阅读说明：本技术 一种下降气流均匀的生物安全柜 (Biological safety cabinet with uniform downdraft ) 是由 董耀文 吴高 于 2021-07-22 设计创作，主要内容包括：本发明涉及生物安全柜的技术领域,公开了一种下降气流均匀的生物安全柜,包括送风箱,送风箱设有朝向送风箱左侧送风的送风口,送风口连接有送风机,送风箱内通过主导向板分割形成上送风道和下送风道,主导向板包括朝向送风口的第一导风板,第一导风板开设有与下送风道连通导风孔,第一导风板的两端分别连接有向送风箱左侧延伸的第二导风板和向送风箱右侧延伸的第三导风板,第二导风板和第三导风板的一端分别与送风箱的对应侧面之间设有导风间隙,上送风道与下送风道通过导风间隙连通。本发明的下降气流均匀的生物安全柜,使得送风箱内部的空气流场更加均匀,进入工作区内的下降风速更加均衡,避免产品交叉污染。(The invention relates to the technical field of biological safety cabinets, and discloses a biological safety cabinet with uniform downdraft, which comprises an air supply box, wherein the air supply box is provided with an air supply outlet for supplying air towards the left side of the air supply box, the air supply outlet is connected with an air feeder, the interior of the air supply box is divided into an upper air supply channel and a lower air supply channel through a main guide plate, the main guide plate comprises a first air deflector facing the air supply outlet, the first air deflector is provided with an air guide hole communicated with the lower air supply channel, two ends of the first air deflector are respectively connected with a second air deflector extending towards the left side of the air supply box and a third air deflector extending towards the right side of the air supply box, one ends of the second air deflector and the third air deflector are respectively provided with air guide gaps with corresponding side surfaces of the air supply box, and the upper air supply channel is communicated with the lower air supply channel through the air guide gaps. The biological safety cabinet with uniform downdraft of the invention ensures that the air flow field in the air supply box is more uniform, the downdraft speed in the working area is more balanced, and the cross contamination of products is avoided.)

1. A biological safety cabinet with uniform downdraft is characterized in that: the air supply box is provided with an air supply opening which supplies air towards the left side of the air supply box, the air supply opening is connected with an air supply machine, the air supply box is internally divided into an upper air supply channel and a lower air supply channel through a main guide plate, the main guide plate comprises a first air deflector which faces the air supply opening, the first air deflector is provided with an air guide hole communicated with the lower air supply channel, two ends of the first air deflector are respectively connected with a second air deflector which extends towards the left side of the air supply box and a third air deflector which extends towards the right side of the air supply box, one ends of the second air deflector and the third air deflector are respectively provided with air guide gaps between corresponding sides of the air supply box, and the upper air supply channel and the lower air supply channel are communicated through the air guide gaps.

2. The biohazard safety equipment of claim 1, further comprising: the second air deflector comprises a lower inclined air deflector and a guide air deflector, the guide air deflector is connected with the first air deflector through the lower inclined air deflector, and an included angle R between the lower inclined air deflector and the guide air deflector is 120-135 degrees.

3. A uniform airflow descent biosafety cabinet as claimed in claim 2, wherein: the guide air deflector is provided with an air guide flow divider along the air supply direction of the air supply outlet, the air guide flow divider is positioned in the upper air supply duct, and the guide air deflector is divided into an upper front air guide area and an upper rear air guide area by the air guide flow divider.

4. The biohazard safety equipment of claim 1, further comprising: the first air deflector is obliquely arranged in the left-upper direction, and the upper part of the first air deflector is overlapped with the projection of the lower part of the air supply outlet in the side direction of the air supply box.

5. The biohazard safety equipment of claim 5, wherein: the number of the air guide holes is multiple, the diameter of the air guide holes is 8-10 mm, and the perforation rate of the first air guide plate is 30-40%.

6. The biohazard safety equipment of claim 1, further comprising: the first air deflector comprises a perforated plate positioned at the upper part of the first air deflector and an air return plate positioned at the lower part of the first air deflector, and the air guide holes are formed in the perforated plate.

7. The biohazard safety equipment of claim 1, further comprising: the distance H1 between the second air deflector and the top surface of the air supply box is set to be 90-150 mm.

8. The biohazard safety equipment of claim 1, further comprising: the air guide gap H2 on the left side of the air supply box is 150mm, and the air guide gap H3 on the right side of the air supply box is 200 mm and 250 mm.

