A biosafety cabinet air flow filter device

Abstract

The present invention provides an air flow filter device for a biological safety cabinet, which relates to the field of air filtering equipment and comprises an air duct housing, wherein foldable filter screens are fixedly installed on the left and right sides of the inner wall of the air duct housing, wherein the foldable filter screens are formed by connecting a plurality of W-shaped filter screens, and a V-shaped connecting end is provided at the connection between two adjacent W-shaped filter screens on the left and right sides, and wedge blocks are provided on the inner sides of the V-shaped connecting ends on the left and right sides, and the wedge blocks drive the V-shaped connecting ends on the left and right sides to move left and right. When the wedge blocks on the left and right sides move relative to each other, they can drive the V-shaped connecting ends in contact with them to move relative to each other, so that the angle of the V-shaped connecting ends changes, thereby expanding or contracting each W-shaped filter screen, thereby changing the projected area of ​​each W-shaped filter screen and the air flow in the air duct housing, and adjusting the filtering efficiency of the foldable filter screen.

Description

Technical Field

[0001] The present invention relates to the field of air filtering equipment, in particular to an airflow filtering device for a biological safety cabinet. Background Art

[0002] Biological safety cabinets are designed to protect operators, the laboratory environment, and experimental materials when operating infectious experimental materials such as primary cultures, bacterial strains, and diagnostic specimens, so as to avoid exposure to infectious aerosols and splashes that may be generated during the above operations.

[0003] After searching, the existing patent (publication number: CN210522064U) discloses a biosafety cabinet filter bellows, including a box body, a fan, a lower filter plate, an upper filter plate and an isolation plate; the box body is provided with openings at the upper and lower ends, and the lower filter plate and the upper filter plate are respectively fixed at the two ends of the box body; the isolation plate is provided in the box body, and the isolation plate extends along the length direction of the box body, isolating the box body into an upper ventilation chamber and a lower ventilation chamber; the fan is fixed on the side of the box body, and the air outlet of the fan contacts the end face of the isolation plate, so that part of the air flow blown out from the fan enters the upper ventilation chamber, and the other part enters the lower ventilation chamber. The device filters the air entering the device by arranging a lower filter plate and an upper filter plate in the box body. In the process of realizing the utility model, the inventor found that the prior art has the following problems:

[0004] In the prior art, the gas in the device is filtered by setting up two upper and lower filter plates. However, in actual use, the flow rate of the gas that needs to be filtered in the device varies greatly in different usage scenarios. In the prior art, the projected area of ​​the filter plate and the flowing airflow is fixed, that is, the filtration efficiency of the device per unit time is relatively fixed, and the filtration efficiency of the filter plate cannot be adjusted according to the different gas flow rates in different usage scenarios. For this reason, we propose a biosafety cabinet airflow filtration device. Summary of the Invention

[0005] The purpose of the present invention is to solve the following problems existing in the prior art:

[0006] In order to solve the problems existing in the prior art, the present invention provides an air flow filtration device for a biological safety cabinet, comprising an air duct housing, wherein foldable filter screens are fixedly installed on the left and right sides of the inner wall of the air duct housing, and the foldable filter screens are formed by connecting multiple W-shaped filter screens. A V-shaped connecting end is provided at the connection between two adjacent W-shaped filter screens on the left and right, and wedge blocks are provided on the inner sides of the V-shaped connecting ends on the left and right sides, and the wedge blocks drive the V-shaped connecting ends on the left and right sides to move left and right.

[0007] Preferably, a sliding block 1 is fixedly installed on the lower end of the outer wall of the two wedge blocks, a connecting block is fixedly installed on the lower end of the left and right sides of the inner wall of the air duct shell, and a slide rail frame is fixedly installed on the opposite sides of the inner wall of the left and right connecting blocks, and the two sliding blocks 1 are slidably connected to the inner wall of the slide rail frame.

[0008] Preferably, the inner walls of the left and right connecting blocks are rotatably connected to a screw at the rear end of the sliding rail frame, the thread directions of the left and right sides of the screw are opposite, and the outer wall of the screw is symmetrically threaded with a sliding block 2 on the left and right sides, and the lower ends of the outer walls of the two sliding blocks 2 are fixedly installed with an N-type connecting rod, and the front end of each N-type connecting rod is fixedly connected to the lower end of the outer wall of the sliding block 1 on the corresponding side.

