A high-efficiency fume hood

Abstract

This invention relates to the field of fume hood technology, and discloses a high-efficiency, well-ventilated benchtop fume hood. The fume hood includes a cabinet body, a slide rail threaded to the outer side of a first lead screw, the slide rail being slidably connected to the inner top of the cabinet body, and an exhaust hood slidably connected inside the slide rail. The rear side of the exhaust hood is connected to an exhaust duct via a flexible hose, the exhaust duct being fixed to 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 inside the side wall of the cabinet body. This high-efficiency, well-ventilated benchtop fume hood allows adjustment of the exhaust port opening size by retracting the baffle. During the forward movement of the slide rail and exhaust hood, a first toothed plate moves backward under the pull of a connecting rope, and the rotation of the gear drives a second toothed plate and a baffle to move forward. The opening size of the air inlet can be adjusted by adjusting the position of the baffle. This device can adjust the air inlet and exhaust range according to the placement and size of the product, resulting in a more reasonable and efficient exhaust effect.

Description

Technical Field

[0001] This invention relates to the field of fume hood technology, specifically to a high-efficiency, tabletop fume hood. Background Technology

[0002] When conducting experiments on products inside a cabinet, exhaust equipment is needed to remove exhaust gases to prevent them from directly spreading into the air and affecting the environment and human health. The cabinets used for experiments are generally tabletop fume hoods.

[0003] The size of the ventilation openings in existing benchtop fume hoods is generally fixed, and the exhaust range cannot be adjusted according to the placement and size of the product. The exhaust openings are difficult to use effectively, thus affecting the exhaust effect. To address these issues, existing equipment needs to be improved. Summary of the Invention

[0004] The purpose of this invention is to provide a high-efficiency, well-ventilated tabletop fume hood to solve the problems mentioned in the background art, such as the fixed size of the ventilation openings in existing tabletop fume hoods, the inconvenience in adjusting the exhaust range according to the product's placement and size, and the difficulty in making reasonable and effective use of the exhaust openings, thereby affecting the exhaust effect.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-efficiency ventilation tabletop fume hood, comprising a cabinet body, a control panel fixed to 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 inside the top of the cabinet body, the output end of the first motor connected to a first lead screw, a slide rail threaded to the outer side of the first lead screw, the slide rail slidably connected to the inner top of the cabinet body, an exhaust hood slidably connected inside the slide rail, the rear side of the exhaust hood connected to an exhaust duct via a flexible hose, the exhaust duct fixed to the top of the cabinet body, an exhaust port opened on the front side of the exhaust hood, and an air inlet mechanism provided inside the side wall of the cabinet body.

[0006] Preferably, the top of the cabinet has a through hole, and a cabinet door passes through the through hole. The cabinet door is fixed to the cabinet 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 a second lead screw. A vent is threadedly connected to the outer side of the second lead screw, and the vent is slidably connected inside the slide rail.

[0008] Preferably, the inner end face of the exhaust hood is symmetrically fixed with two blocks, and two second sliders are slidably connected inside the exhaust port. Each second slider has a first groove symmetrically opened on both sides. A first spring is fixed in the first groove, and a locking block is fixed to the outer end of the first spring. A slot is opened in the side wall of the exhaust hood, and the locking block is engaged in the slot. Each locking block corresponds to a set of slots, and each set of slots is evenly distributed on the exhaust hood.

[0009] Preferably, a first moving bar is fixed to the rear side of the two second sliders, and a second moving bar is fixed to the front side of the two second sliders. Push blocks are symmetrically fixed to both sides of the front end face 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 passing through the pressing block and connected to two locking blocks.

[0011] Preferably, a storage cylinder is fixed to 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 baffle is fixed to the outer side of the winding rod, and the baffle penetrates the top of the storage cylinder. The baffle passes around the guide cylinder and is connected to the first moving bar.

[0012] Preferably, the air intake mechanism includes a second groove, which is symmetrically fixed inside the two side walls of the cabinet. A first toothed plate is slidably connected inside the second groove, and the rear side of the first toothed plate is connected to the slide rail via a connecting rope.

