Double-fan biological safety cabinet

Abstract

The utility model relates to the technical field of safety cabinets, and particularly discloses a double-fan biological safety cabinet which comprises a cabinet body, a working cabin, an exhaust purification module and a descending purification module, the front side of the cabinet body is provided with a liftable front window; the working cabin is arranged on the inner side of the cabinet body, and a purification cavity is formed between the working cabin and the top of the inner side of the cabinet body; the discharge purification module is arranged in the purification cavity and is used for purifying gas in the purification cavity and discharging the purified gas out of the cabinet body; the descending purification module is arranged in the purification cavity and is used for purifying gas in the purification cavity and then conveying the purified gas to the working cabin; the exhaust purification module and the descending purification module can suck gas on the two sides of the purification cavity correspondingly. According to the utility model, the airflow flowing into the front window operation port is more uniform, and filters with different resistances can be selected, so that the manufacturing and processing difficulty and the subsequent machine debugging difficulty are reduced; and the problems of difficulty in model selection and high noise of a single fan can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of safety cabinets, in particular to a double - fan biological safety cabinet. Background Art

[0002] A biological safety cabinet is a box - type air - purification negative - pressure safety device that can prevent the aerosol escape of certain dangerous or unknown biological particles during the experimental operation process. All biological pollution parts in the biological safety cabinet are in a negative - pressure state or surrounded by a negative - pressure channel and a negative - pressure ventilation system. It is widely used in scientific research, teaching, clinical inspection and production in the fields of microbiology, biomedicine, genetic engineering, biological products, etc. It is the most basic safety protection equipment in the primary protection barrier of laboratory biological safety. The working principle of the biological safety cabinet is mainly to suck the air inside the cabinet outwards to keep the inside of the cabinet in a negative - pressure state, and at the same time protect the staff through the downward airflow. The downward airflow is a mixed air of part of the inflow airflow and part of the vertical airflow, which is sent to the working area after being filtered by a high - efficiency air filter to avoid the contamination of the processed samples.

[0003] In the prior art, biological safety cabinets all use a single fan to control the inflow air volume and the downward air volume. The air flow sucked by the fan is part of the air flowing in from the front - window operation port, and the lowest average flow rate of the air flowing in from the front - window operation port is 0.50 m / s, and the other part is the downward airflow in the working area. The fan sucks the two airflows into a space for synthesis, and then discharges 30% of the gas to the outside after filtration, and the remaining 70% of the gas flows back to the working area after filtration. However, using a single fan to control the inflow air volume and the downward air volume requires ensuring that the resistances of the two filters are the same, and using a single fan also has the defects of difficult fan selection, high working noise, and uneven front - window inflow wind speed. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is: how to solve the problems of difficult fan selection, high working noise, and uneven front - window inflow wind speed existing in the prior art.

[0005] To solve the above - mentioned technical problems, the utility model provides a double - fan biological safety cabinet, including:

[0006] A cabinet body, the front of the cabinet body is provided with a liftable front window;

[0007] A working chamber, the working chamber is arranged inside the cabinet body, and a purification cavity is formed between the working chamber and the inner top of the cabinet body;

[0008] An outer - discharge purification module, the outer - discharge purification module is arranged in the purification cavity, and the outer - discharge purification module is used to purify the gas in the purification cavity and then discharge it outside the cabinet body; and

[0009] A downward purification module is provided in the purification cavity. The downward purification module is used to purify the gas in the purification cavity and then transport it to the working chamber.

[0010] Among them, the exhaust purification module and the downward purification module can respectively inhale the gases on both sides of the purification cavity.

[0011] Further preferably, a first diversion channel is formed between the working chamber and the bottom of the cabinet body, and a second diversion channel is formed between the working chamber and the back surface of the cabinet body. The second diversion channel is used to connect the purification cavity and the first diversion channel.

[0012] Further preferably, an air inlet is provided on one side of the first diversion channel close to the front window.

[0013] Further preferably, the exhaust purification module includes an exhaust static pressure box and an exhaust fan. The exhaust static pressure box is provided in the purification cavity. The exhaust static pressure box is provided with an exhaust air outlet communicating with the outside, and the exhaust fan is provided at one end of the exhaust static pressure box away from the exhaust air outlet.

[0014] Further preferably, the exhaust purification module further includes an exhaust filter. The exhaust filter is provided in the exhaust static pressure box, and the exhaust filter is placed between the exhaust fan and the exhaust air outlet.

