CN219682551U - biological safety cabinet - Google Patents

Abstract

The utility model relates to the technical field of medical equipment, and discloses a biosafety cabinet which comprises a box body, a diaphragm plate, a vertical diaphragm plate, an operation table and a prefilter, wherein the box body is provided with a containing space; the transverse partition plate is used for dividing the accommodating space into a filtering space and an operating space, and the rear end of the transverse partition plate is a preset distance away from the backboard of the box body; the vertical partition plate is arranged in the operation space, the top end of the vertical partition plate is in butt joint with the rear end of the transverse partition plate, the bottom end of the vertical partition plate is a preset distance from the bottom plate of the accommodating space, and the vertical partition plate and the back plate of the box body form a first interlayer; the operation table is transversely arranged in the operation space, the rear end of the operation table is in butt joint with the vertical partition plate, a second interlayer is formed between the operation table and the bottom plate of the operation space, and the second interlayer is communicated with the first interlayer; the prefilter is arranged below the operating platform and filters air entering the first interlayer.

Description

Biological safety cabinet

Technical Field

The utility model relates to the technical field of medical equipment, in particular to a biosafety cabinet.

Background

For the animal secondary biosafety cabinet, the animal can generate some impurities with larger particles such as falling hairs, fragments and the like in the experimental process of the operation space. These impurities adhere to the high efficiency filter along with the air flow, which shortens the replacement period of the high efficiency filter. In addition, impurities such as hair scraps adhere to the air duct of the biosafety cabinet, and can block the air duct and affect the clean environment of the biosafety cabinet.

The utility model discloses a biological safety cabinet among the related art, be formed with air supply chamber, return air chamber and working chamber in the box, air supply chamber and working chamber intercommunication, working chamber and return air chamber intercommunication are equipped with the workstation in the working chamber, are equipped with the return air hole on the workstation, are equipped with the filter on the air current passageway between return air hole and the return air chamber, and the return air hole is located the air inlet side of filter, and the bottom side of workstation is equipped with the standing groove, and the filter is vertically placed in the standing groove from top to bottom.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

the distance between the workbench and the bottom plate is smaller, the filter is smaller in size due to the vertical arrangement mode of the filter, and the filter is easy to block, so that the air flow resistance is increased.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the utility model and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.

The embodiment of the disclosure provides a biosafety cabinet to solve the problem of how to perform primary filtration on impurities with larger particles better.

In some embodiments, the biosafety cabinet comprises a case, a diaphragm, a vertical diaphragm, a console, and a prefilter, wherein the case is configured with a receiving space; the transverse partition plate is used for dividing the accommodating space into a filtering space and an operating space, and the rear end of the transverse partition plate is a preset distance away from the backboard of the box body; the vertical partition plate is arranged in the operation space, the top end of the vertical partition plate is in butt joint with the rear end of the transverse partition plate, the bottom end of the vertical partition plate is a preset distance from the bottom plate of the accommodating space, and the vertical partition plate and the back plate of the box body form a first interlayer; the operation table is transversely arranged in the operation space, the rear end of the operation table is in butt joint with the vertical partition plate, a second interlayer is formed between the operation table and the bottom plate of the operation space, and the second interlayer is communicated with the first interlayer; the prefilter is arranged below the operating platform and filters air entering the first interlayer.

In some embodiments, the prefilter comprises a plurality of filter elements, a plurality of the filter elements being spliced together.

In some embodiments, the filter unit comprises a frame, a seal strip, and a filter material, wherein the frame circumscribes the mounting space; the sealing strip is adhered to one surface of the frame outwards along the circumferential direction of the frame; and the filter material is arranged in the installation space.

In some embodiments, the filter unit further comprises a first grating plate secured to the frame, the first grating plate for supporting the filter material.

In some embodiments, the filter unit further comprises a second grid plate secured to the frame, the first grid plate and the second grid plate together sandwiching the filter material.

