A laboratory ventilation device

Abstract

The utility model relates to a laboratory ventilation device belongs to laboratory ventilation technical field. This laboratory ventilation device, include: ventilation cabinet body, ventilation cabinet body top fixed intercommunication has the exhaust pipe, be provided with the air intake mechanism in ventilation cabinet body, be used for the position of ventilation cabinet body different height ventilation, wherein, the air intake mechanism includes the telescopic air pipe fixed mounting in the air intake of ventilation cabinet body, telescopic air pipe one end fixed intercommunication has the collection cover, still include reset mechanism, set up in the inside of ventilation cabinet body, be used for the reset of telescopic air pipe, set up telescopic air pipe, pull down telescopic air pipe, change the position of the air draft, the position of ventilation cabinet body different is ventilated, improve the efficiency of ventilation, can choose the position of ventilation according to the different of experiment, all harmful gas is extracted.

Description

Technical Field

[0001] This utility model relates to the field of laboratory ventilation technology, and in particular to a laboratory ventilation device. Background Technology

[0002] During chemical experiments in the laboratory, a lot of odorous gases are generated, which deteriorates the air quality inside the laboratory. Generally, ventilation devices are installed to replace indoor and outdoor air and ensure air circulation in the laboratory.

[0003] Currently, a Chinese patent discloses a laboratory fume hood (authorization announcement number CN209379619U). This utility model includes a cabinet body with an exhaust channel at the top. The cabinet body has a door with tempered glass on its surface. An interior workbench is provided, with a fixing block on its surface. The purification mechanism of this utility model effectively purifies gases, preventing toxic and harmful gases from being directly emitted into the air and polluting the environment. A fan draws in toxic and harmful gases generated during experiments, which are then filtered through an activated carbon adsorption mesh and a filter to remove impurities before being discharged through the exhaust channel. The electric hydraulic telescopic rod and sliding plate automatically clean the workbench, preventing operators from being harmed by toxic reagents and improving safety. Wastewater after cleaning is disinfected by an ultraviolet disinfection lamp, preventing direct discharge and water source pollution. However, in practical use, the above method has the following drawbacks: the fan is fixed in position and far from the interior of the cabinet, making it impossible to exhaust all the gases inside, resulting in low ventilation efficiency. Utility Model Content

[0004] Therefore, it is necessary to provide a laboratory ventilation device to address the problem that the fan is fixed in position and far from the inside of the cabinet, making it impossible to exhaust all the gas inside the cabinet.

[0005] A laboratory ventilation device includes: a fume hood body, an exhaust duct fixedly connected to the top of the fume hood body, and an air suction mechanism disposed inside the fume hood body for ventilating different height positions of the fume hood body; wherein the air suction mechanism includes a telescopic duct fixedly installed at the air inlet of the fume hood body, one end of the telescopic duct being fixedly connected to a collection hood; and a reset mechanism disposed inside the fume hood body for resetting the telescopic duct.

[0006] In one embodiment, the telescopic duct is located in the center of the fume hood body, and the collection hood has a trapezoidal vertical cross-section.

[0007] In one embodiment, the reset mechanism includes an installation cavity opened inside the fume hood body, a take-up roller is rotatably connected inside the installation cavity, a pull wire is wound around the take-up roller, one end of the pull wire is fixedly connected to the top of the collection cover, and a torsion spring is fixedly connected to one end of the take-up roller, and the torsion spring is fixedly connected to the inner wall of the installation cavity.

[0008] In one embodiment, a baffle is rotatably connected to the bottom of the mounting cavity, and the baffle has a through hole corresponding to the diameter of the pull wire;

[0009] In one embodiment, a ratchet is fixedly connected to one end of the take-up roller, a pawl corresponding to the ratchet is rotatably connected to the inner wall of the mounting cavity, and an electromagnet is provided on the inner wall of the mounting cavity above the pawl;

[0010] In one embodiment, the through hole is located directly above the collection cover, allowing the pull wire to move vertically upwards, and a rotating rod corresponding to the pull wire is rotatably connected inside the mounting cavity;

[0011] In one embodiment, two pull wires are provided, and the two pull wires are symmetrically arranged about the telescopic duct;

[0012] In one embodiment, the inner wall of the telescopic duct is provided with an anti-corrosion layer.

[0013] Beneficial effects

[0014] A telescopic duct is installed. Pulling the telescopic duct downwards changes the exhaust position, allowing ventilation to be applied to different locations on the fume hood, thus improving ventilation efficiency. The ventilation position can be selected according to different experiments to extract all harmful gases.