[0009] Preferably, a bevel gear 1 is fixedly mounted on the middle portion of the outer wall of the screw.

[0010] The axle up and down groove at two ends embeds respectively in two guide rails up and down of being made up of the groove on the attachment piece, and the tooth on the attachment piece is meshed with tooth on upper sprocket wheel, the lower sprocket. The tooth on the attachment piece is meshed with tooth on upper sprocket.

[0011] Preferably, protective plates are symmetrically fixedly installed on the outer wall of the screw and on the left and right sides of the bevel gear.

[0012] Preferably, a winding drum is fixedly installed on the front section of the outer wall of the rotating shaft, an elastic rope is wound around the inner wall of the winding drum, a fixing rod is fixedly installed on the end of the elastic rope away from the winding drum, and the front end of the outer wall of the fixing rod is fixedly connected to the rear end of the outer wall of the air duct shell.

[0013] Preferably, connecting plates are fixedly installed on the left and right sides of the outer wall of the foldable filter, and the connecting plates are fixedly connected to the inner wall of the air duct housing.

[0014] The airflow filtration method based on the airflow filtration device of the biosafety cabinet comprises the following specific steps:

[0015] S1, a flow of air enters the air duct housing, and the flow of air drives the fan blades to rotate;

[0016] S2, when the fan blades rotate, they can drive the rotating shaft 1, the bevel gear 2, the bevel gear 2, the rotating shaft 2, the bevel gear 3, the bevel gear 3, the bevel gear 4 and the rotating shaft 3 to rotate. When the bevel gear 4 rotates, it can drive the bevel gear 1 to rotate, and finally make the bevel gear 1 rotate, so that the screw rotates, and the screw drives the two sliding blocks 2 thereon to perform relative motion;

[0017] S3, when the two sliding blocks 2 move, the two sliding blocks 1 can be driven by the N-shaped connecting rod to slide on the inner wall of the slide rail frame, so that the two wedge blocks move relative to each other;

[0018] S4. The fan blades can drive the winding drum to rotate when rotating, and the winding drum can wind and stretch the elastic rope when rotating. When the air flow velocity decreases or there is no air flow, the wound and stretched elastic rope will drive the winding drum to rotate in the opposite direction, so that the opening angle of the V-shaped connecting end is reduced, and the foldable filter is folded up.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) When the present invention is used, the wedge-shaped blocks on the left and right sides can drive the V-shaped connecting ends in contact with them to move relative to each other, so that the angle of the V-shaped connecting ends changes, thereby expanding or contracting each W-shaped filter, and then changing the projected area of ​​the air flow flowing in each W-shaped filter and the air duct housing, thereby adjusting the filtering efficiency of the foldable filter.

[0021] (2) When the present invention is used, when the flow air in the air duct housing passes through, it can drive the fan blades to rotate, so that the device can use the flow air in the air duct housing as a power to drive the two wedge blocks to move relative to each other, so that each W-shaped filter can be automatically unfolded when there is flow air passing through the device.

[0022] (3) When the present invention is used in practice, different airflow velocities in the air duct housing will cause the fan blades to rotate at different angles to overcome the elastic potential energy of the elastic rope. The greater the airflow velocity, the greater the rotation angle of the fan blades, which will increase the opening angle of the V-shaped connection end, and the expanded area of ​​each W-shaped filter screen will increase, thereby increasing the filtration efficiency of the foldable filter screen. When the airflow velocity decreases or there is no airflow, the wound and stretched elastic rope will drive the winding reel to rotate in the opposite direction, reducing the opening angle of the V-shaped connection end and folding the foldable filter screen, so that the device can automatically adjust the filtration efficiency of the foldable filter screen according to the airflow velocity in the air duct housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the rear structure of the present invention;

[0025] Figure 3 It is a side view of the present invention;

[0026] Figure 4 This is a side view of the internal structure of the air duct housing of the present invention;

[0027] Figure 5 This is an enlarged view of the structure at point A in the side view of the present invention;

[0028] Figure 6 This is a schematic diagram of the front structure of the slide rail frame of the present invention;

[0029] Figure 7 This is a schematic diagram of the rear structure of the slide rail frame of the present invention;

[0030] Figure 8 This is a structural diagram of the winding reel of the present invention;

[0031] Figure 9 Schematic diagram of the overall structure of the biological safety cabinet.