In some embodiments, two adjacent filter units are provided with protrusions extending outwards at the abutting position, and the other filter unit is provided with a groove, and the protrusions are inserted into the grooves so that the two adjacent filter units are spliced.

In some embodiments, a blocking edge is transversely configured on the inner wall of the first interlayer, the prefilter is lapped on the blocking edge, and the prefilter is a preset distance from the operation table and a preset distance from a bottom plate of the operation space.

In some embodiments, the front end of the console is provided with a first air inlet, and the rear end of the console is provided with a second air inlet.

In some embodiments, the diaphragm plate is provided with an air return port, and the biosafety cabinet further comprises a first filter, a first fan box and a first fan, wherein the first filter is arranged at the air return port; the first fan case is covered on the return air inlet and covers the first filter; the first fan is arranged in the first fan case and used for driving air in the filtering space to flow to the operating space through the first fan case and the first filter.

In some embodiments, the top plate of the box body is provided with an air outlet, and the biosafety cabinet further comprises a second filter, a second fan box and a second fan, wherein the second filter is arranged at the air outlet; the second fan case is covered on the exhaust outlet and covers the second filter; the second fan is arranged in the second fan case and is used for driving air in the filtering space to enter the second fan case, and the air is filtered by the second filter and then is discharged through the air outlet.

The biosafety cabinet provided by the embodiment of the disclosure can realize the following technical effects:

the prefilter is transversely arranged, the filtering area is large, the wind resistance is small, and the air filtering efficiency is high; the filter area of the prefilter is larger, the prefilter is not easy to be blocked by hair scraps, and the replacement period is longer.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the utility model.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:

FIG. 1 is a schematic structural view of a biosafety cabinet provided by an embodiment of the disclosure;

FIG. 2 is a schematic illustration of the biosafety cabinet provided in an embodiment of the present disclosure with the housing and console removed;

FIG. 3 is a schematic cross-sectional view of a biosafety cabinet provided by an embodiment of the disclosure;

FIG. 4 is an enlarged schematic view of portion A of FIG. 3;

FIG. 5 is a schematic diagram of the structure of a prefilter of a biosafety cabinet provided by an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a filtration unit of a biosafety cabinet provided by an embodiment of the disclosure;

fig. 7 is a schematic cross-sectional view of a filtration unit of a biosafety cabinet provided by an embodiment of the disclosure.

Reference numerals:

110: a top plate; 120: a bottom plate; 140: a right side plate; 150: a front panel; 160: a back plate; 170: a diaphragm; 180: a vertical partition board; 200: an operation table; 300: prefilter; 310: a filtering unit; 311: a frame; 312: a sealing strip; 313: a filter material; 314: a first grating plate; 315: a second grating plate; 316: a protrusion; 410: a first blocking edge; 420: a second blocking edge; 510: a first filter; 520: a first fan case; 530: a first fan; 610: a second filter; 620: a second fan case; 630: and a second fan.

Detailed Description

So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.

The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are used primarily to better describe embodiments of the present disclosure and embodiments thereof and are not intended to limit the indicated device, element, or component to a particular orientation or to be constructed and operated in a particular orientation. Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the embodiments of the present disclosure will be understood by those of ordinary skill in the art in view of the specific circumstances.

In addition, the terms "disposed," "connected," "secured" and "affixed" are to be construed broadly. For example, "connected" may be in a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the embodiments of the present disclosure may be understood by those of ordinary skill in the art according to specific circumstances.

The term "plurality" means two or more, unless otherwise indicated.

In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.

It should be noted that, without conflict, the embodiments of the present disclosure and features of the embodiments may be combined with each other.