[0015] Further preferably, the downward purification module includes a downward static pressure box and a downward fan. The exhaust fan and the downward fan are respectively provided on both sides of the purification cavity, and the downward fan is communicated with the downward static pressure box.

[0016] Further preferably, the downward purification module further includes a downward filter. The downward static pressure box is provided with a downward air outlet communicating with the working chamber, and the downward filter covers the downward air outlet.

[0017] Compared with the prior art, the biosafety cabinet with double fans provided by the present invention has the following beneficial effects:

[0018] The utility model improves the protection of the safety cabinet for personnel by setting an exhaust purification module and a descending purification module in the purification cavity, and defining that the exhaust purification module and the descending purification module can respectively inhale the gas on both sides of the purification cavity, so that the air flow flowing in from the front window operation port will be relatively uniform. In addition, by controlling the gas discharge and the reflux descent respectively through the exhaust purification module and the descending purification module, filters with different resistances can be selected, reducing the manufacturing and processing difficulty and the difficulty of subsequent debugging of the machine. Moreover, by adopting the exhaust purification module and the descending purification module, the resistance value of the fan and the single-fan air volume can be reduced, reducing the noise and making the fan selection more extensive, thus avoiding the problems of difficult single-fan selection and high noise. Brief Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of a double-fan biological safety cabinet according to this embodiment.

[0020] Figure 2 is an internal schematic diagram of a double-fan biological safety cabinet according to this embodiment.

[0021] Figure 3 is a front view of a double-fan biological safety cabinet according to this embodiment.

[0022] Figure 4 is this embodiment Figure 3 A cross-sectional view of the A-A section (the arrows in the figure indicate the air flow direction).

[0023] Figure 5 is a top view of a double-fan biological safety cabinet according to this embodiment.

[0024] Figure 6 is this embodiment Figure 5 A cross-sectional view of the B-B section.

[0025] In the figure:

[0026] 10, cabinet body; 11, front window; 12, air inlet; 13, first diversion channel; 14, purification cavity; 15, second diversion channel;

[0027] 20, working chamber;

[0028] 30, exhaust purification module; 31, exhaust static pressure box; 32, exhaust air outlet; 33, exhaust fan; 34, exhaust filter;

[0029] 40, descending purification module; 41, descending static pressure box; 42, descending fan; 43, descending filter. Detailed Embodiment

[0030] The following will further describe in detail the specific embodiments of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0032] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0033] In addition, unless otherwise clearly defined and limited, the terms "mounted", "connected" and "coupled" shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0035] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0036] As Figures 1 - 6 shown, this embodiment provides a double - fan biosafety cabinet, which includes a cabinet body 10. An operation opening is formed on the front surface of the cabinet body 10, and a liftable front window 11 is provided on the front surface of the cabinet body 10. The operation opening can be opened and closed by lifting the front window 11.

[0037] In some embodiments, a working chamber 20 is provided inside the cabinet body 10, and a purification cavity 14 is formed between the working chamber 20 and the inner top of the cabinet body 10; an exhaust purification module 30 and a downward purification module 40 are provided in the purification cavity 14. Among them, the exhaust purification module 30 is used to purify the gas in the purification cavity 14 and then discharge it outside the cabinet body 10; the downward purification module 40 is used to purify the gas in the purification cavity 14 and then transport it to the working chamber 20; the exhaust purification module 30 and the downward purification module 40 can respectively suck the gas on both sides of the purification cavity 14; in this way, the inflowing air from the front window operation opening can be made more uniform, thereby improving the protection of the safety cabinet for personnel; in addition, by separately controlling the gas discharge and the reflux and descent through the exhaust purification module 30 and the downward purification module 40, filters with different resistances can be selected, reducing the manufacturing and processing difficulty and the difficulty of subsequent debugging of the machine; and by using the exhaust purification module 30 and the downward purification module 40, the resistance value of the fan and the single - fan air volume can be reduced, reducing the noise and making the fan selection more extensive, thereby avoiding the problems of difficult single - fan selection and high noise.

[0038] In some embodiments, a first diversion channel 13 is formed between the working chamber 20 and the bottom of the cabinet body 10, and a second diversion channel 15 is formed between the working chamber 20 and the back surface of the cabinet body 10. The second diversion channel 15 is used to connect the purification cavity 14 and the first diversion channel 13. An air inlet 12 is provided on one side of the first diversion channel 13 close to the front window 11; during use, the mixed air of part of the inflowing air and part of the vertical air enters the first diversion channel 13 through the air inlet 12, and then is diverted to the purification cavity 14 through the second diversion channel 15.

