CN220992268U

CN220992268U - Outer-exhaust type fume hood with ultra-clean function

Info

Publication number: CN220992268U
Application number: CN202322853377.9U
Authority: CN
Inventors: 陈计金; 陈计银; 邹粉荣; 陈思霖
Original assignee: Junlebo Technology Shanghai Co ltd
Current assignee: Junlebo Technology Shanghai Co ltd
Priority date: 2023-10-24
Filing date: 2023-10-24
Publication date: 2024-05-24
Anticipated expiration: 2033-10-24

Abstract

The utility model discloses an outer-discharge type fume hood with an ultra-clean function, which comprises a hood body, a front baffle, a high-efficiency filtering system and a supporting plate, wherein the supporting plate is fixedly arranged at the front part inside the hood body, a porous guide plate is fixedly arranged at the top of the supporting plate, a plurality of holes are uniformly formed in the porous guide plate, the high-efficiency filtering system is fixedly arranged at the top of the porous guide plate, a centrifugal fan is fixedly arranged at the top of the high-efficiency filtering system, a group of primary filters and a high-efficiency HEPA (high-efficiency HEPA) filter or an ultra-efficient particulate matter filter are adopted in the high-efficiency filtering system, the front baffle is fixedly arranged at one side outside the hood body, and a steam-proof LED illuminating lamp is fixedly arranged at one side outside the front baffle. The air inlet flow completely passes through the high-efficiency filtering system, and the air flow is adsorbed and treated into ISO 5 grade (100 grade) clean air through a prefilter and a high-efficiency particulate matter (HEPA) or ultra-efficient particulate matter (ULPA) filter.

Description

Outer-exhaust type fume hood with ultra-clean function

Technical Field

The utility model relates to an externally-arranged type fume hood, in particular to an externally-arranged type fume hood with an ultra-clean function.

Background

In the sample preparation process performed by trace analysis instruments such as ICP-MS, the pollution of the sample by the aerosol of the particles containing the metal ion component floating in the indoor air is strictly prevented, the pollution is negligible in the sample preparation of the constant analysis (the analysis accuracy is usually 10 < -6 > to 10 < -9 > Kg/L or higher), but the pollution in the air has a significant influence on the analysis result in the trace analysis (the analysis accuracy is usually 10 < -10 > to 10 < -12 > Kg/L or lower). Therefore, it is desirable to introduce a positive pressure air stream at the air intake and filter it by High Efficiency Particulate (HEPA) or ultra high efficiency particulate (ULPA) to provide a safe clean zone for these experiments, with cleanliness levels at or above ISO 5 (class 100).

On the other hand, during the sample preparation process, a large amount of acidic gases, other chemical gases, aerosol of particles, aerosol of microorganisms and other pollutants are generated, and these pollutants seriously harm the health of operators and pollute the indoor air environment. Therefore, a reliable negative pressure air flow is required to be formed through the air outlet, and the polluted air flow in the working area is timely discharged, and is subjected to on-site filtration treatment through an activated carbon filter or a particulate matter filter or is discharged to the outside through an external pipeline for centralized treatment.

Both of the above functions are not difficult to implement separately, and some mature technologies and devices have been developed. However, the technology and equipment for organically combining the two at the same time are not yet known.

Full row type pipeline fume chamber: the most widely used laboratory waste gas treatment equipment at present has the basic working principle that gas generated in the sample pretreatment process is pumped to a roof exhaust outlet through a ventilation pipeline in a building, and then is discharged to the atmosphere after being subjected to no filtering treatment or concentrated filtering treatment. The outstanding disadvantages of this type of device are: the method can not provide ultra-clean air flow, can only be used for sample pretreatment operation of common constant analysis, and can not be used for sample pretreatment of high-precision trace analysis; the equipment installation cost is high, and a large number of ventilation pipelines and engineering operations are required; reliability is difficult to ensure, and the sealing performance of each device and the connection part thereof is required to be very reliable on all ventilation paths to ensure the reliability of the system; the energy consumption is large, the energy utilization rate is low, and particularly, when indoor constant-temperature air flow is replaced by outdoor air, a large amount of air conditioner energy consumption is brought; mobility is poor and there is little possibility of movement once installed in position.

Filtration formula self-purification does not have pipeline fume chamber: such devices filter the chemical gases generated during the pretreatment of the sample in situ to clean air and then directly discharge the clean air into the chamber. The fundamental disadvantage of this type of technology is: the ultra-clean gas flow cannot be provided, only the sample pretreatment operation for constant analysis can be performed, and the sample pretreatment for trace analysis cannot be performed.

