Internal circulation pipe-free ventilation cabinet

Abstract

The utility model discloses an internal circulation pipe-free ventilation cabinet, and relates to the technical field of ventilation cabinets. Comprising a ventilation cabinet main body, the ventilation cabinet main body is provided with an installation mechanism used for ventilation work, a fan is used for sucking in external gas, then the external gas is filtered and discharged, and the direction is controlled through a guide plate when the gas is discharged; then a gear rod slides on the inner wall of a limiting plate through pushing of a connecting block and an electric push rod, the gear rod drives a transmission gear to rotate, and a supporting shaft on the transmission gear rotates, so that the angle of a guide plate on the outer wall of the supporting shaft is adjusted, the gas exhaust direction is controlled, and the gas exhaust direction can be accurately controlled; the gas is prevented from being directly blown to experimenters or sensitive equipment, the experiment safety is improved, the angle of the guide plate is flexibly adjusted, the gas exhaust direction can be dynamically adjusted according to experiment requirements or environmental conditions, and the applicability of the equipment is improved.

Description

Technical Field

[0001] This utility model relates to the field of fume hood technology, specifically to an internal circulation ductless fume hood. Background Technology

[0002] Fume hoods are a common type of local exhaust ventilation equipment used in laboratories. They completely and promptly remove harmful gases from the work area, preventing operators from inhaling toxic, harmful, and odorous gases, thus providing excellent protection. Fume hoods typically have a work area where operators conduct experiments, and a fan at the top of the fume hood exhausts harmful gases.

[0003] Reference patent (publication number: CN207507955U; publication date: 2018-06-19) discloses a safe and environmentally friendly laboratory fume hood, the main body of which includes a lower cabinet and an upper cabinet located above the lower cabinet. An experimental table is provided on the upper part of the lower cabinet. The upper cabinet is an open cabinet assembled from a back panel, side panels and a top panel. A transparent sliding door is installed at the opening of the upper cabinet. A snap-fit ​​plate is provided below the transparent sliding door. An exhaust duct is installed on the top of the upper cabinet. Hollow columns are installed on both sides of the upper cabinet. Limiters are installed on the hollow columns. The limiters can be embedded in the hollow columns. A baffle is installed above the opening of the upper cabinet located outside the transparent sliding door.

[0004] Based on the aforementioned patent, the fan inside the internal circulation ductless fume hood is activated to draw air from the experimental area into the fume hood. The filtered clean air is then returned to the experimental area by the fan, forming an internal circulation. This avoids the exhaust gas from the ducted fume hood being discharged outdoors through pipes. However, existing equipment lacks precise directional control when exhausting gas, which may cause exhaust gas to blow directly towards experimental personnel or sensitive equipment, affecting experimental safety and operational comfort. Therefore, this utility model provides an internal circulation ductless fume hood. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides an internal circulation ductless fume hood, which solves the problem that existing equipment lacks precise directional control during gas discharge, which may cause exhaust gas to blow directly onto experimental personnel or sensitive equipment, affecting experimental safety and operational comfort.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an internal circulation ductless fume hood, comprising a fume hood body, wherein the fume hood body is provided with an installation mechanism for ventilation operation, the installation mechanism comprising:

[0007] The protective assembly includes a supporting shell fixed to the upper end of the fume hood body, and the upper end of the supporting shell is provided with a mesh frame connected by a snap-fit ​​assembly;

[0008] The guide assembly includes a fixing block fixed to the upper end of the grid frame, a support shaft connected by a gear assembly running through the interior of the fixing block, and a guide plate fixed to the outer wall of the support shaft.

[0009] Preferably, the engaging assembly includes a positioning housing that supports the fixing of the two side walls of the housing, a positioning bracket is inserted inside the positioning housing, the mesh frame is fixedly connected to the upper end of the positioning bracket, and a second bolt is threadedly connected to the side wall of the positioning housing.