The biosafety cabinet takes away aerosols formed by the contaminating test material by the circulating air to protect the operator from exposure risks. The biological safety cabinet is provided with a fan and a high-efficiency filter. The high-efficiency filter is a core component of the biosafety cabinet and is mainly used for trapping particle dust with the particle size of more than 0.5 mu m and various suspended matters. The high-efficiency filter is generally made of superfine glass fiber paper as a filter material, folded materials such as cardboard paper, aluminum foil plates and the like as a partition plate, sealed by novel polyurethane sealant, and made of galvanized plates, stainless steel plates and aluminum alloy profiles as outer frames. The cost of the high-efficiency filter is high, and the high-efficiency filter is difficult to replace. For the animal secondary biosafety cabinet, the animal can generate some impurities with larger particles such as falling hairs, fragments and the like in the experimental process of the operation space. These impurities adhere to the high efficiency filter along with the air flow, which shortens the replacement period of the high efficiency filter.

In order to extend the replacement cycle of the high-efficiency filter, and better achieve primary filtration of larger particulate impurities, and as shown in fig. 1-7, embodiments of the present disclosure provide a biosafety cabinet, including a case, a diaphragm 170, a vertical diaphragm 180, an operation panel 200, and a prefilter 300, wherein the case is configured with a receiving space; the diaphragm 170 divides the accommodating space into a filtering space and an operating space, and the rear end of the diaphragm 170 is spaced from the back plate 160 of the case by a preset distance; the vertical partition plate 180 is arranged in the operation space, the top end of the vertical partition plate 180 is in butt joint with the rear end of the transverse partition plate 170, and the vertical partition plate 180 and the backboard 160 of the box body form a first interlayer; the operation table 200 is transversely arranged in the operation space, the rear end of the operation table 200 is in butt joint with the bottom end of the vertical partition plate 180 and forms a second interlayer with the bottom plate 120 of the operation space, and the second interlayer is communicated with the first interlayer; the prefilter 300 is disposed below the console 200, and filters air entering the first interlayer.

In the disclosed embodiment, the housing of the biosafety cabinet includes a top panel 110, a bottom panel 120, a left side panel, a right side panel 140, a front panel 150, and a back panel 160. The diaphragm 170 is transversely arranged in the box body, the accommodating space of the biosafety cabinet is divided into a filtering space and an operating space, and the filtering space is positioned above the operating space. The operation space is provided with an operation window, and the operation window is provided with a front panel 150 for extending a hand into the operation space through the operation window to perform operations such as sampling and sample moving on biological samples. The front end of the diaphragm 170 is abutted against the front panel 150 of the case, the left and right ends are respectively abutted against the left and right side plates 140, and the rear end is spaced apart from the back panel 160 of the case by a predetermined distance. The vertical partition plate 180 is vertically arranged, the top end is in butt joint with the rear end of the diaphragm plate 170, the left end and the right end are respectively in butt joint with the left side plate and the right side plate 140, and the bottom end is at a preset distance from the bottom plate 120 of the box body. An operation table 200 is arranged in the operation space, the operation table 200 is transversely arranged, the front end of the operation table is abutted against the front panel 150 of the box body, the left end and the right end of the operation table are respectively abutted against the left side plate and the right side plate 140, and the rear end of the operation table is abutted against the bottom end of the vertical partition plate 180. The floor 120 of the operating space, i.e. the floor 120 of the cabinet, and the back panel 160 of the operating space, i.e. the back panel 160 of the cabinet. The operation panel 200 forms a second interlayer with the bottom plate 120 of the operation space, and the vertical partition 180 forms a second interlayer with the back plate 160 of the operation space. The operation table 200 is provided with a vent hole, and air in the operation space enters the second interlayer through the vent hole and then enters the filtering space through the first interlayer. The air is filtered after entering the filter space and then returned to the operating space or discharged to the environment in which the biosafety cabinet is located. A prefilter 300 is disposed below the console 200, and air in the operation space flows through the prefilter 300 after entering the second interlayer through the vent holes of the console 200. Larger impurities such as hair debris in the air are adsorbed by the prefilter 300.