Ultra-clean bench: such a device can provide a reliable ISO 5 (class 100) clean air flow, preventing the contamination of the sample by the contaminating components in the room air. The fundamental disadvantage of this type of device is: the polluted gas generated in the experimental process cannot be treated, and the polluted gas has potential harm to the physical health of operators and the indoor air environment of a laboratory.

Disclosure of utility model

The utility model aims to provide an externally-arranged type fume hood with an ultra-clean function so as to solve the problems in the background art.

In order to achieve the above purpose, the present utility model provides the following technical solutions: take outer formula fume chamber of ultra-clean function, its characterized in that: including the cabinet body, anterior baffle, high-efficient filtration system and backup pad, the fixed backup pad that is provided with in the anterior of the internal portion of cabinet, the backup pad top is fixed with porous guide plate, evenly be provided with a plurality of holes on the porous guide plate, the top of porous guide plate is fixed with high-efficient filtration system, high-efficient filtration system top is fixed with centrifugal fan, adopt a set of primary filter and a high-efficient HEPA filter or super high-efficient particulate matter filter in the high-efficient filtration system, one side of the external portion of cabinet is fixed with anterior baffle, one side of the external portion of anterior baffle is fixed with the steam-proof LED light.

Preferably, a storage chamber is fixed at a position, close to the bottom, inside the cabinet body, a cabinet door is connected to the outside of the storage chamber through a shaft, and an air gun is placed inside the cabinet body.

Preferably, an inclined plane is arranged at a position, close to the bottom, inside the cabinet body, and the inclined plane is obliquely arranged to the bottom of the cabinet body.

Preferably, the movable porous deck plate is fixed on the inclined plane, a plurality of holes are formed in the movable porous deck plate, a plurality of through holes are formed in the movable porous deck plate, an air flow groove body is formed in one side of the top of the movable porous deck plate, and a plurality of air flow groove bodies are arranged on the movable porous deck plate.

Preferably, the back of the cabinet body is fixed with an air duct, the bottom of the air duct is provided with a through groove, and one end of the inclined plane extends to the inside of the air duct.

Preferably, an exhaust fan is fixed at the top of the air duct, and an anti-backflow one-way exhaust valve is arranged at the top of the exhaust fan.

Compared with the prior art, the utility model has the beneficial effects that: this take outer formula fume chamber of ultra-clean function is rational in infrastructure, has following advantage:

(1) The effect of air purification is realized through being provided with high-efficient filtration system, porous guide plate, backup pad and centrifugal fan, consequently, through centrifugal fan's effect, centrifugal fan produces the air inlet air current, the air inlet air current is whole to be passed high-efficient filtration system, the air current is through prefilter and high-efficient particulate matter (HEPA) or ultra-efficient particulate matter (ULPA) filter adsorption process become ISO 5 grade (100 grades) clean air, most air currents (about 80%) pass porous guide plate downwards, form evenly distributed's heavy air current, get into the clean air current of the rest about 20% of work area with the pattern of vertical laminar flow and send the bar air current groove of front window bottom and opening edge by a special fan, form steady vertical air curtain, under the effect of the vertical air curtain of front window bottom and opening edge down, indoor air is kept apart completely with the air current in the cabinet interior work area, prevent indoor air direct entering work area and prevent the polluted gas in the work area from escaping from the front window.

(2) In the working area, the sinking airflow is fully mixed with the polluted gas in the cabinet, then passes through diversion holes or diversion grooves in all directions close to the working table surface, is converged into an exhaust airflow duct, and is sent into an exhaust ventilating duct for subsequent treatment through an anti-backflow one-way exhaust valve.

(3) In the air inlet filtering area, the sealing performance is another part which needs to be considered seriously, the filtering effect of the air inlet flow is difficult to ensure due to the fact that the sealing performance is slightly negligent, and in the design scheme, all the connecting surfaces are formed by adopting integral hot-melt seamless welding processing, so that unfiltered air flow is not leaked.

Drawings

FIG. 1 is a schematic diagram of an exploded front view of the present utility model;

FIG. 2 is a schematic elevational view of the present utility model;

FIG. 3 is a schematic diagram of a back view structure of the present utility model;

FIG. 4 is a schematic top view of the explosive structure of the present utility model;

Fig. 5 is a schematic view of the internal structure of the present utility model.

In the figure: 1. a cabinet body; 2. a front baffle; 3. an efficient filtration system; 4. a porous baffle; 5. a support plate; 6. a movable perforated deck plate; 7. an air flow groove body; 8. reverse flow prevention one-way exhaust valve; 9. an inclined plane; 10. a cabinet door; 11. a centrifugal fan; 12. an air gun; 13. an air duct; 14. an exhaust fan; 15. vapor-proof LED lighting lamp; 16. a storage chamber.

Detailed Description

The technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model, and all other embodiments obtained by those skilled in the art without making any inventive effort based on the embodiments of the present utility model are within the scope of protection of the present utility model.