[0015] A reset mechanism is provided. After ventilation is completed, the winding roller rotates in the opposite direction under the action of the torsion spring to wind up the pull line, thereby resetting the telescopic duct for easy use next time. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the reset mechanism of this utility model;

[0019] Figure 3 This is a schematic diagram of the mounting cavity of this utility model;

[0020] Figure 4 This is an enlarged schematic diagram of the structure at point A of this utility model.

[0021] Figure label:

[0022] 100. Fume hood body; 110. Exhaust duct; 200. Suction mechanism; 210. Telescopic duct; 211. Collection cover; 220. Baffle; 221. Take-up roller; 222. Pull cable; 223. Torsion spring; 224. Mounting cavity; 231. Ratchet; 232. Pawl; 233. Electromagnet. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this specification are for illustrative purposes only and do not represent the only possible implementation.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this specification belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0028] The following is combined Figures 1-4 This invention describes a laboratory ventilation device.

[0029] In one embodiment, a laboratory ventilation device includes: a fume hood body 100, an exhaust duct 110 fixedly connected to the top of the fume hood body 100, and an air suction mechanism 200 disposed inside the fume hood body 100 for ventilating different height positions of the fume hood body 100; wherein, the air suction mechanism 200 includes a telescopic duct 210 fixedly installed at the air inlet of the fume hood body 100, one end of the telescopic duct 210 being fixedly connected to a collection cover 211; and also includes a reset mechanism disposed inside the fume hood body 100 for resetting the telescopic duct 210.

[0030] like Figure 1 As shown, the telescopic duct 210 is located in the center of the fume hood body 100, and the collection cover 211 has a trapezoidal vertical cross-section.

[0031] In this embodiment, a fan inside the fume hood body 100 draws air in through the telescopic duct 210 and exhausts it through the exhaust duct 110, thereby preventing harmful gases from harming the experimental personnel. A collection hood 211 is provided to concentrate the air, making it easier to extract. Since the telescopic duct 210 is extendable, its length can be adjusted as needed to position the collection hood 211 at a suitable height, effectively extracting harmful gases and preventing the collection hood 211 from being too far from the experimental area, which would result in poor ventilation.

[0032] like Figure 2 and Figure 3As shown, the reset mechanism includes an installation cavity 224 opened inside the fume hood body 100. A take-up roller 221 is rotatably connected inside the installation cavity 224. A pull wire 222 is wound around the take-up roller 221. One end of the pull wire 222 is fixedly connected to the top of the collection cover 211. A torsion spring 223 is fixedly connected to one end of the take-up roller 221. The torsion spring 223 is fixedly connected to the inner wall of the installation cavity 224.

[0033] In this embodiment, when the collection cover 211 is pulled, the pull line 222 will move, thereby causing the take-up roller 221 to rotate and the torsion spring 223 to be twisted. When the collection cover 211 is released, under the action of the torsion spring 223, the take-up roller 221 will rotate in the opposite direction and wind the pull line 222, thereby causing the telescopic air duct 210 to return to its original position.

[0034] like Figure 2 and Figure 3 As shown, a baffle 220 is rotatably connected to the bottom of the mounting cavity 224, and a through hole corresponding to the diameter of the pull wire 222 is provided on the baffle 220.

[0035] In this embodiment, the mounting cavity 224 is blocked by the baffle 220, and a through hole is provided to facilitate the passage of the pull wire 222. The diameter of the through hole is larger than the diameter of the pull wire 222 to avoid wear on the pull wire 222.

[0036] like Figure 2 and Figure 4 As shown, a ratchet 231 is fixedly connected to one end of the take-up roller 221, and a pawl 232 corresponding to the ratchet 231 is rotatably connected to the inner wall of the mounting cavity 224. An electromagnet 233 is provided on the inner wall of the mounting cavity 224 above the pawl 232.

[0037] In this embodiment, when the collection cover 211 is pulled down, the take-up roller 221 drives the ratchet 231 to rotate. Under the action of the pawl 232, the take-up roller 221 cannot rotate in the opposite direction. At this time, releasing the collection cover 211 will not cause the pull line 222 to retract, which facilitates the positioning of the collection cover 211. When the electromagnet 233 is energized, the electromagnet 233 generates magnetic force, which attracts the pawl 232, thereby disengaging the pawl 232 from the ratchet 231. Under the action of the torsion spring 223, the take-up roller 221 can wind up the pull line 222, causing the collection cover 211 to return to its original position.

