Pipeline-free ventilation cabinet

Abstract

The utility model discloses a pipeline-free ventilation cabinet which comprises a cabinet body, an air collecting cover is arranged at the top of the cabinet body, a waste gas treatment device is arranged at the top of the air collecting cover, when the waste gas treatment device operates, harmful waste gas generated in the cabinet body is sucked through the air collecting cover, and a first flow guide plate, a second flow guide plate and a third flow guide plate are sequentially fixed in the cabinet body from top to bottom. The upper end of the first flow guide plate inclines towards the front side of the air outlet, a first gap is formed between the upper end of the first flow guide plate and the top of the cabinet body, the second flow guide plate and the third flow guide plate are vertically arranged and are close to the back side plate, and the lower end of the first flow guide plate is aligned with the upper end of the second flow guide plate and a second gap is formed between the first flow guide plate and the second flow guide plate; the lower end of the second guide plate is aligned with the upper end of the third guide plate, and a third gap is formed therebetween; and a fourth gap is formed between the lower end of the third guide plate and the bottom of the cabinet body. Waste gas close to the middle part and the bottom part in the cabinet can be fully discharged, so that the waste gas purification efficiency is improved.

Description

Technical Field

[0001] This utility model relates to a laboratory fume hood, and more particularly to a ductless fume hood. Background Technology

[0002] Laboratory fume hoods are used in experimental environments to purify harmful waste gases generated during experiments involving various organic and some inorganic reagents. Existing purification methods include using filter assemblies, which are installed at the top of the fume hood between pre-set fans. These filter assemblies can be composed of HEPA filters, formaldehyde filters, VOCs filters, etc. When the fans draw in air, the harmful waste gases are discharged through the vents at the top of the fume hood. As the harmful waste gases pass through the filter assemblies, the harmful particles are adsorbed, thus achieving purification. However, this type of fume hood can only quickly draw out the harmful waste gases near the top of the fume hood. Some particles in the harmful waste gases will settle downwards, making it difficult to treat the waste gases near the middle and bottom of the fume hood in a timely manner, resulting in poor purification effect. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a ductless ventilation cabinet that can fully exhaust the exhaust gas near the middle and bottom of the cabinet, thereby improving the exhaust gas purification efficiency, in order to address the shortcomings of the existing technology.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0005] A ductless fume hood includes a cabinet body and a door located on the front side of the cabinet body. A collection hood is located on the top of the cabinet body, and a waste gas treatment device is located on the top of the collection hood. The lower opening of the collection hood connects to an air outlet on the top of the cabinet body. The air outlet is close to the back panel of the cabinet body. When the waste gas treatment device operates, harmful waste gas generated inside the cabinet body is drawn in through the collection hood. A first guide plate, a second guide plate, and a third guide plate are fixed sequentially from top to bottom inside the cabinet body. The upper end of the first guide plate is inclined towards the front of the air outlet, and a first gap is formed between the upper end of the first guide plate and the top of the cabinet body. The second and third guide plates are vertically arranged and both are close to the back panel. The lower end of the first guide plate is aligned with the upper end of the second guide plate, and a second gap is formed between them. The lower end of the second guide plate is aligned with the upper end of the third guide plate, and a third gap is formed between them. A fourth gap is formed between the lower end of the third guide plate and the bottom of the cabinet body.

[0006] Preferably, the top opening area of ​​the air collecting hood is smaller than the bottom opening area, and the bottom opening edge of the air collecting hood is sealed to the edge of the air outlet.

[0007] Preferably, the air outlet is a rectangular opening.

[0008] Preferably, the top of the cabinet is provided with a surrounding panel, and the air collection hood and the exhaust gas treatment device are both located inside the surrounding panel.

[0009] Preferably, the cabinet door is provided with a frame on both sides of the doorway, and the cabinet door is located between the two frames.

[0010] Preferably, a controller is provided inside the enclosure, and a touch screen is provided on the front side of the enclosure. The exhaust gas treatment device and the touch screen are electrically connected to the controller.