9. The biohazard safety equipment of claim 1, further comprising: the upper parts of two sides of the air supply box are respectively provided with an angle air deflector, the two angle air deflectors are respectively arranged towards one corresponding end of the main guide plate in an inclined mode, and the angle between the angle air deflectors and the bottom surface of the air supply box is 50-70 degrees.

10. The biohazard safety equipment of claim 1, further comprising: the air feeder is a forward-inclined centrifugal air feeder which comprises an air outlet, the air outlet is communicated with the air supply outlet, a descending efficient filter is arranged below the air supply box, a flow dispersing plate is arranged below the descending efficient filter, and a working area is arranged below the flow dispersing plate.

Technical Field

The invention relates to the technical field of biological safety cabinets, in particular to a biological safety cabinet with uniform downdraft.

Background

The biological safety cabinet is divided into A1 type, A2 type, B1 type and B2 type, and the double-fan B2 type biological safety cabinet comprises a blower and an exhaust fan. The air blower introduces outside air into the air blowing box, the air enters a working area through the air blowing filter to form descending clean air flow, and unclean air and part of outside air in the working area are sent into the air exhaust box by the exhaust fan and are exhausted to the outside environment through the air exhaust filter.

In the prior art, the inside of the air supply box is an empty box or a simple mesh plate is added, the air supply box has no air guide structure or poor air guide result, and air in the air supply box is driven by the air supply machine to form descending clean air flow through a high-efficiency filter. The air easily forms a chaotic flow field in the air supply box, and the flow direction is uncontrollable. For the backward centrifugal blower, due to the characteristics of axial air inlet and radial air outlet, the air flow rate in the lower area of the centrifugal blower is lower, and the flow rate is lower when the air in the area passes through the air supply filter to form descending clean air flow; the air flow rate of the area corresponding to the air outlet of the centrifugal fan is high, so that when the air in the area forms descending clean air flow through the air supply filter, the flow rate is high, the flow rate of the descending clean air flow entering the working area is not uniform, the difference between the actual measured value of each test point in the YY 0569-2011 document and the average flow rate of the area cannot exceed +/-20% or only basically meet or cannot reach +/-0.08 m/s, and further the cross contamination of products is caused.

Disclosure of Invention

The purpose of the invention is: the biological safety cabinet with uniform downdraft is provided, so that an air flow field in the air supply box is more uniform, the downdraft speed in a working area is more balanced, and the cross contamination of products is avoided.

In order to achieve the purpose, the invention provides a biological safety cabinet with uniform downdraft, which comprises an air supply box, wherein the air supply box is provided with an air supply opening for supplying air towards the left side of the air supply box, the air supply opening is connected with an air supply machine, the interior of the air supply box is divided into an upper air supply channel and a lower air supply channel through a main guide plate, the main guide plate comprises a first air deflector facing the air supply opening, the first air deflector is provided with an air guide hole communicated with the lower air supply channel, two ends of the first air deflector are respectively connected with a second air deflector extending towards the left side of the air supply box and a third air deflector extending towards the right side of the air supply box, an air guide gap is arranged between one end of each of the second air deflector and the third air deflector and the corresponding side surface of the air supply box, and the upper air supply channel is communicated with the lower air supply channel through the air guide gap.

Preferably, the second air guiding plate comprises a lower inclined air guiding plate and a guiding air guiding plate, the guiding air guiding plate is connected with the first air guiding plate through the lower inclined air guiding plate, and an included angle R between the lower inclined air guiding plate and the guiding air guiding plate is 120-135 °.

Preferably, the guide air deflector is provided with an air deflector splitter along the air supply direction of the air supply outlet, the air deflector is located in the upper air supply duct, and the guide air deflector is divided into an upper front guide area and an upper rear guide area by the air deflector.

Preferably, the first air deflector is inclined upward to the left, and a projection of an upper portion of the first air deflector and a projection of a lower portion of the air blowing port in a side direction of the air blowing box overlap.

Preferably, the number of the air guide holes is multiple, the diameter of the air guide hole is 8-10 mm, and the perforation rate of the first air deflector is 30-40%.

Preferably, the first air deflector comprises a perforated plate located at an upper portion of the first air deflector and a return air plate located at a lower portion of the first air deflector, and the air guiding hole is formed in the perforated plate.

Preferably, the distance H1 between the second air deflector and the top surface of the blowing box is set to be 90-150 mm.

Preferably, the air guide gap H2 on the left side of the air supply box is 150mm, and the air guide gap H3 on the right side of the air supply box is 250 mm.

Preferably, the upper parts of the two sides of the air supply box are respectively provided with an angle air deflector, the two angle air deflectors are respectively arranged towards the corresponding end of the main guide plate in an inclined mode, and the angle between each angle air deflector and the bottom surface of the air supply box is 50-70 degrees.

