Air supply device and biological safety cabinet

Abstract

The utility model relates to the technical field of biosafety cabinets, in particular to an air supply device and a biosafety cabinet, the air supply device comprises a static pressure box, a filter plate and a first fan, the static pressure box comprises a box body, the lower end of the box body is provided with a downward air outlet, and the filter plate is connected to the lower end of the box body to block the air outlet; the first fan is fixed to the outer side of the box body, an air outlet of the first fan is communicated with an inner cavity of the box body, the air outlet faces the filter plate and is obliquely arranged downwards, the first fan is arranged on one side of the static pressure box, the total height of the air supply device is reduced, and the air outlet of the fan faces the filter plate and is obliquely arranged downwards. According to the filter plate, air blown out of the fan can be obliquely blown to the upper end face of the filter plate, compared with the mode that the air outlet is perpendicular to the filter plate, the direct contact area of the air blown out of the fan and the filter plate is increased through the obliquely-arranged air outlet, and the filtering efficiency of the filter plate is conveniently improved.

Description

Technical Field

[0001] This utility model relates to the field of biosafety cabinet technology, and in particular to an air supply device and a biosafety cabinet. Background Technology

[0002] A biosafety cabinet is a box-shaped, negative-pressure air-purifying safety device that prevents the aerosol release of hazardous or unknown biological particles during experimental procedures. It is widely used in research, teaching, clinical testing, and production in fields such as microbiology, biomedicine, genetic engineering, and biopharmaceuticals, and is the most basic safety protection equipment in the primary biosafety barrier of laboratories.

[0003] To ensure a stable clean airflow within the working space of a biosafety cabinet, an air supply device needs to be installed at the top of the cabinet. Existing air supply devices typically include a fan, a plenum chamber with an outlet at the bottom, and filter plates installed at the outlet. The fan is usually located on top of the plenum chamber, with its opening facing downwards and directly opposite the filter plates. However, placing the fan on top of the plenum chamber results in a relatively high overall height for the air supply device, which in turn increases the overall height of the biosafety cabinet. For biosafety cabinets with internal automatic detection equipment, a higher cabinet height is already necessary. If the air supply device is also high, the overall height of the biosafety cabinet will be significantly increased, leading to higher requirements for the building height in the installation area, which hinders the widespread adoption of biosafety cabinets. Utility Model Content

[0004] The technical problem this invention aims to solve is that the existing air supply device's fan is located at the top of the static pressure box, resulting in a relatively high air supply device. This leads to a relatively high overall height of the biosafety cabinet, which in turn requires a high building height for the installation area, hindering the widespread adoption of biosafety cabinets.

[0005] To solve the above-mentioned technical problems, the purpose of this utility model is to provide an air supply device, comprising:

[0006] A static pressure chamber, the static pressure chamber comprising a chamber body, the lower end of the chamber body having a downward-facing air outlet;

[0007] A filter plate is connected to the lower end of the housing to block the air outlet.

[0008] The first fan is fixed to the outside of the housing, and the air outlet of the first fan is connected to the inner cavity of the housing. The air outlet is arranged towards the filter plate and inclined downwards.

[0009] As a preferred embodiment, the lower periphery of the enclosure is provided with an outwardly extending flange; the outer side of the flange is used to connect to the inner wall of the biosafety cabinet.

[0010] As a preferred embodiment, the first fan is connected to the outside of the housing, and the first fan and the flange are arranged vertically at intervals. The first fan has an air inlet, which is arranged downwards.

[0011] As a preferred embodiment, the axial direction of the impeller of the first wind turbine is defined as the first direction, and the plane with the first direction as the normal is defined as the first plane. The angle between the first plane and the flange is greater than or equal to 5° and less than or equal to 10°.

[0012] As a preferred embodiment, the side walls of the housing are arranged at an angle, and the first fan is vertically fixed to the outside of the housing wall.

