Exhaust mechanism for fume hood

Abstract

The utility model discloses an exhaust mechanism for a ventilation cabinet, which relates to the technical field of ventilation cabinets, comprises a ventilation cabinet body, and is characterized in that the ventilation cabinet body consists of a ventilation upper body and an experiment cabinet body, and the ventilation upper body consists of an operation cavity, an experiment table top, an access hole, a power socket and a push-pull window. Through the synergistic effect of three-stage flow guide structures of the wind stabilizing plate, the second-stage flow guide plate and the spoiler, stable airflow distribution is formed, the wind stabilizing plate is obliquely installed to guide airflow to flow upwards, the second-stage flow guide plate is connected with the wind stabilizing plate and further restrains an airflow path, and the spoiler is located on the lower portion so that turbulence of an operation opening can be reduced. Through cooperation of the three parts, the gas leakage rate during window opening is remarkably reduced, the waste gas capturing efficiency is improved, harmful gas leakage is effectively restrained through a multi-layer flow guide structure, the laboratory environment is prevented from being polluted by experimental waste gas, meanwhile, the risk that operators inhale toxic gas is reduced, and the health and safety of experimenters are guaranteed.

Description

Technical Field

[0001] This utility model relates to the technical field of fume hoods, specifically an exhaust mechanism for fume hoods. Background Technology

[0002] Cabinet-type exhaust hoods, commonly known as fume hoods, are similar to enclosed hoods. Small parts spray painting cabinets and chemical laboratory fume hoods are typical examples of cabinet-type exhaust hood structures. Large chamber-type fume hoods have one side completely open, allowing operators to work inside; they are mainly used for painting large parts and bagging powder materials. The working opening of the fume hood significantly affects the airflow distribution within, which in turn directly impacts the effectiveness of the cabinet-type exhaust hood.

[0003] Fume hoods are used to capture, contain, and remove waste gases and harmful gases, creating a safe working environment and preventing users from inhaling waste gases or harmful gases that could endanger their lives or health. Fume hoods consist of an upper cabinet and a lower cabinet. The upper cabinet is used for experimental operations, while the lower cabinet stores reagents, etc. An exhaust fan is installed above the workbench in the upper cabinet to remove waste gases generated during experiments. Currently, the leakage rate of the baffle plate when the viewing window is open is relatively high, which not only pollutes the laboratory environment but also endangers the safety of operators. Utility Model Content

[0004] To solve the above problems, that is, to address the issues raised in the background art, this utility model proposes an exhaust mechanism for a fume hood, which includes a fume hood body, characterized in that: the fume hood body is composed of a ventilation upper body and an experimental cabinet body, and the ventilation upper body is composed of an operating cavity, an experimental table surface, an inspection port, a power socket, and a sliding window;

[0005] A wind-fixing plate is installed in the upper part of the operating cavity, and the wind-fixing plate is placed in the operating cavity at three inclinations by a set of brackets;

[0006] A secondary guide plate is installed on one side of the operating chamber. The secondary guide plate is placed in the operating chamber by a set of brackets. The upper part of the secondary guide plate is connected to the lower end of the wind-stabilizing plate.

[0007] A baffle is installed on one side of the operating cavity. The baffle is placed in the operating cavity by a set of brackets. The baffle is located below the secondary guide plate. The top of the baffle is located between the secondary guide plate and the inner wall of the operating cavity. The bottom of the baffle is slightly higher than the experimental platform.

[0008] A further feature of this invention is that the wind deflector, the secondary guide plate, and the baffle plate are all made of HPL (High-Pressure Laminate) board, which has the characteristics of corrosion resistance, high temperature resistance, and high mechanical strength. It is suitable for harsh environments such as chemical experiments, extending the service life of the equipment and reducing maintenance costs.

[0009] A further feature of this invention is that the top of the operating chamber is provided with an exhaust port, which is connected to the top of the housing of the ventilation upper body, and an exhaust fan unit (a common prior art, not shown in the figure) is installed inside the housing of the ventilation upper body.