[0013] Preferably, a gear is rotatably connected in the second groove, and the gear is meshed with the bottom of the first toothed plate. The bottom of the gear is meshed with the second toothed plate, and the second toothed plate is connected to an inner wall of the second groove through a third spring. A limit rod is fixed in the second groove and passes through the second toothed plate. The third spring wraps around the outside of the limit rod, and a baffle is fixed at the bottom of the second toothed plate.

[0014] Preferably, air inlets are symmetrically provided on the two inner walls of the cabinet, the baffle is slidably connected in the air inlets, the top of the cabinet is fixed with an air inlet channel, 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 beneficial effects of the present invention are as follows:

[0016] 1. This high-efficiency tabletop fume hood can efficiently extract waste gas. The interior of the hood can be used for experiments. Before using the device, the height of the hood door can be adjusted according to the user's height. During the experiment, the air inlet draws air into the hood from the side, while the exhaust hood draws the waste gas upwards, preventing the waste gas from directly spreading in the air and affecting the environment and human body.

[0017] 2. This high-efficiency, tabletop fume hood allows for convenient adjustment of the exhaust range. Rotating the first lead screw moves the slide rail back and forth, while rotating the second lead screw moves the exhaust hood up and down, allowing for easy adjustment of the hood's position according to specific needs. Pressing the button unlocks the second slider, enabling the entire assembly of the first, second, and second sliding bars to move the baffle, facilitating its retraction and extension. The baffle obstructs the exhaust vent, and its retraction and extension adjust the vent's opening size. As the slide rail and exhaust hood move forward, the first toothed plate moves backward under the pull of the connecting rope, and the rotating gear moves the second toothed plate and baffle forward. Adjusting the baffle's position adjusts the inlet's opening size. This device allows for adjustment of the air intake and exhaust range based on the product's placement and size, resulting in a more efficient and effective exhaust system.

[0018] 3. This high-efficiency, well-ventilated tabletop fume hood is easy to clean. After unlocking the two second sliders and sliding them to the top, the second moving bar, the two second sliders, and the first moving bar can be pulled down as a whole. The two second sliders leave the exhaust vent, and the first moving bar and the baffle pass through the exhaust vent, making it easy to clean the baffle. Attached Figure Description

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

[0020] Figure 2 This is a frontal three-dimensional structural diagram of the present invention;

[0021] Figure 3 This is a rear-view stereoscopic structural diagram of the present invention;

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

[0023] Figure 5 This is a top view cross-sectional structural diagram of the present invention;

[0024] Figure 6 This is a top sectional view of the connection between the cabinet and the air intake mechanism of the present invention.

[0025] Figure 7 This is a right-side cross-sectional view of the connection between the cabinet and the air intake mechanism of the present invention.

[0026] Figure 8This is a schematic diagram of the ventilation mechanism of the present invention;

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

[0028] Figure 10 This is a bottom-view perspective view of the connection between the exhaust mechanism and the air intake mechanism of the present invention.

[0029] Figure 11 This is a partial three-dimensional structural diagram of the exhaust mechanism of the present invention;

[0030] Figure 12 For the present invention Figure 5 Enlarged structural diagram at point A in the middle;