Preferably, the blower is a forward-inclined centrifugal blower, the forward-inclined centrifugal blower includes an air outlet, the air outlet is communicated with the air supply outlet, a descending high-efficiency filter is arranged below the air supply box, a flow dispersing plate is arranged below the descending high-efficiency filter, and a working area is arranged below the flow dispersing plate.

Compared with the prior art, the biological safety cabinet with uniform downdraft of the embodiment of the invention has the beneficial effects that: the blower blows air into the blower box through the blower port to form airflow. The air is sent into the air supply box from the air supply port and is divided into three parts, the air sent into the first part flows into the air guide gap on the left side of the air supply box along the upper air supply duct, and flows reversely into the left part of the lower air supply duct in the air guide gap under the blocking action on the left side of the air supply box and then is discharged downwards to reach a working area; the second part of the air sent in enters the middle part of the lower air supply duct from the air guide hole of the first air deflector and then is discharged downwards to reach a working area, the third part of the air sent in flows into the air guide gap on the right side of the air supply box under the blocking action of the first air deflector, and then reversely flows into the right part of the lower air supply duct in the air guide gap and then is discharged downwards to reach the working area under the blocking action of the right side of the air supply box, so that the air flow sent in the air supply opening is uniformly discharged downwards in the right part, the middle part and the left part of the lower air supply duct respectively. The wind energy sent by the blower is divided into a plurality of parts and the wind speed is reduced under the action of the wind guide holes of the main guide plate and the first wind guide plate in the wind feeding box. The wind is equalized in the air supply box and then passes through the flow dispersing plate through the high-efficiency filter to reach the working area. The wind speed of each point tested on the wind speed testing surface of the biological safety cabinet can meet the requirement that the difference between the measured value of each testing point and the average flow speed of the area in the YY 0569-2011 file should not exceed +/-20%, so that the cross infection rate among samples is reduced.

Drawings

Fig. 1 is a schematic view of the overall structure of the embodiment of the present invention.

Fig. 2 is a schematic front view of the blower box according to the embodiment of the present invention.

Fig. 3 is a schematic top view of the blower box according to the embodiment of the present invention.

In the figure:

10. an air supply box; 11. an air supply outlet; 12. a blower; 13. a main guide plate; 14. an upper air supply duct; 15. a lower air supply duct;

20. a first air deflector; 21. a wind guide hole;

30. a second air deflector; 31. a lower inclined air deflector; 32. a flow guide air deflector; 33. an air guide flow distribution plate; 34. an upper front wind guiding area; 35. an upper rear wind guide area;

40. a third air deflector;

50. a wind guide gap; 51. an angle air deflector; 52. a descending high efficiency filter; 53. a flow dispersing plate; 54. a working area.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "right", "left", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. used herein are used to indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the terms "connected," "fixed," and the like are used in a broad sense, and for example, the terms "connected," "connected," and "fixed" may be fixed, detachable, or integrated; the connection can be mechanical connection or welding connection; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1 to 3, a biological safety cabinet with uniform downdraft according to a preferred embodiment of the present invention includes a wind box 10, the wind box 10 is provided with a wind outlet 11 for blowing wind toward the left side of the wind box 10, the wind outlet 11 is connected with a wind blower 12, the interior of the wind box 10 is divided by a main guide plate 13 to form an upper wind channel 14 and a lower wind channel 15, the main guide plate 13 includes a first wind deflector 20 facing the wind outlet 11, the first wind deflector 20 is provided with a wind guide hole 21 communicated with the lower wind channel 15, two ends of the first wind deflector 20 are respectively connected with a second wind deflector 30 extending toward the left side of the wind box 10 and a third wind deflector 40 extending toward the right side of the wind box 10, one ends of the second wind deflector 30 and the third wind deflector 40 are respectively provided with a wind guide gap 50 between corresponding side surfaces of the wind box 10, and the upper wind channel 14 and the lower wind channel 15 are communicated with each other through the wind guide gap 50.