[0032] Figure numerals: 100, air duct housing; 110, foldable filter; 111, W-type filter; 120, connecting plate; 130, biological safety cabinet; 140, ventilation duct; 200, V-shaped connecting end; 210, wedge block; 300, slide rail frame; 310, sliding block one; 400, connecting block; 410, screw; 420, sliding block two; 430, N-type connecting rod; 500, bevel gear one; 510, protective plate; 600, connecting frame one; 601, rotating shaft three; 610, bevel gear four; 700, support rod; 710, rotating shaft one; 720, fan blade; 730, bevel gear two; 800, connecting frame two; 810, fixed block; 820, rotating shaft two; 830, bevel gear three; 900, winding reel; 910, fixed rod; 920, elastic rope. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments and drawings. However, the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without making any creative work are all within the scope of protection of the present invention.

[0034] Specific embodiments of the present invention are described below with reference to the accompanying drawings.

[0035] Example 1

[0036] As attached Figures 1-9 The air flow filtering device of a biological safety cabinet shown in the figure includes an air duct housing 100, which is installed in a ventilation duct 140 on a biological safety cabinet 130. The air duct housing 100 is a shell that is through-through from front to back. A foldable filter screen 110 is arranged inside the air duct housing 100. Connecting plates 120 are fixedly installed on the left and right sides of the outer wall of the foldable filter screen 110. The inner wall of the air duct housing 100 and the foldable filter screen 110 are fixedly connected by the connecting plates 120. The foldable filter screen 110 is formed by connecting a plurality of W-shaped filter screens 111. A V-shaped connecting end 200 is provided at the connection between two adjacent W-shaped filter screens 111 on the left and right. A wedge block 210 is provided on the inner side of the V-shaped connecting end 200 on the left and right sides. The wedge block 210 and the inner side wall of the V-shaped connecting end 200 fit together, and the wedge block 210 drives the V-shaped connecting end 200 on the left and right sides to move left and right.

[0037] Among them: when the wedge blocks 210 on the left and right sides move relative to each other, they can drive the V-shaped connecting ends 200 in contact with them to move relative to each other, so that the angle of the V-shaped connecting ends 200 changes, thereby expanding or contracting each W-shaped filter 111, and then changing the projected area of ​​the airflow flowing in each W-shaped filter 111 and the air duct housing 100, thereby adjusting the filtering efficiency of the foldable filter 110.

[0038] Example 2

[0039] Based on the first embodiment, the solution in the first embodiment is further detailed in combination with the following specific working methods, as described below:

[0040] As attached Figures 1-8The figure shows an air flow filter device for a biological safety cabinet, wherein the lower ends of the outer walls of the two wedge-shaped blocks 210 are fixedly mounted with sliding blocks 1 310, the lower ends of the left and right inner walls of the air duct housing 100 are fixedly mounted with connecting blocks 400, and the opposite sides of the inner walls of the left and right connecting blocks 400 are fixedly mounted with slide rail frames 300, and the two sliding blocks 1 310 are slidably connected to the inner walls of the slide rail frames 300, and the inner walls of the left and right connecting blocks 400 are rotatably connected with screws 410 located at the rear end of the slide rail frames 300, and the threads on the left and right sides of the screws 410 are opposite, and the outer walls of the screws 410 are symmetrically threaded with sliding blocks 2 420, and the two The lower end of the outer wall of each sliding block 420 is fixedly installed with an n-type connecting rod 430, and the front end of each n-type connecting rod 430 is fixedly connected to the lower end of the outer wall of the sliding block 1 310 on the corresponding side. A bevel gear 500 is fixedly installed in the middle of the outer wall of the screw 410. A protective plate 510 is symmetrically fixedly installed on the outer wall of the screw 410 and located on the left and right sides of the bevel gear 500. A connecting frame 600 is fixedly installed on the inner wall of the left and right connecting blocks 400 and located at the rear end of the screw 410. The upper end of the outer wall of the connecting frame 600 is fixedly installed by a support rod 700, and the upper end of the outer wall of the support rod 700 is rotatably connected to a rotating shaft 710. The front section of the outer wall of the rotating shaft 710 passes through the rear side of the outer wall of the support rod 700 and is fixedly installed with a fan blade 720. The rear end of the outer wall of the fan blade 720 is fixedly installed with a bevel gear 2 730. The upper end of the outer wall of the connecting frame 600 is symmetrically fixed with the connecting frame 2 800 on both sides. The upper ends of the outer walls of the two connecting frames 800 are fixedly installed with a fixed block 810 at the same time. The fixed block 810 is internally connected to the rotating shaft 2 820 for rotation. The upper and lower ends of the outer wall of the rotating shaft 2 820 are fixedly installed with a bevel gear 3 830. The internal connection of the connecting frame 600 is connected to the rotating shaft 3 601. The front and rear ends of the outer wall of the rotating shaft 3 601 are fixedly installed. There is a bevel gear four 610, and the bevel gear four 610 on the front and rear sides are respectively meshed with the bevel gear one 500 and the bevel gear three 830. A winding drum 900 is fixedly installed on the front section of the outer wall of the rotating shaft one 710, and an elastic rope 920 is wound around the inner wall of the winding drum 900. The number of elastic ropes 920 can be changed according to the rated wind speed of the air duct shell 100 and the model of the fan blade 720. The elastic rope 920 can be an elastic rubber rope or a cow tendon rope. A fixing rod 910 is fixedly installed on the end of the elastic rope 920 away from the winding drum 900, and the front end of the outer wall of the fixing rod 910 is fixedly connected to the rear end of the outer wall of the air duct shell 100.