[0013] As a preferred embodiment, at least two handles are fixed at horizontal intervals at the upper end of the flange.

[0014] As a preferred embodiment, the air outlet of the first fan is provided with a funnel-shaped diffuser structure.

[0015] As a preferred embodiment, the air supply device further includes a second fan, with the first fan and the second fan symmetrically arranged on opposite sides of the housing.

[0016] As a preferred embodiment, the first fan and the second fan form a set of fans, and multiple sets of fans are spaced apart on the outer side of the housing.

[0017] A biosafety cabinet includes the aforementioned air supply device.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] The air supply device of this utility model includes a static pressure box, a filter plate, and a first fan. The static pressure box includes a box body with a downward-facing air outlet at the lower end. The filter plate is connected to the lower end of the box body to block the air outlet. The first fan is fixed to the outside of the box body, and the air outlet of the first fan is connected to the inner cavity of the box body. The air outlet is inclined downward towards the filter plate. The first fan is located on one side of the static pressure box, which reduces the overall height of the air supply device, thereby reducing the overall height of the biosafety cabinet using the air supply device of this utility model, which facilitates the promotion of biosafety cabinets. Moreover, the air outlet of the fan is inclined downward towards the filter plate, which allows the air blown by the fan to be obliquely blown towards the upper surface of the filter plate. The air outlet is perpendicular to the filter plate relative to the air outlet. The inclined air outlet increases the direct contact area between the air blown by the fan and the filter plate, which helps to improve the filtration efficiency of the filter plate. Attached Figure Description

[0020] Figure 1 This is a front view of the air supply device of this utility model;

[0021] Figure 2This is a top view of the air supply device of this utility model;

[0022] Figure 3 This is a test diagram of the air supply device of this utility model;

[0023] Figure 4 This is a top view of the static pressure box of the air supply device of this utility model;

[0024] Figure 5 This is an isometric view of the air supply device of this utility model;

[0025] In the diagram, 1 is the static pressure box, 11 is the box body, 12 is the flange, 2 is the filter plate, 31 is the first fan, 311 is the air inlet, 32 is the second fan, and 4 is the handle. Detailed Implementation

[0026] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0027] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," "right," "top," and "bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. It should be understood that the terms "first," "second," etc., are used in this utility model to describe various information, but this information should not be limited to these terms; these terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this utility model, "first" information can also be called "second" information, and similarly, "second" information can also be called "first" information.

[0028] like Figures 1 to 5 As shown, a preferred embodiment of the air supply device of this utility model includes a static pressure box 1, a filter plate 2, and a first fan 31. The static pressure box 1 includes a box body 11, with a downward-facing air outlet at the lower end of the box body 11. The filter plate 2 is connected to the lower end of the box body 11 to block the air outlet. The first fan 31 is fixed to the outside of the box body 11, and the air outlet of the first fan 31 communicates with the inner cavity of the box body 11. The air outlet is inclined downward towards the filter plate 2. The first fan 31 is located on one side of the static pressure box 1, which reduces the overall height of the air supply device. Moreover, the air outlet of the fan is inclined downward towards the filter plate 2, which allows the air blown from the first fan 31 to be obliquely blown towards the upper surface of the filter plate 2. The air outlet is perpendicular to the filter plate 2 relative to the air outlet. The inclined air outlet increases the direct contact area between the air blown by the first fan 31 and the filter plate 2, which facilitates the improvement of the filtration efficiency of the filter plate 2.

[0029] To facilitate the installation of the air supply device, in this embodiment, the lower periphery of the housing 11 is provided with an outwardly extending flange 12; the outer side of the flange 12 is used to connect to the inner wall of the biosafety cabinet. Specifically, the outer contour of the flange 12 matches the inner contour of the cabinet, and the air supply device can be installed by connecting the periphery of the flange 12 to the inner wall of the cabinet. Moreover, the flange 12 and the housing 11 can divide the internal space of the cabinet into an upper space and a lower space, with the lower space serving as the working space of the biosafety cabinet and the upper space used for return air.

