The high-efficiency ventilation desktop fume hood according to claim 5, characterized in that: The top of the push block (617) is connected to the pressing block (619) via a second spring (618), and a pull rope (620) is fixed inside the push block (617). The pull rope (620) passes through the pressing block (619) and is connected to the two locking blocks (613).

7. The high-efficiency ventilation desktop fume hood according to claim 5, characterized in that: A storage cylinder (621) is fixed on the inner side of the exhaust hood (606), and a winding rod (622) is rotatably connected inside the storage cylinder (621). The winding rod (622) is connected to the storage cylinder (621) through a spiral spring. A guide cylinder (624) is rotatably connected to the inner side of the exhaust hood (606). A blocking cover (623) is fixed on the outer side of the winding rod (622), and the blocking cover (623) passes through the top of the storage cylinder (621). The blocking cover (623) bypasses the guide cylinder (624) and is connected to the first movable bar (615).

8. The high-efficiency ventilation desktop fume hood according to claim 1, characterized in that: The air inlet mechanism (7) includes a second groove (701), and the second groove (701) is symmetrically fixed in the two side walls of the cabinet (1); a first tooth plate (702) is slidably connected in the second groove (701), and the rear side of the first tooth plate (702) is connected to the slide rail (603) through a connecting rope (703).

9. The high-efficiency ventilation desktop fume hood according to claim 8, characterized in that: A gear (704) is rotatably connected in the second groove (701), and the gear (704) is meshedly connected to the bottom of the first tooth plate (702). The bottom of the gear (704) is meshedly connected to the second tooth plate (705), and the second tooth plate (705) is connected to an inner wall of the second groove (701) through a third spring (706). A limiting rod (707) is fixed in the second groove (701), and the limiting rod (707) passes through the second tooth plate (705). The third spring (706) is wrapped around the outer side of the limiting rod (707). A baffle (708) is fixed to the bottom of the second tooth plate (705).

10. The high-efficiency ventilation desktop fume hood according to claim 9, characterized in that: Air inlets (709) are symmetrically provided on the two inner walls of the cabinet (1), the baffle (708) is slidably connected in the air inlet (709), an air inlet channel (710) is fixed on the top of the cabinet (1), and the air inlet channel (710) is connected to the top of the air inlet (709), and a fan (711) is fixed in the top of the air inlet channel (710).

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