[0041] Among them: When the flow airflow in the air duct housing 100 passes through, it can drive the fan blade 720 to rotate. When the fan blade 720 rotates, it can drive the rotating shaft 1 710 and the bevel gear 2 730 to rotate, so that the bevel gear 2 730 drives the rotating shaft 2 820 and the bevel gear 3 830 to rotate, thereby making the bevel gear 3 830 drive the bevel gear 4 610 and the rotating shaft 3 601 to rotate. When the bevel gear 4 610 rotates, it can drive the bevel gear 1 500 to rotate, and finally make the bevel gear 1 500 rotate, so that the screw 4 10 rotates, the screw 410 drives the two sliding blocks 2 420 thereon to make relative motion, and can move away from or approach each other at the same time. At the same time, when the two sliding blocks 2 420 move, they can respectively drive the two sliding blocks 1 310 to slide on the inner wall of the slide rail frame 300 through the N-shaped connecting rod 430, so that the two wedge blocks 210 move relative to each other, so that the device can use the flow airflow in the air duct housing 100 as a driving force to drive the two wedge blocks 210 to move relative to each other, so that when there is flow air passing through the device, each W-shaped filter 111 can be automatically unfolded. At the same time, when there is airflow passing through the air duct housing 100 to rotate the fan blades 720, the fan blades 720 can drive the winding drum 900 to rotate when rotating, and the winding drum 900 can wrap and stretch the elastic rope 920 when rotating. Different airflow velocities in the air duct housing 100 will cause the fan blades 720 to overcome the elastic potential energy of the elastic rope 920 and do work, and the rotation angles are different. The greater the airflow velocity, the greater the rotation angle of the fan blades 720. The larger the opening angle of the V-shaped connecting end 200, the larger the expanded area of ​​each W-shaped filter 111, thereby increasing the filtering efficiency of the foldable filter 110. When the airflow velocity decreases or there is no airflow, the wound and stretched elastic rope 920 will drive the winding reel 900 to rotate in the opposite direction, reducing the opening angle of the V-shaped connecting end 200 and retracting the foldable filter 110, allowing the device to automatically adjust the filtering efficiency of the foldable filter 110 according to the airflow velocity in the air duct housing 100.