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

[0032] In the diagram: 1. Cabinet body; 2. Control panel; 3. Cabinet door; 4. Through hole; 5. Fastener; 6. Exhaust mechanism; 601. First motor; 602. First lead screw; 603. Slide rail; 604. Second motor; 605. Second lead screw; 606. Exhaust hood; 607. Exhaust duct; 608. Exhaust vent; 609. Stop block; 610. Second slider; 611. First groove; 612. First spring; 613. Locking block; 614. Slot; 615. First moving bar; 61 6. Second moving bar; 617. Push block; 618. Second spring; 619. Pressing block; 620. Pull rope; 621. Storage tube; 622. Winding rod; 623. Baffle; 624. Guide tube; 7. Air inlet mechanism; 701. Second groove; 702. First toothed plate; 703. Connecting rope; 704. Gear; 705. Second toothed plate; 706. Third spring; 707. Limiting rod; 708. Baffle; 709. Air inlet; 710. Air inlet channel; 711. Fan. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0034] Please see Figures 1 to 13This invention provides a technical solution: a high-efficiency ventilation tabletop fume hood, comprising a cabinet body 1, a control panel 2 fixed to the front side of the cabinet body 1, an exhaust mechanism 6 provided on the inner side of the cabinet body 1, the exhaust mechanism 6 including a first motor 601, the first motor 601 fixed inside the top of the cabinet body 1, the output end of the first motor 601 connected to a first lead screw 602, a slide rail 603 threadedly connected to the outer side of the first lead screw 602, the slide rail 603 slidably connected to the inner top of the cabinet body 1, an exhaust hood 606 slidably connected inside the slide rail 603, the rear side of the exhaust hood 606 connected to an exhaust duct 607 via a flexible hose, the exhaust duct 607 fixed to the top of the cabinet body 1, an exhaust port 608 opened on the front side of the exhaust hood 606, and an air inlet mechanism 7 provided inside the side wall of the cabinet body 1.

[0035] In this embodiment, as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a through hole 4 is provided on the top of the cabinet 1, and a cabinet door 3 passes through the through hole 4. The cabinet door 3 is fixed to the cabinet 1 by fasteners 5. After loosening the fasteners 5, the cabinet door 3 can be moved up and down to adjust the usable area of ​​the cabinet door 3 according to the needs. Then, the fasteners 5 can be tightened to fix the cabinet door 3.

[0036] In this embodiment, as 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 a second lead screw 605. A fume hood 606 is threadedly connected to the outer side of the second lead screw 605, and the fume hood 606 is slidably connected inside the slide rail 603. The second lead screw 605 can rotate under the action of the second motor 604. At this time, the fume hood 606 can slide up or down under the limiting action of the slide rail 603 and the second lead screw 605, so as to facilitate the adjustment of the height of the fume hood 606 according to the size of the product.

[0037] In this embodiment, as Figure 4 , Figure 5 , Figure 8 , Figure 10 , Figure 11 , Figure 12 and Figure 13As shown, symmetrical blocks 609 are fixed on both sides of the inner end face of the exhaust hood 606. Two second sliders 610 are slidably connected inside the exhaust port 608. Each second slider 610 has a first groove 611 symmetrically opened on both sides. A first spring 612 is fixed in the first groove 611, and a locking block 613 is fixed to the outer end of the first spring 612. A slot 614 is opened in the side wall of the exhaust hood 606. The locking block 613 is engaged in the slot 614. Each locking block 613 corresponds to a set of slots 614, and each set of slots 614 is evenly distributed on the exhaust hood 606. The first spring 612 supports the locking block 613. The locking block 613 initially locks the second slider 610. After unlocking the second slider 610, the second slider 610 can slide inside the exhaust port 608.

[0038] In this embodiment, as 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 face of the first moving bar 615. After unlocking the second sliders 610, the push blocks 617 can be held to move the second moving bar 616, and the first moving bar 615 and the two second sliders 610 will move accordingly. When the first moving bar 615 moves to the bottom, the stop block 609 blocks the first moving bar 615. Since the top of the exhaust vent 608 is long and open, 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 for easy cleaning of the relevant components.

[0039] In this embodiment, as 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 via 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 under the pulling action of the pull rope 620 and leaves the slot 614, which facilitates unlocking the second slider 610. Then, 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 the pressing block 619 is released, the locking block 613 automatically pops open under the action of the second spring 618 and locks into the corresponding slot 614, which facilitates relocking the second slider 610.

