Replaceable filtering device for biological safety cabinet

Abstract

The utility model relates to a replaceable filtering device for a biological safety cabinet, which comprises a shell, and a ventilation opening is formed in the shell; a sliding rail is fixedly arranged on the shell, a filter body is arranged on the sliding rail in a sliding mode, a plurality of through holes with openings facing the shell are formed in the filter body, the through holes are sequentially arranged in the axial direction of the sliding rail, and filters are arranged in the through holes. A sealing ring A extending around the through hole is fixedly arranged on the side, facing the shell, of the filtering body. The filtering body abuts against the shell through the sealing ring A. The motion trail of the sealing ring A covers the ventilation opening, and the inner diameter of the sealing ring A is larger than or equal to the aperture of the ventilation opening. A plurality of filters are simultaneously installed through the filter body, the filters are replaced through the sealing ring A in a sealing state, air leakage in the safety cabinet is prevented, meanwhile, the use efficiency of the safety cabinet is improved, and the safety cabinet is simple, efficient, safe and reliable.

Description

Technical Field

[0001] This utility model relates to the field of biosafety cabinet technology, and in particular to a replaceable filter device for biosafety cabinets. Background Technology

[0002] A biological safety cabinet (BSC) is a laboratory device specifically designed for handling and manipulating biological materials. It prevents the aerosol release of hazardous or unknown biological particles during experimental operations. The working principle of a biological safety cabinet is mainly to draw air out of the cabinet, maintaining a negative pressure state inside, and protecting personnel through vertical airflow. Outside air is filtered before entering the safety cabinet to avoid contamination of the processed samples. The air inside the cabinet is also filtered before being discharged into the atmosphere to avoid environmental pollution.

[0003] After prolonged use, the filtration efficiency of filters decreases, requiring timely replacement. However, the filters on existing biosafety cabinets are cumbersome to install and remove, and improper operation can lead to incomplete air filtration inside the cabinet, easily polluting the outside air and posing a certain hazard to personnel. In particular, when a biosafety cabinet in use needs filter replacement, the cabinet must be stopped and the air inside thoroughly purified before the filter can be replaced, severely impacting the efficiency of the equipment. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by providing a replaceable filter device for biosafety cabinets. This device allows for the simultaneous installation of multiple filters within a filter body, with the filters being replaced under sealed conditions via a sealing ring A. This prevents air leakage within the biosafety cabinet and increases its operational efficiency. The device is simple, efficient, safe, reliable, and easy to operate.

[0005] This utility model is achieved through the following technical solution: a replaceable filter device for a biosafety cabinet is provided, including a housing with a ventilation opening; a slide rail is fixedly mounted on the housing, and a filter body slides on the slide rail. The filter body has several through holes with openings facing the housing and arranged sequentially along the axial direction of the slide rail, and filters are installed in the through holes; a sealing ring A extending around the through holes is fixedly mounted on the side of the filter body facing the housing, and the filter body abuts against the housing through the sealing ring A; the movement trajectory of the sealing ring A covers the ventilation opening, and the inner diameter of the sealing ring A is greater than or equal to the diameter of the ventilation opening; multiple filters are installed simultaneously through the filter body, and the filters are replaced in a sealed state through the sealing ring A, preventing air leakage inside the biosafety cabinet and increasing the utilization efficiency of the biosafety cabinet.

[0006] As an optimization, a sealing ring B is fixed on the side of the filter facing the housing, and any through hole is located inside the sealing ring B, and the vent is always located inside the sealing ring B; by the sealing ring B always covering the vent and through hole, air inside the safety cabinet is prevented from leaking out through the gap between the sealing rings A.

[0007] As an optimization, a slider is slidably mounted on the slide rail, and a guide rod extending toward the housing is fixed on the slider; a sliding hole adapted to the guide rod is opened on the filter body, and the end of the guide rod away from the slider passes through the compression spring and slides in the sliding hole; the slider, guide rod and compression spring ensure that the sealing ring A is always in contact with the housing, preventing the air in the safety cabinet from leaking between the sealing ring A and the housing due to wear of the sealing ring A.

[0008] As an optimization, a slide rod extending toward the filter body is fixed on the housing, a return spring is sleeved on the slide rod, and a limiting block is slidably provided at the end of the slide rod away from the housing; the filter body is provided with several limiting grooves that are adapted to the limiting blocks, and the movement trajectory of the limiting blocks and the movement trajectory of the limiting grooves intersect; the filter body is limited by the slide rod, return spring, limiting block and limiting grooves to prevent the filter from sliding and causing air leakage in the safety cabinet.