[0039] In some embodiments, the exhaust purification module 30 includes an exhaust static pressure chamber 31 and an exhaust fan 33. The exhaust static pressure chamber 31 is disposed in the purification cavity 14. The exhaust static pressure chamber 31 is provided with an exhaust air outlet 32 communicating with the outside. The exhaust fan 33 is disposed at one end of the exhaust static pressure chamber 31 away from the exhaust air outlet 32. The exhaust purification module 30 further includes an exhaust filter 34. The exhaust filter 34 is disposed in the exhaust static pressure chamber 31 and is placed between the exhaust fan 33 and the exhaust air outlet 32. During use, the exhaust fan 33 is started to draw the mixed air in the purification cavity 14 into the exhaust static pressure chamber 31, and then it is discharged through the exhaust air outlet 32 after being filtered by the exhaust filter 34.

[0040] In the above embodiments, the gas filtered by the exhaust filter 34 can be directly discharged into the laboratory or discharged into the atmosphere through the exhaust duct.

[0041] In some embodiments, the downward purification module 40 includes a downward static pressure chamber 41 and a downward fan 42. The exhaust fan 33 and the downward fan 42 are respectively disposed on both sides of the purification cavity 14. The downward fan 42 communicates with the downward static pressure chamber 41. The downward purification module 40 further includes a downward filter 43. The downward static pressure chamber 41 is provided with a downward air outlet communicating with the working chamber 20. The downward filter 43 covers the downward air outlet. During use, the downward fan 42 draws the mixed air in the purification cavity 14 into the downward static pressure chamber 41, and after passing through the downward filter 43, it enters the working chamber 20 to form a vertical downward air flow to supplement the air in the working area and protect the staff.

[0042] In other embodiments, taking the A2-1100 type biological safety cabinet as an example, the dimensions of its operation area are (length × width × height): 1100×625×625 mm, the inflow air speed is 0.53 m / s, the downward air speed is 0.33 m / s, the exhaust air volume: 420 m 3 / h, the downward air volume: 793 m 3 / h, the total air volume: 1213 m 3 / h, the single fan intake air volume is 1213 m 3 / h, the resistance of the whole biological safety cabinet is 300 - 500 pa. Due to the limited space inside the A2-1100 type biological safety cabinet, the maximum size of the single fan can only be up to a diameter of 400 mm. Many manufacturers design it with diameters of 310 and 355 mm. When the fan air volume reaches 1213 m 3The resistance that the fan can overcome is 300 Pa per hour. This fan is not suitable for the upper safety cabinet either, because the resistance of the filter will increase during use. To maintain an inflow air speed of 0.53 m / s and a downward air speed of 0.33 m / s for a long time, a single fan cannot meet the requirements. Therefore, the present invention uses two fans, that is, the exhaust fan 33 controls the exhaust air volume, and the downward fan 42 controls the downward air volume. The exhaust static pressure box 31 and the downward static pressure box 41 are separated separately, and the air volumes are inhaled by two different fans respectively, and the resistances of the exhaust filter 34 and the downward filter 43 can also be made different.

[0043] In addition, the two fans are arranged in a way that there is one on each side. Assuming the downward fan 42 is on the left, then 80% of the air volume inhaled by the downward fan 42 will be inhaled from the air inlet 12 of the front window on the left and within the working area on the left, and 20% will be inhaled from the air inlet 12 of the front window on the right and within the working area on the right. The exhaust fan 33 is on the right, so the air volume inhaled by the exhaust fan 33 will be inhaled from the air inlet 12 of the front window on the right and within the working area on the right. When the two fans inhale air currents on the left and right sides of the safety cabinet respectively, the influence on each other is not significant. Taking the A2-1100 type biological safety cabinet as an example, then the resistance overcome by the downward fan 42 is only 200 - 250 Pa, and the resistance overcome by the exhaust fan 33 is only 100 - 150 Pa. The air inhaled by the fan of the traditional A2 safety cabinet is in a parallel static pressure box, and the pressure values of the two static pressure boxes are the same, and the resistance values of the two filters also need to be the same to achieve 30% flowing out through the exhaust filter and 70% flowing into the working area through the downward filter. Therefore, using the exhaust fan 33 and the downward fan 42 to separately complete the work previously done by a single fan can reduce the resistance value of the fan and the air volume of a single fan, making the fan selection more extensive.