[0040] In this embodiment, as 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 winding rod 622 is rotatably connected inside the storage cylinder 621. The winding rod 622 is connected to the storage cylinder 621 via a spiral spring. A guide cylinder 624 is rotatably connected to the inner side of the exhaust hood 606, and a baffle 623 is fixed to the outer side of the winding rod 622. The baffle 623 penetrates the top of the storage cylinder 621, passes around the guide cylinder 624, and is connected to the first moving bar 615. By lowering the first moving bar 615... 5. When the second slider 610 and the second moving bar 616 pull the cover 623, the winding rod 622 rotates to release the cover 623. When the first moving bar 615, the second slider 610 and the second moving bar 616 move upward, the winding rod 622 automatically rotates under the action of the spiral spring, which facilitates the winding of the cover 623. The storage cylinder 621 plays a role in storing the cover 623. During the winding and unwinding of the storage cylinder 621, the guide cylinder 624 rotates, which facilitates the top support and guidance.

[0041] In this embodiment, as 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 toothed plate 702 is slidably connected in the second groove 701, and the rear side of the first toothed plate 702 is connected to the slide rail 603 through a connecting rope 703. When the slide rail 603 moves forward, the first toothed plate 702 can move backward under the pulling action of the connecting rope 703.

[0042] In this embodiment, as Figure 6 and Figure 7 As shown, a gear 704 is rotatably connected within the second groove 701, and the gear 704 is meshed with the bottom of the first toothed plate 702. The bottom of the gear 704 is meshed with a second toothed plate 705, and the second toothed plate 705 is connected to an inner wall of the second groove 701 via a third spring 706. A limiting rod 707 is fixed within the second groove 701 and passes through the second toothed plate 705. The third spring 706 wraps around the outside of the limiting rod 707. A baffle 708 is fixed to the bottom of the second toothed plate 705. When the first toothed plate 702 moves backward, the gear 704 rotates, causing the second toothed plate 705 to move forward. The limiting rod 707 limits the movement of the second toothed plate 705, and the third spring 706 assists the second toothed plate 705 in resetting.

[0043] In this embodiment, as 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. A baffle 708 is slidably connected inside 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. A fan 711 is fixed inside the top of the air inlet channel 710. External air can enter the air inlet channel 710 under the operation of the fan 711. The second toothed plate 705 can move back and forth to drive the baffle 708 to move back and forth. The baffle 708 plays a role in blocking the air inlet 709, which makes it convenient to adjust the opening size of the air inlet 709 according to the placement position and size of the product.

[0044] The method of use and advantages of this invention: The working process of this high-efficiency, well-ventilated benchtop fume hood is as follows:

[0045] like Figures 1 to 13 As shown: Connect the exhaust duct 607 to an external air extraction device and connect it to an external power source. The interior of cabinet 1 can be used for experiments. The operation of the entire device is controlled by the control panel 2. Before conducting the experiment, adjust the height of the cabinet door 3 according to your height, and then tighten the fasteners 5 to secure the cabinet door 3. Rotating the first lead screw 602 can drive the slide rail 603 to slide back and forth, and rotating the second lead screw 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 items. At position 606, when the pressing block 619 is pressed, the locking block 613 moves and disengages from the slot 614 under the pulling action of the pull rope 620, thereby unlocking the second slider 610. Then, by holding the push block 617, the second slider 610, the first moving bar 615, and the second moving bar 616 can be moved as a whole. With the help of the retracting rod 622 and the spiral spring, the baffle 623 can be flexibly extended and retracted, making it convenient to adjust the opening size of the exhaust vent 608 according to specific needs. After releasing the pressing block 619, the locking block 613 automatically pops open and locks in place. In the corresponding slot 614, the second slider 610 is locked. When the slide rail 603 moves forward, the first toothed plate 702 moves backward under the pull of the connecting rope 703, thereby driving the gear 704 to rotate. The second toothed plate 705 moves forward, driving the baffle 708 to move forward, thereby blocking part of the air inlet 709. The further the exhaust hood 606 moves forward, the more the baffle 708 blocks the air inlet 709. During the experiment, the fan 711 runs, and the air inlet 709 blows air from the side into the cabinet. Air enters the body 1, and exhaust fumes are drawn upwards through the exhaust vent 608. The exhaust fumes are eventually 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 detach from the exhaust vent 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 vent 608, and then the baffle 623 can be cleaned.