[0010] Preferably, the gear assembly includes a limiting plate fixed at the edge of the upper end face of the grid frame, a gear rod slidably connected to the inner wall of the limiting plate, a connecting block fixed to one side wall of the gear rod, a telescopic end of an electric push rod fixed to the inner wall of the connecting block, a base of the electric push rod fixedly connected to the grid frame, a support shaft penetrating and connected inside the fixed block, and a transmission gear fixed to one end of the support shaft near the gear rod, the transmission gear meshing with the gear rod.

[0011] Preferably, inspection plates are attached to both sides of the fume hood body, and the four ends of the inspection plates are provided with first bolts for connecting to the fume hood body. Support legs are provided at the lower end of the fume hood body for support.

[0012] Preferably, a first front window is fixed to the front end of the fume hood body, a second front window is provided at the lower end of the first front window, and a hinge for connecting the first front window and the second front window is provided between them.

[0013] Preferably, a support frame is fixed inside the support housing, a HEPA filter is engaged inside the support frame, a fan is fixed to the upper end of the HEPA filter, an elastic buckle is provided on the front end face of the HEPA filter, and a positioning hole for engaging the elastic buckle is provided on the front end face of the support frame.

[0014] Beneficial effects

[0015] This invention provides a ductless fume hood with internal circulation. Compared with the prior art, it has the following advantages:

[0016] Firstly, the fan in this invention is used to draw in external gas, filter it, and then discharge it. The direction of the discharge is controlled by a guide plate. A gear rod slides on the inner wall of a limiting plate via a connecting block and an electric push rod. The gear rod drives a transmission gear to rotate, causing the support shaft on the transmission gear to rotate. This, in turn, adjusts the angle of the guide plate on the outer wall of the support shaft, controlling the direction of the discharged gas. This precise control of the discharged gas direction prevents the gas from directly blowing onto personnel or sensitive equipment, improving experimental safety. Furthermore, the flexible adjustment of the guide plate angle allows for dynamic adjustment of the gas discharge direction according to experimental needs or environmental conditions, enhancing the applicability of the equipment.

[0017] Secondly, the mesh frame set in this utility model is installed on the top of the fume hood body to protect the operating fan, prevent external objects or personnel from accidentally contacting the fan, and ensure the safe operation of the equipment. The mesh frame is inserted into the positioning shell on both sides of the supporting shell through the positioning bracket, and is locked and disassembled by the second bolt, so that the mesh frame can be quickly locked or disassembled, which is convenient for the maintenance of the fan. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 For the present utility model Figure 1 Enlarged structural diagram at point A in the middle;

[0020] Figure 3 This is a schematic diagram of the internal structure of the supporting shell of this utility model;

[0021] Figure 4 This is a schematic diagram of the HEPA filter installation and connection structure of this utility model;

[0022] Figure 5 For the present utility model Figure 3 Enlarged structural diagram at point B.

[0023] In the diagram: 1. Fume hood body; 2. Support shell; 201. Grid frame; 3. Fixing block; 301. Support shaft; 302. Guide plate; 303. Transmission gear; 304. Limiting plate; 305. Gear rod; 306. Connecting block; 307. Electric push rod; 4. Inspection plate; 401. First bolt; 5. First front window; 501. Hinge; 502. Second front window; 6. Positioning bracket; 601. Positioning shell; 602. Second bolt; 7. Support leg; 8. Support frame; 801. HEPA filter; 802. Fan; 803. Elastic buckle; 804. Positioning hole. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-5 This utility model provides a technical solution: an internal circulation ductless fume hood, including a fume hood body 1, on which an installation mechanism for ventilation operation is provided, the installation mechanism including:

[0026] The protective components include a supporting shell 2 fixed to the upper end of the fume hood body 1, and a mesh frame 201 connected by a snap-fit ​​assembly is provided at the upper end of the supporting shell 2;

[0027] The guide assembly includes a fixing block 3 fixed at the upper end of the space frame 201, a support shaft 301 connected by a gear assembly passing through the interior of the fixing block 3, and a guide plate 302 fixed on the outer wall of the support shaft 301.