Referring to fig. 1-5, an embodiment of the present utility model is provided: the outer-exhaust type fume hood with the ultra-clean function comprises a hood body 1, a front baffle 2, a high-efficiency filter system 3 and a support plate 5, wherein the support plate 5 is fixedly arranged at the front part inside the hood body 1, a porous guide plate 4 is fixedly arranged at the top of the support plate 5, a plurality of holes are uniformly formed in the porous guide plate 4, the high-efficiency filter system 3 is fixedly arranged at the top of the porous guide plate 4, a centrifugal fan 11 is fixedly arranged at the top of the high-efficiency filter system 3, a group of primary filters and a high-efficiency HEPA filter or an ultra-efficient particulate matter filter are adopted in the high-efficiency filter system 3, the front baffle 2 is fixedly arranged at one side outside the hood body 1, and a steam-preventing LED illuminating lamp 15 is fixedly arranged at one side outside the front baffle 2;

Through the effect of the centrifugal fan 11, the centrifugal fan 11 generates an air inlet flow, the air inlet flow completely passes through the high-efficiency filtering system 3, the air flow is adsorbed and treated into ISO 5 grade (100 grade) clean air through a prefilter and a high-efficiency particulate matter (HEPA) or ultra-efficiency particulate matter (ULPA) filter, most of the air flow (about 80%) downwards passes through the porous guide plate 4 to form uniformly distributed sinking air flow, the rest about 20% of the clean air flow entering the working area in a vertical laminar flow mode is pumped to the strip-shaped air flow grooves at the bottom of the front window and the lower edge of the opening by a special fan to form a stable vertical air curtain, and under the effect of the vertical air curtain at the bottom of the front window and the lower edge of the opening, the indoor air is completely isolated from the air flow in the working area in the cabinet, so that the indoor air is prevented from directly entering the working area and the polluted air in the working area is prevented from escaping from the front window;

a storage chamber 16 is fixed at a position, close to the bottom, inside the cabinet body 1, a cabinet door 10 is connected to the outside of the storage chamber 16 through a shaft, an air gun 12 is placed inside the cabinet body 1, an inclined plane 9 is arranged at a position, close to the bottom, inside the cabinet body 1, and the inclined plane 9 is obliquely arranged at the bottom of the cabinet body 1;

The movable porous deck plate 6 is fixed on the inclined plane 9, a plurality of holes are formed in the movable porous deck plate 6, a plurality of through holes are formed in the movable porous deck plate 6, an air flow groove body 7 is formed in one side of the top of the movable porous deck plate 6, and a plurality of air flow groove bodies 7 are formed in the movable porous deck plate 6;

An air duct 13 is fixed on the back of the cabinet body 1, a through groove is formed in the bottom of the air duct 13, one end of the inclined plane 9 extends into the air duct 13, an exhaust fan 14 is fixed on the top of the air duct 13, and an anti-backflow one-way exhaust valve 8 is arranged on the top of the exhaust fan 14;

In the working area, the sinking airflow is fully mixed with the polluted gas in the cabinet, then passes through diversion holes or diversion grooves in all directions close to the working table surface, is converged into an exhaust airflow duct 13, and is sent into an external exhaust ventilating duct for subsequent treatment through an anti-backflow one-way exhaust valve 8;

In the design scheme, all the connecting surfaces are formed by adopting integral hot melt seamless welding, so that unfiltered air flow is ensured not to leak;