[0011] In the ductless fume hood disclosed in this utility model, the air collecting hood installed at the top of the cabinet is used to draw out the exhaust gas inside the cabinet. When the exhaust gas treatment device is operating, harmful exhaust gas enters the exhaust gas treatment device through the air collecting hood, is purified by the exhaust gas treatment device, and is then further discharged. A first guide plate, a second guide plate, and a third guide plate are fixedly installed inside the cabinet. The first guide plate is installed obliquely, while the second and third guide plates are installed vertically. Driven by the suction force generated by the exhaust gas treatment device, the exhaust gas near the middle and lower parts of the cabinet can be drawn away through the third gap and the fourth gap. The exhaust gas is transported upward in the gap between the back panel and the second and third guide plates. At the same time, the exhaust gas near the middle and upper parts of the cabinet can be drawn away through the first gap and the second gap. The above structure can not only fully purify the exhaust gas near the middle and lower parts of the cabinet, but also improve the collection efficiency of the exhaust gas inside the cabinet based on the oblique installation of the first guide plate, and avoid occupying too much space inside the cabinet. Compared with existing technologies, this invention not only meets experimental requirements but also effectively exhausts the exhaust gas near the middle and bottom of the cabinet, thereby improving the exhaust gas purification efficiency. Attached Figure Description

[0012] Figure 1 This is a perspective view of the ductless fume hood of this utility model;

[0013] Figure 2 This is an exploded view of the ductless fume hood of this utility model;

[0014] Figure 3 A 3D view of the cabinet;

[0015] Figure 4 This is a top view of the cabinet;

[0016] Figure 5 for Figure 4 A cross-sectional view along line AA. Detailed Implementation

[0017] The present invention will now be described in more detail with reference to the accompanying drawings and embodiments.

[0018] This utility model discloses a ductless fume hood, combined with Figures 1 to 5 As shown, it includes a cabinet 1 and a cabinet door 2 located on the front side of the cabinet 1. A dust collector 3 is provided on the top of the cabinet 1, and a waste gas treatment device 4 is provided on the top of the dust collector 3. The lower opening of the dust collector 3 connects to an air outlet 10 on the top of the cabinet 1. The air outlet 10 is close to the back panel 12 of the cabinet 1. When the waste gas treatment device 4 operates, it draws in harmful waste gas generated inside the cabinet 1 through the dust collector 3. Inside the cabinet 1, a first guide plate 400, a second guide plate 5, and a third guide plate 6 are fixed sequentially from top to bottom. The first guide plate 400... The upper end is inclined towards the front of the air outlet 10, and a first gap 7 is formed between the upper end of the first guide plate 400 and the top of the cabinet 1. The second guide plate 5 and the third guide plate 6 are vertically arranged and both are close to the back panel 12. The lower end of the first guide plate 400 is aligned with the upper end of the second guide plate 5 and there is a second gap 8 between them. The lower end of the second guide plate 5 is aligned with the upper end of the third guide plate 6 and there is a third gap 9 between them. There is a fourth gap 13 between the lower end of the third guide plate 6 and the bottom of the cabinet 1.

[0019] In the above structure, the air collecting hood 3 installed on the top of the cabinet 1 is used to draw out the exhaust gas inside the cabinet. When the exhaust gas treatment device 4 is operating, the harmful exhaust gas enters the exhaust gas treatment device 4 through the air collecting hood 3, is purified by the exhaust gas treatment device 4, and is then further discharged. A first guide plate 400, a second guide plate 5, and a third guide plate 6 are fixedly installed inside the cabinet 1. The first guide plate 400 is installed obliquely, while the second guide plate 5 and the third guide plate 6 are installed vertically. Driven by the suction force generated by the exhaust gas treatment device 4, the cabinet 1... The exhaust gas near the middle and lower parts of the cabinet can be drawn away through the third gap 9 and the fourth gap 13. The exhaust gas is then transported upwards within the gap between the back panel 12 and the second and third guide plates 5 and 6. Simultaneously, the exhaust gas near the middle and upper parts of the cabinet 1 can be drawn away through the first gap 7 and the second gap 8. This structure not only effectively purifies the exhaust gas near the middle and lower parts of the cabinet 1, but also, based on the oblique installation of the first guide plate 400, improves the collection efficiency of the exhaust gas inside the cabinet and avoids occupying too much space inside the cabinet. Compared with the prior art, this invention not only meets the experimental requirements but also effectively discharges the exhaust gas near the middle and bottom of the cabinet, thereby improving the exhaust gas purification efficiency.

[0020] Furthermore, the top opening area of ​​the air collecting hood 3 is smaller than the bottom opening area, and the bottom opening edge of the air collecting hood 3 is sealed to the edge of the air outlet 10. Preferably, the air collecting hood 3 is a trapezoidal hood, which is designed to collect more exhaust gas.