[0010] The beneficial technical effects of this utility model are as follows: This utility model forms a stable airflow distribution through the synergistic effect of a three-stage airflow guiding structure consisting of a fixed air plate, a secondary guide plate, and a baffle plate. The fixed air plate is installed at an angle to guide the airflow upward, the secondary guide plate connects to the fixed air plate and further constrains the airflow path, and the baffle plate located below can reduce turbulence at the operating port. The three components work together to significantly reduce the gas leakage rate when the viewing window is open and improve the waste gas capture efficiency. The multi-layer airflow guiding structure effectively inhibits the leakage of harmful gases and reduces energy consumption (traditional exhaust volume is 2000 h / m³, now it is 1300 h / m³), saving energy and reducing emissions. It also has low requirements for the fan, avoids laboratory waste gas pollution, and reduces the risk of operators inhaling toxic gases, thus protecting the health and safety of laboratory personnel. Attached Figure Description

[0011] Figure 1 The front view of this utility model is shown.

[0012] Figure 2 A side view of the present invention is shown.

[0013] Figure 3 The side view and top view of this utility model are shown.

[0014] Figure 4 A partial three-dimensional structural schematic diagram of this utility model is shown.

[0015] The attached diagram includes the following labels: 1. Air duct, 2. Secondary air deflector, 3. Baffle, 4. Support 1, 5. Support 2, 6. Fume hood body, 7. Inspection port, 8. Support 3, 9. Exhaust port. Detailed Implementation

[0016] The following is a reference to the appendix. Figures 1-4 The preferred embodiments of this utility model are described below. Those skilled in the art should understand that these embodiments are merely for explaining the technical principles of this utility model and are not intended to limit the scope of protection of this utility model.

[0017] This invention proposes an exhaust mechanism for a fume hood. When the fume hood is in operation, the exhaust mechanism is activated. The air-stabilizing plate 1 guides the airflow in the operating chamber upward, reducing turbulence. The secondary guide plate 2 further constrains the airflow, guiding its direction and directing it along a predetermined path to the exhaust port 9. This ensures that harmful gases of different heights and specific gravities can be discharged, thereby maximizing the limitation of pollution escape. The baffle plate 3 helps to ensure that harmful gases inside the fume hood body 6 are effectively diluted, suppressing turbulence near the operating port, and enabling the airflow to pass evenly through the opening and sliding door plane of the fume hood body 6. This eliminates blind spots and prevents harmful substances from overflowing from the fume hood body 6. Finally, the exhaust gas is discharged through the exhaust port 9, ensuring a safe experimental environment. The combination of these three factors significantly reduces the gas leakage rate when the window is open, improves the exhaust gas capture efficiency, and the multi-layer flow guiding structure effectively suppresses the leakage of harmful gases (the leakage rate is reduced by more than 30% compared to traditional fume hoods), reduces energy consumption (traditional exhaust volume is 2000 h / m³, now it is 1300 h / m³), saves energy and reduces emissions, has low requirements for fans, avoids experimental exhaust gas from polluting the laboratory environment, and at the same time reduces the risk of operators inhaling toxic gases, ensuring the health and safety of experimental personnel.

[0018] Although the present invention has been described with reference to preferred embodiments, various modifications can be made to it and components can be replaced with equivalents without departing from the scope of the present invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0019] In the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0022] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. An exhaust mechanism for a fume hood, comprising a fume hood body (6), characterized in that: The fume hood body (6) is composed of a ventilation upper body and an experimental cabinet body. The ventilation upper body is composed of an operating cavity, an experimental table, an inspection port (7), a power socket, and a sliding window. A wind-fixing plate (1) is installed in the upper part of the operating cavity. The wind-fixing plate (1) is inclinedly placed in the operating cavity by a set of brackets (8). A secondary guide plate (2) is installed on one side of the operating cavity. The secondary guide plate (2) is placed in the operating cavity by a set of brackets (4). The upper part of the secondary guide plate (2) is connected to the lower end of the wind-stabilizing plate (1). A baffle plate (3) is installed on one side of the operating cavity. The baffle plate (3) is placed in the operating cavity by a set of brackets (5). The baffle plate (3) is located below the secondary guide plate (2). The top of the baffle plate (3) is located between the secondary guide plate (2) and the inner wall of the operating cavity. The bottom of the baffle plate (3) is higher than the experimental platform.

2. The exhaust mechanism for a fume hood according to claim 1, wherein: The wind deflector (1), the secondary guide plate (2) and the turbulence deflector (3) are all made of HPL (High-Pressure Laminate) board.

3. The exhaust mechanism for a fume hood according to claim 1, wherein: The top of the operating chamber is provided with an exhaust vent (9).

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