With the biosafety cabinet provided by the embodiments of the present disclosure, the prefilter 300 is laterally disposed, and the filtering area is not limited by the distance between the console 200 and the bottom plate 120 of the box, and the length-width dimension of the filter can be maximally close to the length-width dimension of the bottom plate 120 of the operation space. Because the prefilter 300 has a larger filtering area and smaller wind resistance, the ventilation efficiency of air can be improved; the prefilter 300 has a large filtering area, is not easily clogged with hair debris, and has a long replacement cycle.

Optionally, the inner wall of the first interlayer is transversely configured with a blocking edge, the prefilter 300 is lapped on the blocking edge, and the prefilter 300 is at a preset distance from the console 200 and at a preset distance from the bottom plate 120 of the operation space.

The rims are used to provide mounting positions for the prefilter 300 and to be spaced a predetermined distance from the floor 120 of the operating space of the console 200, respectively. The prefilter 300 divides the space within the second interlayer into an upper space and a lower space. Air in the operation space enters the upper space of the interlayer through the vent holes of the operation table 200, and then enters the lower space of the interlayer after being filtered by the prefilter 300. Above and below the prefilter 300 are an upper space and a lower space, respectively, and air passes through the prefilter 300 from top to bottom when flowing through the prefilter 300, and the prefilter 300 may have a large effective filtering area, thereby reducing wind resistance of the prefilter 300 and improving filtering capability of the prefilter 300. A blocking edge is provided to facilitate the installation and fixation of the prefilter 300.

Optionally, the blocking edge includes a first blocking edge 410 and a second blocking edge 420, the first blocking edge 410 is located at a front end of the second interlayer, and the second blocking edge 420 is located at a rear end of the second interlayer.

The front end of the first interlayer is one end close to the operation window, and the rear end is one end close to the back plate 160 of the box body. With this arrangement, the first stop edge 410 and the second stop edge 420 are disposed opposite to each other, and thus the prefilter 300 can be better fixed.

Optionally, the bottom end of the vertical partition 180 is bent outward to form the second stop edge 420 described above.

The bottom end of the vertical partition plate 180 is bent, so that the supporting effect of the vertical partition plate 180 on the left side plate and the right side plate 140 can be improved, and the structural strength of the biosafety cabinet is improved. In addition, the second blocking edge 420 is formed by bending the bottom end of the vertical partition 180, so that the manufacturing process of the blocking edge can be simplified, and the cost of the biosafety cabinet can be reduced.

Optionally, the bottom plate 120 of the box is bent upward to form the first stop edge 410.

After the bottom plate 120 of the box body is bent upwards, a better supporting effect can be achieved on the left side plate and the right side plate 140 of the box body. The bottom plate 120 of the box body is bent upwards to form the first blocking edge 410, so that the manufacturing process of the blocking edge can be simplified, and the cost of the biosafety cabinet is reduced.

Optionally, a first air inlet is formed at the front end of the operation console 200, and a second air inlet is formed at the rear end of the operation console 200.

The front end of the console 200 is the end near the operation window, and the rear end is the end near the vertical partition 180. When the biosafety cabinet operates, the filtering space generates negative pressure, and air in the operation space is sucked through the first interlayer and the second interlayer. When the air in the operation space flows to the filtering space, a part of the air enters the operation space through the operation window. Thus, the air nearby the operation space is sucked into the biosafety cabinet through the flowing air, and the aerosol of the operation air can be effectively prevented from escaping from the operation window. The first air inlet is formed in the front end of the operation box body, and air entering the operation space from the operation window more easily enters the second interlayer through the first air inlet. The rest of the air enters the second interlayer through the second air inlet at the rear end of the operation table 200. With this arrangement, air in the operation space can be made to enter the second interlayer in an orderly fashion in a laminar flow of a majority, and enter the filtration space through the prefilter 300 and the first interlayer. The air flows orderly, and the protection effect of the biosafety cabinet can be improved.

Optionally, the pre-filter 300 includes a plurality of filter units 310, and the plurality of filter units 310 are spliced.