When the device is used, through placing the device at a proper position, then placing a sample into the device, under the action of the centrifugal fan 11, the centrifugal fan 11 generates an air inlet flow, the air inlet flow completely passes through the high-efficiency filtering system 3, the air flow is adsorbed and treated into ISO 5 grade (100 grade) clean air through a prefilter and a high-efficiency particulate matter (HEPA) or ultra-efficiency particulate matter (ULPA) filter, most of the air flow (about 80%) downwards passes through the porous guide plate 4 to form evenly distributed sinking air flow, the rest about 20% of the clean air flow entering a working area in a vertical laminar flow mode is pumped to a strip-shaped air flow groove at the bottom of a front window and at the lower edge of an opening by a special fan, forming a stable vertical air curtain, under the action of the vertical air curtain at the bottom of the front window and the lower edge of the opening, the indoor air is completely isolated from the air flow in the working area in the cabinet, the indoor air is prevented from directly entering the working area and the polluted air in the working area is prevented from escaping from the front window, in the working area, the sinking air flow is fully mixed with the polluted air in the cabinet, then passes through the diversion holes or diversion grooves in all directions close to the working table surface, is converged into the exhaust air flow channel 13, is sent into the exhaust air flow channel for subsequent treatment through the anti-backflow one-way exhaust valve 8, all the connection surfaces are formed by adopting integral hot melt seamless welding, the non-filtered air flow is ensured not to leak, the primary pre-filter is used for removing particles with the particle size of more than 0.5 mu m in the airflow so as to protect a subsequent high-efficiency particulate matter (HEPA) filter or an ultra-high-efficiency particulate matter (ULPA) filter; the high-efficiency particulate matter (HEPA) filter is used for removing particulate matters with the particle size of more than 0.3 mu m, and the adsorption efficiency is as high as more than 99.995 percent; the ultra-efficient particulate matter (ULPA) filter is used for removing particulate matters with the particle size of more than 0.1 mu m, the adsorption efficiency is as high as more than 99.9995 percent, in order to improve the uniformity of the distribution of the sinking airflow on the whole ventilation surface, the scheme is characterized in that a special porous guide plate 4 is arranged at the top part of the cabinet, the quantity, the shape and the distribution of ventilation holes on the porous guide plate 4 are optimized based on a large amount of experimental data, the maximum deviation of the surface wind speed of each point and the average surface wind speed is ensured to be not more than 20 percent in the whole ventilation surface range (refer to the requirement of the related standard of the ventilation cabinet on the wind speed of an air inlet surface), after the sinking airflow is mixed with the polluted gas generated in the experimental process in the working area in the cabinet, under the action of negative pressure, the air is collected into the airflow channel of the exhaust system by diversion holes or diversion trenches which are close to the working table surface and distributed in all directions around. The multidirectional exhaust flow guide effectively eliminates the formation of air flow dead zones and turbulence in the cabinet, and ensures that all polluted gas can be smoothly and smoothly pumped away, so that the effect is obvious when the surface air speed is high, and in order to prevent the air flow in the outer exhaust ventilation pipeline from flowing backwards into the ventilation cabinet when the fan is closed, an anti-backflow one-way exhaust valve 8 is arranged between the ventilation cabinet and the outer exhaust pipeline, and when the fan of the ventilation cabinet is opened, the valve is simultaneously opened; when the fan of the fume hood is closed, the valves are closed at the same time, so that the effectiveness of the isolated air flow is ensured, the flow speed of the optimal isolated air flow is different under different window opening heights, and the control system can automatically adjust the rotating speed of the isolated air flow fan by monitoring the window opening heights in real time based on a data correlation model established for the air flow size and the window heights so as to ensure that the isolated air flow fan can safely operate under various using conditions.

Claims

1. Take outer formula fume chamber of ultra-clean function, its characterized in that: including cabinet body (1), anterior baffle (2), high-efficient filtration system (3) and backup pad (5), the inside anterior fixed backup pad (5) that are provided with of cabinet body (1), backup pad (5) top is fixed with porous guide plate (4), evenly be provided with a plurality of holes on porous guide plate (4), the top of porous guide plate (4) is fixed with high-efficient filtration system (3), high-efficient filtration system (3) top is fixed with centrifugal fan (11), adopt a set of first effect filter and a high-efficient HEPA filter or ultra-efficient particulate matter filter in high-efficient filtration system (3), one side of cabinet body (1) outside is fixed with anterior baffle (2), one side of anterior baffle (2) outside is fixed with vapor-proof LED light (15).

2. The ultra-clean function externally-arranged fume hood according to claim 1, wherein: the cabinet is characterized in that a storage chamber (16) is fixed at a position, close to the bottom, inside the cabinet body (1), a cabinet door (10) is connected to the outside of the storage chamber (16) through a shaft, and an air gun (12) is placed inside the cabinet body (1).

3. The ultra-clean function externally-arranged fume hood according to claim 1, wherein: the cabinet is characterized in that an inclined plane (9) is arranged at the position, close to the bottom, inside the cabinet body (1), and the inclined plane (9) is obliquely arranged at the bottom of the cabinet body (1).

4. An externally arranged fume hood with ultra clean function according to claim 3, wherein: the movable porous deck plate (6) is fixed on the inclined plane (9), a plurality of holes are formed in the movable porous deck plate (6), a plurality of through holes are formed in the movable porous deck plate (6), an air flow groove body (7) is formed in one side of the top of the movable porous deck plate (6), and a plurality of air flow groove bodies (7) are arranged on the movable porous deck plate (6).

5. The ultra-clean function externally-arranged fume hood according to claim 4, wherein: the back of the cabinet body (1) is fixed with an air duct (13), a through groove is formed in the bottom of the air duct (13), and one end of the inclined surface (9) extends to the inside of the air duct (13).

6. The ultra-clean function externally-arranged fume hood according to claim 5, wherein: an exhaust fan (14) is fixed at the top of the air duct (13), and an anti-backflow one-way exhaust valve (8) is arranged at the top of the exhaust fan (14).