[0009] The beneficial effects of this utility model are as follows: By simultaneously installing multiple filters on the filter body, and replacing the filters in a sealed state using sealing ring A, air leakage inside the safety cabinet is prevented, while increasing the utilization efficiency of the safety cabinet; by ensuring that sealing ring B always covers the vents and through holes, air inside the safety cabinet is prevented from leaking out through the gaps between sealing rings A; by using a slider, guide rod, and compression spring, sealing ring A is always in contact with the filter body, preventing air leakage from between sealing ring A and the shell due to wear of sealing ring A; and by using a sliding rod, return spring, limit block, and limit groove to limit the filter body, preventing air leakage inside the safety cabinet caused by the filter body sliding. Attached Figure Description

[0010] Figure 1 This is a cross-sectional view (front view) of the present invention.

[0011] Figure 2 This is a cross-sectional view (side view) of the present invention.

[0012] Figure 3 This is a cross-sectional view (top view) of the present invention.

[0013] Figure 4 for Figure 3 A schematic diagram of the structure at point A;

[0014] Figure 5 This is a schematic diagram of the structure of sealing ring A and sealing ring B in this utility model;

[0015] As shown in the figure:

[0016] 1. Housing, 2. Fan, 3. Slide rail, 4. Slider, 5. Filter body, 6. Filter, 7. Sealing ring A, 8. Sealing ring B, 9. Guide rod, 10. Compression spring, 11. Slide rod, 12. Return spring, 13. Limiting block, 14. Sealing ring, 101. Vent, 401. Limiting groove. Detailed Implementation

[0017] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0018] like Figure 1 , Figure 2 and Figure 3 The replaceable filter device for a biosafety cabinet of this utility model includes a housing 1 with a vent 101. A slide rail 3 is fixedly mounted on the housing 1, and a filter body 5 slides on the slide rail 3. The filter body 5 has several through holes with openings facing the housing 1 and arranged sequentially along the axial direction of the slide rail 3. A filter 6 is installed in each of the through holes. A sealing ring A7 extending around the through hole is fixedly mounted on the side of the filter body 5 facing the housing 1. The filter body 5 abuts against the housing 1 through the sealing ring A7. The movement trajectory of the sealing ring A7 covers the vent 101, and the inner diameter of the sealing ring A7 is greater than or equal to the aperture of the vent 101.

[0019] The housing 1 has a groove, the vent 101 is located in the groove, and the vent 101 is connected to the air inlet or air outlet of the fan 2; the slide rail 3 is located in the groove and extends horizontally; the axis of the through hole is perpendicular to the housing 1; a number of sealing rings 14 extending circumferentially along the through hole are provided in the through hole, and the sealing rings 14 are fitted on the filter 6 and abut against the filter 6.

[0020] Install the new filter 6 into the through hole of the filter body 5, push the filter body 5, and the filter body 5 will cause the old and new filters 6 and the sealing ring A7 to slide on the slide rail 3. The sealing ring A7 corresponding to the old filter 6 will gradually move away from the vent 101, while any sealing ring A7 will always be in contact with the housing 1, until the sealing ring A7 corresponding to the new filter 6 completely covers the vent 101, the vent 101 and the through hole where the old filter 6 is located are disconnected, and the vent 101 and the through hole where the new filter 6 is located are connected; remove the old filter 6 from the filter body 5.

[0021] like Figure 1 , Figure 2 and Figure 5 The filter body 5 shown is fixed with a sealing ring B8 on the side facing the housing 1. Any through hole is located inside the sealing ring B8, and the vent 101 is always located inside the sealing ring B8; any sealing ring A7 is located inside the sealing ring B8.

[0022] Push the filter body 5, and the filter body 5 will cause the old and new filters 6, sealing ring A7 and sealing ring B8 to slide on the slide rail 3. The sealing ring A7 corresponding to the old filter 6 will gradually move away from the vent 101. At the same time, the sealing ring A7 and sealing ring B8 will always be in contact with the housing 1, and the sealing ring B8 will always cover the vent 101 and the through hole until the sealing ring A7 corresponding to the new filter 6 completely covers the vent 101.

[0023] like Figure 2 A slider 4 is slidably mounted on the slide rail 3 shown. A guide rod 9 extending toward the housing 1 is fixed on the slider 4. A sliding hole adapted to the guide rod 9 is opened on the filter body 5. The end of the guide rod 9 away from the slider 4 passes through the compression spring 10 and slides in the sliding hole. The axis of the guide rod 9 and the axis of the through hole are parallel to each other.