The prefilter 300 includes a plurality of filter units 310 that are joined together, and when the prefilter 300 is required to be disassembled, the disassembly and assembly can be repeated a plurality of times by disassembling and assembling the individual filter units 310. With this arrangement, the user can operate the operation panel conveniently because the operation space, particularly, the space under the operation panel 200 is small. In addition, if cleaning, retort sterilization, etc. are to be performed after removing the prefilter 300, the single filter unit 310 is small in size, and the requirement for the size of the cleaning or sterilizing container is low, which facilitates the cleaning and sterilization of the prefilter 300 by the user.

Optionally, the prefilter 300 is divided into a plurality of filter units 310 along the length of the biosafety cabinet.

The direction of the left and right side plates 140 of the biosafety cabinet is the length direction of the biosafety cabinet, the direction from the front panel 150 to the back panel 160 is the width direction of the biosafety cabinet, and the direction from the top panel 110 to the bottom panel 120 is the height direction of the biosafety cabinet. The prefilter 300 is in the form of a plurality of filter units 310 spliced together, and as an embodiment, a plurality of filter units 310 are spliced together along the length of the biosafety cabinet. That is, the dimension of the filter unit 310 in the width direction of the biosafety cabinet is equal to the dimension of the filter unit 310 in the width direction of the biosafety cabinet, and the sum of the dimensions of the plurality of filter units 310 in the length direction of the biosafety cabinet is equal to the dimension of the prefilter 300 in the length direction of the biosafety cabinet. For the biosafety cabinet, the dimension in the length direction is generally larger than the dimension in the width direction, and by adopting the arrangement mode, the length-width dimension difference of the filtering unit 310 is smaller, so that the filtering unit 310 is convenient to store, transport and disassemble.

Optionally, the filtering unit 310 includes a frame 311, a sealing strip 312, and a filtering material 313, wherein the frame 311 encloses a mounting space; the sealing strip 312 is attached to one surface of the frame 311 outwards along the circumferential direction of the frame 311; the filter 313 is disposed in the installation space.

The filter unit 310 includes a frame 311, the frame 311 is used for keeping the filter unit 310 in a certain shape and having a certain structural strength, the frame 311 encloses a mounting space, and the filter material 313 is disposed in the mounting space. Illustratively, the filter material 313 is a primary filter cotton. The primary filter cotton has strong catching capability on hair scraps and small wind resistance. The sealing strips 312 are attached to the outer surface of the frame 311 along the circumferential direction of the frame 311, and when the plurality of filter units 310 are spliced, gaps are not formed between the adjacent filter units 310 and between the filter units 310 and the blocking edge, so that the filtering effect of the prefilter 300 can be further enhanced.

Optionally, the filter unit 310 further includes a first grating plate 314, the first grating plate 314 being fixed to the frame 311, the first grating plate 314 being for supporting the filter material 313.

Each side of the first grating plate 314 is fixed to an inner wall of the frame 311, and defines an installation space together with the frame 311. The filter material 313 is placed within the frame above the first grid plate 314. With such an arrangement, the structural strength of the prefilter 300 can be further improved, avoiding shifting or dislodging of the filter material 313.

Optionally, the filter unit 310 further includes a second grating plate 315, the second grating plate 315 is fixed to the frame 311, and the first grating plate 314 and the second grating plate 315 jointly clamp the filter material 313.

The second grating plate 315 is disposed opposite the first grating plate 314, and the filter material 313 is located between the first grating plate 314 and the second grating plate 315. With this arrangement, the filter material 313 can be kept in a certain shape better, and the filtering uniformity of the prefilter 300 can be improved. The second grid plate 315 is provided, so that the integrity of the filtering unit 310 is better, and the filtering unit 310 is convenient to assemble and disassemble.

Optionally, the second grid plate 315 is detachably fixed to the frame 311.