[0030] In this embodiment, the housing 11 and the flange 12 are integrally stamped from metal sheet. In the gas embodiment of this utility model, the housing 11 and the flange 12 can be processed separately, and the flange 12 can be welded to the lower end of the housing 11.

[0031] The first fan 31 is connected to the outside of the housing 11, and the first fan 31 and the flange 12 are arranged vertically at intervals. The air inlet 311 of the first fan 31 is arranged downwards. Specifically, the first fan 31 is a forward-curved fan. The air inlet 311 and the air outlet of the forward-curved fan are arranged perpendicularly, and the air inlet 311 is parallel to the axis of the fan impeller. The air outlet is perpendicular to the axis of the fan impeller. The outer contour of the fan is smaller in the direction along the axis of the impeller and larger in the direction perpendicular to the axis of the impeller. Arranging the air inlet 311 of the first fan 31 downwards makes the size of the first fan 31 smaller in the vertical direction, thereby making the overall height of the combination of the first fan 31 and the static pressure box 1 lower, and thus further reducing the height of the air supply device.

[0032] Specifically, the axial direction of the impeller of the first fan 31 is defined as the first direction, and the plane with the first direction as its normal is defined as the first plane. The angle between the first plane and the flange 12 is greater than or equal to 5° and less than or equal to 10°. If the angle between the first plane and the flange 12 is too large, the installation height of the first fan 31 in the vertical direction will increase, and the direct contact area between the air blown from the first fan 31 and the filter plate 2 will be reduced. If the angle between the first plane and the flange 12 is too small, the space between the air inlet 311 of the first fan 31 and the flange 12 will be small, which is not conducive to the air intake of the first fan 31. In this embodiment, the angle between the first plane and the flange 12 is set to be greater than or equal to 5° and less than or equal to 10°, which ensures both the air intake of the first fan 31 and the direct contact area between the air blown from the first fan 31 and the filter plate 2, and also ensures that the height of the air supply device is low enough.

[0033] The flange 12 can be connected to the cabinet by snap-fit ​​or screw connection. To facilitate the disassembly and assembly of the static pressure box 1, in this embodiment, at least two handles 4 are fixed horizontally at intervals at the upper end of the flange 12. When it is necessary to disassemble or assemble the static pressure box 1, the worker can lift the static pressure box 1 by holding the handles 4 or by using hooks or ropes to pull the two handles 4.

[0034] Furthermore, to facilitate the installation of the first fan 31, the walls of the housing 11 are arranged at an angle, with the angle between the housing wall and the flange 12 being greater than or equal to 80° and less than or equal to 85°. The first fan 31 is vertically fixed to the outside of the housing wall. This facilitates the connection of the first fan 31, and an opening perpendicular to the housing wall can be made to connect it to the air outlet of the first fan 31, ensuring a good seal between the first fan 31 and the housing wall.

[0035] To further improve the diffusion of the air blown by the first fan 31 within the static pressure box 1 and ensure a uniform distribution of the inward airflow, in this embodiment, the air outlet of the first fan 31 is provided with a funnel-shaped diffusion structure. In this embodiment, the diffusion angle of the air outlet of the first fan 31 is 10°.

[0036] To improve ventilation efficiency and make the airflow distribution within the static pressure box 1 more uniform, in this embodiment, the air supply device further includes a second fan 32. The first fan 31 and the second fan 32 are symmetrically arranged on opposite sides of the box 11. Specifically, the structure of the second fan 32 is the same as that of the first fan 31, and the arrangement of the second fan 32 is symmetrical to that of the first fan 31.