[0042] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A biosafety cabinet airflow filter device, comprising an air duct housing (100), characterized in that: Foldable filters (110) are fixedly mounted on the left and right sides of the inner wall of the air duct housing (100). The foldable filters (110) are formed by connecting a plurality of W-shaped filters (111). A V-shaped connecting end (200) is provided at the connection between two adjacent W-shaped filters (111). Wedge-shaped blocks (210) are provided inside the V-shaped connecting ends (200) on the left and right sides. The wedge-shaped blocks (210) drive the V-shaped connecting ends (200) on the left and right sides to move left and right. The lower ends of the outer walls of the two wedge-shaped blocks (210) are fixedly mounted with a sliding block (310), the lower ends of the left and right inner walls of the air duct housing (100) are fixedly mounted with a connecting block (400), and the opposite sides of the inner walls of the left and right connecting blocks (400) are fixedly mounted with a slide rail frame (300), and the two sliding blocks (310) are slidably connected to the inner wall of the slide rail frame (300); The inner walls of the left and right connecting blocks (400) are rotatably connected to the rear end of the slide rail frame (300) with screw rods (410), the thread directions of the left and right sides of the screw rods (410) are opposite, the outer wall of the screw rods (410) is symmetrically threadedly connected to the sliding block 2 (420), and the lower ends of the outer walls of the two sliding blocks 2 (420) are fixedly installed with n-type connecting rods (430), and the front end of each n-type connecting rod (430) is fixedly connected to the lower end of the outer wall of the sliding block 1 (310) on the corresponding side; A bevel gear 1 (500) is fixedly mounted on the middle portion of the outer wall of the screw (410); The inner walls of the left and right connecting blocks (400) are fixedly mounted with a connecting frame (600) at the rear end of the screw rod (410). The upper end of the outer wall of the connecting frame (600) is fixedly mounted with a support rod (700). The upper end of the outer wall of the support rod (700) is rotatably connected with a rotating shaft (710). The front section of the outer wall of the rotating shaft (710) passes through the rear side of the outer wall of the support rod (700) and is fixedly mounted with a fan blade (720). The rear end of the outer wall of the fan blade (720) is fixedly mounted with a bevel gear (730). The upper end of the outer wall of the connecting frame (600) is symmetrically fixed with connecting gears (730). Frame 2 (800), the upper ends of the outer walls of the two connecting frames 2 (800) are fixedly installed with fixed blocks (810), the fixed blocks (810) are internally rotatably connected to the rotating shaft 2 (820), the upper and lower ends of the outer wall of the rotating shaft 2 (820) are fixedly installed with bevel gear 3 (830), the connecting frame 1 (600) is internally rotatably connected to the rotating shaft 3 (601), the front and rear ends of the outer wall of the rotating shaft 3 (601) are fixedly installed with bevel gear 4 (610), and the bevel gear 4 (610) on the front and rear sides are respectively meshed with the bevel gear 1 (500) and the bevel gear 3 (830).

2. The airflow filter device for a biological safety cabinet according to claim 1, characterized in that: Protective plates (510) are symmetrically fixedly mounted on the outer wall of the screw (410) and located on the left and right sides of the bevel gear (500).

3. The airflow filter device for a biological safety cabinet according to claim 2, characterized in that: A winding drum (900) is fixedly mounted on the front section of the outer wall of the rotating shaft (710), an elastic rope (920) is wound around the inner wall of the winding drum (900), a fixing rod (910) is fixedly mounted on one end of the elastic rope (920) away from the winding drum (900), and the front end of the outer wall of the fixing rod (910) is fixedly connected to the rear end of the outer wall of the air duct housing (100).

4. The airflow filter device for a biological safety cabinet according to claim 3, characterized in that: Connecting plates (120) are fixedly mounted on the left and right sides of the outer wall of the foldable filter (110), and the connecting plates (120) are fixedly connected to the inner wall of the air duct housing (100).

5. An airflow filtration method for the airflow filtration device of a biological safety cabinet according to claim 4, characterized in that: The specific steps are as follows: S1, a flowing airflow enters the air duct housing (100), and the flowing airflow drives the fan blades (720) to rotate; S2. When the fan blade (720) rotates, it can drive the rotating shaft 1 (710), the bevel gear 2 (730), the rotating shaft 2 (820), the bevel gear 3 (830), the bevel gear 4 (610) and the rotating shaft 3 (601) to rotate. When the bevel gear 4 (610) rotates, it can drive the bevel gear 1 (500) to rotate, and finally make the bevel gear 1 (500) rotate, so that the screw (410) rotates, and the screw (410) drives the two sliding blocks 2 (420) thereon to move relative to each other; S3, when the two sliding blocks (420) move, they can respectively drive the two sliding blocks (310) to slide on the inner wall of the slide rail frame (300) through the N-shaped connecting rod (430), so that the two wedge blocks (210) move relative to each other; S4. The fan blade (720) can drive the winding drum (900) to rotate when rotating, and the winding drum (900) can wind and stretch the elastic rope (920) when rotating. When the air flow rate decreases or there is no air flow, the wound and stretched elastic rope (920) will drive the winding drum (900) to rotate in the opposite direction, so that the opening angle of the V-shaped connecting end (200) is reduced, and the foldable filter (110) is folded up.

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