[0028] In a preferred embodiment, the locking assembly includes a positioning housing 601 fixed to the two side walls of the supporting housing 2. A positioning bracket 6 is inserted inside the positioning housing 601. The mesh frame 201 is fixedly connected to the upper end of the positioning bracket 6. A second bolt 602 is threadedly connected to the side wall of the positioning housing 601. The mesh frame 201 is installed at the top of the fume hood body 1 to protect the operating fan 802, prevent external objects or personnel from accidentally contacting the fan 802, and ensure the safe operation of the equipment. The mesh frame 201 is inserted into the positioning housing 601 on the two side walls of the supporting housing 2 through the positioning bracket 6, and is locked and disassembled by the second bolt 602, so that the mesh frame 201 can be quickly locked or disassembled, which facilitates the maintenance of the fan 802.

[0029] In a preferred embodiment, the gear assembly includes a limiting plate 304 fixed at the edge of the upper surface of the grid frame 201. A gear rod 305 is slidably connected to the inner wall of the limiting plate 304. A connecting block 306 is fixed to one side wall of the gear rod 305. The telescopic end of an electric push rod 307 is fixed to the inner wall of the connecting block 306. The base of the electric push rod 307 is fixedly connected to the grid frame 201. A support shaft 301 is connected through the inside of the fixed block 301. A transmission gear 303 is fixed to one end of the support shaft 301 near the gear rod 305. The transmission gear 303 is meshed with the gear rod 305. A fan 802 is provided to draw in external air, filter it, and discharge it. During discharge, the air passes through... The guide plate 302 controls the direction, and then the gear rod 305 slides on the inner wall of the limiting plate 304 through the push of the connecting block 306 and the electric push rod 307. The gear rod 305 drives the transmission gear 303 to rotate, thereby rotating the support shaft 301 on the transmission gear 303. This allows for the adjustment of the angle of the guide plate 302 on the outer wall of the support shaft 301, controlling the direction of the discharged gas. This enables precise control of the discharged gas direction, preventing the gas from blowing directly onto the experimental personnel or sensitive equipment, thus improving experimental safety. It also allows for flexible adjustment of the angle of the guide plate 302, enabling dynamic adjustment of the gas discharge direction according to experimental needs or environmental conditions, thereby improving the applicability of the equipment.

[0030] In a preferred embodiment, inspection plates 4 are attached to both sides of the fume hood body 1. The four ends of the inspection plates 4 are provided with first bolts 401 for connecting with the fume hood body 1. The lower end of the fume hood body 1 is provided with support legs 7 for support. The inspection plates 4 are fixed to both sides of the fume hood body 1 by the first bolts 401, which facilitates disassembly and installation, facilitates inspection and maintenance of the internal components of the fume hood, and reduces downtime.

[0031] In a preferred embodiment, a first front window 5 is fixed to the front end of the fume hood body 1, and a second front window 502 is provided at the lower end of the first front window 5. A hinge 501 is provided between the first front window 5 and the second front window 502 for connection. The hinge 501 serves as a connector, allowing the first front window 5 and the second front window 502 to rotate flexibly, facilitating the opening of the second front window 502. When closed, it directly adheres to the front wall of the fume hood.

[0032] In a preferred embodiment, a support frame 8 is fixed inside the support housing 2. A HEPA filter 801 is engaged inside the support frame 8. A fan 802 is fixed to the upper end of the HEPA filter 801. An elastic buckle 803 is provided on the front end face of the HEPA filter 801. A positioning hole 804 for engaging the elastic buckle 803 is provided on the front end face of the support frame 8. The fan 802 draws in air from the fume hood, filters it through the HEPA filter 801, and then discharges it, thus purifying the laboratory air. The HEPA filter 801 filters the air in the fume hood, removing harmful particles, microorganisms, and pollutants, ensuring that the discharged or recirculated air is clean. The engaging connection design of the elastic buckle 803 and the positioning hole 804 ensures that the HEPA filter 801 is securely installed in the support frame 8, preventing it from loosening due to vibration or airflow impact. This also makes installation and disassembly easier and facilitates regular replacement or maintenance. The modular design of the support frame 8 and the HEPA filter 801 facilitates replacement or upgrading according to actual needs, improving the flexibility and adaptability of the equipment.