In the biosafety cabinet with uniform downdraft of the present invention, the blower 12 blows air into the blower box 10 through the blower port 11 to form an air current. The air flow sent into the air box 10 from the air supply opening 11 is divided into three parts, the air flow sent in the first part flows into the air guide gap 50 on the left side of the air box 10 along the upper air supply channel 14, and flows into the left part of the lower air supply channel 15 in a whirling way in the air guide gap 50 under the blocking action of the left side of the air box 10 and then flows into the working area 54; the second part of the delivered air flow enters the middle part of the lower air supply duct 15 from the air guide hole 21 of the first air guide plate 20 and then flows downwards into the working area 54, the third part of the delivered air flow circles to the air guide gap 50 on the right side of the air supply box 10 under the blocking action of the first air guide plate 20, then circles to flow into the right part of the lower air supply duct 15 in the air guide gap 50 under the blocking action of the right side of the air supply box 10 and then flows downwards into the working area 54, and therefore the air flow delivered into the air supply opening 11 is respectively and uniformly discharged downwards at the right part, the middle part and the left part of the lower air supply duct 15. The airflow sent by the blower 12 is divided into a plurality of parts and the speed of the airflow is reduced under the action of the second guide plate 30, the third guide plate 40 and the air guide holes 21 of the first air guide plate 20 in the blower box 10. The air flow is equalized in the blow box 10 and then passes through the diffuser plate 53 through the high efficiency filter to the working area 54. The wind speed of each point tested on the wind speed testing surface of the biological safety cabinet can meet the requirement that the difference between the measured value of each testing point and the average flow speed of the area in the YY 0569-2011 file should not exceed +/-20%, so that the cross infection rate among samples is reduced.

As shown in fig. 2 to 3, the second air guiding plate 30 further includes a lower inclined air guiding plate 31 and a guiding air guiding plate 32, the guiding air guiding plate 32 is connected to the first air guiding plate 20 by the lower inclined air guiding plate 31, and an included angle R between the lower inclined air guiding plate 31 and the guiding air guiding plate 32 is 120-135 °. The air flow entering the upper supply air duct 14 is guided downwards by the lower inclined air deflectors 31, slowing down the inflow velocity of the air flow and shortening the distance of the air flow from the working area 54 in height. Specifically, the air deflector 32 is disposed parallel to the work surface.

Further, as shown in fig. 3, the guide air deflector 32 is provided with an air deflection/diversion plate 33 along the air blowing direction of the air blowing port 11, and the air deflection/diversion plate 33 is positioned in the upper air blowing duct 14. Specifically, the air guiding splitter 33 divides the air guiding plate 32 into an upper front air guiding area 34 and an upper rear air guiding area 35, and the upper front air guiding area 34 and the upper rear air guiding area 35 have the same size. The air guiding and dividing plate 33 further divides the air flow in the upper air supply duct 14, so that the air flow in the upper air supply duct 14 is distributed more uniformly in the front and back directions.

Further, as shown in fig. 2, the first air deflector 20 is obliquely arranged in the left-upper direction to increase the airflow receiving area of the first air deflector 20 towards the air supply opening 11 and increase the airflow inflow of the first air deflector 20, the upper end of the first air deflector 20 is far away from the air supply opening 11 relative to the lower end, so as to slow down the airflow velocity entering the lower air supply duct 15, the lower end of the first air deflector 20 is closer to the right side of the air supply box 10, so as to shorten the distance of the airflow from the first air deflector 20 to the right side of the air supply box 10, and improve the airflow supplement efficiency of the right side of the air supply box 10. The upper part of the first air deflector 20 is overlapped with the projection of the lower part of the air supply opening 11 in the side surface direction of the air supply box 10, so that the airflow at the lower part of the air supply opening 11 directly flows to the first air deflector 20, and the flow rate and the flow speed of the airflow of the first air deflector 20 are ensured.

Further, as shown in fig. 3, the number of the air guiding holes 21 is multiple, the diameter of the air guiding hole 21 is set to 8-10 mm, and the perforation rate of the first air guiding plate 20 is set to 30-40%. Specifically, the air guiding holes 21 are uniformly distributed in the first air guiding plate 20. The diameter of the air guide hole 21 is set to be 8-10 mm, so that the flow speed of the air flow entering the lower air supply duct 15 from the first air guide plate 20 is controlled. The airflow is divided into two parts by the first air deflector 20, one part enters the lower air supply duct 15 through the air guide holes 21, the other part changes the airflow to convolute and flow to the right side of the air supply box 10 through the gap between the air guide holes 21, and the flow rate of the airflow flowing into the lower air supply duct 15 and flowing to the right side of the air supply box 10 is controlled by setting the perforation rate at 30-40%. Because the middle part of the lower air delivery duct 15 can flow in by the convolution of the air guiding holes 21 and the air flows on the left and right sides of the air delivery box 10, the perforation rate of the first air deflector 20 is set to be 30-40%, compared with the air flowing into the lower air delivery duct 15 through the air guiding holes 21, more air flows on the first air deflector 20 flow to the right side of the air delivery box 10, and the uniformity of the whole air volume is improved.