[0038] like Figure 2 and Figure 3 As shown, the through hole is located directly above the collection cover 211, allowing the pull wire 222 to move vertically upwards, and a rotating rod corresponding to the pull wire 222 is rotatably connected inside the mounting cavity 224.

[0039] In this embodiment, a rotating rod is provided to reverse the direction of the pull wire 222, so that the pull wire 222 can move horizontally and vertically, thereby reducing wear on the pull wire 222.

[0040] like Figure 2 As shown, there are two pull wires 222, and the two pull wires 222 are symmetrically arranged about the telescopic air duct 210.

[0041] In this embodiment, the symmetrically arranged pull wires 222 can keep the telescopic duct 210 centered when it is reset, and when the two pull wires 222 extend at different distances, the collection cover 211 can be at an inclined angle to ventilate at a specific angle.

[0042] like Figure 1 As shown, the inner wall of the telescopic duct 210 is provided with an anti-corrosion layer.

[0043] In this embodiment, an anti-corrosion layer is provided on the inner wall to prevent corrosion by harmful gases and extend its service life. The telescopic duct 210 is a polyurethane duct with a PVC coating on the inner wall, which combines flexibility and chemical resistance.

[0044] Working principle:

[0045] When conducting experiments on the platform of the fume hood body 100, depending on the experiment, the collection hood 211 is pulled down to align it with the location where harmful gases are generated. The fan inside the fume hood body 100 is then activated, drawing the harmful gases from the collection hood 211 and expelling them through the exhaust pipe 110, thus preventing injury to the experimenters. After the experiment, the electromagnet 233 is energized, attracting the pawl 232 under magnetic force, disengaging it from the ratchet 231. The torsion spring 223 then rotates the take-up roller 221, winding up the pull cord 222. The winding of the two pull cords 222 resets the telescopic duct 210 and the collection hood 211.

[0046] It should be noted that the telescopic duct 210, collection cover 211, take-up roller 221, torsion spring 223 and electromagnet 233 mentioned above are all devices with relatively mature existing technology. The specific model can be selected according to actual needs. Electromagnet 233 is powered by an external power supply, which will not be elaborated here.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A laboratory ventilation device, characterized in that, include: The fume hood body (100) has an exhaust pipe (110) fixedly connected to its top, and a suction mechanism (200) is provided inside the fume hood body (100) for ventilating different height positions of the fume hood body (100). The suction mechanism (200) includes a telescopic duct (210) fixedly installed at the air inlet of the fume hood body (100), and one end of the telescopic duct (210) is fixedly connected to a collection cover (211). It also includes a reset mechanism, which is located inside the fume hood body (100) and is used to reset the telescopic duct (210); The reset mechanism includes an installation cavity (224) opened inside the fume hood body (100). A take-up roller (221) is rotatably connected inside the installation cavity (224). A pull wire (222) is wound around the take-up roller (221). One end of the pull wire (222) is fixedly connected to the top of the collection cover (211). A torsion spring (223) is fixedly connected to one end of the take-up roller (221). The torsion spring (223) is fixedly connected to the inner wall of the installation cavity (224). One end of the take-up roller (221) is fixedly connected to a ratchet (231), and the inner wall of the mounting cavity (224) is rotatably connected to a pawl (232) corresponding to the ratchet (231). An electromagnet (233) is provided on the inner wall of the mounting cavity (224) above the pawl (232).

2. The laboratory ventilation device according to claim 1, characterized in that, The telescopic duct (210) is located in the center of the fume hood body (100), and the collection cover (211) has a trapezoidal vertical cross-section.

3. The laboratory ventilation device according to claim 2, characterized in that, The bottom of the mounting cavity (224) is rotatably connected to a baffle (220), and the baffle (220) has a through hole corresponding to the diameter of the pull wire (222).

4. The laboratory ventilation device according to claim 3, characterized in that, The through hole is located directly above the collection cover (211), allowing the pull wire (222) to move vertically upwards, and a rotating rod corresponding to the pull wire (222) is rotatably connected inside the mounting cavity (224).

5. The laboratory ventilation device according to claim 4, characterized in that, Two pull wires (222) are provided, and the two pull wires (222) are symmetrically arranged about the telescopic air duct (210).

6. The laboratory ventilation device according to claim 1, characterized in that, The inner wall of the telescopic duct (210) is provided with an anti-corrosion layer.

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