[0033] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0034] During operation, the fan 802 draws in air from the fume hood, filters it through the HEPA filter 801, and then discharges it, thus purifying the laboratory air. The HEPA filter 801 filters the air in the fume hood, removing harmful particles, microorganisms, and pollutants to ensure that the discharged or recirculated air is clean. The snap-fit ​​design of the elastic buckle 803 and the positioning hole 804 ensures that the HEPA filter 801 is firmly installed in the support frame 8, preventing it from loosening due to vibration or airflow impact. This also makes installation and disassembly easier and facilitates regular replacement or maintenance. The mesh frame 201 is installed on the top of the fume hood body 1 to protect the operating fan 802, preventing external objects or personnel from accidentally contacting the fan 802 and ensuring the safe operation of the equipment.

[0035] The fan 802 is used to draw in external gas, filter it, and then discharge it. The direction of the discharge is controlled by the guide plate 302. The gear rod 305 slides on the inner wall of the limiting plate 304 through the push of the connecting block 306 and the electric push rod 307. The gear rod 305 drives the transmission gear 303 to rotate, causing the support shaft 301 on the transmission gear 303 to rotate. This adjusts the angle of the guide plate 302 on the outer wall of the support shaft 301, controlling the direction of the discharged gas. This allows for precise control of the discharged gas direction, preventing the gas from directly blowing onto experimental personnel or sensitive equipment, improving experimental safety. Furthermore, the flexible adjustment of the guide plate 302 angle allows for dynamic adjustment of the gas discharge direction according to experimental needs or environmental conditions, enhancing the applicability of the equipment.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A ductless fume hood with internal circulation, comprising a fume hood body (1), characterized in that: The fume hood body (1) is provided with an installation mechanism for ventilation operation, the installation mechanism including: The protective component includes a support shell (2) fixed to the upper end of the fume hood body (1), and the upper end of the support shell (2) is provided with a mesh frame (201) connected by a snap-fit ​​assembly; The guide assembly includes a fixing block (3) fixed at the upper end of the grid frame (201), and a support shaft (301) connected by a gear assembly is provided through the interior of the fixing block (3). A guide plate (302) is fixed on the outer wall of the support shaft (301).

2. The ductless fume hood with internal circulation according to claim 1, characterized in that: The engaging assembly includes a positioning housing (601) that supports the two side walls of the housing (2) and is fixed thereon. A positioning bracket (6) is inserted inside the positioning housing (601). The mesh frame (201) is fixedly connected to the upper end of the positioning bracket (6). A second bolt (602) is threadedly connected to the side wall of the positioning housing (601).

3. The ductless fume hood with internal circulation according to claim 1, characterized in that: The gear assembly includes a limiting plate (304) fixed at the edge of the upper surface of the grid frame (201). A gear rod (305) is slidably connected to the inner wall of the limiting plate (304). A connecting block (306) is fixed to one side wall of the gear rod (305). The telescopic end of an electric push rod (307) is fixed to the inner wall of the connecting block (306). The base of the electric push rod (307) is fixedly connected to the grid frame (201). The support shaft (301) is connected through the inside of the fixed block (3). A transmission gear (303) is fixed to one end of the support shaft (301) near the gear rod (305). The transmission gear (303) is meshed with the gear rod (305).

4. The ductless fume hood with internal circulation according to claim 1, characterized in that: The fume hood body (1) has inspection plates (4) attached to both sides. The four ends of the inspection plates (4) are provided with first bolts (401) for connecting with the fume hood body (1). The lower end of the fume hood body (1) is provided with support legs (7) for support.

5. A ductless fume hood with internal circulation according to claim 1, characterized in that: The front end face of the fume hood body (1) is fixed with a first front window (5), and a second front window (502) is provided at the lower end of the first front window (5). A hinge (501) for connecting the first front window (5) and the second front window (502) is provided between them.

6. A ductless fume hood with internal circulation according to claim 1, characterized in that: A support frame (8) is fixed inside the support housing (2). A HEPA filter (801) is engaged inside the support frame (8). A fan (802) is fixed to the upper end of the HEPA filter (801). An elastic buckle (803) is provided on the front end face of the HEPA filter (801). A positioning hole (804) for engaging the elastic buckle (803) is provided on the front end face of the support frame (8).

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