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

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

[0048] The terms “center,” “longitudinal,” “lateral,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship 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 device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention.

[0049] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope 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 to the front of the cabinet (1). An exhaust mechanism (6) is provided on the inner side of the cabinet (1). The exhaust mechanism (6) includes a first motor (601). The first motor (601) is fixed inside the top of the cabinet (1). The output end of the first motor (601) is connected to a first lead screw (602). A slide rail (603) is threaded onto the outer side of the first lead screw (602). 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). The rear side of the exhaust hood (606) is connected to an exhaust pipe (607) via a flexible hose. The exhaust duct (607) is fixed to the top of the cabinet (1). An exhaust port (608) is provided on the front side of the exhaust hood (606). Baffles (609) are symmetrically fixed on both sides of the inner end face of the exhaust hood (606). Two second sliders (610) are slidably connected inside the exhaust port (608), and each second slider (610) has a first groove (611) symmetrically provided on both sides. A first spring (612) is fixed inside the first groove (611), and a locking block (613) is fixed to the outer end of the first spring (612). A slot (614) is provided inside the side wall of the exhaust hood (606), and the locking block (613) is engaged with the slot. Within the slot (614), each locking block (613) corresponds to a set of slots (614), and each set of slots (614) is evenly distributed on the exhaust hood (606). A first moving strip (615) is fixed to the rear side of the two second sliders (610), and a second moving strip (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 face of the first moving strip (615). The top of the push block (617) is connected to the pressing block (619) through 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 connected to two locking blocks (613), the inner side of the exhaust hood (606) is fixed with a storage tube (621), and a winding rod (622) is rotatably connected inside the storage tube (621). The winding rod (622) is connected to the storage tube (621) through a spiral spring. The inner side of the exhaust hood (606) is rotatably connected with a guide tube (624). The outer side of the winding rod (622) is fixed with a baffle (623), and the baffle (623) penetrates the top of the storage tube (621). The baffle (623) passes around the guide tube (624) and is connected to the first moving bar (615). An air inlet mechanism (7) is provided inside the side wall of the cabinet (1).

2. The tabletop fume hood with high-efficiency airflow according to claim 1, characterized in that: The top of the cabinet (1) has a through hole (4), and a cabinet door (3) passes through the through hole (4). The cabinet door (3) is fixed to the cabinet (1) by fasteners (5).

3. The tabletop fume hood with high-efficiency airflow according to claim 1, characterized in that: The bottom of the slide rail (603) is fixed with a second motor (604), and the top of the second motor (604) is connected to a second lead screw (605). The outer side of the second lead screw (605) is threaded with an exhaust hood (606), and the exhaust hood (606) is slidably connected inside the slide rail (603).

4. The tabletop fume hood with high-efficiency airflow according to claim 1, characterized in that: 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 toothed plate (702) is slidably connected in the second groove (701), and the rear side of the first toothed plate (702) is connected to the slide rail (603) through a connecting rope (703).

5. A high-efficiency ventilation tabletop fume hood according to claim 4, characterized in that: A gear (704) is rotatably connected inside the second groove (701), and the gear (704) is meshed with the bottom of the first toothed plate (702). The bottom of the gear (704) is meshed with the second toothed plate (705), and the second toothed plate (705) is connected to an inner wall of the second groove (701) through a third spring (706). A limiting rod (707) is fixed inside the second groove (701), and the limiting rod (707) passes through the second toothed plate (705). The third spring (706) is wrapped around the outside of the limiting rod (707). A baffle (708) is fixed at the bottom of the second toothed plate (705).

6. A high-efficiency ventilation tabletop fume hood according to claim 5, characterized in that: The cabinet (1) has symmetrical air inlets (709) on its two inner walls. The baffle (708) is slidably connected in the air inlet (709). The top of the cabinet (1) is fixed with an air inlet channel (710), and the air inlet channel (710) is connected to the top of the air inlet (709). A fan (711) is fixed in the top of the air inlet channel (710).

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