When it is necessary to clean the prefilter 300, the second grid plate 315 of the filter unit 310 is removed and the filter material 313 is then removed. After the filter unit 310 is cleaned and sterilized, a new filter material 313 is filled and a second grid plate 315 is installed. With such an arrangement, only the filter material 313 is used as a consumable, and the filter unit 310 can be reused by replacing the filter material 313. This can effectively reduce the cost of use of the prefilter 300.

Alternatively, two adjacent filter units 310 are outwardly extended with protrusions 316 at the abutting position, and the other is configured with grooves, and the two adjacent filter units 310 are inserted through the grooves and the protrusions 316.

With such an arrangement, two adjacent filter units 310 partially overlap in the horizontal direction, so that a gap between the two adjacent filter units 310 can be further reduced, thereby improving the filtering effect of the prefilter 300.

Optionally, the diaphragm 170 is provided with an air return port, and the biosafety cabinet further includes a first filter 510, a first fan box 520 and a first fan 530, wherein the first filter 510 is disposed at the air return port; a first fan case 520 covering the return air inlet and covering the first filter 510; the first fan 530 is disposed in the first fan housing 520, and is used for driving the air in the filtering space to flow to the operation space through the first fan housing 520 and the first filter 510.

The diaphragm 170 is provided with an air return opening, and the first filter 510 is disposed at the air return opening and is used for filtering air flowing through the air return opening. The first filter 510 is a high efficiency filter. The first fan case 520 is disposed at the return air inlet and covers the first filter 510. The bottom of the first fan case 520 is open to cover the first filter 510, and the first fan case 520 is also provided with an air inlet. The first fan 530 is disposed in the first fan case 520, and drives air in the filtering space to enter the first fan case 520 from the air inlet of the first fan case 520, and then to return to the operating space through the air return inlet after being filtered by the first filter 510. By adopting the arrangement mode, partial air inside the biosafety cabinet circularly flows, the whole air inlet quantity and the whole air outlet quantity of the biosafety cabinet can be reduced, and the influence on the environment where the biosafety cabinet is positioned is reduced while the biosafety cabinet plays a role in biosafety for a user.

Optionally, the top plate 110 of the box body is provided with an air outlet, and the biosafety cabinet further comprises a second filter 610, a second fan case 620 and a second fan 630, wherein the second filter 610 is arranged at the air outlet; a second fan case 620 covering the exhaust port and covering the second filter 610; the second fan 630 is disposed in the second fan case 620, and is used for driving the air in the filtering space to be discharged through the second fan case 620 and the second filter 610.

The top plate 110 of the box body is provided with an air outlet, and the second filter 610 is arranged at the air outlet. The second filter 610 is a high efficiency filter. The second fan case 620 is disposed at the exhaust port and covers the second filter 610. The top of the second fan case 620 is opened to cover the second filter 610, and the second fan case 620 is opened with an air inlet. The second fan 630 is disposed in the second fan case 620, and drives air in the filtering space to enter the second fan case 620 from the air inlet of the second fan case 620, and then is filtered by the second filter 610 and then discharged to the environment where the biosafety cabinet is located through the air outlet. The second fan 630 drives a portion of the air to be exhausted to the environment of the biosafety cabinet, and the same volume of air can enter the operating space through the operating window. By adopting the arrangement form, the operation space can always flow in from the position of the operation window, so that the escape of aerosol in the operation space is avoided, and the protection effect of the biosafety cabinet on a user is improved.

And moves downward toward the console 200 from the return air inlet back to the operating space at a reduced flow rate. The flow rate of the air entering the operation space from the operation window is the inflow wind speed. Control of the inflow wind speed and the falling wind speed may be achieved by adjusting the rotational speed of the first fan 530 and the rotational speed of the second fan 630. Specifically, the rotation speed of the second fan 630 is increased, more air is discharged from the air outlet, and the flow speed and the wind speed are increased; the rotation speed of the first fan 530 is increased, the air returned from the return air inlet to the operation space is increased, and the wind speed is lowered. By adopting the arrangement mode, the flow speed and the wind speed of the operation space can be accurately controlled, so that the biological safety cabinet can achieve better protection effect.