Further, as shown in fig. 2, the first air guiding plate 20 includes a perforated plate located at an upper portion of the first air guiding plate 20 and a return air plate located at a lower portion of the first air guiding plate 20, and the air guiding hole 21 is opened in the perforated plate. The air flow is introduced into the lower air supply duct 15 through the air guide holes 21 on the opening plate, and the air return plate is not provided with holes, so that the air flow at the lower part of the first air guide plate 20 is centralized and revolved to the right side of the air supply box 10, the shunting function of the first air guide plate 20 is more definite, and the shunting effect is improved.

Further, the distance H1 between the second air deflector 30 and the top surface of the air supply box 10 is set to be 90-150 mm, so as to ensure that the flow rate of the air flow in the upper air supply duct 14 is controlled within a certain range, and ensure the air supply efficiency.

Further, as shown in fig. 2, the air guiding gap 50H2 on the left side of the air supply box 10 is 150mm, the air guiding gap 50H3 on the right side of the air supply box 10 is 250mm, the air guiding gap 50 provides a revolving space for the air flow flowing into the upper air supply duct 14, the air guiding gap 50 on the left side is smaller than the air guiding gap 50 on the right side, and the air flow revolving on the left side and the air flow flowing into the air guiding hole 21 flow oppositely, so that the H2 gap is smaller, the flow rate of the air flow revolving from the upper air supply duct 14 flowing into the lower air supply duct 15 is increased, and the flow rate of the air flow flowing into the air guiding hole 21 is reduced.

Further, as shown in fig. 2 to 3, the upper portions of both sides of the air blowing box 10 are provided with the angle air deflectors 51, the two angle air deflectors 51 are respectively arranged to be inclined toward the corresponding end of the main guide plate 13, and the air flow flowing from the upper air blowing duct 14 to both sides of the air blowing box 10 is guided by the angle air deflectors 51 to swirl to the lower air blowing duct 15. The angle between the angle deflector 51 and the bottom surface of the blow box 10 is preferably 50 to 70 ° to increase the flow direction coverage area of the air flow flowing into the lower blow duct 15, and the angle between the angle deflector 51 and the bottom surface of the blow box 10 is preferably 60 ° to improve the swirling and guiding effect of the air flow.

Further, as shown in fig. 1, the blower 12 is a forward-inclined centrifugal blower 12, the forward-inclined centrifugal blower 12 includes an air outlet, the air outlet communicates with the air outlet 11, a descending high-efficiency filter 52 is provided below the air box 10, a flow dispersing plate 53 is provided below the descending high-efficiency filter 52, and a working area 54 is provided below the flow dispersing plate 53. Specifically, the air blown by the blower 12 forms an air flow, which is guided by the main guide plate 13 in the blower box 10, and then the air flow descends to the descending high efficiency filter through the lower duct 15, and reaches the working area 54 through the diffuser plate 53.

In summary, the embodiment of the present invention provides a biosafety cabinet with uniform downward airflow, wherein a blower 12 blows air into a blower box 10 through a blower outlet 11 to form an airflow. The air is sent into the air box 10 from the air supply port 11 and is divided into three parts, the first part sent air flows into the air guide gap 50 on the left side of the air box 10 along the upper air supply duct 14, and reversely flows into the left part of the lower air supply duct 15 in the air guide gap 50 under the blocking action of the left side of the air box 10, and then is discharged downwards to reach a working area 54; the second part of the air sent in enters the middle of the lower air supply duct 15 from the air guide hole 21 of the first air deflector 20 and then is discharged downwards to reach the working area 54, the third part of the air sent in enters the air guide gap 50 on the right side of the air supply box 10 under the blocking action of the first air deflector 20, then reversely flows into the right part of the lower air supply duct 15 in the air guide gap 50 and then is discharged downwards to reach the working area 54 under the blocking action of the right side of the air supply box 10, and further, the air flow sent in the air supply opening 11 is uniformly discharged downwards in the right part, the middle part and the left part of the lower air supply duct 15 respectively. The wind energy from the blower 12 is divided into a plurality of parts and the wind speed is reduced by the wind guiding holes 21 of the main guiding plate 13 and the first wind guiding plate 20 in the wind box 10. The air is evenly distributed in the air box 10 and then passes through the diffuser plate 53 through the high efficiency filter to reach the working area 54. The wind speed of each point tested on the wind speed testing surface of the biological safety cabinet can meet the requirement that the difference between the measured value of each testing point and the average flow speed of the area in the YY 0569-2011 file should not exceed +/-20%, so that the cross infection rate among samples is reduced.

The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.