[0021] In order to better match the air collecting cover 3, in this embodiment, the air outlet 10 is a rectangular opening.

[0022] Please see Figure 1 and Figure 2 In this embodiment, the top of the cabinet 1 is provided with a surrounding panel 14, and the air collecting hood 3 and the exhaust gas treatment device 4 are both located within the surrounding panel 14. By providing the surrounding panel 14, this embodiment can more effectively conceal the air collecting hood 3 and the exhaust gas treatment device 4.

[0023] In this embodiment, regarding the design of the baffle, the baffle is installed inside the fume hood. Through aerodynamic simulation, the back and lower positions are controlled at a distance of 60mm and 80mm respectively. This ensures that the face velocity of the fume hood is 0.3m / s, while achieving a tracer gas leakage rate of 0ppm, thereby preventing accidents.

[0024] As a preferred embodiment, the cabinet 1 has side frames 15 on both sides of the doorway, and the cabinet door 2 is located between the two side frames 15.

[0025] To facilitate human-computer interaction, in this embodiment, a controller is provided inside the enclosure 14, and a touch screen 150 is provided on the front side of the enclosure 14. The exhaust gas treatment device 4 and the touch screen 150 are electrically connected to the controller. For the above structure, please refer to... Figure 2 The exhaust gas treatment device 4 includes a microwave resonant cavity 40, an electrodeless ultraviolet lamp 41 disposed in the microwave resonant cavity 40, and a vortex fan unit 42 disposed at the top of the microwave resonant cavity 40. The mesh 43 densely arranged at the bottom of the microwave resonant cavity 40 is connected to the top of the air collection hood 3. After the harmful exhaust gas generated during the experiment enters the microwave resonant cavity, it is decomposed into pollution-free gas based on the synergistic effect of microwave field, 185nm short-wave ultraviolet light, hydroxyl groups, carboxyl groups and trace ozone. The gas is then discharged after meeting the standards. Based on the fume hood of this utility model, it can effectively avoid harm to scientific research and experimental personnel.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. All modifications, equivalent substitutions or improvements made within the technical scope of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. A ductless fume hood, characterized in that, The cabinet includes a cabinet body (1) and a cabinet door (2) located on the front side of the cabinet body (1). The top of the cabinet body (1) is provided with a dust collector (3), and the top of the dust collector (3) is provided with a waste gas treatment device (4). The lower opening of the dust collector (3) is connected to the air outlet (10) on the top of the cabinet body (1). The air outlet (10) is close to the back panel (12) of the cabinet body (1). When the waste gas treatment device (4) is operating, it draws in harmful waste gas generated inside the cabinet body (1) through the dust collector (3). Inside the cabinet body (1), a first guide plate (400), a second guide plate (5), and a third guide plate (6) are fixed sequentially from top to bottom. The first guide plate (400) The upper end of the first guide plate (400) is inclined towards the front of the air outlet (10), and a first gap (7) is formed between the upper end of the first guide plate (400) and the top of the cabinet (1). The second guide plate (5) and the third guide plate (6) are vertically arranged and both are close to the back panel (12). The lower end of the first guide plate (400) is aligned with the upper end of the second guide plate (5) and there is a second gap (8) between them. The lower end of the second guide plate (5) is aligned with the upper end of the third guide plate (6) and there is a third gap (9) between them. The lower end of the third guide plate (6) is aligned with the bottom of the cabinet (1) and there is a fourth gap (13).

2. The ductless fume hood as described in claim 1, characterized in that, The top opening area of ​​the air collecting hood (3) is smaller than the bottom opening area, and the bottom opening edge of the air collecting hood (3) is sealed to the edge of the air outlet (10).

3. The ductless fume hood as described in claim 1, characterized in that, The air outlet (10) is a rectangular opening.

4. The ductless fume hood as described in claim 1, characterized in that, The top of the cabinet (1) is provided with a partition (14), and the air collection hood (3) and the exhaust gas treatment device (4) are both located inside the partition (14).

5. The ductless fume hood as described in claim 1, characterized in that, The cabinet (1) has a frame (15) on each side of the doorway, and the cabinet door (2) is located between the two frames (15).

6. The ductless fume hood as described in claim 4, characterized in that, The enclosure (14) is equipped with a controller, and the front side of the enclosure (14) is equipped with a touch screen (150). The exhaust gas treatment device (4) and the touch screen (150) are electrically connected to the controller.

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