[0037] In this embodiment, taking the arrangement of the first fan 31 on the left side of the housing 11 and the second fan 32 on the right side of the housing 11 as an example, the technical effects achievable by the arrangement of the first fan 31 and the second fan 32 are explained in detail. Specifically, the air outlet of the first fan 31 faces the lower right, so that the air blown by the first fan 31 can directly blow onto the right half of the filter plate 2, and the contact area between the air blown by the first fan 31 and the filter plate 2 is large. The air outlet of the second fan 32 faces the lower left, so that the air blown by the second fan 32 can directly blow onto the left half of the filter plate 2, and the direct contact area between the air blown by the second fan 32 and the filter plate 2 is also large.

[0038] Furthermore, the first fan 31 and the second fan 32 form a set of fans, and multiple sets of fans are spaced apart on the outer side of the housing 11. Specifically, in this embodiment, two sets of fans are provided, and the two sets of fans are respectively arranged at the four corners of the housing 11, thereby ensuring that the gas distribution in the static pressure box 1 is uniform.

[0039] One embodiment of a biosafety cabinet includes the aforementioned air supply device.

[0040] In summary, the air supply device of this utility model includes a static pressure box 1, a filter plate 2, and a first fan 31. The static pressure box 1 includes a box body 11, and the lower end of the box body 11 has a downward-facing air outlet. The filter plate 2 is connected to the lower end of the box body 11 to block the air outlet. The first fan 31 is fixed on the outside of the box body 11, and the air outlet of the first fan 31 is connected to the inner cavity of the box body 11. The air outlet is inclined downward towards the filter plate 2. The first fan 31 is set on one side of the static pressure box 1, which reduces the overall height of the air supply device. Moreover, the air outlet of the fan is inclined downward towards the filter plate 2, which allows the air blown out by the fan to be obliquely blown towards the upper surface of the filter plate 2. The air outlet is perpendicular to the filter plate 2 relative to the air outlet. The inclined air outlet increases the direct contact area between the air blown out by the fan and the filter plate 2, which facilitates the improvement of the filtration efficiency of the filter plate 2.

[0041] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. An air supply device, characterized in that, include: A static pressure box (1) includes a box body (11) with a downward-facing air outlet at the lower end of the box body (11). Filter plate (2), the filter plate (2) is connected to the lower end of the housing (11) to block the air outlet; The first fan (31) is fixed on the outside of the housing (11). The air outlet of the first fan (31) is connected to the inner cavity of the housing (11). The air outlet is arranged towards the filter plate (2) and inclined downward.

2. The air supply device according to claim 1, characterized in that, The lower periphery of the enclosure (11) is provided with an outwardly extending flange (12); the outer side of the flange (12) is used to connect to the inner wall of the biosafety cabinet.

3. The air supply device according to claim 2, characterized in that, The first fan (31) is connected to the outside of the housing (11), and the first fan (31) and the flange (12) are arranged vertically at intervals. The first fan (31) has an air inlet (311) which is arranged downwards.

4. The air supply device according to claim 3, characterized in that, The axial direction of the impeller of the first fan (31) is defined as the first direction, and the plane with the first direction as the normal is defined as the first plane. The angle between the first plane and the flange (12) is greater than or equal to 5° and less than or equal to 10°.

5. The air supply device according to claim 3, characterized in that, The side walls of the housing (11) are arranged at an angle, and the first fan (31) is vertically fixed to the outside of the housing wall of the housing (11).

6. The air supply device according to claim 2, characterized in that, At least two handles (4) are fixed at horizontal intervals at the upper end of the flange (12).

7. The air supply device according to claim 1, characterized in that, The air outlet of the first fan (31) is provided with a funnel-shaped diffuser structure.

8. The air supply device according to any one of claims 1 to 7, characterized in that, The air supply device also includes a second fan (32), and the first fan (31) and the second fan (32) are symmetrically arranged on opposite sides of the housing (11).

9. The air supply device according to claim 8, characterized in that, The first fan (31) and the second fan (32) form a set of fans, and multiple sets of fans are spaced apart on the outer side of the housing (11).

10. A biosafety cabinet, characterized in that, Includes the air supply device as described in any one of claims 1 to 9.

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