[0044] It should be noted that after using two fans to work independently, the total power of the two fans during operation will be higher than that of a single fan, and the individual power of the two fans is reduced, so that the noise will also be lower than before, improving the user experience.

[0045] In some embodiments, two static pressure boxes are separate and each has a fan inhaling air volume, and the exhaust filter 34 and the downward filter 43 are not related. Therefore, the resistances of the two can be made the same or not the same, reducing the manufacturing and processing difficulty and also reducing the difficulty of subsequent machine debugging, thereby reducing part of the cost.

[0046] In other embodiments, the exhaust fan 33 and the downward fan 42 inhale air on both sides of the purification cavity 14, so that the air flow flowing in from the front window operation port will be relatively uniform, thereby improving the protection of the safety cabinet for personnel.

[0047] In summary, the embodiment of the present utility model provides a double - fan biological safety cabinet. By arranging an exhaust purification module 30 and a downward purification module 40 in the purification cavity 14, and defining that the exhaust purification module 30 and the downward purification module 40 can respectively inhale the gases on both sides of the purification cavity 14, the air flow flowing in from the front - window operation port will be relatively uniform, thereby improving the protection of the safety cabinet for personnel. In addition, by controlling the gas discharge and the reflux and descent respectively through the exhaust purification module 30 and the downward purification module 40, filters with different resistances can be selected, reducing the manufacturing and processing difficulty and the difficulty of subsequent debugging of the machine. Moreover, by adopting the exhaust purification module 30 and the downward purification module 40, the resistance value of the fan and the air volume of a single fan can be reduced, reducing the noise and making the fan selection more extensive, thus avoiding the problems of difficult single - fan selection and high noise.

[0048] The above - mentioned is only the preferred embodiment of the present utility model. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present utility model, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present utility model. The basic principle, main features and advantages of the present utility model have been shown and described above. For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above - mentioned preferred embodiment. The embodiments should be regarded as exemplary and non - restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model.

[0049] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A dual-fan biological safety cabinet, characterized in that: include: A cabinet body, wherein a front window which can be raised and lowered is provided on the front of the cabinet body; A working cabin, the working cabin is arranged inside the cabinet, and a purification cavity is formed between the working cabin and the inner top of the cabinet; An external exhaust purification module, the external exhaust purification module is arranged in the purification cavity, and the external exhaust purification module is used to purify the gas in the purification cavity and discharge it to the outside of the cabinet; and A descending purification module, the descending purification module is arranged in the purification cavity, and the descending purification module is used to purify the gas in the purification cavity and then transport it to the working chamber; Wherein, the external exhaust purification module and the descending purification module can respectively inhale the gas on both sides of the purification cavity.

2. A dual-fan biological safety cabinet according to claim 1, characterized in that: A first flow guide channel is formed between the working chamber and the bottom of the cabinet, and a second flow guide channel is formed between the working chamber and the back of the cabinet. The second flow guide channel is used to connect the purification cavity and the first flow guide channel.

3. A dual-fan biological safety cabinet according to claim 2, characterized in that: An air inlet is provided on a side of the first guide channel close to the front window.

4. A dual-fan biological safety cabinet according to claim 1, characterized in that: The external exhaust purification module includes an external exhaust static pressure box and an external exhaust fan. The external exhaust static pressure box is arranged in the purification cavity. The external exhaust static pressure box is provided with an external exhaust air outlet connected to the outside. The external exhaust fan is arranged at one end of the external exhaust static pressure box away from the external exhaust air outlet.

5. A dual-fan biological safety cabinet according to claim 4, characterized in that: The external exhaust purification module further includes an external exhaust filter, which is arranged in the external exhaust static pressure box and placed between the external exhaust fan and the external exhaust air outlet.

6. A dual-fan biological safety cabinet according to claim 4, characterized in that: The descending purification module comprises a descending static pressure box and a descending fan. The external exhaust fan and the descending fan are respectively arranged on both sides of the purification cavity. The descending fan is connected to the descending static pressure box.

7. A dual-fan biological safety cabinet according to claim 6, characterized in that: The descent purification module further includes a descent filter, the descent static pressure box is provided with a descent air outlet communicated with the working compartment, and the descent filter covers the descent air outlet.

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