[0024] Push slider 4, which causes filter body 5, new and old filters 6, sealing ring A7 and sealing ring B8 to slide on slide rail 3; compression spring 10 applies a certain pushing force to filter body 5, and filter body 5 causes sealing ring A7 and sealing ring B8 to abut against housing 1.

[0025] like Figure 2 , Figure 3 and Figure 4 The housing 1 shown is fixed with a slide rod 11 extending toward the filter body 5. A return spring 12 is sleeved on the slide rod 11, and a limiting block 13 is slidably provided at the end of the slide rod 11 away from the housing 1. The filter body 5 is provided with a plurality of limiting grooves 401 that are adapted to the limiting block 13, and the movement trajectory of the limiting block 13 intersects the movement trajectory of the limiting groove 401. The axis of the slide rod 11 is perpendicular to the axis of the slide rail 3, and the slide rod 11 is perpendicular to the filter body 5. The limiting groove 401 is located on the slider 4.

[0026] Push the slider 4, the limiting block 13 disengages from the limiting groove 401 and slides on the slide rod 11, and the return spring 12 contracts; until the limiting block 13 reaches the position corresponding to the next limiting groove 401, the return spring 12 relaxes and drives the limiting block 13 to slide on the slide rod 11, and the limiting block 13 enters the limiting groove 401.

[0027] In actual production, the new filter 6 is installed in the through hole of the filter body 5, pushing the slider 4, the limiting block 13 disengages from the limiting groove 401 and slides on the slide rod 11, and the return spring 12 retracts; the slider 4 drives the filter body 5, the new and old filters 6, the sealing ring A7 and the sealing ring B8 to slide on the slide rail 3; the compression spring 10 applies a certain pushing force to the filter body 5, and the filter body 5 drives the sealing ring A7 and the sealing ring B8 to abut against the housing 1; the sealing ring A7 corresponding to the old filter 6 gradually moves away from the vent 101, while the sealing ring A7 and the sealing ring B8... 8 is always in contact with the housing 1, and the sealing ring B8 always covers the vent 101 and the through hole; until the limiting block 13 reaches the position corresponding to the next limiting groove 401, the return spring 12 relaxes and drives the limiting block 13 to slide on the slide rod 11, the limiting block 13 enters the limiting groove 401, and at the same time, the sealing ring A7 corresponding to the new filter 6 completely covers the vent 101; the vent 101 and the through hole where the old filter 6 is located are disconnected, and the vent 101 and the through hole where the new filter 6 is located are connected; the old filter 6 is removed from the filter body 5.

[0028] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A replaceable filter device for a biosafety cabinet, comprising a housing (1) having a vent (101) on the housing (1); characterized in that: A slide rail (3) is fixed on the housing (1), and a filter body (5) is slidably mounted on the slide rail (3). The filter body (5) has several through holes with openings facing the housing (1) and arranged sequentially along the axial direction of the slide rail (3). A filter (6) is provided in the through holes. A sealing ring A (7) extending around the through hole is fixed on the side of the filter body (5) facing the housing (1). The filter body (5) abuts against the housing (1) through the sealing ring A (7). The movement trajectory of the sealing ring A (7) covers the vent (101), and the inner diameter of the sealing ring A (7) is greater than or equal to the aperture of the vent (101).

2. The replaceable filter device for a biosafety cabinet according to claim 1, characterized in that: The filter body (5) is fixed with a sealing ring B (8) on the side facing the housing (1), and any through hole is located inside the sealing ring B (8), and the vent (101) is always located inside the sealing ring B (8).

3. The replaceable filter device for a biosafety cabinet according to claim 1, characterized in that: A slider (4) is slidably mounted on the slide rail (3), and a guide rod (9) extending toward the housing (1) is fixed on the slider (4); a sliding hole adapted to the guide rod (9) is opened on the filter body (5), and the end of the guide rod (9) away from the slider (4) passes through the compression spring (10) and slides in the sliding hole.

4. The replaceable filter device for a biosafety cabinet according to claim 1, characterized in that: A slide rod (11) extending toward the filter body (5) is fixed on the housing (1). A return spring (12) is sleeved on the slide rod (11), and a limiting block (13) is slidably provided at one end of the slide rod (11) away from the housing (1). Several limiting grooves (401) adapted to the limiting block (13) are opened on the filter body (5), and the movement trajectory of the limiting block (13) and the movement trajectory of the limiting groove (401) intersect.

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