Optionally, the biosafety cabinet further comprises a flow equalizing plate, wherein the flow equalizing plate is arranged in the operation space and is positioned below the air return opening.

The flow equalizing plate is provided with a plurality of flow equalizing holes, and the air blown to the flow equalizing plate flows through the plurality of flow equalizing holes and has uniform flow and speed distribution. The flow equalization plates are arranged, so that the air flow of the operation space is more orderly, and the protection effect of the biological safety cabinet is improved.

The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may include structural and other modifications. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. A biosafety cabinet comprising:

the box body is provided with an accommodating space;

the transverse partition plate is used for dividing the accommodating space into a filtering space and an operating space, and the rear end of the transverse partition plate is a preset distance away from the backboard of the box body;

the vertical partition plate is arranged in the operation space, the top end of the vertical partition plate is in butt joint with the rear end of the transverse partition plate, the bottom end of the vertical partition plate is a preset distance from the bottom plate of the accommodating space, and the vertical partition plate and the back plate of the box body form a first interlayer;

the operation table is transversely arranged in the operation space, the rear end of the operation table is in butt joint with the vertical partition plate, a second interlayer is formed between the operation table and the bottom plate of the operation space, and the second interlayer is communicated with the first interlayer;

the prefilter is transversely arranged below the operating platform and filters air entering the first interlayer.

2. The biosafety cabinet of claim 1 wherein the cabinet is configured to receive a signal from a user,

the prefilter comprises a plurality of filtering units, and the filtering units are spliced.

3. The biosafety cabinet of claim 2, wherein said filter unit includes:

the frame encloses and defines an installation space;

the sealing strip is adhered to one surface of the frame outwards along the circumferential direction of the frame;

and the filter material is arranged in the installation space.

4. A biosafety cabinet according to claim 3, wherein said filter unit further comprises:

and the first grating plate is fixed on the frame and is used for supporting the filter material.

5. The biosafety cabinet of claim 4 wherein said filter unit further comprises:

and the second grating plate is fixed on the frame, and the first grating plate and the second grating plate jointly clamp the filter material.

6. The biosafety cabinet of claim 5 wherein the cabinet is configured to receive a signal from a user,

two adjacent filter units are provided with protrusions extending outwards at the abutting positions, and the other filter unit is provided with a groove, and the protrusions are inserted into the grooves so that the two adjacent filter units are spliced.

7. Biosafety cabinet according to any of claims 1-6, characterized in that,

the inner wall of the first interlayer is transversely provided with a baffle edge, the prefilter is lapped on the baffle edge, and the prefilter is away from the operation table by a preset distance and away from the bottom plate of the operation space by a preset distance.

8. The biosafety cabinet of claim 7 wherein the cabinet is configured to receive a signal from a user,

the front end of the operation table is provided with a first air inlet, and the rear end of the operation table is provided with a second air inlet.

9. The biosafety cabinet of claim 8 wherein the cabinet is configured to receive a signal from a user,

the diaphragm plate is provided with an air return opening,

the biosafety cabinet further comprises:

the first filter is arranged at the return air inlet;

the first fan case is covered on the return air inlet and covers the first filter;

the first fan is arranged in the first fan case and used for driving air in the filtering space to flow to the operating space through the first fan case and the first filter.

10. The biosafety cabinet of claim 9 wherein the cabinet is configured to receive a signal from a user,

an air outlet is arranged on the top plate of the box body,

the biosafety cabinet further comprises:

the second filter is arranged at the exhaust outlet;

the second fan case is covered on the exhaust outlet and covers the second filter;

the second fan is arranged in the second fan case and is used for driving air in the filtering space to enter the second fan case, and the air is filtered by the second filter and then is discharged through the air outlet.